IntelliTuner Automatic Antenna Tuner
Contents
1. SWR Bar Meter Menu L Network Mong ur k Turnier Indicators entree EE Auto Sem n aig tuo nme ee ids Sticky eerie s dei et e e E eden SWR 2003 2004 Enterprises Inc Instruction Manual Contents 993 IntelliTuner Automatic Antenna Tuner LC Damit serial dated p Meter ayakunaka Setup Mode Menus sse Target SWR Menu Auto Tune SWR Menu Meter Range Menu Memory Menu IntelliTune Menu SWR Menu r a a Peak Hold Menu Refresh Menu sse LC Limit Mem eneeier iiia OPERATION APPENDICES FIGURES ii Instruction Manual Manual Tuning Meter Codes and Audible Grounding Hints nesrece Antenna System Hints Location iion OPERI Matching Problemns Resetting the Tuner Factory Defaults sse Delete Antenna Memory2. Automatic Antenna Tuner Model MF 993 MFJ Antenna Tuner Watts PEP SSB 150 Watts CW INSTRUCTION MANUAL CAUTION Read Instructions Before Operating Equipment MFJ ENTERPRISES INC 300 Industrial Park Road Starkville MS 39759 USA Tel 662 323 5869 Fax 662 323 6551 VERSION 1C COPYRIGHT 2004 MFJ ENTERPRISES INC MFJ 993 IntelliTuner Automatic Antenna Tuner THE BASICS iun ha shay Specifications Sd etie ut e stades ErontiPanel ee aa eet e ete ed SWR Wattmeter esee ECD Display LCD Contrast Control eene Button ecce reet etes eo ed MODE Button eere rrt redet C UP and C DN Buttons L UP and L DN Buttons AUTO Button nee tret eere eet TUNE Button eet eee VOE Conttol s n e iR POWER Button Back Panel t tet eet ets Remote Port eu eet Mare am sya Radio Interface Transmitter a a RR E a aI aaa stan a Installation Blau Susu ba SWR Wattmeter u e u ttn nno dn nna THE MENUS Main Mode eene eene enn Digital Wattmeter Menu Power Bar Meter
3. h 9 P p suonng e dsiq Jexyeeds snd d91 YMS EE unjeg 2 Bun wanno peouejeg MEER OMN siepe lt ZI Jd 0065 0 Aejay siolloedeo aM J lunoo ou nb 13 205095 205095 UMS vc 0 Jeywisues H L 2003 2004 Enterprises Inc 28 LIMITED 12 WARRANTY Enterprises Inc warrants to the original owner of this product if manufactured MFJ Enterprises Inc and purchased from an authorized dealer or directly from MFJ Enterprises Inc to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied 1 10 11 The purchaser must retain the dated proof of purchase bill of sale canceled check credit card or money order receipt etc describing the product to establish the validity of the warranty claim and submit the original or machine reproduction of such proof of purchase to MFJ Enterprises Inc at the time of warranty service Enterprises Inc shall have the discretion to deny warranty without dated proof of purchase Any evidence of alteration erasure or forgery shall be cause to void any and all warranty terms immediate
4. Total Reset tete eed Self Tesbtu tete e k u Ad De edes Power Down Circuit Test Relay Test esi a e OR RE Firmware Version Number via Setting the Speaker Volume Wattmeter Calibration SWR Bridge Calibration Frequency Counter Calibration In Case of Difficulty Technical Assistance sse List of Accessorles a Circuit Block Diagram Figure 1 Installation Block Diagram Figure 2 MFJ 993 Front Panel Figure 3 MFJ 993 Back Panel Figure 4 Alinco Interface Cable Figure 5 Icom Interface Cable Figure 6 SWR Wattmeter 2003 2004 MFJ Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Figure 7 Power Bar Meter 10 Pigure 8 SWR Bat 10 Figure 9 Mode Button Flow Chart and Button Action esee 11 Figure 10 Main Mode Menus Display n
5. Various tuner indicators are shown on the main menus to indicate tuner status Refer to Figure 10 for locations of these indicators e Antenna A small 1 appears to indicate antenna 1 is selected a small 2 appears to indicate antenna 2 is selected e Memory When Memory is ON bar appears on top left of the Antenna indicator IntelliTune When IntelliTune is ON bar appears on top right of the Antenna indicator e Auto Semi small S appears to indicate semi automatic mode nothing appears to indicate automatic mode e StickyTune When StickyTune is ON a bar appears on top of the Auto Semi indicator e SWR Beep When SWR is