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Icom IC-746 Pro User Manual

1. memory channels and returns programmed values ee CLEARS all programmed contents in in set mode to default values Initial settings After resetting the transceiver set controls and CW Clockwise switches as shown in the figure below CCW Counterclockwise NR Max CCW NOTCH Max CCW HF VHF TRANSCEIVER N toea ea S M CH TWIN PBT I fcom 1c 74 sPRO NR JOTCH TRANSMIT OFF phones S LY NR YNOTCH O e i LOCK CO NN ELEC KEY AF RF SQL RIT ATX CLEAR AF Max CCW RIT ATX yy Y Ft JL J J Z e D MoN RF PWR CW TCH_ KEY SPEED NXP ATT NB VOX BK IN MONITOR CALL A CW PITCH 12 o clock KEY SPEED Max CCW RF SQL 12 o clock MIC GAIN Max CCW RF PWR Max CCW 18 3 BASIC OPERATION E Selecting an operating band The transceiver has a triple band stacking register Band keys This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized See the table below for a list of the bands available and the default settings for each register Using the band stacking registers
2. OOO0oo00 2 3 SWR EEEEHE U LI HOLO aortas 2t gereereeeeeeecee OO The best match is in this range E a Push F3 Push F5 to select SWR measuring step Push F1 to start measuring Push F3 to select number of SWR measuring steps e Measuring after pushing F1 Frequency marker appears and moves after meas urement When mesurement point s is are set outside of the oper atable frequency band the frequency marker flashes E E E DA e 4 E T E IT H H H H H H EARE EEEE E ENEE En a Typical display SWR varying between 1 and 2 full scale up to SWR 4 0 1 MEMORY OPERATION One frequency and one mode One frequency and one mode in each memory channel as scan Yes Yes No edges for programmed scan E Memory channel selection In VFO mode 1 Push V M to select VFO mode if necessary then rotate M CH to select a memory channel number e All memory channels including blank channels can be selected e BLANK appears when no information has been pro grammed into a memory channel 2 Push V M to select memory mode e MEMO and contents of the memory channel appear In memory mode 1 Push V M to select memory mode 2 Rotate M CH to select a memo
3. MENU Tuning dial V M gerorsesrocsereee i Be of pere Push F1 to start cancel the scanning Push F3 to switch between memory scan and select memory scan NNN NAAN ANAN 1 I dul FU Pfs GR mm Soot M ha ghas N AN N N NN pe e r e Scan menu Push F3 to set cancel as a select channel Select memory inidcator e Memory name screen Push F3 to set cancel as a select channel 72 73 8 SCANS E AF scan operation and Fine AF scan AF scan searches for signals within the specified range with the displayed VFO or memory channel fre quency as for center frequency The frequency range is specified by the span 1 Push V M to select VFO mode or memory mode as desired 2 Set center frequency of the AF scan 3 Push MENU to select ft 4 Push F1 to select the scan menu e See p 69 for scan condition elf the RF SQL control function is set as AUTO the squelch is always open in SSB CW and RTTY modes 5 Set the AF span by pushing F4 SE e 5 kHz 10kHz 20kHz 50 kHz 100 kHz 500 kHz and 1 MHz are selectable 6 Push F2 if to start the AF scan e Decimal points blink while scanning 7 When the scan detects a signal the scan stops pauses or ignores it depending on the VSC resume setting and the squelch condition Push F2 lt 3 to cancel the AF scan
4. CI CA SEI a he CJC CD CO om V V BASIC OPERATION 3 E Squelch and receive RF sensitivity Adjusts the RF gain and squelch threshold level The RF SQL control squelch removes noise output from the speaker closed position when no signal is received e The squelch is particularly effective for FM It is also avail able for other modes e The control can be set as the RF gain control only squelch is fixed open or squelch control RF gain is fixed at maxi mum in set mode p 82 See below right eThe 11 to 12 o clock position is recommended for any set ting of the RF SQL control SET MODE OPERATION eWhen setting as RF gain squelch control l Noise squelch FM mode Can be used in all modes ise squelch RF SQL Functions as noise squelch or S meter p EEEE E N default squelch in AM and FM S meter Squelch ne lt Ich only in oth d open E squelch only in other modes lt 7S Maximum SRF gain Operates as a squelch control SQL ma oe e RF gain is fixed at max sensitivity RF gain adjustable range S meter squelch Operates as an RF gain control in SSB CW and RTTY e Squelch is fixed open Operates as a squelch control in AM and FM e RF gain is fixed at max sensitivity eWhen functioning as RF gai
5. d Filters continued PBT operation example On the fly adjustment Once the adjustments have TWIN PBT control been made in the filter set mode you can make on the fly changes by using the Twin Pass Band Tuning e 7 SOOS a Twin PBT You will be able to see the effects of the Sools Twin PBT on the upper left hand side of the screen 2 A ee O oo OSEN ED CME E gt Y AO LSBUSBCW RTTY RAMFM a SSS SS a a YYYY O li e i i jti coi F eee oe ion nog iC LI CI A SH RIT ATX PBTC w ENA VEDS i Ta 1 r i izi izj VEO8 ri a z VOX GIBK IN P AMPATT AGC OFF SPLIT DUP EYNOTC4 FILTER Si COMP MONI QA GEOB Nege DTCS TSQL NR DAB a ee Mel bn i be is FILTER Passband width and shifting value are Isplayed tor selected titer indicated while TWIN PBT is operated number indications dA E l j Appears when PBT is used NOTE The Twin PBT filters shift the two IF DSP e Filter set mode indication filters See Diagrams below and right This feature allows both an IF shift as well as a narrowing of the Pass Band Although you can narrow the pass band by shifting the two filters this does not nar C J F F p F F row both filters thus the filter shape is not nar rowed You may hear some signal artifacts pass Shows the selected filter and passband width through this filter adjustment WWW e Indication while PBT setting 22 es oe Appears when passband is
6. C appears E Programming the call channel The call channel is programmed in the same way reg MW ular memory channels are It s convenient to program a most often used frequency into the call channel for quick recall As with memory channels the call chan nel can also hold split frequencies 1 Rotate M CH to select the call channel e C appears 2 Select the desired frequency and operating mode to program into the call channel 3 Push MW for 1 sec to program the displayed fre V M M CH quency and operating mode into the call channel e3 beeps are emitted when memory programming is suc cessful IMPORTANT When the call channel is selected with the CALL switch the frequency CANNOT be changed using the tuning dial band keys or keypad input However when the call channel is selected using M CH in memory mode the frequency CAN be changed MEMORY OPERATION E Frequency transferring The contents of a memory channel frequency oper a ating mode etc can be transferred to the VFO TR E Frequency transferring can be performed in either VFO opea mode or memory mode a OSS Q Transferring in VFO mode eoeeeanaeaea This is useful for transferring programmed contents to VFO
7. 060 ee ee a MENU renee 3 Tuning dial OPTION INSTALLATION 12 EE E Opening the transceiver s case Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units etc CAUTION DISCONNECT the DC power cable from the transceiver before performing any work on the transceiver Otherwise there is danger of elec tric shock and or equipment damage 1 Remove the 2 screws from the left side of the trans ceiver to remove the carrying handle as shown at SV q right 2 Remove the 6 screws from the top of the trans B n ceiver and the 6 screws from the sides then lift up as ESS aa SSE the top cover T 4 3 Turn the transceiver upside down K 4 Remove 6 screws from the bottom of the trans dH I ceiver then lift up the bottom cover WE UT 102 vOICE SYNTHESIZER UNIT The UT 102 announces the accessed readout s fre quency mode etc S meter level can also be an nounced p 85 in a clear electronically generated voice in English or Japanese Push LOCK SPCH for 1 sec to announce the fre quency etc 1 Remove the top and bottom covers as shown Sf above O 2 Remove the protective paper attached to the bot K tom of the UT 102 to expose the adhesive strip 3 Plug U
8. RIT ATX CLEAR RIT ATX AF Max CCW RF SQL 12 o clock ee Ge MIC GAIN Max CCW Bun RF PWR Max CCW D DOAO CO O O wee RF PWR CW TCH KEYSPEED VOX BK IN MONITOR CW PITCH 12 o clock KEY SPEED Max CCW 1 Setting up your transmit audio The 32 bit DSP in your IC 746PRO is capable of al lowing you to selects transmit audio for phone modes 2 Mic Gain The microphone gain is used for proper transmit audio level for full output power 3 DSP TX Audio Pass Band The capability of changing the pass band of your transmit audio is at your finger tips Regardless of the condition of the speech compressor you can adjust it by selecting the F4 TF You will find this located in the fii menu By pushing F4 Ti for 1 sec you can select the TX audio band pass There are three levels of audio passband width avail able Wide Mid and Nar TX Audio Passband widths Wide 2 8kHz Great Full Audio Mid 2 4kHz Great for operators with deep full voices Great for breaking through pile ups Nar 2 2 KHz 4 Microphone Equalizer Although these bandwidths are fixed the Microphone Tone Control will give you more audio control for your voice operation on SSB AM and FM modes Your IC 746PRO is equipped with a very powerful equalizer system with 121 possible combinations
9. TUNER Long wire or optional AH 2b Ground Control cable DATA COMMUNICATION 10 Hi E Connections E When connecting to DATA e When using a PC application eet aa a ce a 2 GND GND Connect to serial port parallel DATA OUT 9600 bps RX AUDIO port speaker jack microphone per jack and line IN OUT jack etc P SQL ______ See the instruction manual of the 5 AF OUT 1200 bps application for details PTTP e When using a TNC DATA IN O O TX AUDIO 2 GND GND O O COI M IO C DATA OUT 9600 bps RX AUDIO p gt 5 5 aas P SQL AF OUT 1200 bps DPT P gt When connecting the squelch line consult the necessary manual TNC etc E When connecting to ACC 1 e When using a PC application RTTY _ RTTY OUTPUT Connect to serial port parallel port speaker jack microphone ND aN j ne jack and line IN OUT jack etc AF AUDIO INPUT See the instruction manual of the PTT Soal KOS SEND _ application for details TNC or scan converter e When using a TNC RTTY OUTPUT AUDIO INPUT CO reeees PTT Rear panel view E When connecting to MIC e When using a PC application MIC INPUT AUD
10. 3 conductor 6 35 d mm 1 4 Phono RCA Phono RCA SPECIFICATIONS 15 E e Receiver e Receive system Triple conversion superheterodyne system e Intermediate frequencies 1st 64 455 MHz 2nd 455 kHz 3rd 36 kHz e Sensitivity typical SSB CW RTTY 0 16 uV 1 80 29 99 MHz 0 13 uV 50 MHz 0 11 uV 144 MHz 13 uV 0 5 1 799 MHz 2 uV 1 80 29 99 MHz 1 uV 50 144 MHz 0 5 uV 28 0 29 99 MHz 0 25 uV 50 MHz 0 18 uV 144 MHz Pre amp 1 is ON Pre amp 2 is ON Pre amp is ON eSquelch sensitivity Pre amp OFF 10 dB S N AM 10 dB S N FM 12 dB SINAD SSB CW RTTY Less than 5 6 uV FM Less than 1 0 uV e Selectivity More than 2 4 kHz 6 dB Less than 3 6 kHz 60 dB More than 500 Hz 6 dB Less than 700 Hz 60 dB More than 360 Hz 6 dB Less than 650 Hz 60 dB More than 6 0 kHz 6 dB Less than 15 0 kKHz 60 dB More than 12 0 kHz 6 dB Less than 20 0 kHz 60 dB e Spurious and image rejection ratio SSB BW 2 4 kHz CW BW 500 Hz RTTY BW 350 Hz AM BW 6 kHz FM BW 15 kHz HF 50 MHz More than 70 dB except IF through on 50 MHz band 144 MHz More than 60 dB More than 2 0 W at 10 distortion with an 8 Q load 9 99 kHz 3 conductor 6 35 d mm 14 2 conductor 3 5 d mm 8Q e AF output power at 13 8 V DC e RIT variable range e PHONES connector e Ext SP connector e Antenna tuner e Matching impedance range
11. NOTCH appears when automatic notch is selected NOTCH CONTROL NOTCH outer control p 53 Adjusts the notch filter frequency to remove an in terfering signal NR NOTCH Low frequency OP High frequency ANTENNA SELECTOR SWITCH ANT p 75 Switches the antenna connector selection between ANT1 and ANT2 when pushed NOISE REDUCTION LEVEL CONTROL NR inner control p 53 Adjusts the noise reduction level when the noise re duction is in use Set for maximum readability NR NOTCH Decreases KAF OFF ANTENNA TUNER SWITCH TUNER pgs 76 77 Turns the antenna tuner ON and OFF bypass when pushed momentarily Starts to tune the antenna manually when pushed for 1 sec eWhen the tuner cannot tune the antenna the tuning circuit is bypassed automatically after 20 sec NOISE REDUCTION SWITCH NR p 53 Switches the noise reduction ON and OFF e NR appears while the noise reduction is activated 1 PANEL DESCRIPTION E Front panel continued HF VHF TRANSCEIVER TWIN PBT I A X CLEAR 32 US re a he aD OIG D RIT ATX D oo LI I I I Da A E ag ete A A a Ve cee el tF PWR CW PITCH KEY SPE D P AMI ATT VOX K IN MON TOR T l 26 28 29 MULTI FUNCTION SWITCHE
12. e During sweep operation amp p appears and received Loe el eae ee signals cannot be heard i A elf there is a lot of signal noise turn the preamp OFF and Sweep start stop Sweep step selection the attenuator ON to reduce the signal input level and improve the readability of the band scope When rotating the tuning dial and you finding a sig nal you wish to communicate on then just commu nicate in the normal way elf you want to return to the previous frequency before rotating the tuning dial push F3 for 1 sec elf the selected frequency is set outside of the sweeped range sg or d flashes 6 While receiving if you want to update the band con ditions repeat steps 3 and as above Sweep indicator 47 E Preamp Attenuator The preamp amplifies received signals in the front end circuit to improve the S N ratio and sensitivity Set this to preamp 1 or preamp 2 when receiving weak signals The attenuator prevents a desired signal from distor tion when very strong signals are near the desired fre quency or when very strong electric fields such as from broadcasting stations are near your location These can both set independently for each band Push P AMP ATT several times to set the preamp OFF preamp 1 ON or preamp 2 ON eWhen the preamp is ON either RAMP or P AMP appears in the function display eWhen operating on the 144 MHz band the preamp can only be set to O
13. 2LO IN N MAINTENANCE 10 E E Troubleshooting The following chart is designed to help you correct lf you are unable to locate the cause of a problem or problems which are not equipment malfunctions solve it through the use of this chart contact your near est Icom Dealer or Service Center Power does not come on e Power cable is improperly connected e Re connect the DC power cable correctly when the POWER switch Fuse is blown e Check for the cause then replace the fuse with is pushed the spare one Fuses are installed in the DC power cable and the internal PA unit No sounds come out from Volume level is too low e Rotate AF clockwise to obtain a suitable lis the speaker tening level e The squelch is closed e Turn RF SQL to 10 o clock position to open the squelch e The transceiver is in transmitting condition e Push TRANSMIT to receive or check the SEND line of an external unit if desired Sensitivity is too low and e The antenna is not connected properly e Re connect to the antenna connector only strong signals are au e The antenna for another band is selected e Select an antenna suitable for the operating fre dible quency e The antenna is not properly tuned e Push TUNER for 1 sec to manually tune the antenna e The attenuator is activated e Push P AMP ATT for 1 sec to select ATT OFF Received audio is unclear Wrong operating mode is selected e Select a suitable oper
14. CONVENIENT e Direct shift frequency input The shift frequency can be entered directly Push F INP 2 Enter the desired shift frequency with the digit keys e1 kHz to 1 MHz can be set eWhen you require a minus shift direction push GENE e in advance 3 Push SPLIT e The shift frequency is input in the sub readout and the split function is turned ON Example To transmit on 1 kHz higher frequency Push F INP 1 8 1 then SPLIT To transmit on 3 kHz lower frequency Push F INP GENE 7 3 then SPLIT e Split lock function Accidentally releasing the XFC switch while rotating the tuning dial changes the receive frequency To pre vent this use both the split lock and dial lock func tions to change the transmit frequency only The split lock function cancels the dial lock function while pushing XFC during split frequency operation The dial lock s effectiveness during split frequency operation can be selected in the set mode for both receive and transmit frequencies or only the receive frequency p 83 SPLIT Lights during split operation XFC Tuning dial A B Shows transmit VFO B frequency Appears e While pushing XFC Po PE E 50 100 i ALC VFOB SWR R lt a aaan H pestare gereeeeeeeeeeeee oo P AMP AGC SPLIT FILTER Shows shift frequency and direction Shows transmit VFO B
15. e Rear panel ANTENNA 1 2 p 17 Connects a linear amplifier antenna selector etc AH 4 p 77 hen using the AH 4 it must be connected to the ANT1 C onnector SEND ALC p 17 Used for connecting a non lcom linear ampli fier DATA p 78 ACC SOCKETS pgs 8 78 REMOTE p 95 Used for computer control and transceive operation optional E Power supply connections Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power Refer to the diagrams below CONNECTING PS 125 DC POWER SUPPLY PS 125 Connect to an AC outlet using the supplied AC cable gt lt 1 1 DC power socket 2 INSTALLATION AND CONNECTIONS CAUTION Before connecting the DC power cable check the following important items Make sure e The POWER switch is OFF eOQutput voltage of the power source is 12 15 V when you use a non Icom power supply e DC power cable polarity is correct Red positive terminal Black negative terminal Transceiver w Uile i 00 0 DC power cable CONNECTING A DC POWER SUPPLY AC outlet A DC power supply 13 8 V at least 23 A Black Red AC cable 30 A fuses CONNECTING A VEHICLE BATTERY to DC power socket Supplied
16. Push 14 5 then select a frequency and an operat Example 14 MHz band ing mode eFrequency and operating mode are memorized in the first band stacking register 2 Push 14 5 again then select another frequency and operating mode e This frequency and operating mode are memorized in the second band stacking register 3 Push 14 5 again then select another frequency and operating mode e This frequency and operating mode are memorized in the third band stacking register eWhen a fourth frequency and operating mode are se lected on a band the first register set in step is over written N 7 IR BBL a E Selecting VFO memory mode VFO is an abbreviation of Variable Frequency Oscilla tor and is commonly referred to as a main tuning func tion The tuning dial is often called the VFO knob Push V M to switch between VFO and memory modes e Pushing V M for 1 sec transfers the contents of the se lected memory channel to VFO mode p 65 E VFO operation The transceiver has 2 VFOs and are called VFO A and VFO B You can use the desired VFO to call up a fre quency and operating mode for your operation Selecting the VFO A B Push A B to switch between the VFO A and VFO B e VFO A or VFO B appears VFO equalization Push A B for 1 sec to equalize the undisplayed VFO condition to the displayed VFO 3 beeps
17. e Rotating the tuning dial during scan also cancels scan operation About the Fine AF scan During AF scan when a signal is received scan con tinues but the tuning step is temporarily set to 10 Hz 1 Follow steps to above to start programmed scan 2 During AF scan push F3 E F to switch between AF scan and fine AF scan maon 3 Push F2 if to cancel the scan e Rotating the tuning dial during scan also cancels scan operation Keypad V M Push F1 a USM ee l Push F4 to select the span Push F2 to start cancel the scanning Zoo l PATRE Push F3 to switch between programmed scan and fine pro grammed scan A a SCANS E Tone scan DTCS code scan operation By monitoring a signal that is being operated with a re peater tone squelch or DICS you can determine the tone frequency necessary to open a repeater or the squelch Push AM FM to select FM mode 2 Push MENU several times to select 4 3 Push F4 TY for 1 sec to enter tone set mode 4 Push F1 Tr 4 to select the tone type to be scanned mety Tere for repeater tone Teli Terre for tone squelch and PES frwd for DTCS code can be selected eWhen selecting DTCS code to be scanned push F5 several times to select the DICS code polarity ir Normal polarity for transmit and reverse polarity for receive tid Reve
18. 192 8 173 8 196 6 177 3 199 5 179 9 203 5 183 5 206 5 Sol 06 s AM FM SPLIT A B M CH Auto repeater function This function automatically activates the repeater set tings DUP or DUP and or tone encoder ON OFF when the operating frequency falls within the general repeater output frequency range and deactivates them when outside of the range Set the auto repeater function ON 1 or ON 2 in set mode in advance p 84 When set ON 1 or ON 2 re peater settings are automatically activated according to the table below ON 1 automatically sets the duplex setting and ON 2 automatically sets the duplex setting and tone encoder automatically eFrequency range and offset direction FREQUENCY RANGE DUPLEX DIRECTION 146 610 146 995 MHz 147 000 147 395 MHz plus duplex RECEIVE AND TRANSMIT 4 46 Mm O FUNCTIONS FOR RECEIVE E Simple band scope The band scope function allows you to visually check signal conditions around a specified frequency The IC 746PRO s band scope function can be used in any op mam erating mode and frequency band Sweep indicator Band scope indicator Frequency indicator mark Sweep step indicator INDICATOR While the band scope is sweeping f i audio is not emitted from the speaker while the band scope is sweeping Indicates the relative streng
19. HF bands 16 7 to 150 Q unbalanced Less than VSWR 3 1 50 MHz band 20 to 125 Q unbalanced Less than VSWR 2 5 1 e Minimum operating input power 8 W HF bands 15 W 50 MHz band VSWR 1 5 1 or less Less than 1 0 dB after tuning e Tuning accuracy e Insertion loss All stated specifications are typical and subject to change without no tice or obligation 100 mm 16 options IC PW1 HF 50 MHz ALL BAND 1 kW LINEAR AMPLIFIER Full duty 1 kW linear amplifier including an automatic antenna tuner Has automatic tuning and band selection capability Full break in QSK oper ation is possible The amplifier oower supply unit and the remote control unit are separated AH 4 HF 50 MHz AUTOMATIC ANTENNA TUNER Specially designed to tune a long wire antenna for portable or mobile HF operation The PTT tuner start function provides simple operation e Input power rating 120 W SP 21 EXTERNAL SPEAKER Designed for base station opera tion e Input impedance 8 Q e Max input power 5 W AH 2b ANTENNA ELEMENT A 2 5 m long an tenna element for mobile operation with the AH 4 e Frequency coverage 7 54 MHz bands with the AH 4 CT 17 Cl V LEVEL CONVERTER For remote transceiver control using a personal computer You can change frequencies operating mode memory channels etc PS 125 DC POWER SUPPLY Light weight switching regulator system power supply e Output voltage 13 8 V DC e Max curre
20. The Triple Band Stacking Register will memorize the last three frequencies used in the band as well as the Mode Filter Tuner and AGC settings This makes band hoping much easier NR NOTCH aiaiai a aia a ani didina Noise reduction OFF Hint How far you advance the NR control will determine how much the noise can be effectively reduced Turning the control too far clockwise may cause some distortion to occur on the received signal The NR control should only be turned as far clockwise as is necessary Use this control along with RF gain NB noise blanker if needed and IF filters as well to minimize the effects of noise on the target signal VI QUICK REFERENCE GUIDE c Notch There are two notch systems on your IC 746PRO e Automatic The automatic notch will track up to three heterodynes This is helpful for eliminating annoying transmitter tune up tones on any band and to min imize continuous tone heterodynes encountered on the 40 meter phone bands at night for example Once selected an icon will appear NOTCH on the display Hint The Automatic Notch will not operate in the SSB data CW or RTTY modes EYNOTCH FILTER a e Manual The Manual notch provides 70 dB of atten uation to pin point an interfering signal The 12 o clock position is on the operating freq
21. 03 Level data 06 Level data 07 Level data 08 Level data 09 Level data OA Level data OB Level data OC Level data OD Level data OE Level data OF Level data 01 02 11 12 13 Set AF scan span A1 5 kHz A2 10 kHz A3 20 kHz A4 50 kHz A5 100 kHz A6 500 kHz A7 1 MHz Set as non select channel Set as select channel Set scan resume OFF Set scan resume ON Turn the split function OFF Turn the split function ON Select simplex operation Select DUP operation Select DUP operation Select 10 Hz 1 Hz tuning step Select 100 Hz tuning step Select 1 kHz tuning step Select 5 kHz tuning step Select 9 kHz tuning step Select 10 kHz tuning step Select 12 5 kHz tuning step Select 20 kHz tuning step Select 25 kHz tuning step Select read attenuator O OFF 1 ON Select read antenna selection O ANT1 1 ANT2 Announce with voice synthesizer OO all data 01 frequency and S meter level 0O2 receive mode AF level setting O max CCW to 255 max CW RF level setting O max CCW to 255 11 o clock SQL level setting 0 11 o clock to 255 max CW NR level setting O min to 255 max Inside TWIN PBT setting or IF shift setting 0 max CCW 128 center 255 max CW Outside TWIN PBT setting O max CCW 128 center 255 max CW CW PITCH setting 0 300 Hz 128 600 Hz 255 900 Hz RF PWR setting O mini to 255 max MIC GAIN setting O mini to
22. 255 max KEY SPEED setting O slow to 255 fast NOTCH setting O low freq to 255 high freq COMP Level Delay setting 0 0 to 10 10 Break IN DELAY setting 20 2 0d to 130 13 0d Read squelch condition Read S meter level Read RF power meter Read SWR meter Read ALC meter Preamp O OFF 1 preamp 1 2 preamp 2 AGC selection O OFF 1 Slow 2 Mid 3 Fast Noise blanker O OFF 1 ON Noise reduction O OFF 1 ON Auto notch O OFF 1 ON Repeater tone O OFF 1 ON Tone squelch O OFF 1 ON Speech compressor O OFF 1 ON Monitor O OFF 1 ON VOX function O OFF 1 ON Break in O OFF 1 semi break in 2 full break in Manual notch O OFF 1 ON RTTY filter O OFF 1 ON DTCS O OFF 1 ON VSC O OFF 1 ZON Send read memory contents see p 97 for details Send read band stacking register contents see p 97 for details Send read memory keyer con tents see p 97 for details Send read the selected filter width 0 50 Hz to 40 31 3600 2700 Hz Send read the selected AGC time constant O OFF 1 0 1 0 3 sec to 13 6 0 8 0 sec Send read LCD contrast 0 0 to 255 100 Send read LCD backlight 0 0 to 255 100 Send read beep gain O min to 255 max Send read beep gain limit O OFF 1 ON Send read calibration marker O OFF 1 ON Send read confirmation beep O OFF 1 ON Send read band edge beep O OFF 1 ON Send read RF SQL control set O Auto 1 SQL 2 RF SQL Send read meter peak h
23. 6 Cissrmieti Sacra Selects the number of the decoder indication from 2 or 3 lines Set item up down E Operating AM 1 Push a band key to select the desired band 2 Push AM FM to select AM 3 Rotate AF to set audio to a comfortable listening level 4 Rotate the tuning dial to tune a desired signal S meter indicates received signal strength e The default tuning step for AM mode is 1 kHz this can be changed using the tuning step program mode p 21 5 Push TRANSMIT or PTT microphone to trans mit e The TX indicator lights red 6 Speak into the microphone at your normal voice level e Adjust MIC GAIN at this step if necessary T Push TRANSMIT or release PTT microphone to return to receive Convenient functions for receive e Preamp and attenuator p 48 Push P AMP ATT several times to set the pre amp OFF preamp 1 ON or preamp 2 ON PAMP P AMP or P AMP appears when the preamp 1 preamp 2 or preamp is set to ON respec tively depending on operating frequency band Push PAMP ATT for 1 sec to set the attenuator ON ePush P AMP ATT momentarily to turn the attenuator OFF e ATT appears when the attenuator is set to ON e Noise blanker p 51 Push NB to turn the noise blanker ON and OFF e NB appears when the noise blanker is set to ON e Push NB for 1 sec to enter noise blanker set mode e Noise reduction p 53 Push
24. Accepts the supplied or an optional microphone eSee p 101 for appropriate microphones e See p 12 for microphone connector information RF GAIN CONTROL SQUELCH CONTROL RF SQL outer control Adjusts the RF gain and squelch threshold level The squelch removes noise output from the speaker closed condition when no signal is received eThe squelch is particularly effective for FM It is also available for other modes 12 to 1 o clock position is recommended for any setting of the RF SQL control e The control can be set as Auto RF gain control in SSB CW and RTTY squelch control in AM and FM or squelch control RF gain is fixed at maximum in set mode as follows p 82 SET MODE SETTING O RF GAIN SQL RF GAIN SQL RF GAIN SQL RF GAIN SQL eWhen setting as RF gain squelch control Noise squelch FM mode Recommended level ae eS Maximum VO N RF gain 4 Squelch ao open RF gain _ adjustable range S meter squelch eWhen functioning as RF gain control Squelch is fixed open SSB CW RTTY only i Maximum RF gain Adjustable range Minimum RF gain Vi eWhen functioning as squelch control RF gain is fixed at maximum Noise squelch No se squelch FM mode threshold J S meter squelch FM mode threshold Squelch is S meter open squelch Shallow N Deep ZY While rotating the RF gain control noise may be Y heard This comes fr
25. Convenient functions for transmit e Speech compressor p 58 While f is selected with MENU push F3 ri to turn the speech compressor ON and OFF e COMP appears when the speech compressor is set to ON e VOX voice operated transmit p 55 Push VOX BK IN to turn the VOX function ON and OFF e VOX appears when the VOX function is set to ON weternte MIC GAIN AM FM Tuning dial Appears e Noise reduction p 53 Push NR to turn the noise reduction ON and OFF e Rotate NR control to adjust the noise reduction level e NR appears when the noise reduction is set to ON e Auto notch filter p 53 Push NOTCH to turn the auto or manual notch filter ON and OFF e Rotate NOTCH control to set the attenuating fre quency for manual notch operation e VSC voice squelch control p 54 While fi is selected with MENU push F5 i r to turn the VSC function ON and OFF e The VSC indicator appears when the voice squelch function is set to ON e Transmit quality monitor p 57 Push MONITOR to turn the monitor function ON and OFF e MONI appears when the monitor function is set to ON e Audio tone control p 89 While fi is selected with MENU push F4 rotate the tuning dial to adjust the audio tone Tone squelch operation Tone squelch operation is a method of communica tions using selective
26. ELEC KEY con nector on the front panel eELEC KEY BUG KEY and Straight key can be selected 8 PR LEAD Rieder This item allows you to set the microphone UP DN keys to be used as a paddle UP DN switches can be used for CW UP DN switches cannot be used for CW NOTE When 4P is selected the frequency and memory channel cannot be changed using the UP DN switches RECEIVE AND TRANSMIT 4 34 35 4 RECEIVE AND TRANSMIT E Operating RTTY FSK Before operating RTTY be sure to consult the manual that comes with your TNC 1 Push a band key to select the desired band 2 Push CW RTTY several times to select RTTY eAfter RTTY mode is selected push CW RTTY for 1 sec to toggle RT TY and RI TY R modes 3 Rotate AF to set audio to a comfortable listening level 4 Rotate the tuning dial to tune a desired signal S meter indicates received signal strength elf the received signal cannot be demodulated try select ing RTTY R mode Push TRANSMIT to set the transceiver to the transmit condition or transmit a SEND signal from your TNC e The TX indicator lights red e The Po meter indicates transmitted RTTY signal strength 6 Operate the connected PC or TNC TU to transmit RT TY FSK signals e Adjust MIC GAIN at this step if necessary 7 Push TRANSMIT to return to receive Convenient functions for receive e Preamp and attenuator p 48 Push P AMP ATT sev
27. F INP push POWER for 1 sec to turn power ON e The internal CPU is reset e The transceiver displays its initial VFO frequency when resetting is complete 3 Correct the set mode settings after resetting if de sired 4 NOTE Resetting CLEARS all programmed con 4 tents in memory channels and returns programmed 4 Nalues in set mode to default values E Frequency calibration approximate A very accurate frequency counter is required to cali brate the frequency of the transceiver However a rough check may be performed by receiving radio sta tion WWV or other standard frequency signals CAUTION Your transceiver has been thoroughly adjusted and checked at the factory before being shipped You should not calibrate frequencies ex cept for special reasons 1 Push SSB to select USB mode 2 Push PBTC for 1 sec to clear the PBT settings and make sure that the RIT ATX function is not ac tivated 3 Set the frequency to the standard frequency station minus 1 KHz eWhen receiving WWV 10 000 00 MHz as a standard frequency set the operating frequency for 9 999 00 MHz e Other standard frequencies can also be used 4 Push MENU several times to select fii or ft if necessary Push MENU for 1 sec to select the set mode screen use an a or ee several times to select the item Di Rotate the ace dial clockwise to turn the calibra tion marker ON e Side tone may be heard Adjust CA
28. and Selects memory keyer menu first default Selects keyer SEND menu first 35 Pesek ampem f Uemewgis mg This item sets the external keypad capability External keypad does not func tion default Fi Pushing one of external keypad switches transmits the desired keyer memory contents during CW mode operation For your information The diagram as at right shows the equivalent circuit of an external keypad and connects to pin 3 and pin 7 of the MIC connector p 12 4 7kQ t5 2 2kQ t5 1 5KQ t5 1 5kQ t5 E General set mode continued This item sets the data transfer rate 300 1200 4800 9600 19200 bps and Auto are available Auto baud rate default 300 bps 1200 bps 4800 bps wid 1 9600 bps 2 19200 bps When Auto is selected the baud rate is automati cally set according to the connected controller or re mote controller its own Icom standard address in hexadecimal code The IC 746PRO s address is 66h When 2 or more IC 746PRO s are connected to an optional CT 17 ci v LEVEL CONVERTER rotate the tun ing dial to select a different address for each IC 746PRO in the range 01h to 7Fh Transceive operation is possible with the IC 746PRO connected to other Icom HF transceivers or receivers Transceive ON default Transceive OFF When ON is selected changing the frequency op erating mode etc on the IC 746PRO automatically change
29. gt O LL UL o 636 2 ee ae A straight key can be used when the internal electronic keyer is turned OFF in keyer set 4 NOTE You will need to select the type of keyer you mode p 34 Y are using in the Keyer Set mode There are many 4 advanced CW functions in this set mode Until you 4 have a full understanding of these functions change only the items necessary QUICK REFERENCE GUIDE 3 Other convenient items Headphones External Speaker A 6 35 d mm 1 4 mono jack for operation without A 3 5 d mm mono jack for operation with an ex using the internal or external speakers Perfect for op ternal speaker Input impedance 8 Q Max input eration without disturbing others in the room power 5 W S3 JUUL JUUL amp EXTERNAL SPEAKER SP 21 optional WE Your first contact Now you should have your IC 746PRO installed in your shack and like a kid on his birthday you are probably excited to get on the air We would like to take you through a few basic operation steps to make your first On The Air an enjoyable experience Getting started 1 Before powering up your radio you may want to Resetting the CPU Although you have purchased
30. 9 10 12 5 20 or 25 kHz selectable for quick tuning Push SSB CW RTTY or AM FM to select the desired operation mode 2 Push TS momentarily to activate the quick tuning function e W appears 3 Push TS for 1 sec to enter the tuning step set mode 4 Rotate the tuning dial to select the desired tuning step 5 Push TS to exit the tuning step set mode 14 Tuning step function SSB data CW and RTTY only While operating in SSB data CW RTTY the function is available for critical tuning Dial rotation is reduced to 14 of normal when the 1 4 function is in use While fit is selected with MENU push F3 7 lt i to toggle the 1 4 function ON and OFF 14 indicator Auto tuning step function When rotating the tuning dial rapidly the tuning step automatically changes several times as selected Push MENU for 1 sec to enter the ti mos DF Push F14 or F2 to select the amp Babar ee item DF Rotate the ap ala to select the function ON I aor hi and pippe edt TE p A 5 times ae ei hi Approx 2 times faster eri Auto tuning step is turned OFF 4 Push MENU to exit the set mode Selecting the 1 Hz step The minimum tuning step of 1 Hz can be used for fine tuning 1 Push TS momentarily to turn the quick tuning step OFF e w disappears 2 Push TS
31. AMPATT AGC OFF SPLIT DUP GYNOTCH FILTER Q GMBNB DTCS TSQL NR gab Either W or B appears No indicator appears during 144 MHz operation AF 9 RF SQL Decreases A Increases Max audio output No audio output What are you hearing Stop and focus on what you are hearing Do you hear a lot of noise Is the signal intelligible Are you set up for the right mode How about the filters 1 Verify mode Although your IC 746PRO will automatically select USB or LSB in the HF bands it will not select any of the other modes You will need to select the proper mode whether CW RTTY AM or FM C Jon O oo OL Me a eS C OOOD es aian 2 Reducing interference Your IC 746PRO has many features to reduce QRM and QRN from the desired signal a Noise Reduction The noise reduction system on your IC 746PRO is part of the 32 bit DSP This is used to reduce the hiss and QRM levels To acti vate push the NR switch located just to the right of the PHONES jack NR NR P AMP AGC FILTER a M A Appears b Adjusting the Noise Reduction The noise re duction is completely variable on how much of the DSP Noise Reduction is used NR level control lo cated just above the NR switch QUICK REFERENCE GUIDE CW RTTY AM FM Hint
32. Bie yay This item turns the auto repeater function to ON 1 auto duplex setting ON 2 auto duplex setting and activating tone encoder or OFF See p 46 for details concerning the auto repeater function The internal antenna tuner has an automatic start ca pability which starts tuning if the SWR is higher than 1 5 3 1 in the HF bands When OFF is selected the tuner remains OFF even when the SWR is poor 1 5 3 1 When ON is se lected automatic tune starts even when the tuner is turned OFF be started automatically at the moment the PTT is pushed after the operating frequency is changed more than 1 from the last tuned frequency 21 iaioa iced This item turn the 9600 bps data transmission capa bility ON and OFF For 9600 bps data transmission For the regular audio or slower data transmission only SET MODE 11 84 85 11 SETMODE E General set mode continued You can set the antenna connector selection to auto matic manual or non selection when using 1 an tenna only for the HF 50 MHz bands The antenna switch is activated and the band memory memorizes the se lected antenna default ami The antenna switch is activated and selects an antenna manually The antenna switch is not activated and does not function The ANT1 con nector is always selected in this case When the optional UT 102 VOICE SYNTHESIZER UNIT IS installed you can select between Englis
33. DC power cable Transceiver NOTE Use terminals for the cable connections NEVER connect to a 24 V battery ar aa NEVER connect to a battery without supplied DC fuses otherwise a fire hazard may occur black Supplied DC power cable 2 INSTALLATION AND CONNECTIONS E Linear amplifier connections CONNECTING THE IC PW1 To an antenna ACC 1 INPUT1 Wy Mi ANN o 2 O 0 O W GND ee TST Se ee 6 IC PW1 AC outlet Non European versions 100 120 220 240 V European version 230 V ACC cable supplied with the IC PW1 Coaxial cable supplied with the IC PW1 Be sure to connect the cable to the 7 pin ACC 2 jack Ground Use the ANT1 connector when connecting a linear amplifier Remote control cable supplied with the IC PW1 e S WU O oo 004 Transceiver 4 Turn OFF the transceiver s antenna tuner while tuning the IC PW1 s tuner CONNECTING A NON ICOM LINEAR AMPLIFIER 50 Q coaxial cable To an i antenna ANTI Transceiver O O RF OUTPUT RF INPUT Non Icom linear amplifier E External antenna tuner connections CONNECTING THE AH 4 W he AH 4 must be connected to ANT1 Coaxial cable from AH 4 ANT1 Transceiver r A WARNING Set the tran
34. IF center frequency interference desired signal inteference desired signal 52 53 D FUNCTIONS FOR RECEIVE E Noise reduction The noise reduction function reduces noise compo nents and picks out desired signals which are buried in noise The received signals are converted to digital signals and then the desired signals are separated from the noise C Push the NR switch to turn the noise reduction ON e NR appears 2 Rotate the NR control to adjust the noise reduction level 3 Push the NR switch to turn the noise reduction OFF e NR disappears Y Deep rotation of the NR control results in audio sig Y nal masking or distortion Set the NR control for 4 maximum readability ON E Notch function This transceiver has auto and manual notch functions The auto notch function automatically attenuates more than 3 beat tones tuning signals etc even if they are moving The manual notch can be set to attenuate a frequency via the NOTCH control Push Z NOTCH to toggle the notch function be tween auto manual and OFF in SSB and AM modes Push Z NOTCH to turn the manual notch function ON and OFF in CW mode Push 9 NOTCH to turn the auto notch function ON and OFF in FM mode e Set to attenuate a frequency for manual notch via the NOTCH control G NOTCH appears when auto notch is in use e NOTCH appears when manual notch is in use heard This comes
35. MENU push F5 i pR to switch the VSC Voice Squelch Control function ON and OFF E a E VSC appears when the function is activated SSB AM and FM e The VSC function can also be used for scanning operation in AM or FM mode p 70 59 6 FUNCTIONS FOR TRANSMIT E VOX function The VOX Voice Operated Transmission function switches between transmit and receive with your voice This function provides an opportunity to input log en tries into your computer etc while operating e Using the VOX function 1 Select a phone mode SSB AM FM 2 Push VOX BK IN to turn the VOX function ON or OFF Adjusting the VOX function 1 Select a phone mode SSB AM FM 2 Push VOX BK IN to turn VOX function ON 3 Push VOX BK IN for 1 sec to enter VOX set mode 4 Select the i S4 yy item using F1 amp or F2 While n h into ine eefricto one rotate the tun ing dial to the point where the transceiver is contin uously transmitting Push F3 for 1 sec to Segel me shan value Push F2 to select ftryi i LIE item 7 While receiving rotate ine Surin dial to the point where the transceiver does not switch to transmit with the speaker output Push F3 for 1 sec to eo the default value Push F2 to select Lif es yg item 9 Adjust the VOX delay ior a convenient interval be fore returning to receive Select the VOX delay item using the tuning dial Push F3 t
36. MHz push F INP 1 8 1 10 4 GENE 1 8 1 28 9 14 5 144 ENT LCD FUNCTION DISPLAY See pgs 9 10 for details Shows the operating frequency function switch menus band scope screen memory name screen set mode settings etc 1 PANEL DESCRIPTION E Rear panel DC POWER SOCKET DC 13 8V pgs 14 16 Accepts 13 8 V DC through the supplied DC power cable OPC 025D OUG ggg Rear panel view ANTENNA CONNECTOR ANT 144MHz ANTENNA CONNECTOR 2 ANT2 ANTENNA CONNECTOR 1 ANT1 pgs 14 15 17 75 Accepts a 50 Q antenna with a PL 259 connector e ANT 144MHz for 144 MHz 2 m band only ANT1 and ANT2 for both HF and 50 MHz 6 m bands antennas Y When using an optional AH 4 HF 50 MHz AUTO Y MATIC ANTENNA TUNER connect it to the ANT 1 Y connector The internal antenna tuner activates Y for ANT2 and deactivates for ANT 1 when con necting the AH 4 DATA SOCKET DATA pgs 15 78 Connects a TNC Terminal Node Controller etc for data communications e See p 8 for connector information EXTERNAL SPEAKER JACK EXT SP pgs 15 101 Accepts a 4 8 Q speaker CI V REMOTE CONTROL JACK REMOTE p 95 Designed for use with a personal computer for re mote control of the transceiver functions Used for transceive operation with another Icom Cl V transceiver or receiver SEND CONTROL JACK SEND p 17 Goes to ground while transmitting to control ext
37. No of memory ch 102 99 regular 2 scan edges and 1 call SO 239x3 2 for HF 50 MHz and 1 for 144 MHz 50 Q 10 C to 60 C 14 F to 140 F Less than 7 ppm from 1 min to 60 min after power ON After that rate of stability is less than 1 ppm hr at 25 C 77 F Temperature fluctuations 0 C to 50 C 20 F to 122 F less than 5 ppm 1 Hz 13 8 V DC 15 negative ground e Antenna connector e Operating temp range e Frequency stability e Frequency resolution e Power supply e Power consumption Transmit Max power 23 0 A Receive Standby 2 2 A Max audio 3 0 A e Dimensions projections not incl e Weight approx e ACC 1 connector e ACC 2 connector e DATA connector eCl V connector 287 W x120 H x316 5 D mm 13 6 W x4 2 H x12 2 D in 9 0 kg 19 Ib 13 oz 8 pin DIN connector 7 pin DIN connector Mini DIN 6 pin 2 conductor 3 5 d mm 4 e Transmitter e Output power continuously adjustable SSB CW RTTY FM Less than 5 to 100 W AM Less than 5 to 40 W e Modulation system SSB PSN modulation AM Low power modulation FM Phase modulation 50 dB HF bands 60 dB 50 144 MHz e Spurious emission e Carrier suppression 40 dB e Unwanted sideband 55dB suppression e ATX variable range 9 99 kHz e Mic connector eELEC KEY connector e KEY connector e SEND connector e ALC connector 8 pin connector 600 Q 3 conductor 6 35 d mm 1 4
38. Shows the selected filter and passband width e Indication while setting Reverses Appears While pushing F1 E passband width i f rotate the tuning dial to set 5 50 51 D FUNCTIONS FOR RECEIVE E IF DSP filter shape The type of IF DSP filter shape for SSB and CW can be selected independently from soft and sharp Push SSB or CW RTTY to select SSB CW or RT TY mode 2 Select the filter set mode e Push FILTER for 1 sec e Operating mode can be selected in this step 3 Push FILTER several times to select the desired IF filter Push the IFS to select the filter shape from seger Push TMENU to exit the set mode E Noise blanker The noise blanker eliminates pulse type noise such as from car ignitions The noise blanker is not available for FM mode Push NB to turn the noise blanker ON NB indicator appears 2 Push NB for 1 sec to enter the NB level set mode 3 Rotate the tuning dial to adjust the noise blanker level e Noise blanker level is indicated with bar meter and digit in 4 Push NB to exit the noise blanker set mode 5 Push NB to turn the noise blanker OFF NB indicator disappears N Y When using the noise blanker received signals may Y be distorted if the noise blanker level setting has j been too high MOOK E Meter peak hold function The S meter has a peak level holding function The peak level of the received