a musical note J appears e LC Limit When LC Limit is OFF a two dot vertical bar segment appears on the upper left corner of the SWR Beep indicator e Meter Range When Auto Range is ON a two dot vertical bar segment appears on the lower right corner of the SWR Beep indicator Another dot appears on top of this bar segment when the meter range is high and no dot when the meter range is low Setup Mode Menus The setup mode menus allow you to set up how the MFJ 993 works and behaves There are ten setup mode menus arranged in a wrap around structure To access these setup menus press and hold the MODE button for two seconds The setup menu that will display is the one that was last used When finished press the MODE button for two seconds to go back to the
6. to the unit may result Note When the tuner power is OFF the tuner is in bypass mode and RF from the transmitter goes directly to the antenna ANTENNA 1 with no matching Remote Port female DB 9 connector for connecting to the MFJ 993RC Remote Control allowing remote operation of the tuner The MFJ 993RC duplicates all the front panel buttons except POWER and MODE In addition there are two LEDs on the remote control The red Tuning LED lights to indicate tuning is in progress and the green SWR LED lights when the SWR is below the target SWR Note To use the remote control both the ANT and AUTO buttons on the automatic tuner must be pressed in otherwise Antenna 1 and Automatic mode are selected Radio Interface A 3 5 mm stereo phone jack for connecting to s tuner interface connector of compatible radios The MFJ 993 should be powered on first 313 4 Li will display and both needles will bounce and then the radio so the radio knows a remote tuner is present The Radio Interface works with radios that are compatible with the Icom AH 3 Icom AH 4 and Alinco EDX 2 tuners When connected to a compatible radio it enables the Tune button on the radio Pressing the Tune button on the radio causes the radio to temporarily switch to CW mode transmit 10 watts and start the tuning process Once the tuning process is completed the tuner signals the radio and the radio will return to the previous mode and power setting
7. 12 Figure 11 Power On Operations sininen iea Eara a E E E aat 21 Figure 12 993 Circuit Block Diagram eese ener 28 TABLES Table t Memory Resolution op Rd RE Ehe dendo cedet da dpa dot erede 14 Table 2 Meter Needle Stationary Codes sse eene ener enne 17 Table 3 Meter Needle Bounce Codes sse trennen nnne 18 Table 2 Fail re Messages cete eet eee ret aa envie RR te kite qd 23 2003 2004 Enterprises Inc HI MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual iv 2003 2004 MFJ Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual The Basics Introduction The MFJ 993 IntelliTuner lets you rapidly tune any antenna automatically balanced unbalanced or single wire The MFJ 993 is a comprehensive automatic antenna tuning center with SWR wattmeter antenna switch for two antennas and a 4 1 current balun for balanced lines h MFJ s exclusive InstantRecall IntelliTune and AdaptiveSearc tuning with more than 2000 non volatile memories algorithms give you fast automatic The tuner includes a highly efficient switching L network with wide matching capability 1 8 to 30 MHz coverage cross needle power meters backlight LCD display a port for an accessory remote control a radio interface port and heavy duty 16 amp 1000 volt relays It is rated at 300 watts PEP SSB and 150 watts CW A maximum of 256