39. This is achieved by using the separate bass and treble ad justments The default for both the Base and Treble is at O dB Entering Microphone Tone Control set mode 1 Push MENU several times or until f is shown on the display 2 Push F4 Ti 4 for the Tone Control set mode 3 Push the appropriate mode switch to adjust SSB AM or FM component 1 TE Bee This item adjusts the bass level of the transmit audio tone from 5 dB to 5 dB in 1 dB steps OTH T This item adjusts the treble level of the transmit audio tone from 5 dB to 5 dB in 1 dB steps Verify you have selected a clear frequency and call out your CQ QUICK REFERENCE GUIDE Push F4 J e MEA eo ee The selected transmit filter width is displayed for approx 1 sec Push F4 for 1 sec to select the transmit filter width Voice patterns and audio characteristics vary with each operator therefore the MIC GAIN DSP TX Audio Pass Band and Microphone Tone Control settings will be different for each operator Actual on air experimenting is necessary to get just the right sound Listen to your transmit audio with head phones and the monitor function turned ON It s also best to test and adjust your audio on the air while someone who knows what your real voice sounds like listens and provides and opinion on your audio quality MM PANEL
40. V M M CH Select VFO mode with V M TRANSFERRING EXAMPLE IN VFO MODE a memory channel to be transferred with een wae nes hats oy e BLANK appears if the selected memory channel is a blank channel In this case transferring is impossible 3 Push V M for 1 sec to transfer the frequency and operating mode e3 beeps are emitted Transferring in memory mode TRANSFERRING EXAMPLE IN MEMORY MODE ss Operating frequency 14 020 MHz CW M ch 16 This is useful for transferring frequency and operating Contents of M ch 16 14 018 MHz CW mode while operating in memory mode When you have changed the frequency or operat ing mode in the selected memory channel e Displayed frequency and mode are transferred e Programmed frequency and mode in the memory channel are not transferred and they remain in the memory channel 1 Select the memory channel to be transferred with M CH in memory mode e And set the frequency or operating mode if required 2 Push V M for 1 sec to transfer the frequency and operating mode 3 beeps are emitted when the transferring is successful e Displayed frequency and operating mode are transferred to the VFO 3 To return to VFO mode push V M momentarily Push V M for 1 sec then push V M E Programming scan edges Memory channels P1 and P2 are the program scan edges They are used to program an upper and lower frequency for programmed scan p 71 By default
41. calling Only received signals hav ing a matching tone will open the squelch Before communicating using tone squelch all members of your party must agree on the tone squelch frequency to use 1 Push AM FM to select FM mode 2 Push MENU several times to select fii 3 Push F4 Ti several times to turn the tone squelch function ON e TSQL appears 4 Push F4 Tr for 1 sec to enter tone frequency set mode Push F1 Tr several times until Tse T appears if necessary 6 Rotate the tuning dial to select the desired tone squelch frequency e Push F3 for 1 sec to select the default frequency 7 Push MENU to return to 44 Communicate in the usual manner e Available tone squelch frequencies Unit Hz 210 7 254 1 RECEIVE AND TRANSMIT eceerereanneereecee en ee ee ee we ew o Eee ee i Se ee Push F4 for 1 sec Lee Se a a 42 43 4 RECEIVE AND TRANSMIT DTCS operation DTCS function is an another method of communica tions using selective calling Only received signals hav ing a matching 3 digit code will open the squelch 1 Push AM FM to select FM mode 2 Push MENU several times to select fii 3 Push F4 Tr several times to turn the DTCS function ON e DTCS appears 4 Push F4 te for 1 sec to enter tone frequency set mode 5 Push F1 TE several times until PPC Creede appears if necessary 6 Rotate the tuning dial to
42. distorted Repeater cannot be ac e Split frequency or duplex function is not acti e Push SPLIT and or F2 f to turn pgs 44 cessed the function ON 59 e Programmed subaudible tone frequency is Reset the frequency using set mode p 45 Programmed scan does Squelch is open e Set RF SQL to the threshold point p 24 not stop RF SQL is assigned to RF gain control and Reset RF SQL control assignment and set it to pgs squelch is open the threshold point Programmed scan does The same frequencies have been programmed Program different frequencies in scan edge not start in scan edge memory channels P1 and P2 memory channel P1 and P2 Memory scan does not 2 or more memory channels have not been Program more than 2 memory channels start programmed Select memory scan does 2 or more memory channels have not been Designate more than 2 memory channels as se p 72 not start designated as select channels lect channels for the scan 13 MAINTENANCE The displayed frequency The dial lock function is activated does not change properly A set mode screen is selected mode e The internal CPU has malfunctioned e Reset the CPU E Fuse replacement If a fuse blows or the transceiver stops functioning try CAUTION DISCONNECT the DC power cable to find the source of the problem and replace the dam from the transceiver when changing a fuse aged fuse with a new r
43. filter o or B e The selected passband width and filter number is dis played in the LCD ZY By pushing PBTC the set filter passband width ZB and shifting value amp is indicated FUNCTIONS FOR RECEIVE The selected filter width is indicated for approx 1 sec when FILTER is pushed Filter selection Filter passband width setting SSB CW and RTTY mode only 1 Select SSB CW or RTTY mode ePassband widths for AM and FM modes are fixed and cannot be set 2 For RTTY mode turn OFF the RTTY filter 3 Push FILTER for 1 sec to enter filter set mode 4 Push FILTER several times to select the desired IF filter number While pushing F1 H i rotate the tuning dial to set the desired pe Ban width eIn SSB and CW modes the passband width can be set within the following range 50 to 500 Hz 50 Hz steps 600 to 3600 Hz 100 Hz steps eIn RTTY mode the passband width can be set within the following range 50 to 500 Hz 50 Hz steps 600 to 2700 Hz 100 Hz steps e Push F 3 for 1 sec to select the default value 6 Repeat steps to if desired 7 Push MENU to exit the filter set mode 4 The PBT shift frequencies are cleared when the f passband width is changed This filter set mode screen graphically displays the PBT shift frequencies and CW pitch operations e Filter set mode indication
44. for 1 sec to toggle the 1 Hz tuning step ON and OFF Band edge warning beep When selecting a frequency that lies outside of a band s specified frequency range a warning beep sounds This function can be turned OFF in set mode if de sired p 82 Frequency setting with the keypad The transceiver has a keypad for direct frequency entry as described below Push F INP e F INP indicator lights 2 Input the desired frequency e Input e decimal point between the MHz units and kHz units 3 Push 144 ENT to enter the input frequency e To cancel the input push A B instead of 144 ENT EXAMPLE 14 025 MHz Push 21 280 MHz 21 245 MHz Push USB BASIC OPERATION 1 Hz indicator Lights when keypad input is activated Keypad F INP 3 22 23 3 BASIC OPERATION E Operating mode selection SSB USB LSB SSB data USB data LSB data CW CW reverse CW R RTTY RTTY R RTTY reverse AM AM data FM and FM data modes are available in the IC 746PRO Select the desired operation mode as follows To select a mode of operation push the desired mode switch momentarily Push the switch again to toggle between USB and LSB CW CW R and RTTY RTTY R AM and FM if necessary Push the
45. from the DSP unit and does not Be operating the manual notch noise may be indicate an equipment malfunction E Dial lock function The dial lock function prevents accidental changes caused by the tuning dial Push LOCK SPCH to turn the dial lock function ON and OFF e LOCK indicator lights while the dial lock function is ac tivated NR NR Appears EYNOTCH FILTER a Notch function indicators Lights while the dial lock function is activated o EzE gt Q CUCUCIUC 5 oem cone oe onl ae GED es GED a Ge o E OG i L 4 aa O OOOO EO LOCK SPCH FUNCTIONS FOR RECEIVE 5 E Voice squelch control function This function is useful when you don t want unmodu VSC indicator lated signals When the voice squelch control function is activated the receiver checks received signals for voice components lf a receiver signal includes voice components and the tone of the voice components changes within 1 sec Pese MT E I squelch opens If the received signal includes no voice WR ag f cu components or the tone of the voice components does C FE o PAM AGC O OOA OFAR not change within 1 sec squelch closes e als A CALL BLANK w While ft is selected with
46. func tion switches F1 F5 O DSP FILTER INDICATOR p 50 Shows the selected IF filter MEMORY CHANNEL READOUTS p 62 Shows the selected memory channel SELECT MEMORY CHANNEL INDICATOR p 72 Appears when the selected memory channel is set as a select memory channel BLANK MEMORY INDICATOR p 62 Appears when the selected memory channel is blank 1 4 TUNING DIAL SPEED INDICATOR p 21 Appears when the tuning dial speed is set so that one rotation is equal to 1 4 of the normal rotation VOICE SQUELCH CONTROL INDICATOR p 54 Appears during VSC Voice Squelch Control func tion is activated MODE INDICATORS p 23 Shows the selected operating mode P appears when SSB data AM data or FM data mode is selected ANTENNA INDICATOR p 75 Indicates which antenna connector is used for HF 50 MHz ANTENNA TUNER INDICATORS pgs 76 77 gt TUNE appears when the antenna tuner is ON TUNE appears and flashes during tuning we EXT appears when the optional AH 4 external antenna tuner is connected to ANT 1 E LCD display continued BREAK IN INDICATORS p 56 3 BK IN appears when the full break in function is activated BK IN appears when the semi break in function is activated MONITOR INDICATOR p 57 Appears when the monitor function is activated PREAMP INDICATORS p 48 Appears when the preamp is activated A
47. signal strength is indicated for 0 5 sec approx This function can be deactivated in set mode if desired p 82 ee ee ee ee gt a Push F5 NB Shows noise blanker level Shows peak level for approx 0 5 sec E Twin PBT operation General PBT Passband Tuning function electronically narrows the IF passband width by shifting the IF fre quency to slightly outside of the IF filter passband to reject interference This transceiver uses the DSP cir cuit for the PBT function Moving both TWIN PBT controls to the same position shifts the IF The LCD shows the passband width and shift fre quency graphically Push FILTER for 1 sec to enter the filter set mode Current passband width and shift frequency is dis played in the filter set mode screen To set the TWIN PBT controls to the center posi tions push PBTC for 1 sec The variable range depends on the passband width and mode The edge of the variable range is half of the passband width and PBT is adjustable in 25 or 50 Hz steps These controls function as an IF shift control while in AM mode and when the RTTY filter is turned ON Only the inner control may function in this case IF shift is adjustable in 20 40 Hz steps in RTTY RI TY filter is turned ON or 150 300 500 Hz steps in AM e TWIN PBT should normally be set to the center positions PBT setting is clea
48. the squelch is open LOCK INDICATOR LOCK p 53 Lights when the dial lock function is activated Q D 38 QUICK TUNING SWITCH TS p 21 Turns the quick tuning step ON and OFF eWhile the quick tuning indicator is displayed the fre quency can be changed in programmed kHz steps 0 1 1 5 9 10 12 5 20 and 25 kHz quick tuning steps are available Quick tuning indicator EXT MY 2D USB q gt meumnnnrir 606 Lees LI Li While the quick tuning step is OFF turns the 1 Hz step ON and OFF when pushed for 1 sec e1 Hz indication appears and the frequency can be changed in 1 Hz steps While the quick tuning step is ON enters the quick tuning step set mode when pushed for 1 sec VFO SELECT SWITCH A B p 20 Push to toggle between VFO A and VFO B Push for 1 sec to equalize the frequency and op erating mode of the two VFO s SPLIT SWITCH SPLIT Turns the split function ON and OFF when pushed p 59 Turns the quick split function ON when pushed for 1 sec p 60 e The offset frequency is shifted from the displayed fre quency e The quick split function can be turned OFF using set mode p 83 Turns the split function ON and sets the transmit frequency after inputting an offset frequency with the keypad 4 MHz in 1 kHz steps p 59 PASSBAND TUNING CONTROLS TWIN PBT Adjust the receiver s passband width of the DS
49. to select ft 3 Push F1 H to select the scan menu e See p 69 for scan condition elf the RF SQL control function is set as AUTO the squelch is always open in SSB CW and RTTY modes 4 Push F1 HEE to start the memory scan e The MHz and kHz decimal points blink while scanning eAt least 2 memory channels must be programmed for memory scan to proceed To cancel the scan push F1 HEF e Rotating the tuning dial during scan also cancels scan operation E Select memory scan Select memory scan searches through memory chan nels set as select for signals See below for setting and deleting select memory channels 1 Follow the steps to above to start memory scan tween memory scan and select memory scan e At least 2 memory channels must be set as the select channel 3 Push F1 HE to cancel the scan e Rotating the tuning dial during scan also cancels scan operation Q Setting Cancelling select memory channels All memory channels except scan edges P1 and P2 can be set as a select memory channels set cancel the displayed memory channel as a se lect channel or while memory name screen is indi memory channel as a select memory channel e SEL appears when the channel is set as a select mem ory channel e SEL disappears when cancelled memory settings R E 7 S O coe ces ee Sc N DBD O S amp S 0 e ea
50. your IC 746PRO to your ground ing system the shortest most direct connection is rec ommended proper grounding techniques Check with your local NOTE There are many publications covering J U dealer for more information and recommendations 2 Installing your DC Power Supply The DC power supply is a device used to convert 110 220 V AC also know as Household current to a steady source of 13 8 V DC The perfect match to your IC 746PRO is the PS 125 This compact switching power supply is the matching power supply for your IC 746PRO with a current rat ing of 25 A continuous duty This plug and play unit plugs into the DC jack located on the rear of the radio Transceiver Cs Os UNH UL OO 9e LJ PS 125 DC power socket complete A WARNING NEVER ground station equip f G ment or antennas to house gas lines NEVER at tach ground lines to plastic pvc pipe Some Symptoms if inadequate grounding a Poor DC Ground 60 Hz hum on the audio either Rx or Tx without the antenna connected If you feel a tingling sensation when you touch a metal surface Surfaces such as the cover of your radio or power supply b Poor RF Ground While transmitting and you feel a tingling sensation when you touch a metal surface Surfaces such as the cover of your radio or power supply While transmitting you exp
51. z4 to turn the 1 4 function ON and OFF BRTTY functions The transceiver has a number of convenient functions for the RT TY operation that can be accessed from the RI TY menu RECEIVE AND TRANSMIT 1 Push CW RTTY to select RTTY mode 7 2 Push MENU to select f 7 3 Push F4 amp T4 to select the RTTY menu 4 Push one of the multi function keys F2 F4 or F5 to select an item in the RT TY menu See the oo Of X JUUL JOUL JUU 00000 UU nO OMY On 0U QO diagram below re e Push MENU to return to the previous indication 0 0 0 0 03 03 MENU CW RTTY QIN RTTY MODE perp ata nof F H x onan uD M a a Push F4 a m e RTTY menu a E F4 for 18sec ums ee E S Push F2 e RTTY decoder screen p 38 F5 ec a E E ea About RTTY reverse mode Received characters are occasionally garbled when the receive signal is reversed between MARK and Space This reversal can be caused by incorrect TNC connections setting commands etc To receive re versed RTTY signals correctly select RI TY R mode While RTTY mode is selected push CW RTTY Normal Reverse for 1 sec to select the RT TY reverse mode 170Hz 2125Hz I oy95Hz 170 Hz e RTTY R appears when the RTTY reverse mode is se i i lected l i e Push CW RTTY for 1 sec again to select the normal
52. 1 kHz can be selected Gee T RTTY filter indicator ALC Nun BEOCOOONEE lt lt _ gt Rotate the tuning dial to the point where both sides of the Push F4 dots appear equally ee ee ee Disappears when the RT TY filter is turned OFF RTTY decoder The transceiver has an RTTY decoder for Baudot mark freq 2125 Hz shift freq 170 Hz 45 bps An external terminal unit TU or terminal node con nector TNC is not necessary for receiving a Baudot signal Push CW RTTY to select RTTY mode e After RTTY mode is selected push CW RTTY for 1 sec to select RIT TY R mode 2 Push MENU several times to select fii 3 Push F4 t gt to select RTTY menu The RTTY decoder does not function when the RTTY fil ter is turned OFF e RTTY decoder screen appears 6 Push F2 to freeze the current screen appears while the function is in use 7 Push F3 for 1 sec to clear the displayed charac ters Push MENU to exit the RT TY decoder screen e Setting the decoder threshold level Adjust the RTTY decoder threshold level if some char acters are displayed when no signal is received Call up the RTTY decoder screen as described above condition 3 Rotate the tuning dial to adjust the RTTY decoder threshold level e Push F3 for 1 sec to select the default condition 4 Push MENU to exit the R
53. C allows you to monitor the operating frequency directly RIT is temporarily cancelled CLEAR 48 49 5 FUNCTIONS FOR RECEIVE a Medium AGC speed ae Slow AGC speed hha Fast AGC speed oe A OFF AGC is not activated eooceee nn eeececeee mm ee eo ee wo ew ew o Push F1 for 1 sec Appears under the selected AGC Selected mode speed s time constant indication e When AGC fast is selected Push F2 for 1 sec to select the default value in this case E IF filter selection The transceiver has 3 passband width IF filters for each mode For SSB and CW modes the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps A total of 41 passband widths are available For RI TY mode the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps A total of 32 passband widths are available For AM and FM modes the passband width is fixed and 3 passband widths are available independently The filter selection is automatically memorized in Y each mode Y The PBT shift frequencies are automatically memo ZY rized in each filter Q IF filter selection 1 Select the desired mode 2 For RTTY mode turn OFF the RTTY filter 3 Push FILTER several times to select the IF
54. CW sidetone functions re gardless of the MONITOR switch setting Push MONITOR to switch the monitor function ON and OFF e MONI appears when the monitor function is ON 2 Set the monitor level Push MONITOR for 1 sec to select monitor pro gram mode Rotate the tuning dial for the clearest audio out put while pushing PTT and speaking into the mi crophone e Push F3 for 1 sec to select the default value 3 Push MENU to return to the previous menu C Joo gt O V O O CLEAR S Qrar _ O O O O O O Monitor indicator Shows monitor level E Speech compressor The speech compressor increases average RF output power improving signal strength and readability in SSB AM or FM When adjusting the compression level it is necessary to turn the COMP meter ON in the set mode in ad vance p 82 eIn SSB mode 1 Select USB or LSB mode and adjust MIC GAIN to a suitable level 2 While fii is selected push F3 if speech compressor ON e COMP appears 3 Push F3 i for 1 sec to select compression level set mode 4 While speaking into the microphone rotate the tun ing dial so that the COMP meter reads within the COMP zone with your normal voice level e Push F3 for 1 sec to sel
55. DESCRIPTION E Front panel HF VHF TRANSCEIVER TRANSMIT e_ ae os A CoC I IL JL IL HONES ELEC KEY MIC o Oo O O o 0 orgs menu CW RTTY AM FM FILTER POWER SWITCH POWER Push momentarily to turn power ON e Turn the optional DC power supply ON in advance Push for 1 sec to turn power OFF TRANSMIT SWITCH TRANSMIT Selects transmitting or receiving e The TX indicator lights red while transmitting and the RX indicator lights green when the squelch is open HEADPHONE JACK PHONES Accepts headphones e Output power 5 mW with an 8 Q load eWhen headphones are connected the internal speaker or connected external speaker does not function ELECTRONIC KEYER JACK ELEC KEY p 14 Accepts a paddle to activate the internal electronic keyer for CW operation e Selection between the internal electronic keyer bug key and straight key operation can be made in keyer set mode p 34 eA straight key jack is separately available on the rear panel See KEY on p 7 eKeyer polarity dot and dash can be reversed in keyer set mode p 34 e4 channel memory keyer is available for your conve nience p 30 OO CO OQ RF IjWR CWFITCH KEYS EED PAMP ATT NB VOX BK IN MONITOR CALL MICROPHONE CONNECTOR MIC
56. DOC 00 0 o0 00 e Antenna select function OFF In this case only ANT1 and the 144 MHz antenna connector can be used ANT switch does not func tion E Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically Once the tuner matches an antenna the variable ca pacitor angles are memorized as a preset point for each frequency range 100 kHz steps Therefore when you change the frequency range the variable capacitors are automatically preset to the memorized point CAUTION NEVER transmit with the tuner ON when no antenna is connected This will damage the transceiver Be careful of the antenna selection TUNER OPERATION Push TUNER to turn the internal antenna tuner ON The antenna is tuned automatically when the antenna SWR is higher than 1 5 1 eWhen the tuner is ON the TUNE indicator appears e MANUAL TUNING During SSB operation at low voice levels the internal tuner may not be tuned correctly In such cases man ual tuning is helpful Push TUNER for 1 sec to start manual tuning eA side tone is emitted and TUNE indicator blinks while tuning elf the tuner cannot reduce the SWR to less than 1 5 1 after 20 sec of tuning the TUNER switch indicator goes out e AUTOMATIC TUNER START HF bands only lf you want to deactivate the tuner under conditions of VSWR 1 5 1 or less use the auto tuner start
57. E Tone scan DTCS code scan E ODS AU OM iiien nrnna IIl E Simple band scope se seseesesee 47 operation ccccccceceeeeeeeeeeeneeeeeees 74 E Your first Contact c ceeeeeeeees IV E Preamp Attenuator cccsecceeeseee 48 E Ready to call CQ eee IX MERIT fUNCtION oo eeceecseeceeeseeeseeeeeeeees 4g 9 ANTENNA TUNER OPERATION E AGC function eee eeeeeeeeeeeeeeeees BG E E E 15 77 PANEL DESCRIPTION 1 12 E IF filter selection o on 50 E Antenna connection and selection 75 W Front panel s sssssssssssrinsssrrnssernnneen 1 E IF DSP filter shape 000 51 E Antenna tuner operation 76 W Rear panel cece eereeseenens 7 M Noise blanker ccecce 51 E Optional external tuner operation 77 E LCD display fesse eeeneeeeneeteeaneenes 9 E Meter peak hold function 51 E Multi function switches 11 E Twin PBT operation 52 10 DATA COMMUNICATION 78 80 E Microphone HM 36 e 12 M Noise reduction o i 53 M Connections iiie 78 E Notch function cere 53 E Packet AFSK operation 79 INSTALLATION AND W Dial lock function oo 53 E Adjusting the TNC output level 80 CONNECTIONS eeeeeeee 13 17 E Voice squelch control function 54 E Data transmission speed 80 E Unpacking seriousness 13 E Selecting a location n e 13 FUNCTIONS FOR TRANSMIT 11 SET MODE nsssssnnsnnnnnnnnnnnnn
58. HM 36 UP DOWN SWITCHES UP DN PTT SWITCH Change the selected readout frequency or memory Push and hold to transmit release to receive channel e Continuous pushing changes the frequency or memory channel number continuously eWhile pushing XFC the transmit readout frequency can be controlled while in spilt frequency operation e The UP DN switch can simulate a key paddle Preset in the keyer set mode p 34 e MICROPHONE CONNECTOR Front panel view Main readout AF output i ith AF BAL ee E 8 V DC output Max 10 mA le aes Microphone ground MOVEN Frequency down Ground through 470 Q 2 8 V DC output e E GND PTT ground S PTT Squelch closed High level CMa re AaS SeN CAUTION DO NOT short pin 2 to ground as this can damage the internal 8 V regulator NOTE DC voltage is applied to pin 1 for micro phone operation Take care when using a non lcom microphone 3 Frequency up down e HM 36 SCHEMATIC DIAGRAM MICROPHONE MICROPHONE CABLE MICROPHONE PLUG RECEIVE TRANSMIT E E Unpacking After unpacking immediately report any damage to the delivering carrier or dealer Keep the shipping cartons For a description and a diagram of accessory equip ment included with the IC 746PRO see Supplied ac cessories on p ii of this manual E Selecting a location Select a location for the transceiver that allows ade quate air circulation free f
59. INSTRUCTION MANUAL HF VHF 2 i ALL MODE TRANSCEIVER IC 746PRO 3 DUCUEDUAUATLCREALE REESE NR B NOTCH xo AF RF SQL mee lt j i i 14 DLII AGC This device complies with Part 15 of the FCC rules Operation is sub ject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Icom Inc FOREWORD We understand that you have a choice of many differ ent radios in the market place We want to take a cou ple of moments of your time to thank you for making the IC 746PRO your radio of choice and hope you agree with Icom s philosophy of technology first Many hours of research and development went into the de sign of your IC 746PRO Rather than completely redesigning all areas to create a new radio the engineering team at Icom decided to follow in the footsteps of the IC 746 one of the best value transceivers in the marketplace with the new PRO Focused on real world improvements compiled over the last few years from letters phone calls E Mails and newsgroup postings the engineering team at Icom is proud to say many of these changes were compiled from a list of suggestions from you the ama teur radio operator FEATURES e 32 bit Floating point DSP and 24 bit AD DA converter e DSP IF Filter creates 102 types of filter e All mode capabi
60. IO OUTPUT Connect to serial port parallel AF OUTPUT port speaker jack microphone jack and line IN OUT jack etc See the instruction manual of the application for details e When using a TNC MIC INPUT AFSK OUTPUT TNC or scan converter AF OUTPUT AF INPUT O O OoOo PTT SQL INPUT When using the VOX function no need to connect Refer to the instruction manual of the external equipment TNC etc When connecting the squelch line consult the necessary manual TNC etc 78 79 10 DATA COMMUNICATION E Packet AFSK operation Before operating packet AFSK be sure to consult the operating manual that came with your TNC Connect a TNC and PC p 78 Push a band key to select an operating band 3 Push SSB or AM FM to select the desired operat ing mode e After LSB or USB is selected push SSB for 1 sec to select LSB data or USB data mode or after AM or FM is selected push AM FM for 1 sec to select AM data or FM data mode e Generally LSB is used on HF bands and FM is used for packet operation on the VHF band 4 Rotate the tuning dial to tune the desired signal 6 Transmit your AFSK signals using your computer s keyboard e Rotate RF PWR to set the output power e Relative strength of the transmitted signal is indicated in the Po meter while operating the TNC eWhen operating in SSB data mode adjust output power so th
61. ION BANDWIDTH p 58 TEN i Push to select the transmission bandwidth eBandwidth is selectable from narrow middle ee and wide MEMORY KEYER MENU p 29 Push to select the memory keyer or keyer Cr se send menu depending on the KEVER ii setting in the set mode p 86 Brey MENU p 36 pi Push to select the RTTY menu BAND SCOPE FUNCTION p 47 mE Push to select the band scope screen M2 FUNCTIONS AGC p 49 yur w Push momentarily to change the time constant of the AGC circuit Push for 1 sec to enter to the AGC set mode DUPLEX p 44 ry yc gt Push momentarily to select the duplex di Fe rection or turn the function OFF e DUP_ or DUP indicator appears during duplex operation Push for 1 sec to turn the one touch re peater function ON OFF SPEECH COMPRESSOR p 58 tag Push momentarily to turn the speech Fs compressor function ON OFF e COMP indicator appears when the speech compressor is ON Push for 1 sec to enter to the compres sor set mode SCAN MENU p 70 Push to select the scan menu ha ae B MEMORY NAME MENU p 67 Push to select the memory name screen SWR GRAPH FUNCTION p 61 lt i Push to indicate the SWR graph screen jas eas TONE CONTROL SET MODE p 89 ke Push to enter the audio tone set mode ar FUNCTION p 54 xr Push to turn the VSC Voice Squelch Con trol function ON and OFF PANEL DESCRIPTION 1 E Microphone
62. L pot on the rear side of the transceiver for a zero beat with the received standard signal e Zero beat means that two signals are exactly the same frequency resulting in a single tone being emitted 9 Rotate the tuning dial counterclockwise to turn the calibration marker OFF Push MENU to exit set mode MAINTENANCE 13 POWER F INP M CL 8 0 F C o 0000 UU O M S Oo W l Ji s O MENU SSB ee RF SQL AF P AMP ATT RIT CLEAR pour raven MANKE Lem 94 Mm 14 CONTROL COMMAND E Remote jack CI V information eCI V connection example The transceiver can be connected through an optional ee CT 17 Cl V LEVEL CONVERTER to a personal computer z 9 15 V equipped with an RS 232C port The Icom Communi oS a DC cations Interface V CI V controls the following func tions of the transceiver personal Up to 4 Icom CI V transceivers or transceivers can be computer connected to a personal computer equipped with an RS 232C port See p 88 for setting the CI V condition using set mode e Data format The Cl V system can be o
63. MP P AMP or P AMP appears when the preamp 1 preamp 2 or preamp is set to ON respec tively depending on operating frequency band Push PAMP ATT for 1 sec to set the attenuator ON ePush P AMP ATT momentarily to turn the attenuator OFF e ATT appears when the attenuator is set to ON e Noise blanker p 51 Push NB to turn the noise blanker ON and OFF e NB appears when the noise blanker is set to ON e Push NB for 1 sec to enter noise blanker set mode e Noise reduction p 53 Push NR to turn the noise reduction ON and OFF e Rotate NR control to adjust the noise reduction level e NR appears when the noise reduction is set to ON Convenient functions for transmit e Speech compressor p 58 While fii is selected with MENU push F3 fF to turn the speech compressor ON and OFF e COMP appears when the speech compressor is set to ON e VOX voice operated transmit p 55 Push VOX BK IN to turn the VOX function ON and OFF e VOX appears when the VOX function is set to ON 4 MIC GAIN SSB Tuning dial LSB or USB appears e Auto notch filter p 53 Push B NOTCH to turn the auto or manual notch function ON and OFF Rotate NOTCH control to set the attenuating fre quency for manual notch operation e Twin PBT passband tuning p 52 Rotate TWIN PB
64. MW for 1 sec to program the displayed fre quency and operating mode into the memory chan nel e3 beeps are emitted when memory programming is suc cessful E Memory clearing Any unnecessary memory channels can be cleared The cleared memory channels become blank chan nels 1 Select memory mode with V M 2 Select the desired memory channel with M CH 3 Push M CL for 1 sec to clear the contents e The programmed frequency and operating mode disap pear e3 beeps are emitted when memory clearing is success ful 4 To clear other memory channels repeat steps 2 and 3 Sj cials oggy Ca GJ Ee tf amp IJ C E E E E 6 ee ee Ct On V M M CH e EXAMPLE Programming 7 088 MHZ LSB into memory channel 12 e EXAMPLE Programming 21 280 MHZ USB Into memory channel 18 M CL Cl L C YC M o3 6 0 6365 oaa COO V M M CH MEMORY OPERATION E Selecting the call channel By default 145 00000 MHz FM is programmed into the call channel However this can be changed to suit your operating preference see below Push CALL to select the call channel e C appears 2 Push CALL again to return to the previous mode
65. N or OFF only there is no preamp 1 and preamp 2 P AMP Regular preamp the most effective for 1 8 to a 21 MHz bands without IMD corruption PAMp High gain preamp the most effective for 24 to 50 MHz bands Preamp activates for the VHF band 144 to 146 MHz range 108 to 174 for the USA version Push P AMP ATT for 1 sec to set the attenuator ON e ATT appears in the display when the function is set ON e Push P AMP ATT momentarily to set the attenuator OFF FUNCTIONS FORRECEIVE 5 P AMP ATT P AMP ATT P AMP ATT Push CO Push CO for 1sec P AMP ATT P AMP ATT ATT ON BRIT function The RIT Receive Increment Tuning function compen sates for off frequencies of the communicating station The function shifts the receive frequency up to 9 99 kHz in 10 Hz steps without moving the transmit frequency e See on p 4 for function description C Push RIT to turn the RIT function ON and OFF e RIT and the shifting frequency appear when the func tion is ON 2 Rotate the RIT ATX control e Push CLEAR for 1 sec to reset the RIT frequency ePush CLEAR momentarily to reset the RIT frequency when the quick RIT clear function is ON p 86 e Push RIT for 1 sec to add the shift frequency to the op erating frequency RIT monitor function When the RIT function is ON pushing and holding XF
66. NR to turn the noise reduction ON and OFF e Rotate NR control to adjust the noise reduction level e NR appears when the noise reduction is set to ON Convenient functions for transmit e Speech compressor p 58 While fii is selected with MENU push F3 hii to turn the speech compressor ON and OFF e COMP appears when the speech compressor is set to ON e VOX voice operated transmit p 55 Push VOX BK IN to turn the VOX function ON and OFF e VOX appears when the VOX function is set to ON RECEIVE AND TRANSMIT 4 TRANSMIT TX indicator Z Band keys S eee GJS ota O O s E AM FM Tuning dial MIC GAIN e Auto notch filter p 53 Push NOTCH to turn the auto or manual notch filter ON and OFF eRotate NOTCH control to set the attenuating fre quency for manual notch operation elF shift p 52 Rotate TWIN PBT controls inner only e Push PBTC to clear the settings e AGC auto gain control p 49 While fii is selected with MENU push F1 Hat several times to select AGC AGC M AGC amp or AGC OFF e VSC voice squelch control p 54 While fi is selected with MENU push F5 r to turn the VSC function ON and OFF eThe VSC indicator appears when the voice squelch function is set to ON e Transmit quality monitor p 57 Push MONITOR to turn the monitor fu
67. P filter p 52 ePassband width and shift frequency are displayed in the multi function switch indicator e Push PBTC for 1 sec to clear the settings when not in use eVariable range is set to half of the IF filter passband width 25 Hz steps and 50 Hz steps are available e These controls function as an IF shift control while in AM mode and when the RTTY filter is turned ON Only the inner control may function in this case VY What is the PBT control General PBT function electronically narrows the IF passband width to reject interference This transceiver uses the DSP circuit for the PBT function TWIN PBT N PBT1 P PBT2 Low cut Center High cut SPLIT INDICATOR p 59 Lights during split operation FREQUENCY INPUT SWITCH F INP p 22 Push to toggle keypad input between frequency and band eThe frequency input indicator lights when fre quency input is selected for the keypad FREQUENCY INPUT INDICATOR p 22 Lights when frequency input from the keypad is en abled PANEL DESCRIPTION 1 KEYPAD Pushing a key selects the operating band e GENE selects the general coverage band Pushing the same key 2 or 3 times calls up other stacked frequencies and modes in the band p 19 elcom s triple band stacking register memorizes 3 fre quencies in each band After pushing F INP enter a keyed frequency Pushing 144 ENT is necessary at the end p 22 ee g to enter 14 195
68. P1 is programmed with 0 50000 MHz and P2 is pro grammed with 29 99999 MHz If P1 and P2 are pro grammed with the same frequencies programmed scan will not proceed EXAMPLE Programming 14 00000 MHz into P1 and 14 35000 MHz into P2 1 Push V M to select VFO mode if necessary 2 Rotate M CH to select scan edge P1 3 Rotate the tuning dial to set 14 00000 MHz as the lower frequency 4 Push MW for 1 sec to program 14 00000 MHz into scan edge P1 e3 beeps are emitted 5 Rotate M CH to select scan edge P2 6 Rotate the tuning dial to set 14 35000 MHz as the upper frequency T Push MW for 1 sec to program 14 35000 MHz into scan edge P2 e3 beeps are emitted eWhen programmed scan is activated p 71 scanning will search the frequencies between 14 00000 MHz and 14 35000 MHz for signals MEMORY OPERATION V M MW e After steps 2 to Tuning dial M CH 66 MEMORY OPERATION E Assigning memory names All memory channels including scan edges can be tagged with alphanumeric names of up to 9 characters each EXAMPLE Programming DX spot into memory channel 99 1 Push V M to select memory mode if necessary 2 Rotate M CH to select memory channel 99 3 Push Leite several times to select i 4 Push F2 fE to select the memory name screen 5 Push F1 or aT to
69. RTTY mode Space Mark BFO BFO Space Mark Switches RTTY filter ON and OFF Push Cf Jit J s Jt Fe Push RTTY filter set mode p 37 Push RTTY set mode p 39 4 36 4 RECEIVE AND TRANSMIT RTTY filter Twin peak filter The transceiver has 5 RTTY filters in addition to nor mal IF filters The passband width can be selected from 1kHz 500 Hz 350 Hz 300 Hz and 250 Hz When the RTTY filter is turned ON the RTTY tuning meter can be used Moreover the twin peak filter changes the receive fre quency response by boosting 2 particular frequencies 2125 and 2295 Hz for better copying of desired RTTY signals e RTTY filter and twin peak filter setting Push CW RTTY to select RTTY mode e After RT TY mode is selected push CW RTTY for 1 sec to select RT TY R mode 2 Push MENU several times to select fii 3 Push F4 kt to select RTTY menu eWhen the RTTY filter is turned ON the normal IF filter number indication or amp disappears 7 Rotate the tuning dial to select the RTTY filter width from 1 kHz 500 Hz 350 Hz 300 Hz and 250 Hz e Push F3 for 1 sec to select a default value e The received audio volume may become greater when the twin peak filter is turned ON 9 Rotate the tuning dial to turn the twin peak filter function ON and OFF Push MENU 2 times to return to 4 e RTTY filter set mode This item sets the RTTY filter width e250 300 350 500 Hz and
70. S F1 F5 PREAMP ATTENUATOR SWITCH P AMP ATT Push to select the function indicated in the LCD p 48 display above these switches p 11 Push momentarily to toggle between preamp 1 e Functions vary depending on the operating mode and preamp 2 Push to input a character for memory keyer pro P AMP activates for HF all bands gramming or memory name pgs 31 67 P AMP activates high gain preamp for 24 MHz band and above MENU SWITCH MENU Push for 1 sec to toggle the attenuator function Push to change the set of functions assigned to the ON and OFF multi function switches e Toggles between menu 1 14 and menu 2 f s What Is the pr eamp l The preamp amplifies received signals in the front end cir MODE SWITCHES cuit to improve the S N ratio and sensitivity Select P AMPEB Selects the desired mode p 23 or PAAMP when receiving weak signals e Announces the selected mode when an optional UT 102 is installed p 90 Y What is the attenuator The attenuator prevents a desired signal from distorting Selects USB and LSB mode alternately when very strong signals are near the desired frequency or Selects SSB data mode USB D LSB D when very strong electric fields such as from a broadcast when pushed for 1 sec in SSB mode ing station are near your location Selects CW and RTTY mode alternately NOISE BLANKER SWITCH NB p 51 sli teal ee da pay Switches the noise bl
71. T controls inner outer e Push PBTC to clear the settings e AGC auto gain control p 49 While fii is selected with MENU push AGC M AGC B or AGC OFF e VSC voice squelch control p 54 While fi is selected with MENU push F5 r to turn the VSC function ON and OFF eThe VSC indicator appears when the voice squelch function is set to ON e Transmit quality monitor p 57 Push MONITOR to turn the monitor function ON and OFF e MONI appears when the monitor function is set to ON e Audio tone control p 89 While fi is selected with MENU push F4 rotate the tuning dial to adjust the audio tone 26 27 4 RECEIVE AND TRANSMIT E Operating CW 1 Push a band key to select the desired band 2 Push CW RTTY to select CW e After CW mode is selected push CW RTTY for 1 sec to toggle between CW and CW R modes 3 Rotate AF to set audio to a comfortable listening level 4 Rotate the tuning dial to simultaneously tune a de sired signal and its side tone S meter indicates received signal strength Push TRANSMIT to transmit e The TX indicator lights red 6 Use the electric keyer or paddle to key your CW sig nals e The Po meter indicates transmitted CW signal strength 7 Adjust CW speed with KEY SPEED Push TRANSMIT to return to receive Convenient functions for receive e Preamp and attenuator p 48 Push P AMP ATT several times to set
72. T 102 into J1920 on the MAIN unit as shown in the diagram at right 4 Adjust the trimmer SPCH LVL R1925 on the MAIN Vs unit to set the speech level if desired Refer to the s illustration at right 5 Return the top and bottom covers to their original op positions MAIN unit 90 91 12 OPTION INSTALLATION E CR 338 HIGH STABILITY CRYSTAL UNIT By installing the CR 338 the total frequency stability of the transceiver will be improved 1 Remove the bottom covers as shown on the previ ous page 2 Remove the 4 screws from the shield cover of the RF unit and disconnect P2 CHASSIS from J761 MAIN then lift up the shield cover 3 Remove the 8 screws from the RF unit disconnect J1 J121 and J151 then remove the RF unit 4 Remove the supplied internal crystal and replace with the CR 338 5 Return the RF unit J1 J121 and J151 to their orig inal positions 6 Connect a frequency counter to the J262 2LO IN then adjust the reference frequency to be 64 00000 MHz with the L1901 on the RF unit 7 Return the J262 shield cover P2 and bottom cov ers to their original positions Shield cover P2 CHASSIS RF unit TUNER AS antenna tuner connector J761 MAIN unit i A belt II J151 Soldering Connect a frequency counter then adjust the frequency to be 64 00000 MHZ RF unit LD HO y ae ey ae o o J262 NI o D O L1 o SSS
73. T CLEAR SWITCH PBTC p 52 Clears the PBT settings when pushed for 1 sec 1 PANEL DESCRIPTION E Front panel continued HF VHF TR NSCEIVER Ta PBT a2 il o a CW PITCH KEYSPEED P AMP ATT NB VOX BK IN MONITOR TRANSMIT FREQUENCY CHECK SWITCH XFC pgs 45 48 Monitors the transmit frequency when pushed and held e While pushing this switch the transmit frequency can be changed with the tuning dial keypad or memo pad e When the split lock function is turned ON pushing XFC cancels the dial lock function p 60 amp MEMO PAD WRITE SWITCH MP W p 68 Programs the selected readout frequency and op erating mode into a memo pad e The 5 most recent entries remain in memo pads e The transmit frequency is programmed when pushed to gether with XFC e The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience p 85 TRANSMIT INDICATOR TX Lights red while transmitting MEMO PAD READ SWITCH MP R p 68 Each push calls up a frequency and operating mode in a memo pad The 5 or 10 most recently programmed frequencies and operating modes can be recalled starting from the most recent e The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience p 85 RECEIVE INDICATOR RX Lights green while receiving a signal and when
74. TTENUATOR INDICATOR p 48 Appears when the attenuator is activated AGC INDICATORS p 49 Shows the selected AGC time constant e B for AGC fast OQ for AGC middle B for AGC slow OFF for AGC OFF NOISE BLANKER INDICATOR p 51 Appears when the noise blanker is activated DTCS INDICATOR p 43 Appears during DTCS operation TONE SQUELCH INDICATORS T appears when the repeater tone is activated p 44 w TSQL appears during tone squelch operation p 42 DUPLEX INDICATOR p 44 DUP or DUP appears during repeater opera tion PANEL DESCRIPTION 1 NOISE REDUCTION INDICATOR p 53 Appears when the noise reduction is activated NOTCH INDICATORS p 53 NOTCH appears when the manual notch func tion is activated EYNOTCH appears when the automatic notch function is activated SPLIT INDICATOR pgs 59 60 Appears during split operation MEMORY INDICATOR p 62 Appears during memory mode VFO INDICATORS p 20 Indicates whether VFO A or VFO B is selected RIT ATX INDICATORS pgs 48 57 Appears during RIT or ATX operation and indicates the frequency offset 1 PANEL DESCRIPTION E Multi function switches SM1 FUNCTIONS During SSB operation Yq TUNING FUNCTION p 21 Push to turn the tuning function a ON OFF A indicator appears when the 1 4 tuning function is ON TRANSMISS
75. TTY decoder screen 4 The number of line of text can be selected from 2 or Y 3 in the display The UnShift On Space USOS Y function and new line code can be set in the RT TY 4 set mode p 39 RECEIVE AND TRANSMIT oe A ee oe ee Push F4 CET eS SEa a Push F2 Te Te Appears while the RTTY decoder screen is freezed with F2 operation Push F3 to erase the displayed characters Ce ee a Push F1 Las Threshold level indication 4 38 39 4 RECEIVE AND TRANSMIT RTTY set mode This set mode is used to set the mark and shift fre quencies keying type decode USOS function etc e Setting contents Push MENU to select fi then push F4 krt to select the RTTY menu 4 Set the desired condition using the tuning dial e Push F3 for 1 sec to select a default condition or value 5 Push MENU 2 times to return to fii Sets the mark frequency for RI TY operation e1275 1615 and 2125 Hz are selectable Sets the shift frequency for RTTY operation e170 200 and 425 Hz are selectable Selects the keying polarity from normal and reverse LA Key open close Mark Space Lieprii Key open close Space Mark 4 Dec LESE Turn the USOS UnShift On Space function ON OFF Decode as letter code Decode as character code 9 Case Plows Lopes Selects the new line code of the internal RT TY decoder CR Carriage Return LF Line Feed CR LF and CR LF CR LF only
76. V rms Rear panel view default settings see notes below SQLS Squelch output SQL open Less than 0 3 V 5 mA Goes to ground when squelch opens SQL closed More than 6 0 V 100 pA Output current Max 1 A Po S eee OUE NNER BOWELS ae Connected in parallel with ACC 2 pin 7 Control voltage 4 Vto0V ALC ALC voltage input Input impedance More than 10 kQ Connected in parallel with ACC 2 pin 5 Output voltage 8 V 0 3 V PPARA ONRU Output current Less than 10 mA EALA Same as ACC 1 pin 2 3 HSEND Same as ACC 1 pin 3 A S Band voltage output TD io a BAND Varies with amateur band Output voltage O to 8 0 V OmV 5 ALC Same as ACC 1 pin 8 Bear oane View Input output pin 144 MHz only Ground level 0 5 V to 0 8 V P VSEND Goes to ground when transmitting Output current Less than 20 mA When grounded transmits Input current Tx Less than 200 mA EA 13 8 V Same as ACC 1 pin 7 1 PANEL DESCRIPTION E LCD display FREQUENCY READOUTS Shows the operating frequency MULTI FUNCTION METER INDICATION Shows receiving signal strength etc during re ceive Shows transmit output power ALC and SWR dur ing transmit VOX INDICATOR p 55 Appears when the VOX function is activated MICROPHONE COMPRESSOR INDICATOR p 58 Appears when the microphone compressor is acti vated MULTI FUNCTION SWITCH INDICATOR p 11 Indicates the functions assigned to the multi
77. Y filter bandwidth 0 250 Hz 1 300 Hz 2 350 Hz 3 500 Hz 4 1 kHz Send read twin peak filter O OFF 1 ON Send read RTTY mark frequency 0 1275 Hz 1 1615 Hz 2 2125 Hz Send read RTTY shift width 0 170 Hz 1 200 Hz 2 425 Hz Send read RTTY keying polarity O Normal 1 Reverse Send read RTTY decode USOS O OFF 1 ON Send read RTTY decode new line code O CR LF CR LF 1 CR LF Send read number of RTTY de coder line O 2 lines 1 3 lines Send read scan speed 0 Low 1 High Send read scan resume O OFF 1 ON Send read NB level 0 0 to 255 100 Send read VOX gain 0 0 to 255 100 Send read anti VOX gain O 0 to 255 100 Send read VOX delay 0 0 0 sec to 20 2 0 sec Send read Break IN delay set 20 2 0d to 130 13 0d e Command table continued 1A Send read MONITOR level 0 0 to 255 100 Send read DATA mode 0 OFF 1 ON Send read SSB transmit band width O WIDE 1 MID 2 NAR Send read DSP filter shape O sharp 1 soft Set read repeater tone frequency To send read memory contents When sending or reading memory contents additional code as follows must be added to appoint the memory channel Additional code 0000 0102 0100 P1 0101 P2 0102 Call see p 98 for details Set read TSQL tone frequency see p 98 for details Set read DTCS code and polarity see p 98 for details Set read the transceiver s condi tion O Rx 1 Tx Set read antenna tuner conditio
78. anker ON and OFF when p pushed The noise blanker reduces pulse type mora noise such as that generated by automobile igni Switches RTTY and RTTY R RTTY re A RE g tion systems This function cannot be used for verse mode when pushed for 1 sec in FM or non pulse type noise PERONA e NB appears while the noise blanker is activated Selects AM and FM mode alternately Enters the noise blanker level set mode when a Selects AM FM data mode AM D FM D pushed for 1 sec when pushed for 1 sec in AM FM mode VOX BREAK IN SWITCH VOX BK IN n SSB AM and FM modes push momentarily to turn the VOX function ON and OFF p 55 push for 1 sec to enter VOX set mode p 55 n CW mode push momentarily to turn the semi break in full break in or break in OFF p 56 push for 1 sec to enter break in set mode p 56 Y What is the VOX function The VOX function voice operated transmission starts trans mission without pushing the transmit switch or PTT switch when you speak into the microphone then automatically re turns to receive when you stop speaking VY What is the break in function Full break in QSK activates the receiver between transmit ted dots and dashes This is useful when operating in nets or during DX pileups and during contests when fast ex changes are common MONITOR SWITCH MONITOR p 57 Monitors your transmitted signal Enters monitor set mode when pushed for 1 s
79. at the ALC reading in the ALC meter stays in the ALC zone NOTE When connecting a TNC to the ACC socket on the rear panel select SSB LSB USB data mode or disconnect the microphone and rotate MIC GAIN fully counterclockwise When SSB data mode is selected the audio input from the MIC connector is automatically cut and the audio input from the ACC 1 is used Also when the SSB data mode is selected the fixed setting listed below are selected automatically e Speech compressor OFF eTransmit bandwidth MID e Tx tone Bass 0 e Tx tone Treble 0 aee MIC GAIN SSB AM FM Tuning dial Selected mode indicator appears Frequency indication during AFSK operation When operating AFSK in SSB mode the indicated fre quency is the signals carrier point e Example LSB LSB data mode Mark freq 2125 Hz Shift freq 200 Hz 2325 Hz 200 Hz 2125 Hz lt e Carrier point Displayed frequency E Adjusting the TNC output level When setting data transmission speed to 9600 bps the data signal coming from the TNC is applied exclu sively to the internal limiter circuitry to automatically maintain band width NEVER apply data levels from the TNC of over 0 6 V p p otherwise the transceiver will not be able to main tain the band width and may possibly interfere with other stations Using with a level meter or synchroscope Wh
80. ated fuse The IC 746PRO has 2 types of fuses installed for transceiver protection e DC power cable fuses c cecceeeeeeeeees FGB 30 A Circuitry fuse on nnnnennennnnnsenensnnnnennnenrrnsernnne FGB 5A DC power cable fuse replacement Refer the figure illustrated at right for the DC power cable fuse replacement Circuitry fuse replacement The 13 8 V DC from the DC power cable is applied to all units in the IC 746PRO except for the power am plifier through the circuitry fuse This fuse is installed in the PA unit 1 Remove the top cover as shown on p 90 2 Remove the 11 screws from the PA shielding plate then remove the plate 3 Replace the circuitry fuse as shown in the diagram at right 4 Replace the PA shielding plate and top cover E Tuning dial brake adjustment The tension of the tuning dial may be adjusted to suit your preference The brake adjustment screw is located on the right side of the tuning dial See the figure at right Turn the brake adjustment screw clockwise or counter clockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction E Resetting the CPU When first applying power or when the function does not seem to be operating normally reset the CPU as follows 1 Make sure the transceiver power is OFF 2 While pushing M CL and
81. ating mode or distorted ePBT function is activated e Push PBTC for 1 sec to reset the function e Noise blanker is turned ON when receiving a Push NB to turn the noise blanker OFF strong signal Preamp is activated ePush P AMP ATT once or twice to turn the function OFF e The noise reduction is activated and the NR Set the NR control for maximum readability control is too far clockwise The ANT switch does not The antenna switch has not been activated e Set the antenna switch in set mode to Auto or p 85 function Manual Transmitting is impossible e The operating frequency is not set to a ham Set the frequency to a ham band band Output power is too low RF PWR is set too far counterclockwise e Rotate RF PWR clockwise e MIC GAIN is set too far counterclockwise e Set MIC GAIN to a suitable position e The antenna for another band is selected e Select an antenna suitable for the operating fre quency e The antenna is not properly tuned ePush TUNER for 1 sec to manually tune the pgs 76 antenna No contact possible with RIT or ATX function is activated e Push RIT or ATX to turn the function OFF another station e Split frequency and or duplex function are acti Push SPLIT and or F2 lt 4 in 4 to turn pgs vated the function OFF Transmit signal is unclear MIC GAIN is set too far clockwise e Set MIC GAIN to a suitable position or
82. characteristics etc CLEAR SWITCH CLEAR pgs 48 57 Clears the RIT ATX shift frequency when pushed for 1 sec eCan be cleared instantly when CLEAR is pushed if the Quick RIT Clear is set to ON p 86 amp ATX SWITCH ATX p 57 Turns the ATX function ON and OFF when pushed e Use the RIT ATX control to vary the ATX frequency Adds the ATX shift frequency to the operating frequency when pushed for 1 sec Y What is the ATX function The ATX shifts the transmit frequency without shifting the re ceive frequency This is useful for simple split frequency op eration in CW etc amp MEMORY CHANNEL SELECTOR M CH p 62 Select a memory channel e Rotate clockwise to increase the memory channel ro tate counterclockwise to decrease the memory channel D VFO MEMORY SWITCH VFO MEMO Switches the selected readout operating mode between the VFO mode and memory mode when pushed pgs 20 62 Transfers the memory contents to VFO when pushed for 1 sec p 65 MEMORY CLEAR SWITCH M CL p 63 Clears the selected readout memory channel con tents when pushed for 1 sec in memory mode e The channel becomes a blank channel e This switch does not function in VFO mode MEMORY WRITE SWITCH MW p 63 Stores the selected readout frequency and operat ing mode into the displayed memory channel when pushed for 1 sec eThis function is available both in VFO and memory modes amp PB
83. cted operating frequency to make sure transmitting won t cause inter ference to other stations on the same frequency C Push PTT microphone to transmit e Talk into the microphone at your normal voice level 2 While talking into the microphone rotate MIC GAIN so that the ALC meter reading doesn t go outside the ALC zone see right 3 Release PTT microphone to return to receive TRANSMIT TX indicator Joo MIC GAIN RF PWR 20 40 60 SC eeoeoeeese HF 2eeeeeeveeormnrn ee eeee ee e 100 ALC R E E Loe e ALC zone RECEIVE AND TRANSMIT E Operating SSB 1 Push a band key to select the desired band 2 Push SSB to select LSB or USB Below 10 MHz LSB is automatically selected above 10 MHz USB is automatically selected 3 Rotate AF to set audio to a comfortable listening level 4 Rotate the tuning dial to tune a desired signal S meter indicates received signal strength 5 Push TRANSMIT or PTT microphone to trans mit e The TX indicator lights red 6 Speak into the microphone at your normal voice level e Adjust MIC GAIN at this step if necessary T Push TRANSMIT or release PTT microphone to return to receive Convenient functions for receive e Preamp and attenuator p 48 Push P AMP ATT several times to set the pre amp OFF preamp 1 ON or preamp 2 ON PA
84. e set mode 4 Set the desired condition using the tuning dial e Push F3 for 1 sec to select a default condition or value 5 Push MENU to exit the set mode Set mode items 100 in 1 steps default 50 This item adjusts the brightness of the LCD from 0 to 100 in 1 steps default 50 3 re ee gm m This item adjusts the volume level for confirmation beep tones from 0 to 100 in 1 steps When the beep tones item 6 Fsg p 82 are turned OFF this setting has no effect default 50 4 eee f gna m f e i rT This item allows you to set a maximum volume level for confirmation beep tones Confirmation beep tones are linked to the AF control until a specified volume level is reached further rotation of the AF control will not increase the volume of the beep tones Confirmation beep ON default Confirmation beep OFF This item is used for a simple frequency check of the transceiver Calibration marker ON Calibration marker OFF default See p 94 for calibration procedure eee Turn the calibration marker OFF after checking the frequency of the transceiver E General set mode continued 6 ExzeP A beep sounds each time a switch is pushed to con firm it This function can be turned OFF for silent op eration Confirmation beep ON default Confirmation beep OFF The volume
85. ec FILTER SWITCH FILTER p 50 Selects one of 3 IF filter settings Enters the filter set mode when pushed for 1 sec CALL SWITCH CALL p 64 Selects the call channel when pushed momentarily TUNING DIAL p 21 Changes the displayed frequency selects set mode items etc LOCK SPEECH SWITCH LOCK SPCH Push momentarily to toggle the dial lock function ON and OFF p 53 Pushing for 1 sec announces the selected read out frequency and S meter indication when an optional UT 102 is installed p 90 RIT ATX CONTROL RIT ATX pgs 48 57 Shifts the receive and or transmit frequency without changing the transmit and or receive frequency while the RIT and or ATX functions are ON e Rotate the control clockwise to increase the frequency or rotate the control counterclockwise to decrease the frequency e The shift frequency range is 9 99 kHz in 10 Hz steps RIT ATX Low shift EF PANEL DESCRIPTION 1 RIT SWITCH RIT p 48 Turns the RIT function ON and OFF when pushed e Use the RIT ATX control to vary the RIT frequency Adds the RIT shift frequency to the operating fre quency when pushed for 1 sec Y What is the RIT function The RIT Receiver Incremental Tuning shifts the receive fre quency without shifting the transmit frequency This is useful for fine tuning stations calling you on an off fre quency or when you prefer to listen to slightly different sounding voice
86. ec 3 CW RTTY BFO BFO Interference Desired signal Interference Desired signal CW mode LSB side CW R mode USB side KEY SPEED 4 28 29 4 RECEIVE AND TRANSMIT E Electronic keyer functions The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu Push CW RTTY to select CW mode 2 Push MENU to select fi7 3 Push F4 zE to select the memory keyer menu e The selectable menu can be changed with the keyer send menu in the set mode p 87 4 Push one of the multi function keys F1 to F5 to select an item in the memory keyer menu See the diagram below e Push MENU to return to the previous indication MENU CW RTTY QIN CW MODE e Keyer send menu p 30 aun uunuae Push MENU e Memory keyer menu Yv eueeee gt pale a eu ee Cee ee E ri i piat o PLS 1 ts i E eee un Se a ot on a e Edit menu p 31 cee anata aeaaaee HO Poa ae eae Gh uel S cieecoment ie E Ca a 9 a tf Push s an EEE Hn EENE HE a Push F4 Memory keyer send menu Pre set characters can be sent using the keyer send menu Contents of the memory k
87. ect the default value 4 Nhen the COMP meter peaks above the COMP zone your transmitted voice may be distorted Push MENU to return to t14 to turn the eIn AM FM mode While is selected push F3 if speech compressor ON e COMP appears 2 Push F3 ff for 1 sec and set the compression level as 1 in advance 3 While speaking into the microphone rotate MIC GAIN so that the COMP meter does not exceed the center dot whether you speak softly or loudly 4 While speaking into the microphone rotate the tun ing dial so that the COMP meter reads within the COMP zone with your normal voice level e Push F3 for 1 sec to select the default value When the COMP meter peaks above the COMP zone your transmitted voice may be distorted 5 Push MENU to return to 44 to turn the FUNCTIONS FOR TRANSMIT AGC FILTER M A Compressor indicator Shows compression level 40 60 a A Anann nnan D ET a AG mala i lt COMP meter COMP level zone The SWR meter functions as the COMP meter when COMP meter is set to ON in the set mode FILTER a ALC NUNHHEERERERRGREE PTET LLL rT l Adjust MIC GAIN so that the COMP meter does not exceed this zone ALC SN HU0EREREREREREE TEL ELLE LEE LLL Ce ee Adjust the fee with the tuning dial so that the COMP meler does not exceed the COMP level zone E Transmit filter width selection SSB mode only T
88. edit memory channel name eA cursor appears and blinks Memory channel names of blank channels cannot be edited 6 Push F1 several times to select the type of char acters for input eo inputs capital letters A to Z ae yn inputs small letters a to zZ o guh ge IS usea to input other characters amp PA acca lt gt 1_7 are available e Use the keypad to directly input numerals 0 to 9 in cluding a decimal point 7 Rotate the tuning dial to select the first character for input Push F2 4 or F3 to move the cursor forwards or IRCA respectively e Push F5 to input a space and F4 f the E character 9 Repeat steps to 8 to program another memory channel s name if desired Push MENU to set the memory channel name and return to the memory name menu e Push MENU 1 more times to return to piz i_ to delete snares MENU Tuning dial M CH e During assigning a memory name Input space Delete a character Move cursor forwards Move cursor backwards Selects character type e After assigning a memory name MEMORY OPERATION E Memo pads The transceiver has a memo pad function to store fre quency and operating mode for easy write and recall The memo pads are separate from memory channels The default number of memo pads is 5
89. efault in set mode p 83 Push F4 Ti to turn the repeater tone ON e T appears e Set the tone frequency in tone frequency set mode in advance if desired p 45 88 5 Hz is set by default To transmit a 1750 Hz European repeater tone push F4 Fi while transmitting 7 Communicate in the normal way One touch repeater function This function allows you to set repeater operation with push of one switch To set the transceiver for repeater operation using the one touch repeater function follow the steps to 4 as above then push F2 fi for 1 sec vance p 83 as well as the tone frequency see g the offset shift direction and frequency in ad p 45 RECEIVE AND TRANSMIT eeecerreanneereecee en ee ee ee we ew o ee ee Push F2 F4 ae ee Appears weeeerereanneeeeecee rn ee ee ee we ew o CEE Ee ee a R Push F2 for 1 sec a m k DUP FILTER T 1 d E E a Appears 4 44 45 4 RECEIVE AND TRANSMIT Transmit frequency monitor check You may be able to receive the other party s transmit signal directly without having to go through a repeater This function allows you to check this While receiving push and hold XFC to see if you can receive the other party s transmit signal directly eWhile holding XFC the offset direction and frequency are displayed on the multi function switch indicator Repeater tone frequencies T
90. ems PANEL DESCRIPTION 1 DATA SOCKET DATA IN Input terminal for data transmit 1200 bps AFSK 9600 bps G3RUH GMSK Common ground for DATA IN DATA OUT and AF OUT PTT P PTT terminal for packet operation Connect ground to transmit data DATA OUT Data out terminal for 9600 bps operation only AF OUT Data out terminal for 1200 bps operation only Squelch out terminal Becomes high 8 V when the transceiver receives a signal which opens the squelch Rear panel view P SQL _ eTo avoid unnecessary TNC transmission connect squelch to the TNC to inhibit trans mission when receiving signals Keep audio output at a normal level otherwise a P SQL signal will not be output ACC SOCKETS High level More than 2 4 V 1 RTTY Controls RTTY keying Low level Less than 0 6 V Output current Less than 2 mA 2 GND Connects to ground Connected in parallel with ACC 2 pin 2 Ground level 0 5 V to 0 8 V F e aa cae acca Output current Less than 20 mA HSEND Goes to ground when transmitting Input current Tx Less than 200 mA Mnemigrounceg wanoils Connected in parallel with ACC 2 pin 3 R 5 4 MOD Modulator input Input impedance 10 kQ i 3 Connects to a modulator Input level Approx 100 mV rms gt AF ORIELO GUIDU __ _ Output impedance 4 7 KQ Fixed eo of AF position in l Output level 100 300 m
91. en using a level meter or synchroscope adjust the TX audio output level DATA IN level from the TNC as follows 0 4 V p p 0 2 Vrms recommended level 0 2 0 5 V p p 0 1 0 25 Vrms acceptable level Not using a measuring device 1 Connect the transceiver to a TNC p 78 2 Enter a test mode CAL etc on the TNC then transmit some test data 3 When the transceiver fails to transmit the test data or transmits sporadically TX indicator doesn t light or flashes Decrease the TNC output level until the transmit indicator lights continuously When transmission is not successful even though the TX indicator lights continuously Increase the TNC output level E Data transmission speed For data communication in FM mode the transceiver can be set to to a maximum data speeds of 9600 bps or less 1200 2400 or 4800 bps Push MENU for 1 sec to enter set mode Pki Item 3 Rotate the tuning dial to turn the 9600 bps mode ON and OFF 9600 bps of data speed default 4 Push MENU to return to previous indication DATA COMMUNICATION 10 Select with the tuning dial 80 EE 11 setMope 81 E General set mode Entering set mode Set mode is used for programming infrequently changed values or conditions of functions e Set mode operation 1 Push MENU several times to select the function menu indication if necessary 2 Push MENU for 1 sec to enter th
92. er nal equipment such as a linear amplifier e Max control level 16 V DC 0 5A CAUTION Be sure the linear amplifiers keying cir cuit control voltage is compatible to the IC 746PRO before connecting to SEND ALC INPUT JACK ALC p 17 Connects to the ALC output jack of a non Icom lin ear amplifier ACCESSORY SOCKET 2 ACC 2 ACCESSORY SOCKET 1 ACC 1 Enables connection of external equipment such as a linear amplifier an automatic antenna selector tuner TNC for data communications etc e See p 8 for socket information STRAIGHT KEY JACK KEY p 14 Accepts a straight key or external electronic keyer with 1 4 inch standard plug e ELEC KEY on the front panel can be used for a straight key or external electronic keyer Deactivate the internal electronic keyer in keyer set mode p 34 TUNER CONTROL SOCKET TUNER pgs 15 77 Accepts the control cable from an optional AH 4 HF 50 MHz AUTOMATIC ANTENNA TUNER 4 f you use an external electronic keyer make sure the voltage retained by the keyer is less Y than 0 4 V when the key is ON CALIBRATION POT CAL p 94 This is used for frequency calibration e The transceiver has been adjusted and calibrated thor oughly at the factory Under normal circumstances the frequency does not need to be re calibrated GROUND TERMINAL GND pgs 13 14 Connect this terminal to a ground to prevent electri cal shocks TVI BCI and other probl
93. eral times to set the pre amp OFF preamp 1 ON or preamp 2 ON PAMP P AMP or P AMP appears when the preamp 1 preamp 2 or preamp is set to ON respec tively depending on operating frequency band Push P AMP ATT for 1 sec to set the attenuator ON e Push P AMP ATT momentarily to turn the attenuator OFF e ATT appears when the attenuator is set to ON e Noise blanker p 51 Push NB to turn the noise blanker ON and OFF e NB appears when the noise blanker is set to ON e Push NB for 1 sec to enter noise blanker set mode Convenient functions for transmit e Transmit quality monitor p 57 Push MONITOR to turn the monitor function ON and OFF e MONI appears when the monitor function is set to ON TRANSMIT TX indicator _ Band keys CW RTTY Tuning dial RTTY or RTTY R appears e Noise reduction p 53 Push NR to turn the noise reduction ON and OFF e Rotate NR control to adjust the noise reduction level e NR appears when the noise reduction is set to ON e Twin PBT passband tuning p 52 Rotate TWIN PBT controls inner outer e Push PBT C to clear the settings e AGC auto gain control p 49 While is selected with MENU push AGC M AGC amp or AGC OFF e 1 4 function p 21 While fii is selected with MENU push F3 4
94. erience interference to other electronic devices such as the telephone television or stereo audio systems e f you are not using the PS 125 Connect the supplied DC power cable OPC 025D to the appropriate color coded terminals then insert the DC connector into the DC jack located on the rear of the radio AC ADC power to DC power outlet supply a socket a Transceiver w WU ag om Supplied DC power cable 13 8 V at least 23 A 30 A fuses continuous 4 NOTE Although the power supply current require ment is quite low during receiving this not the case when you transmit With many electrical devices in Y the shack it is very important to verify the electrical circuit is not overloaded 3 Installing lightning protection Although you may not live in an area with high occur rence for lightning storms it is always wise to take precautions for lightning or static discharges Proper lightning protection not only offers protection to the ham gear but the shack and most importantly the op erator 4 Installing your antenna system Whether your IC 746PRO is your first radio or one of many one of your key elements in a great shack is the antenna system There are three connections on the back of your IC 746PRO two for HF and 6 m and one for 2 m If you are using one antenna for HF and 6 m for simplicity connect the antenna coa
95. eyer are set using the edit menu e Transmitting 1 While fi1 is selected in CW mode push F4 p to select the memory keyer menu 2 Push F2 5HE to select the keyer send menu 3 Push TRANSMIT to set the transceiver to trans mit or set the break in function ON p 56 4 Push one of the function keys F1 to F4 to send the contents of the memory keyer e Pushing a function key for 1 sec repeatedly sends the contents push any function key to cancel the transmis sion e The contest number counter above F5 is incremented each time the contents are sent e Push F5 to reduce the contact number count by 1 when resending contents to unanswered calls 4 For your information 4 Nhen an external keypad is connected to the Y pin 3 and pin 7 of the MIC connector the pro Y grammed contents Mi M4 can be transmitted Z without selecting the keyer send menu 4 See p 87 for details 5 Push MENU 2 times to return to fii M1 send indication RECEIVE AND TRANSMIT M2 send indication cm Repeat send indication fered M2 send indication Repeat indicators M3 send indication Count up trigger a i Counter indicator M4 send indication 4 30 31 4 RECEIVE AND TRANSMIT Editing a memory keyer The contents of the memory keyer memories can be set using the memory keyer edit menu The memory keyer can memorize and re transmit 4 CW key codes for often used CW sen
96. frequency e After setting up WE Quick split function When you push the SPLIT switch for 1 sec split fre quency operation is turned ON the undisplayed VFO is automatically changed according to the plus minus shift frequency programmed in set mode p 83 or equalized when 0 kHz default value is programmed as the split shift frequency Quick split operation is turned ON by default but can be turned OFF in set mode p 83 1 Suppose you are operating at 21 290 MHz USB in VFO A 2 Push SPLIT for 1 sec e Split frequency operation is turned ON e The VFO and VFO B are equalized 3 While pushing XFC rotate the tuning dial to set the frequency offset between transmit and receive eWhen XFC is released the receive frequency is indi cated Q Split offset frequency setting By setting an often used split frequency offset in ad vance you can use the quick split function to select split operation at the push of one switch Set the split offset frequency in advance in set mode p 83 item 12 The example at right shows the split offset is set to 0 020 MHz Push SPLIT for 1 sec to activate the quick split function e The transmit frequency is offset from the receive fre quency according to the offset in set mode Split lock function The split lock function is convenient for changing only the transmit frequency When the split lock function is not used accidentally releasing XFC while rota
97. from 4 transmission without an antenna Make sure you U have an antenna connected whenever you trans Y mit with your radio KN AAAAQGQGGA MW NOTE There are many publications covering proper antennas and their installation check with your local dealer for more information and recom mendations QUICK REFERENCE GUIDE 5 Connect other peripheral equipment Everyone has his or her favorite ad on gear now is lf you do not see the particular item you are wanting the time to connect this gear We will cover the basic to connect refer to the Advance Connections section devices that can be connected to your IC 746PRO starting on page 15 E Operation 1 Voice Microphones Connect the microphone to the eight pin connector on the front of the radio UU UU 0090s JOU Joga UO 0U Z A On 0 D D D Q 2 CW CW Key There are several types of keys or keyers b Straight Key Use a 6 35 d mm 1 4 mono plug that can be used with your IC 746PRO and connect key to the back of the radio c External Keyer Use a 6 35 d mm 14 mono a lambic Key paddle Use a 6 35 d mm 14 stereo plug and connect to the back of the radio plug and connect to the ELEC KEY jack located d Computer Keying Use a 6 35 d mm 14 mono on the front of the radio plug and connect to the back of the radio il
98. func tion and turn the tuner OFF This function activates the tuner automatically when the SWR exceeds 1 5 1 This function is turned ON in set mode p 84 ePTT TUNER START The tuner is always tuned when the PTT is pushed after the frequency is changed more than 1 from last tuned frequency This function removes the push and hold TUNER operation and activates for the first transmission on a new frequency This function is turned ON in set mode p 84 e Antenna tuner of the IC PW1 When using an external antenna tuner such as the IC PW1 s tuner tune with the external antenna tuner while the internal tuner is turned OFF After tuning is completed turn the internal tuner ON Otherwise both tuners tune simultaneously and correct tuning may not be obtained See the instruction manual included with each an tenna tuner for their respective operations ANTENNA TUNER OPERATION TUNER 9 76 T1 9 ANTENNA TUNER OPERATION E Optional external tuner operation AH 4 HF 50 MHz AUTOMATIC ANTENNA TUNER The AH 4 matches the IC 746PRO to a long wire an tenna more than 7 m 23 ft long 3 5 MHz and above e See the AH 4 instruction manual for AH 4 installation and antenna connection details NEVER operate the AH 4 without an antenna wire The tuner and transceiver will be damaged NEVER operate the AH 4
99. g contents 1 Push MENU to select 14 then push F4 piz to select the memory keyer menu 4 Set the desired condition using the tuning dial e Push F3 for 1 sec to select a default condition or value 5 Push MENU 2 times to return to fii Set item up down This item sets the CW side tone output level e0 to 100 in 1 steps can be selected item sets the CW side tone level limit When the AF control is rotated above a specified level the CW side tone does not increase CW side tone level is limited default CW side tone level is not limited 3 peli gn mri When sending CW using the repeat timer this item sets the time between transmission e1 to 60 sec in 1 sec steps can be selected 4 Pite Diash Faki This item sets the dot dash ratio e 1 1 2 8 to 1 1 4 5 in 0 12 steps can be selected Keying weight example Morse code K DOT fixed Weight setting DASH DASH 1 1 3 default Weight setting SPACE and DOT length can be Adjusted one adjusted with KEY SPEED only Adjustable range Sy 9 fps Tims This item sets the envelop time period which the out put power becomes the set transmit power e2 4 6 or 8 msec can be selected e About rise time TX Key action Rx Tx output power Lf Set Tx power level Rise time This item sets the paddle polarity e Normal and reverse polarity can be selected 7 eee Telus This item selects the keyer type for
100. h and Japan ese as the language Announces in English default Announces in Japanese See p 90 for unit installation 02 VOICE SYNTHESIZER UNIT S installed you can select between faster or slower synthesizer output Announces faster default Announces slower See p 90 for unit installation 25 PE yb Sej ae F When the optional UT 102 VOICE SYNTHESIZER UNIT S installed you can have frequency mode and signal level announcement Signal level announcement can be deactivated if desired Announces operating frequency mode and receiving signal level default Announces operating frequency and mode only See p 90 for unit installation 26 Meer nd Pied Lr This item sets the number of memo pad channels available 5 or 10 memo pads can be set E General set mode continued This item sets the auto tuning step function When ro tating the tuning dial rapidly the tuning step automat ically changes several times as selected There are 2 type of auto tuning steps HIGH Fastest and LOW Faster Auto tuning step is turned ON Approx 5 times fastest tuning step during rapid rotation default Auto tuning step is turned ON Approx 2 times faster tuning step dur ing rapid rotation Auto tuning step is turned OFF This item sets the r scanned when the microphone UP DN switches are pushed and held High or low can be selected High speed default 50 tuning steps sec Lo
101. he quick split function The offset frequency can be set from 9 999 MHz to 9 999 MHz in 1 kHz steps 13 When this item is ON the tuning dial can be used to adjust the transmit frequency while pushing XFC even while the dial lock function is activated Split lock function ON Split lock function OFF default 14 3 This it item sets the ae ieee between transmit and receive frequencies for duplex operation How ever this setting is used to input the repeater offset for an HF band only The offset frequency can be set from 0 000 MHz to 9 999 MHZ in 1 kHz steps 15 This it item sets the offset iane between transmit and receive frequencies for duplex operation How ever this setting is used to input the repeater offset for a 50 MHz band only The offset frequency can be set from 0 000 MHz to 9 999 MHz in 1 kHz steps 16 This it item sets the ae difference between transmit and receive frequencies for duplex operation How ever this setting is used to input the repeater offset for a 144 MHz band only The offset frequency can be set from 0 000 MHz to 9 999 MHz in 1 kHz steps E General set mode continued This item turns the one touch repeater function ON DIE or LIF and OFF When F2 fi is pushed for 1 sec in fii the se lected offset direction and the programmed duplex offset frequency depending on the operating fre quency band is set with the displayed frequency 18 Bihan
102. he transceiver s repeater tone frequency is set to 88 5 Hz by default This can be changed if desired 1 While ff is selected push F4 T 4 to turn the tone encoder ON e T appears 2 Push F4 Te for 1 sec to select the tone fre quency set mode 3 Push F1 tH several times to select Rgt y Derren If necessary 4 Rotate the tuning dial to select the desired fre quency see the table at right 5 Push MENU to return to fii Storing a non standard repeater Turn the auto repeater function OFF in the set mode p 84 2 Push AM FM to select FM mode 3 Push V M then A B to select VFO A 4 Rotate the tuning dial to set the repeater output fre quency e Set the tuning step if desired 5 Push A B to select VFO B 6 Rotate the tuning dial to set the repeater input fre quency 7 Push A B to select VFO A Push SPLIT to turn the split function ON 9 Push F4 f 4 to turn the previously set tone en coder ON Rotate M CH to select the desired memory chan nel e BLANK appears when a blank channel is selected d Push MW for 1 sec to store the contents in the se lected memory channel ec gt O XN XQ ae oe ee cae ee ee Ce 20 m OOOO e Available tone frequencies Unit Hz Biaaw gt O 165 5 186 2 210 7 254 1 167 9 189 9 171 3
103. he transmit filter width for SSB mode can be selected from wide middle and narrow 1 Select USB or LSB mode 2 Push Lidia to select fii if necessary 3 Push F4 TE for 1 sec w select the transmission te width ab ie PT e se Et dexfed T Py or re eOne i ve eppoi Lih peim ig AE or Approx 1 sec Transmit filter width NAR 2 2 KHz MID 2 4 kHz WIDE 2 8 kHz Push F4 J es IL The selected transmit filter width is displayed for approx 1 sec Push F4 for 1 sec to select the transmit filter width 6 58 59 6 FUNCTIONS FOR TRANSMIT E Split frequency operation Split frequency operation allows you to transmit and receive in the same mode on two different frequencies The split frequency operation is basically performed using 2 frequencies in VFO A and VFO B The following is an example of setting 21 290 MHz for receiving and 21 310 MHz for transmitting M Set 21 290 MHz USB in VFO A 2 Push SPLIT to turn the split function ON then push A B for 1 sec e The equalized transmit VFO B frequency and SPLIT appear on the LCD and the SPLIT indicator lights 3 While pushing XFC rotate the tuning dial to set the transmit frequency to 21 310 MHz e The transmit frequency can be monitored while pushing XFC 4 Now you can receive on 21 290 MHz and transmit on 21 310 MHz To change the transmit and receive frequencies push A B to exchange the VFO A and VFO B
104. however this can be increased to 10 in set mode if desired p 85 Writing frequencies and operating modes into memo pads Push MP W to store the displayed frequency and NOTE Each memo pad must have its own unique operating mode into a memo pad combination of frequency and operating mode e Each push of MP W stores a frequency and mode into memo pads having identical settings cannot be writ the next available memo pad when you write a 6th or ten 11th frequency and operating mode the oldest written frequency and operating mode are automatically erased to make room for the new settings e Displayed frequency and mode e Stored in next available memo pad In this example pushing MP W enters 21 28000 MHz USB into the top memo pad and erases the oldest memo pad 21 34724 MHz LSB Erased Q Recalling a memo pad Push MP R to recall a memo pad e Each push of MP R recalls a memo pad starting from the most recently written e VFO or memory mode e Memo pads 68 E 69 SCANS E Scan types PROGRAMMED SCAN Repeatedly scans between two scan edge frequencies scan edge memory channels P1 and P2 Scan edge P2 or P1 Scan edge P1 or P2 This scan operates in VFO mode MEMORY SCAN Repeatedly scans all programmed memory channels SEL This scan operates in memory mode E Preparation e Channels For programmed scan Program scan edge frequencies into scan edge mem o
105. is faster Push F2 to select SEAH Fesume item Rotate the tuning dial to select scan resume func Ce Ne Se tion from ON and OFF T eH when detecting a signal scan pauses for 10 sec then resumes When a signal disap pears scan resumes 2 sec later oo e ETE when detecting a signal cancels scanning hi iL ri igi Push MENU to return to scan menu eee wii eee f Push F1 or F2 ee E a T 71 8 SCANS E Programmed scan Fine programmed scan VFO mode Programmed scan searches for signals between scan edge memory channels P1 and P2 The default fre quencies for these memories are 0 500000 MHz and 29 99999 MHz respectively See p 66 for scan edges programming 1 Push V M to select VFO mode if necessary 2 Select the desired operating mode e The operating mode can also be changed while scan ning 3 Push TS to select a tuning step e The tuning step can also be changed while scanning 4 Push MENU to select ft 5 Push F1 H to select the scan menu e See p 69 for scan condition elf the RF SQL control function is set as AUTO the squelch is always open in SSB CW and RTTY modes e The MHz and kHz decimal points blink while scanning 7 When the scan detects a signal the scan stops pauses or ignores it depending on the resume VSC setting and the squelch condition To cancel the scan push F1 Fi e Rotating the tuning dial during scan also ca
106. l allow you to dial in the frequency you want to oper ate You will notice the tuning speed TS is 10 Hz res olution Page 22 will instruct you on how to set the tuning speed TS for 1 Hz resolution You IC 746PRO has three antenna connectors Two for HF and 6 m and a one for 2 m The selection for 2 m is automatic where the HF and 6 m is user se lectable for either one of the antenna jacks For first time use the antenna selector should show BY on the display of your radio Verify the antenna selected on the display is the antenna port your antenna is connected to 4 Adjust audio output Adjust this control to a comfortable audio level eSay you want to go to 20 meters or 14 MHz you would push the 14 5 This will immediately change the displayed operating frequency to the 20 meter band By pushing 14 5 again frequency pre sets in the triple band stacking registers frequency can be displayed For more details on this system refer to p 19 NOTE Although you can directly enter the fre quency with the keypad using the Band Stacking Register and the tuning knob is the most popular method of hoping around the bands For more in formation regarding the direct frequency entry method refer to p 22 SS im ae Dm Ai a Ma fp P
107. level can be set in 3 Bisse j myu p 81 7 busine bunk Eke A beep sounds when an operating frequency enters or exits an amateur band This functions independent of the confirmation beep setting above Band edge beep ON default Band edge beep OFF The volume level can be set in 3 Fimgp f grymm p 81 Q keks eir y The RF SQL control can be set as the RF squelch control default the squelch control only RF gain is fixed at maximum or Auto RF gain control in SSB CW and RTTY squelch control in AM and FM RF SQL control as RF squelch con trol default RF SQL control as squelch control RF SQL control as RF gain control in SSB CW and RTTY squelch con trol in AM and FM 9 Peber Peak Hold This item turns the meter peak hold function ON and OFF When set to ON default peak meter readings are displayed for about 0 5 sec 10 CEPE Peder This item turns the COMP meter indication ON and OFF during transmit When set to ON the COMP meter is displayed instead of the SWR meter default OFF SET MODE 11 82 11 SETMODE E General set mode continued 11 When this item i is set to ON pushing SPLIT for 1 sec sets the transmit frequency pe ane si A vey and the split offset set in T item below and activates the split e au Te Quick split ON default Quick split OFF 12 T This item sets the ares Giferenes between transmit and receive frequencies for t
108. lity covering 160 2 m e 100 Watt continuous duty cycle e All mode digital modulation and demodulation eRTTY demodulator and decoder e Twin Pass Band Tuning e RF speech compression with selectable pass band e Microphone Equalizer SSB CW synchronous tuning IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver SAVE THIS INSTRUCTION MANUAL This manual contains important safety and operating in structions for the IC 746PRO EXPLICIT DEFINITIONS woro DEFINITION Personal injury fire hazard or electric A WARNING shock may occur CAUTION Equipment damage may occur If disregarded inconvenience only No NOTE risk or personal injury fire or electric shock PRECAUTIONS A WARNING RF EXPOSURE This device emits Radio Frequency RF energy Extreme caution should be observed when operating this device If you have any questions regarding RF exposure and safety standards please refer to the Federal Communications Commission Office of Engineering and Technology s report on Evalu ating Compliance with FCC Guidelines for Human Radio Frequency Electromagnetic Fields OET Bulletin 65 A WARNING HIGH VOLTAGE NEVER attach an antenna or internal antenna connector during transmis sion This may result in an electrical shock or burn A NEVER apply AC to the DC13 8V jack on the trans ceiver rear panel This could cause a fire or ruin the trans ceiver A NEVER app
109. ly more than 16 V DC such as a 24 V battery to the DC13 8V jack on the transceiver rear panel This could cause a fire or ruin the transceiver A NEVER let metal wire or other objects touch any in ternal part or connectors on the rear panel of the trans ceiver This may result in an electric shock NEVER expose the transceiver to rain snow or any liquids AVOID using or placing the transceiver in areas with tem peratures below 10 C 14 F or above 60 C 140 F Be aware that temperatures on a vehicle s dashboard can exceed 80 C 176 F resulting in permanent damage to the transceiver if left there for extended periods AVOID placing the transceiver in excessively dusty envi ronments or in direct sunlight AVOID placing the transceiver against walls or putting anything on top of the transceiver This will obstruct heat dissipation Place unit in a secure place to avoid inadvertent use by children During mobile operation DO NOT operate the transceiver without running the vehicle s engine When the trans ceiver s power is ON and your vehicle s engine is OFF the vehicle s battery will soon become exhausted Make sure the transceiver power is OFF before starting the vehicle This will avoid possible damage to the trans ceiver by ignition voltage spikes During maritime mobile operation keep the transceiver and microphone as far away as possible from the magnetic navigation compass to prevent erro
110. make sure the following controls are set in the fol a brand new radio some settings may be changed lowing positions from the factory defaults during the QC process So your radio can start from Factory Defaults resetting A Tae the CPU is necessary POWER F INP M CL ee S 4 F O O O O O O O O IGJ AF Commonly referred to as the vol O ume fully counter clockwise e NR The noise reduction control fully a counter clockwise e MIC GAIN The mic gain fully counter clock wise e RF SQL The control for the RF Gain and Squelch circuits 12 o clock e CW PITCH The control for the CW pitch 12 o clock e KEY SPEED Internal CW Keyer Speed fully counter clockwise e NOTCH Control for the manual notch 12 o clock QUICK REFERENCE GUIDE Just listening 1 Select the desired band On your IC 746PRO an easy way of changing bands is by using the keypad located just above the tuning knob on the right hand side of the display You will no tice each switch has two sets of numbers one set of numbers represents the band selection 7 O Ja oe 2 Tune to the desired frequency Directly below the keypad is the tuning knob This wil
111. mory 63 E Frequency calibration approximate E VFO operation susina 20 M Memory clearing e e E E E 94 E Frequency Setting ceeeee 21 E Selecting the call channel 64 E Operating mode selection 23 E Programming the call channel 64 14 CONTROL COMMAND 95 99 E Volume setting eee eeeee 23 E Frequency transferring 65 E Remote jack CI V information 95 E Squelch and receive RF E Programming scan edges 66 SEMSILIVILY o seeseeeseeseesnertesneenteeteettens 24 E Assigning memory names 67 15 SPECIFICATIONS csesee 100 E Basic transmit operation 25 E Memo pads n se 68 16 OPTIONS wisiccitiretaccstecsacceschevtecacien 101 4 RECEIVE AND TRANSMIT 26 46 8 SCANS nuninnnirarikinnra 69 74 E Operating SSB n s 26 E Scan types 0 00 ccececeteeeteeeteeeeeeees 69 E Operating OW o n 27 MI Preparation ccccceccseceteeeeeeees 69 SUPPLIED ACCESSORIES The transceiver comes with the following accessories D TITAS 1 DC power cable OPC 025D 2 Hand microphone HM 36 3 Spare fuses FGB 30 A 4 Spare fuse FGB 5 A CW keyer plug AP 330 Icom Icom Inc and the com logo are registered trademarks of Icom Incorporated Japan in the United States the United King dom Germany France Spain Russia and or other countries MM QUICK REFERENCE GUIDE E Installatio
112. mple display when inputting QSL TU DE JA3YUA TEST into MS Contest number set mode This menu is used to set the contest serial number and count up trigger etc e Setting contents Push MENU to select F4 then push F4 isim to select the memory keyer menu 4 Set the desired condition using the tuning dial e Push F3 for 1 sec to select a default condition or value 5 Push MENU 2 times to return to fii This item sets the numbering system used for contact serial numbers normal or morse cut numbers Does not use morse cut number default Sets 1 as A 9 as N and 0 as O Sets 1 as A 9 as N and 0 as T Sets 9 as N and 0 as O Sets 9 as N and 0 as T This selects which of the four memory slots will have the contest serial number exchange The count up trigger allows the serial number to e automatically in cremented after each complete serial number ex change is sent eM1 M2 M3 and M4 can be set default M2 3 Eime amne bab g mhen This item shows the current number for the count up trigger channel set above e Rotate the tuning dial to change the number or push F3 i Fe for 1 sec to reset the current number to 001 RECEIVE AND TRANSMIT Set item up down 4 32 33 4 RECEIVE AND TRANSMIT Keyer set mode This set mode is used to set the CW side tone mem ory keyer repeat time dash weight paddle specifica tions keyer type etc e Settin
113. n 1 Install a ground system for DC noise suppression and RFI suppression 2 Install your DC power supply 3 Install lightning protection This will help protect more than your gear 4 Install and connect an antenna system for the ap propriate bands of operation 5 Connect other peripheral equipment This includes microphones headsets TNC amplifiers and any other equipment necessary to make your shack 1 Grounding your Shack Although your radio will operate by connecting the DC power supply and antenna it is necessary to have a good ground system in your shack A ground connec tion is the electrical contact between the common point of an electrical or electronic system and the earth A good earth ground is necessary to prevent electrical shock eliminate problems from RFI and DC noise With more electronic devices being used today it is also important to reduce RFI and EMI Although you may not see interference in your shack without a grounding system your neighbors may experience in terference Even though many of these devices are Part 15 where they must accept interference from their Surrounding environment it is best to eliminate as much of the possible interference from your shack If you do not have a grounding system for your shack depending on the location of your shack basement or ground floor a good ground system can be as simple as a couple of ground rods driven 6 to 8 feet into the soil When installing
114. n O OFF 1 ON 2 Start tuning or while tuning Band stacking register To send or read the desired band stacking register s con tents combined code of the frequency band and register codes as follows are used For example when sending reading the oldest contents in the 21 MHz band the code 0703 is used e Frequency band code 144 000000 148 000000 Other than above 3 oldest CONTROLCOMMAND 14 Codes for memory keyer contents To send or read the desired memory keyer contents the channel and character codes as follows are used e Channel code e Character s code oo 30 39 Numerals gt 2C _ _ Symbol gt gt 2 Symbol e g to send BT enter 4254 2A Inserts contact number can be used for 1 channel only Codes for memory name contents To send or read the desired memory name settings the char acter codes instructed codes for memory keyer contents as above and follows are additionally used e Character s code Alphabetical characters ASCI code ASCII code e Character s code Symbols ASCII code Character ASCII code 9 gt a a A 2 o amp a ae ee ae O o S 7 t B pA ee ee D p gt E OR 1 D P o 2 3 3 3 5 7 7E 21 24 26 3F 27 B A D E 29 D D 5F 98 99 14 CONTROL COMMAND Split Duplex frequency setting The following data sequence is used when
115. n control Squelch is fixed open SSB CW RTTY only Adjusting RF gain Receive sensitivity Normally RF SQL is set to the 11 o clock position X a Maximum Rotate RF SQL to the 11 o clock position for maxi RF gain mum sensitivity l 7 Adjustable e Rotating counterclockwise from the maximum position re range A duces sensitivity e The S meter indicates receive sensitivity e y x Minimum RF gain eWhen functioning as squelch control RF gain is Adjusting squelch Removing non signal noise fixed at maximum Rotate RF SQL clockwise when receiving no signal Noise squelch FM mode ma i Noise squelch until the noise just disappears threshold e RX indicator light goes out FM mode S meter squelch ie threshold e Rotating RF SQL past the threshold point invokes the S meter squelch this allows you to set a minimum signal level needed to open the squelch Squelch is open S meter squelch Shallow 25 3 BASIC OPERATION E Basic transmit operation Transmitting Before transmitting monitor your selected operating frequency to make sure transmitting won t cause inter ference to other stations on the same frequency Push TRANSMIT or PTT microphone to trans mit e The TX indicator lights red 2 Push TRANSMIT again or release PTT micro phone to return to receive Microphone gain adjustment Before transmitting monitor your sele
116. ncels scan operation scan edge memory channel P1 and P2 pro f If the same frequencies are programmed into the grammed scan does not start About the Fine programmed scan During programmed scan when a signal is received scan continues but the tuning step is temporarily set to 10 HZ 1 Follow steps to above to start programmed scan 2 During programmed scan push F3 Ti to switch between programmed scan and fine programmed scan operation 3 Push F1 477 to cancel the scan e Rotating the tuning dial during scan also cancels scan operation TS V M e 15 oes ame eee llr CO OVJ eJ C2 e CD E E E Push F1 l Push F1 esesee ann eeeeeee ph ee eee eo ew mie PU PR LELERTE EL pei N we S ll S Dyke NANN NN pee e ree peee p oe Push F1 to start cancel the scanning NN eN AN eN elel eea ael Eme prm ae Tmn EmN i i pelbeb Eber Ded BER mT hh A Fah NNN NN peg g eee eee an p Push F3 to switch between programmed scan and fine pro grammed scan NENN AN eN eN l aelel eaaa aaa Be PORGERE C i BE te Ba Fae ee ee AN ee oe a A ap SCANS E Memory scan operation Memory mode Memory scan searches through memory channel 1 to 99 for signals Blank unprogrammed memory chan nels are skipped 1 Push V M to select memory mode if necessary 2 Push MENU
117. nction ON and OFF e MONI appears when the monitor function is set to ON e Audio tone control p 89 While fi is selected with MENU push F4 rotate the tuning dial to adjust the audio tone 40 41 4 RECEIVE AND TRANSMIT E Operating FM 1 Push a band key to select the desired band 2 Push AM FM to select FM 3 Rotate AF to set audio to a comfortable listening level 4 Rotate the tuning dial to tune a desired signal S meter indicates received signal strength Push TRANSMIT or PTT microphone to trans mit e The TX indicator lights red 6 Speak into the microphone at your normal voice level e Adjust MIC GAIN at this step if necessary T Push TRANSMIT or release PTT microphone to return to receive Convenient functions for receive e Preamp and attenuator p 48 Push P AMP ATT several times to set the pre amp OFF preamp 1 ON or preamp 2 ON PAMP P AMP or PMP appears when the preamp 1 preamp 2 or preamp is set to ON respec tively depending on operating frequency band Push P AMP ATT for 1 sec to set the attenuator ON e Push P AMP ATT momentarily to turn the attenuator OFF e ATT appears when the attenuator is set to ON e Noise blanker p 51 Push NB to turn the noise blanker ON and OFF e NB appears when the noise blanker is set to ON e Push NB for 1 sec to enter noise blanker set mode
118. neous indications BE CAREFUL The heatsink will become hot when oper ating the transceiver continuously for long periods BE CAREFUL If a linear amplifier is connected set the transceiver s RF output power to less than the linear am plifiers maximum input level otherwise the linear ampli fier will be damaged Use Icom microphones only supplied or optional Other manufacturer s microphones have different pin assign ments and connection to the IC 746PRO may damage the transceiver TABLE OF CONTENTS FOREWORD ccccecccccccccccccccecccnccccccescencuss i E Electronic keyer functions 29 E Voice squelch control function 70 IMPORTANT cocccccccccccccccccccccccccececcccceceee i E Operating RTTY PSK nien 35 E Scan set mode keeten 70 EXPLICIT DEFINITIONS l E RTTY functions AE EEE E EN 36 E Programmed scan Fine programmed E Operating AM ccceeeeeeeeeeeeeees 40 E 0 eee ee ener ne re errr etre er 71 PRECAUTIONS sssssssssssssesseeeseeneens l E Operating FM ccccccsseeeeeeeeeees 41 E Memory scan operation 72 TABLE OF CONTENTS osasin ii E Repeater operation cc ccee 44 E Select Memory SCAN ns 72 E AF scan operation and Fine AF scan QUICK REFERENCE GUIDE I X FUNCTIONS FOR RECEIVE _ _________vneaasststsesesetscecscscsesesesesesececacatseseeees 73 MM Installation 2 0 0 ceeececesesseeeeeeeeeeeeees Be eee ee eee 47 54
119. nnna 81 89 E OUNi enama VO 55 61 E General set mode 000 0ee 81 W Antenna Connection 13 E VOX function 0 eect 55 E Tone control set mode 89 W Required connections 4 14 E Break in function oine 56 W Advanced connections 15 M ATX function oeiee 57 12 OPTION INSTALLATION 90 91 E Power supply connections 16 E Monitor function 0 cee eee eee 57 WE Opening the transceiver s case 90 E Linear amplifier connections 17 E Speech compressor nu 58 E UT 102 VOICE SYNTHESIZER UNIT 90 E External antenna tuner E Transmit filter width selection 58 E CR 338 HIGH STABILITY CRYSTAL UNIT CONNECTIONS sseeeeeeeeeee tees etetees 17 E Split frequency operation Se eee ee eee 91 W Quick split function 008 60 3 BASIC OPERATION 18 25 E Measuring SWR noosa 61 13 MAINTENANCE cseee0ee 92 94 E When first applying power E Trouble shooting cccccceceeeee 92 CPU resetting cccccseeseeeeeeees 18 7 MEMORY OPERATION 62 68 E Fuse replacement 0 c c0e eee 93 MM Initial settings ce eeeeee ee eeees 18 E Memory channels esese e 0 0 62 E Tuning dial brake adjustment 93 E Selecting an operating band 19 E Memory channel selection 62 E Resetting the CPU 94 E Selecting VFO memory mode 20 E Programming a me
120. nt drain 25 A SM 20 DESKTOP MICROPHONE Unidirectional electret microphone for base station operation Includes UP DOWN switches and a low cut function UT 102 VOICE SYNTHESIZER UNIT Announces the receive frequency mode and S meter level in a clear electroni cally generated voice in English or Japanese SP 20 EXTERNAL SPEAKER 4 audio filters headphone jack can con nect to 2 transceivers e Input impedance 8 Q e Max input power 5 W CR 338 HIGH STABILITY CRYSTAL UNIT Contains a temperature compensating oven heater and crystal unit for improved frequency stability e Frequency stability 0 5 ppm HM 36 HAND MICROPHONE Hand microphone equipped with UP DOWN switches Ceunt en us A 6085H 1US Icom Inc Printed in Japan a er 2001 2002 Icom Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan
121. o select the default value Push MENU to return to previous indication Appears oe ee gain a rene o o gain E a ee delay E Break in function The break in function is used in CW mode to automat ically toggle the transceiver between transmit and re ceive when keying The IC 746PRO is capable for full break in or semi break in Semi break in operation During semi break in operation the transceiver selects transmit when keying then automatically returns to re ceive after a pre set time from when you stop keying Push CW RTTY to select CW or CW R mode 2 Push VOX BK IN several times to turn the semi break in function ON BK IN appears 3 Set the break in delay time the delay from transmit to receive Push VOX BK IN for 1 sec to select break in delay program mode Rotate the tuning dial to select the desired delay e Push F3 for 1 sec to select to the default value 4 Push MENU to return to the previous menu 4 Nhen using a paddle rotate KEY SPEED to adjust YU the keying speed Q Full break in operation During full break in operation the transceiver automati cally selects transmit while keying and returns to receive immediately after keying is finished Push CW RTTY to select CW or CW R mode 2 Push VOX BK IN several times to turn the full break in function ON BK IN ap
122. old set O OFF 1 ON Send read COMP meter set O OFF 1 ON Send read quick split set O OFF 1 ON Send read split offset 9 999 to 9 999 MHz see p 98 for details Send read split lock set O OFF 1 ON Send read duplex offset 0 000 to 9 999 MHz for HF see p 98 for details Send read duplex offset 0 000 to 9 999 MHz for 50 MHz band see p 98 for details Send read duplex offset 0 000 to 9 999 MHz for 144 MHz band see p 98 for details 96 14 CONTROL COMMAND e Command table continued 97 Send read one touch repeater set O DUP 1 DUP Send read auto repeater set O OFF 1 ON 1 2 ON 2 Send read tuner auto start set O OFF 1 ON Send read PTT tune set O OFF 1 ON Send read 9600 bps mode set O OFF 1 ON Send read antenna selection O OFF 1 Manual 2 Auto Send read speech language O English 1 Japanese Send read speech speed 0 Slow 1 Fast Send read S level speech O OFF 1 ON Send read memo pad numbers O 5 ch 1 10 ch Send read main dial auto TS O OFF 1 Low 2 High Send read mic up down speed O Low 1 High Send read quick RIT ATX clear function O OFF 1 ON Send read PBT shifting value popup set O OFF 1 ON Send read IF filter width popup set O OFF 1 ON Send read SSB CW synchronous tuning function O OFF 1 ON Send read CW normal side set O LSB 1 USB Send read keyer 1st menu set O Keyer root 1 Keyer send Send read external keypad set O OFF 1 Keye
123. om the DSP unit and does not Y indicate an equipment malfunction OK MIC GAIN CONTROL MIC GAIN Adjusts microphone input gain e The transmit audio tone in SSB AM and FM modes can be adjusted in tone control set mode p 89 How to set the microphone gain Set the MIC control so that the ALC meter sometimes swings during normal voice transmission in SSB mode Make sure that voice peak readings do not exceed the ALC range brackets on the meter Recommended level for an Icom microphone Decreases 1 Increases MIC GAIN AF CONTROL AF inner control Varies the audio output level from the speaker AF RF SQL RF POWER CONTROL RF PWR Continuously varies the RF output power from min imum less than 5 W to maximum 100 W AM mode less than 5 W to 40 W Decreases Increases RF PWR PANEL DESCRIPTION 1 CW PITCH CONTROL CW PITCH p 28 Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating fre quency e The pitch can be changed from 300 to 900 Hz in approx 25 Hz steps Decreases f Increases CW PITCH ELECTRONIC CW KEYER SPEED CONTROL KEY SPEED p 28 Adjusts the internal electronic CW keyer s speed e6 wpm min to 60 wpm max can be set Slow Fast KEY SPEED AUTO NOTCH MANUAL NOTCH SWITCH E NOTCH p 53 Toggles the notch function between manual and au tomatic when pushed e NOTCH appears when manual
124. onnectors for the HF 50 MHz bands ANT1 and ANT2 and 1 antenna connector for the 144 MHz band a total of 3 antenna connectors For each operating band the IC 746PRO covers there is a band memory which can memorize a selected an tenna When you change the operating frequency be yond a band the previously used antenna is automat ically selected See below for the new band This function is convenient when you use 2 antennas for HF and 50 MHz bands operation eAntenna select function Auto Once an antenna has been selected for use with a 144 MHz 21 28 50 MHz 3 5 7 MHz band by pushing ANT the antenna is automatically selected whenever that band is accessed EXAMPLE a 3 5 7 MHz antenna is connected to ANT 1 a 21 28 50 MHz antenna is connected to ANT2 When the antenna selector function is set to Auto an antenna is automatically selected when Bed changing bands ALL s 00 U Joo 00 e Antenna select function Manual When Manual is selected you can use the ANT 1 144 MHz band 50 MHz band HF bands and ANT2 however band memory does not func tion In this case you must select an antenna manu ally However the 144 MHz antenna will still be selected automatically EXAMPLE an optional antenna tuner and HF an tenna are connected to ANT1 and a 50 MHz an Boa tenna is connected to ANT2 N
125. pears When using a paddle rotate KEY SPEED to adjust the keying speed FUNCTIONS FOR TRANSMIT Break in indicator Shows break in delay time Full break in indicator 6 56 6 FUNCTIONS FOR TRANSMIT E ATX function The ATX function shifts the transmit frequency up to 9 99 kHz in 10 Hz steps without moving the receive frequency e See on p 4 for function description 1 Push the ATX switch to turn the ATX function ON and OFF e ATX and shift frequency appear when the function is ON 2 Rotate the RIT ATX control e To reset the ATX frequency push CLEAR for 1 sec e Push CLEAR momentarily to reset the ATX frequency when the quick RIT clear function is ON p 86 e To add or subtract the ATX frequency to the displayed frequency push ATX for 1 sec Nhen RIT and ATX are ON at the same time the Y RIT ATX control shifts both the transmit and re Y ceive frequencies from the displayed frequency at 4 the same time ON ATX monitor function When the ATX function is ON pushing and holding XFC allows you to monitor the operating frequency di rectly ATX is temporarily cancelled E Monitor function The monitor function allows you to monitor your trans mit IF signals in any mode through the speaker Use this to check voice characteristics while adjusting SSB transmit tones p 89 The
126. perated using the following data formats Data formats differ according to com mand numbers A data area or sub command is added for some commands mini plug cable Controller to IC 746PRO OK message to controller D Felre es eo cn se owaerea ro elre eo e re ro Lg Fa OQ D SG o v G DL wf 2 Eb oe eo Go ge ye 85 roe SG OD Z SEC D oo D O X D e z5 o CE gg hoe oe x ed o 25 O x O ko ae zZ S o oE Ss CE TE goo e S o o os D E D oz EZ wo fe o ZQ D c Y gD OD c5 5 O 50 0D 5 cS 50 C8 Qg E Eo Oc amp O O O O A A oO OC oO O s Ec OO Qos TO O O C Os TO O D 5c n D Z Oo So og Os W Oo Ox u O o SD M o Z FelFe eo eo cn se oaaaea ro Felre Eo e Fa ro 2 Gr G D IC 746PRO to controller NG message to controller e Command table o Sendireauency data o Bo EcrangevFOAanavFoB command 06 0001 0101 Select memory channel Select AM Set offset fr x Select CW D ____ Setoffsetfrequency OE 00 Select RTTY Scan stop Select FM Programmed memory scan start Select CW R Programmed scan start Select RTTY R AF scan start Select VEO mode Fine programmed scan start Fine AF scan start need Memory scan start Select VFO B y Equalize VFO A and VFO B Select memory scan start 95 CONTROL COMMAND 14 e Command table continued 01 Level data 02 Level data
127. r send Send read Cl V transceive set O OFF 1 ON Send read Cl V 731 mode set O OFF 1 ON Send read speech compressor level set 0 0 to 10 10 Send read SSB TX Tone Bass level 0 5 to 10 5 Send read SSB TX Tone Treble level O 5 to 10 5 Send read SSB RX Tone Bass level 0 5 to 10 5 Send read SSB RX Tone Treble level O 5 to 10 5 Send read AM TX Tone Bass level 0 5 to 10 5 Send read AM TX Tone Treble level O 5 to 10 5 Send read AM RX Tone Bass level 0 5 to 10 5 Send read AM RX Tone Treble level O 5 to 10 5 Send read FM TX Tone Bass level 0 5 to 10 5 Send read FM TX Tone Treble level O 5 to 10 5 Send read FM RX Tone Bass level 0 5 to 10 5 Send read FM RX Tone Treble level O 5 to 10 5 Send read contact number style O Normal 1 190 ANO 2 190 ANT 3 90 NO 4 90 gt NT Send read count up trigger chan nel 1 M1 2 M2 3 M3 4 M4 Send read present number 1 9999 Send read CW side tone gain O min to 255 max Send read CW side tone gain limit O OFF 1 ON Send read CW keyer repeat time 1 1 sec to 60 60 sec Send read CW keyer dot dash ratio 28 1 1 2 8 to 45 1 1 4 5 Send read rise time O 2 msec 1 4 msec 2 6 msec 3 8 msec Send read paddle polarity O Normal 1 Reverse Send read keyer type O Straight 1 Bug key 2 ELEC Key Send read mic up down keyer set O OFF 1 ON Send read RTT
128. r the settings e AGC auto gain control p 49 While is selected with MENU push AGC M AGC amp or AGC OFF e 1 4 function p 21 While fii is selected with MENU push F3 4 z4 to turn the 1 4 function ON and OFF About CW reverse mode CW reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes Use when interfering signals are near a desired signal and you want to change the interference tone 1 Push CW RTTY several times to select CW mode 2 Push CW RTTY for 1 sec to select CW or CW R mode e Check the interfering tone About CW pitch control The received CW audio pitch and monitored CW audio can be adjusted to suit your preference 300 to 900 Hz in 25 Hz steps without changing the operating fre quency About keying speed The transceiver s internal electronic keyer speed can be adjusted from 6 to 60 wpm Rotate KEY SPEED clockwise to increase keying speed counterclockwise to decrease keying speed CW side tone function When the transceiver is in the receive condition and the break in function is OFF p 56 you can listen to the tone of your CW signal without actually transmit ting This allows you to match your transmit signal ex actly to another station s This also convenient for CW practice CW side tone level can be adjusted in keyer set mode p 33 RECEIVE AND TRANSMIT ____ _ Push for 1 s
129. red when there is no interference NOTE In the center PBT position on CW it it normal for the graphic display s center line to be slightly to the left side of PBT envelope if a CW filter selection of 800 Hz or above is selected When PBT is used the audio tone may be changed e Not available for FM mode eFor AM and RTTY with RTTY filter ON modes TWIN PBT inner control only can be activated and functions as an IF shift function While rotating TWIN PBT noise may occur This comes from the DSP unit and does not indicate an equipment malfunction e By pushing PBTC momentarily indicates the passband width G3 and shifting value amp of the filter being used PBT OPERATION EXAMPLE Center Passband FUNCTIONS FOR RECEIVE 5 TWIN PBT control fe o Con EEEE 5 O oo olo YV YO cdh o O C 2 K aes O OS i ee Ce eteteteta lalallala PBTC Passband width and shifting value are indicated while TWIN PBT is operated Appears when PBT is used e Filter set mode indication Shows the selected filter and passband width e Indication while PBT setting es oe ee a Appears when passband is shifted By pushing PBTC for 1 sec the shifted value returns to the default setting and the dot disappears Passband IF shift pass band
130. rom extreme heat cold or vibrations and away from TV sets TV antenna ele ments radios and other electromagnetic sources The base of the transceiver has an adjustable stand for desktop use Set the stand to one of two angles de pending on your operating conditions E Grounding To prevent electrical shock television interference TVI broadcast interference BCI and other prob lems ground the transceiver through the GROUND terminal on the rear panel For best results connect a heavy gauge wire or strap to a long earth sunk copper rod Make the distance be tween the GND terminal and ground as short as pos sible Y AN WARNING NEVER connect the GND j 4 terminal to a gas or electric pipe since the connec Y tion could cause an explosion or electric shock OO 6 ao INSTALLATION AND CONNECTIONS E Antenna connection For radio communications the antenna is of critical im portance along with output power and sensitivity Se lect antenna s such as a well matched 50 antenna and feedline 1 5 1 or better of Voltage Standing Wave Ratio VSWR is recommended for your desired band Of course the transmission line should be a coaxial cable When using 1 antenna use the ANT 1 connector CAUTION Protect your transceiver from lightning by using a lightning arrestor PL 259 CONNECTOR INSTALLATION EXAMPLE Slide the coupling ring do
131. rse polarity for transmit and normal polarity for receive Ei Reverse polarity for both transmit and receive Push F2 i to start the tone scan function Pii Pa Ea a HE pode ponyen biote Or Ppp Greke Soe blinks when repeater tone scan tone squelch scan or DTCS code scan is operated re spectively 6 When a matched tone or code is found the scan pauses and the tone frequency or code is set for the selected tone as in step When the tone scan or DTCS code scan is operated in memory or call channel mode the detected tone fre quency or code can be used temporarily To keep the detected tone frequency or code setting for memory contents you must over write the memory or call channel Q Push F2 H to cancel the tone scan function e Rotating the tuning dial during scan also cancels scan operation F4 Push F4 for 1 sec D Aa n A Push F1 several times to select tone type e Repeater tone scan e a SS S ae T LahA Zed tb ot NNN AN NAN N Push F2 to start cancel the scan e Tone squelch tone scan SS oS SS Push F2 to start cancel the scan H 7 4 a m m H H 7 e DTCS code scan Phe bl pher REDRESS o happ Se et PEE UN VA ANNN SS Push F2 to start cancel the scan Push F1 several times to select polarity 8 74 mm O ANTENNA TUNER OPERATION 15 E Antenna connection and selection The IC 746PRO has 2 antenna c
132. ry channel e All memory channels including blank channels can be selected e Memory channels can also be selected using the micro phone UP DN keys Cait 2 oG ae a aes Gee a V M M CH CALL ececooo 20 50 see eee es 100 VFOA f cH Disappears when a channel is programmed e During memory mode 62 63 MEMORY OPERATION E Programming a memory Memory channel programming can be preformed ei ther in VFO mode or in memory mode Programming in VFO mode 1 Set the desired frequency and operating mode in VFO mode 2 Rotate M CH to select the desired memory chan nel e BLANK appears if the selected memory channel is a blank channel and does not have contents 3 Push MW for 1 sec to program the displayed fre quency and operating mode into the memory chan nel e3 beeps are emitted when memory programming is suc cessful Programming in VFO mode 1 Select the desired memory channel with M CH in memory mode e Memory channel contents appear in the display e BLANK appears and no frequency readout is displayed if the selected memory channel is a blank channel and does not have contents 2 Set the desired frequency and operating mode in memory mode e To program a blank channel use direct frequency entry with the keypad or memo pads etc 3 Push
133. ry channels P1 and P2 For AF scan Set the AF span AF scan range in the scan screen For memory scan Program 2 or more memory channels except scan edge memory channels For select memory scan Designate 2 or more memory channels as select mem ory channels To designate the channel as a select memory channel choose a memory channel then in the memory name screen e Scan resume ON OFF You can select the scan to resume or cancel when de tecting a signal in set mode Scan resume ON OFF must be set before operating a scan See p 70 for ON OFF setting and scan resume condition details AF SCAN Repeatedly scans within AF span area Start frequency AF frequency AF frequency This scan operates in both VFO and memory modes SELECT MEMORY SCAN Repeatedly scans all selected memory channels This scan operates in memory mode e Scan speed Scan speed can be selected from 2 levels high or low in set mode See p 70 for details e Squelch condition Scan pauses on each channel when the scan resume is ON not applicable when OFF The scan continues until it is stopped manually and does not pause even if it detects signals Scan stops when detecting a signal If you set scan resume ON in scan set mode the scan pauses for 10 sec when detecting a signal then resumes When a signal disappears while scan is paused scan resumes 2 sec later SCANS 8 E Voice squelch control function This f
134. s those of connected transceivers or re ceivers and vice versa When connecting the IC 746PRO to the IC 735 for transceive operation you must change the operating frequency data length to 4 bytes e This item must be set to ON only when operating the transceiver with the IC 735 4 bytes of frequency data 5 bytes of frequency data default SET MODE 11 88 89 11 SETMODE E Tone control set mode Q Entering tone control set mode Tone levels bass and treble for each transmit and re ceive audio can be set for each phone mode indepen dently e Set mode operation 1 Push MENU several times to select pg 2 Push F4 fi 4 to select the tone control set mode 4 Push SSB or AM FM to select the desired oper ating mode 5 Set the desired condition using the tuning dial e Push F3 for 1 sec to select a default value 6 Push MENU to exit the set mode Tone control set mode items 1 Tet beer en This item adjusts the bass level of the transmit audio tone from 5 dB to 5 dB in 1 dB steps 2 Fa repie This item adjusts the treble level of the transmit audio tone from 5 dB to 5 dB in 1 dB steps 3 pimi Eee This item adjusts the bass level of the receive audio tone from 5 dB to 5 dB in 1 dB steps 4 he Treb je This item adjusts the treble level of the receive audio tone from 5 dB to 5 dB in 1 dB steps
135. sceiver output power and linear ampli fier ALC output level referring to the linear amplifier instruction manual Be sure the linear amplifier key ing circuit control voltage is compatible with the IC 746PRO before connecting to SEND jack The ALC input level must be in the range O V to 4 V and the transceiver does not accept positive volt age Non matched ALC and RF power settings 4 could cause a fire or ruin the linear amplifier MOM NOW 4 The specifications for the SEND relay are 16 V DC 40 5 A If this level is exceeded a large external U relay must be used OOS Long wire or optional AH 2b 7 lle fi 00 003 BASIC OPERATION EE E When first applying power CPU resetting Before first applying power make sure all connections required for your system are complete by referring to Chapter 2 Then reset the transceiver using the fol lowing procedure 4 NOTE When first applying power or when operat f ing in cold environments the display may flicker or Y appear faint This is normal and will disappear once 4 the transceiver has warmed up 1 Make sure the transceiver power is OFF POWER F INP M CL 2 While pushing M CL and F INP push POWER for 1 sec to turn power ON e The internal CPU is reset e The transceiver displays its initial VFO frequency when resetting is complete 3 Correct the set mode settings after resetting if de sired
136. select the desired DTCS code number and push F5 to select the desired code polarity hii Normal polarity is used for both transmit and receive i Normal polarity is used for transmit reversed polarity is used for receive mhd Reversed polarity is used for transmit normal polarity is used for receive Ei Reversed polarity is used for both transmit and receive e Push F3 for 1 sec to select the default code and polar ity 7 Push MENU to return to F414 Communicate in the usual manner e Available tone codes eeoceeeannerereeee ren ee ee ee ee Push F4 for 1 sec Select a code with the tuning dial Push F5 to select the polarity E Repeater operation A repeater amplifies received signals and retransmits them at a different frequency When using a repeater the transmit frequency is shifted from the receive fre quency by an offset frequency A repeater can be ac cessed using split frequency operation with the shift frequency set to the repeater s offset frequency 1 Push a band key to select the desired band 2 Push A B to select VFO A 3 Push AM FM to select FM e Pushing AM FM toggles between AM and FM 4 Rotate the tuning dial to set the repeater transmit frequency While fii is selected push F2 f4_ amp several times to set the offset direction e DUP_ or DUP appears 0 100 MHz for HF 0 500 MHz for 50 MHz and 0 600 MHz for 144 MHz band is set by d
137. sending reading the split or duplex frequency setting o l O ab L gt x oO a O 5 O 2 J cS 5 D gt O D O O D O O D D 5 O c Vs O N D N n iy 25 N I x I I I T x D Er o o lt Oi il O O O O Or D a D D a D a D D a ADO No need to enter for duplex frequency setting Repeater tone tone squelch frequency setting The following data sequence is used when sending reading the DTCS code and polarity setting O oo xi x i Fixed digit 0 gt Fixed digit 0 gt 100Hz digit 0 2 gt 10 Hz digit 0 9 gt 1 Hz digit 0 9 gt 0 1 Hz digit 0 9 gt Not necessary when setting a frequency DTCS code and polarity setting The following data sequence is used when sending reading the DTCS code and polarity setting gt gt Normal 1 Reverse Receive polarity Normal 1 Reverse 1st digit 0 7 gt 2nd digit 0 7 gt 3rd digit 0 7 gt Transmit polarity Fixed digit 0 gt 0 0 e General e Frequency coverage Unit MHz Receive 0 030 60 000000 108 000 174 000000 Transmit 1 800 2 000000 3 500 3 999999 7 000 7 300000 10 100 10 150000 14 000 14 350000 18 068 18 168000 21 000 21 450000 24 890 24 990000 28 000 29 700000 50 000 54 000000 144 000 148 000000 Some frequency ranges are not guaranteed e Mode USB LSB CW RTTY AM FM e
138. shifted By pushing PBTC for 1 sec the shifted value returns to the default setting and the dot disappears Center Passband Passband IF shift pass band IF center frequency interference desired signal inteference desired signal IF center freq interference VIII QUICK REFERENCE GUIDE 3 RX Tone Control Once you have mastered your filter settings one last feature to enable the most intelligible audio is the ac tual audio tone you hear You can adjust the equal ization of your received audio 5dB 1 Push MENU several times or until i is shown on the display 2 Push F4 Ti 4 for the Tone Control set mode 3 Push the appropriate mode switch to adjust SSB AM or FM MENU Tuning dial component 1 Bis Rees This item adjusts the bass level of the receive audio tone from 5 dB to 5 dB in 1 GB steps 2 a Treble This item adjusts the treble level of the receive audio tone from 5 dB to 5 dB in 1 dB steps We hope these pointers have been helpful Now you are ready for the Ready to call CQ E Ready to call CQ NR Max CCW NOTCH Max CCW O ICOM IC 74 5PRO T HF VHF TRANSCEIVER TWIN PBT I TUNER ANT NR JOTCH TRANSMIT TRANSMIT OFF PHONES NS Y Q O NR GVNOTCH ELEC KEY AF RF SQL
139. sound when the VFO equalization is completed CONVENIENT Use two VFOs as a quick memory When you find a new station but you wish to continue searching the Two VFO system can be used for quick mem ory storage 1 Push A B for 1 sec to store the displayed frequency into the undisplayed VFO 2 Continue searching for stations 3 Push A B to retrieve the stored frequency 4 To continue searching for a station push A B again BASIC OPERATION V M Joo t nNesse 26 Sets re ao oe O s Le z a LO m O O 0 0 O O O OF 3 20 21 3 BASIC OPERATION E Frequency setting The transceiver has several tuning methods for conve nient frequency tuning Tuning with the tuning dial Band keys 1 Push the desired band key on the keypad 1 3 times e3 different frequencies can be selected on each band with the band key p 19 2 Rotate the tuning dial to set the desired frequency If the dial lock function is activated the lock indicator lights and the tuning dial does not function In this case push LOCK SPCH to deactivate the lock function see p 53 for details Quick tuning step The operating frequency can be changed in kHz steps 0 1 1 5
140. switch for 1 sec to toggle between CW and CW R RTTY and RTTY R or to select data mode if necessary See the diagram below right for the order of selection Microphone signals are muted when data mode is f selected e Selecting SSB mode Push SSB to select USB or LSB e USB is selected first when above 10 MHz or LSB is se lected first when below 10 MHz operation e After USB or LSB is selected push SSB to toggle be tween USB and LSB eAfter USB or LSB is selected push SSB for 1 sec to select USB data or LSB data mode respectively e Selecting CW RTTY mode Push CW RTTY to select CW or RTTY e After CW CW R or RITY RTTY R is selected push CW RTTY to toggle between CW and RTTY eAfter CW or RTTY is selected push CW RTTY for 1 sec to toggle between CW and CW reverse or RT TY and RTTY reverse mode respectively e Selecting AM FM mode Push AM FM to select AM or FM e After AM or FM is selected push AM FM to toggle be tween AM and FM mode e After AM or FM is selected push AM FM for 1 sec to select AM data or FM data mode respectively E Volume setting Rotate AF control to output a suitable audio level AF RF SQL Decreases Increases No audio output Max audio output SSB CW RTTY AM FM Push mode switch for 1 sec AF control E Push mode switch momentarily
141. t the 12 o clock po sition for more than 30 W output power 30 6 Read the SWR on the SWR meter T Push TRANSMIT or release PTT to receive The built in antenna tuner matches the transmitter to the antenna when the SWR is lower than 3 1 Plot measurement Plot measurement allows you to measure the SWR over an entire band While i is selected with MENU push F3 SiE e SWR graph screen appears 2 Rotate RF PWR clockwise past the 12 o clock po sition for more than 30 W output power 30 3 Set the center frequency for the SWR to be mea sured 4 Push F5 for 1 sec several times to select the de sired measuring step from 10 50 100 and 500 kHz 5 Push F3 several times to select the desired num ber of measuring steps from 3 5 7 9 11 and 13 steps Push F1 to start the measuring T Push TRANSMIT or push and hold PTT on the microphone to measure the SWR e Frequency marker 4 appears below SWR graph RTTY mode is automatically selected When pushing TRANSMIT again or releasing PTT the frequency marker and frequency indica tion move to the next frequency to be measured 9 Repeat steps 7 and 8 to measure SWR over the entire frequency range When the measured SWR is less than 1 5 1 the antenna is well matched with the transceiver in the measured frequency range s p1 1 3 5 7 9 po PAARRANETEETTENINI ecceee 20 5
142. tences contact numbers etc Total capacity of the memory keyer is 50 characters per memory channel e Programming contents 1 Push MENU to select 14 then push F4 piz to select the memory keyer menu 2 Push F3 1 fT to select edit menu eMemory keyer contents of the Channel 1 71 is indi cated e Push F5 to manually increment the contest number 3 Push F1 to select the desired memory keyer chan nel to be edited 4 Input the desired character by rotating the tuning dial or by pushing the keypad for number input e Selectable characters with the tuning dial NOTE ig used to transmit a following word with no space such as AR Put before a text string such as AR and the string AR is sent with no space is used to insert the CW contact number The contact number automatically increments by 1 This function is only available for one memory keyer channel at a time Memory keyer channel M2 used by default 5 Push F2 4 or F3 to move the cursor back wards or forwards respectively 6 Repeat steps and to input the desired charac ters T Push MENU 2 times to return to fi7 Pre programmed contents e Edit menu Move cursor left right Input space Select M1 to M4 Clear character M2 default indication When inputting an asterisk the counter is incremented by 1 M3 default indication M4 default indication Exa
143. th of signals and their location in relation to the center displayed Band scope in frequency Signal strength is relative to the S meter level S1 to S9 with each vertical dot in the dicator band scope indicator equal to one segment of the S meter Signal activity is measured 30 steps from the center frequency with each step equal to the selected sweep step After a sweep indicates the relative position of the selected frequency When the selected fre K quency is outside of the sweep range sg or E indicator flashes After changing the fre quency push F3 for 1 sec to automatically return to the center frequency Frequency indicator mar Indicates the selected sweep step 0 5 1 2 5 10 20 and 25 kHz are selectable Each dot of the band scope indication is approx equal to the selected sweep step The band scope measures receive signal conditions over a specified range on either side of a selected fre quency in either VFO or memory modes 1 Rotate the tuning dial to tune a frequency 2 While fH is selected push F5 z F to select the band scope menu eStarts sweeping automatically with the previously se lected sweeping step e During sweep received signals cannot be heard sweep step 4 Push F1 to start sweeping then stop automatically L after sweeping Set a e Push F1 for 1 sec to start continuous sweeping In this gt HE case it is necessary to push F1 to stop sweeping
144. the pre amp OFF preamp 1 ON or preamp 2 ON PAMP P AMP or PMP appears when the preamp 1 preamp 2 or preamp is set to ON respec tively depending on operating frequency band Push P AMP ATT for 1 sec to set the attenuator ON ePush P AMP ATT momentarily to turn the attenuator OFF e ATT appears when the attenuator is set to ON e Noise blanker p 51 Push NB to turn the noise blanker ON and OFF e NB appears when the noise blanker is set to ON e Push NB for 1 sec to enter noise blanker set mode e Noise reduction p 53 Push NR to turn the noise reduction ON and OFF e Rotate NR control to adjust the noise reduction level e NR appears when the noise reduction is set to ON Convenient functions for transmit e Break in function p 56 Push VOX BK IN several times to set the break in OFF semi break in or full break in BK IN or BK IN appears when the semi break in or full break in is set to ON respectively CW PITCH KEY SPEED CW RTTY Tuning dial CW or CW R appears e Auto notch filter p 53 Push B NOTCH to turn the auto or manual notch function ON and OFF eRotate NOTCH control to set the attenuating fre quency for manual notch operation e Twin PBT passband tuning p 52 Rotate TWIN PBT controls inner outer e Push PBTC to clea
145. ting the tuning dial changes the receive frequency The split lock function is ON by default but can be turned OFF in set mode While split frequency operation is ON push LOCK SPCH to activate the split lock function 2 While pushing XFC rotate the tuning dial to change the transmit frequency elf you accidentally release XFC while rotating the tuning dial the receive frequency does NOT change FUNCTIONS FOR TRANSMIT 6 e Setting the frequency while pushing XFC Shows shift frequency and direction Shows transmit frequency for split operation gt O RO 6 6 6246 ata te XFC Tuning dial LOCK SPCH 60 61 6 FUNCTIONS FOR TRANSMIT E Measuring SWR The IC 746PRO has a built in circuit for measuring an tenna SWR no external equipment or special adjust ments are necessary The IC 746PRO can measure SWR in 2 ways spot measurement and plot measurement are available Spot measurement Push TUNER to turn the antenna tuner OFF 2 Turn the COMP meter OFF Push MENU for 1 sec to enter set mode Push F1 or F2 several times to select the OPP Ferter item gt Rotate the tuning dial to set the COMP meter OFF Push MENU to exit set mode 3 Push CW RTTY several times to select RTTY mode 4 Push TRANSMIT or PTT on the microphone 5 Rotate RF PWR clockwise pas
146. uency turning the Notch knob clockwise moves the notch up the Notch function indicators VII band and counter clockwise will move the notch down the band Once selected an icon NOTCH will appear on the display NR NOTCH Low frequency High frequency d Filters Your C 746PRO has an incredible IF DSP based filter network with over 100 settings eDial in your filters By pushing FILTER for 1 sec you enter the filter set mode This is where you are able set the three filter presets Across the bottom of the display you will see the Fi icon The switch di rectly below along with the tuning dial will be used to select the changes you will make The selected filter width is indicated for approx 1 sec when FILTER is pushed Filter selection NOTE Your IC 746PRO is equipped with multiple AGC circuits This allows the DSP to filter out inter fering signals and QRM while also taking this in terference out of the AGC Bottom line this will ei ther eliminate or greatly reduce the pumping of the AGC from the interfering signal e Filter set mode indication Shows the selected filter and passband width e Indication while setting Reverses Appears While pushing F1 F passband width 1 rotate the tuning dial to set QUICK REFERENCE GUIDE
147. unction is useful when you don t want unmodu lated signals pausing or cancelling a scan When the voice squelch control function is activated the receiver checks received signals for voice components VSC indicator lf a receiver signal includes voice components and the tone of the voice components changes within 1 sec scan pauses or stops If the received signal includes no voice components or the tone of the voice compo vee nents does not change within 1 sec scan resumes sO rrrrzattrreeesg terres While fi is selected with MENU push F5 ir to switch the VSC Voice Squelch Control function ON and OFF Ha oe EEEE e VSC appears when the function is activated ope e The VSC function activates for any scan Fi J F2 Jf Fs J F4 J s eThe VSC function resumes the scan on unmodu lated signals regardless of whether the scan re sume condition is set to ON or OFF Push F5 to turn the VSC function ON and OFF E Scan set mode When the squelch is open scan continues until it is stopped manually it does not pause on detected sig nals When squelch is closed scan stops when de tecting a signal then resumes according to the scan resume condition Scan speed and the scan resume condition can be set using the scan set mode Push MENU to select ft Push F1 SiH to select scan menu item Rotate the tuning dial to select scan speed from Push F1 high and low e LiTrSP scan
148. w speed 25 tuning steps sec 09 h ieh GPT OPO This item selects the RIT ATX frequency clearing in struction with PBTC Clears the RIT ATX frequency when PBTC is pushed momentarily Clears the RIT ATX frequency when PBTC is pushed for 1 sec default 30 Ei Pinup CRESTS This item turns the PBT shifting value indication ON and OFF during TWIN PBT control operation When set to ON the shifting value is displayed above the multi function switches default ON This item turns the IF filter width indication ON and OFF when selecting with FILTER When set to ON the filter width is displayed above the multi function switches default ON SET MODE 11 86 87 11 SETMODE E General set mode continued This item selects the displayed frequency shift func tion from ON and OFF When this function is activated the receiving signal can be kept in receive even when the operating mode is changed between SSB and CW The displayed frequency shifts when the operating mode is changed be tween SSB and CW The displayed frequency does not shift default 4 The frequency shifting value may differ according f to the CW pitch setting Selects the carrier point of CW mode from LSB and The carrier point is set to LSB side default The carrier point is set to USB side 34 KEER This item selects the appearing menu when F4 izi is pushed in ii at first from popei Ap peene
149. when it is not grounded Transmitting before tuning may damage the trans ceiver Note that the AH 4 cannot tune when using a 12 long wire or multiple of the operating frequency Nhen connecting the AH 4 the antenna connector Y assignments are ANT2 for the internal tuner and Y ANT 1 for the AH 4 The antenna indicator in the GLCD displays EXT when the AH 4 is connected 4 and selected MN QOr AH 4 operation Tuning is required for each frequency Be sure to re tune the antenna before transmitting when you change the frequency even slightly 1 Set the desired frequency in an HF or 50 MHz band e The AH 4 may not operate on frequencies outside of ham bands 2 Push TUNER for 1 sec e TUNER blinks while tuning 3 TUNE appears constantly when tuning is com plete eWhen the connected wire cannot be tuned the TUNE indicator goes out and the AH 4 is bypassed At that point the antenna wire connection root is to the trans ceiver directly and not via AH 4 antenna tuner 4 To bypass the AH 4 manually push TUNER e Connecting the AH 4 Coaxial cable from AH 4 ANT1 Transceiver AH 4 setting example For mobile operation Optional AH 2b antenna element For outdoor operation NEVER touch the antenna element while tuning or transmitting J severiucnne HIGH VOLTAGE
150. wn Strip the cable jacket and soft solder 10 mm soft solder Coupling ring 10mm soft Strip the cable as il solder shown at left Soft sol salts der the center con 1 2 mm ductor solder solder Slide the connector TTT EA body on and solder it Screw the coupling a fab ring onto the connector body 30 mm in 10mm in 1 2 mm ein Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out of range When the SWR is higher than approx 2 0 1 the transceiver s power drops to protect the final transis tor In this case an antenna tuner is useful to match the transceiver and antenna Low SWR allows full power for transmitting even when using the antenna tuner The IC 746PRO has an SWR meter to moni tor the antenna SWR continuously E Required connections e Front panel e Rear panel 144 MHz ANTENNA pos 13 75 INSTALLATION AND CONNECTIONS 2 CW RTTY AM FM FILTER ANTENNA 1 2 pgs 13 75 Example ANT1 for 1 8 18 MHz bands ANT2 for 21 50 MHz bands Connect a VHF 60 144 MHz antenna impedance 50 Q DC POWER SUPPLY PS 125 Optional Use the heaviest gauge wire or strap available and make the connection as short as possible Grounding prevents electrica shocks TVI and other problems 14 2 INSTALLATION AND CONNECTIONS E Advanced connections e Front panel
151. x to ANT 1 ANTENNA 1 2 Example ANT1 for 1 8 18 MHz bands ANT2 for 21 50 MHz bands Connect a VHF 60 144 MHz antenna impedance 50 Q Your IC 746PRO is equipped with an internal antenna tuner ATU for operation on 160 6 m This ATU is de signed to work with an unbalanced 50 Q feedline The purpose of the internal antenna tuner is to match the impedance of your antenna system to as close to a 50 Q load as possible This ATU will not operate with a long wire or ladder line 450 Q or other balanced feedlines An external ATU such as the AH 4 would be necessary for this kind of operation QUICK REFERENCE GUIDE proper lightning protection check with your local Beco There are many publications covering dealer for more information and recommendations PL 259 CONNECTOR INSTALLATION EXAMPLE 30 mm Slide the coupling ring a down Strip the cable jacket and soft solder Coupling ring 10 mm soft solder D 10MM soft Strip the cable as ae der the center con 1 2 mm ductor solder T Slide the connector i URIA body on and solder it Screw the coupling mb ring onto the connector body 30mm in 10mm in 1 2 mm 6 in 4 A WARNING Although a mag mount antenna works great on a vehicle DO NOT use the IC Y 746PRO with this type of antenna Y CAUTION Although your IC 746PRO has protec ZY tion to drop down power with a high SWR this Y does not completely protect the transceiver

Icom IC-746 Pro User Manual

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