8. 2003 2004 Enterprises Inc 15 993 IntelliTuner Automatic Antenna Tuner Instruction Manual increased only to these limits When a selected capacitance or inductance is higher than its allowed limit and the frequency is changed that selection is automatically reduced to the value of its limit These limits are used to prevent matching of extreme load impedance outside the tuner s specification which may result in excess voltage and or current across the tuner s components This setting is not stored in non volatile memory and reverts back to the default when the tuner power is turned off Refer to Figure 10 for the on screen LC Limit indicator Default is ON Operation Manual Tuning In certain cases the operator may wish to touch up the tuner s settings For example if the target SWR is set at the default of 1 5 the tuner will stop when a match of 1 5 is found In all cases manual tuning gives the user control of the tuner if desired and the L Network menu provides a picture of the matching network configuration Manual tuning is accomplished by using the C UP C DN L UP and L DN buttons Since it is not known if more or less capacitance or inductance is needed manual tuning must be by trial and error Press C UP one time and the reflected power will indicate if C UP was the right direction If it was press C UP again and observe reflected power If not press C DN twice once to re
9. bounce or rise to one point and stay to provide information In this mode the meters do not indicate power levels For example when you press C DN and L DN simultaneously to place the tuner in bypass mode the reflected needle bounces to the 20 watts mark until you release the buttons The following tables show the meter needle stationary and bounce codes 16 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Meter Needle Stationary Codes Meter needles stay at the indicated mark until buttons are released Forward 30 Watts Mark 100 Watts Mark 300 Watts Mark TUNE L DN Meter Range 30 Watts Not Used Meter Range 300 Watts 2 beeps 1 beep TUNE C DN Auto Range Off Not Used Auto Range On TUNE 2 seconds Sticky Tune Off Sticky Tune On 2 beeps 1 beep TUNE L UP Auto Tune SWR 0 5 Auto Tune SWR 1 0 Auto Tune SWR 1 5 1 beep 2 beeps 3 beeps Both Needles Mid Scale Full Scale N o Delete Confirmation Needles Intersect at SWR 1 5 Needles Intersect at SWR 2 0 TUNE C UP Target SWR 1 5 Target SWR 2 0 1 beep 2 beeps Table 2 Meter Needle Stationary Codes If not enough power is applied for tuning less than 5 watts the display will flash 1 three times and dah dah di dah di dah dit dah dah dah will be sent on CW Increasing the input power above five watts ends this message When input power is too high the tuner
10. 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Interface cables for Alinco and Icom radios are available from MFJ Enterprises Inc Interface cables for compatible Kenwood and Yaesu radios will be available in the future The MFJ 5124A interface cable provides power and control between an Alinco radio and the MFJ automatic tuner Supported Alinco radios are DX 70 DX 77 and any Alinco radio that supports the Alinco EDX 2 tuner Pin 1 Ground connects to the Sleeves of both 3 5 mm Stereo Phone Plug and Power Plug Pin 2 13 8V connects to the Center Pin of Power Plug Pin 3 Key connects to the Tip of 3 5 mm Stereo Phone Plug Pin 4 is not connected Pin 5 Start connects to the Ring of 3 5 mm Stereo Phone Plug Figure 4 Alinco Interface Cable The MFJ 5124I interface cable provides power and control between an Icom radio and the automatic tuner Supported Icom radios are IC 706 IC 707 IC 718 IC 725 IC 728 IC 736 IC 738 IC 746 IC 756 IC 765 IC 775 and any Icom radio that supports the Icom AH 3 and 4 tuners Push and hold the radio s TUNER button for two seconds to start the tuning process Push TUNER quickly to bypass the tuner Pin 1 Key connects to the Tip of3 5 mm Stereo Phone Plug Pin 2 Start connects to the Ring of 3 5 mm Stereo Phone Plug Pin 3 13 8V connects to the Center Pin of Power Plug Pin 4 Ground connects to the Sleeves of bot
11. Menus The main mode menus show various tuner settings and status There are four main mode menus arranged in a wrap around structure When powered on tuner operation starts with the main menu that was last used Within each main menu press the MODE button briefly to view the next main menu Press and hold the MODE button for two seconds to enter the setup mode see below Various tuner indicators are shown on all four main menus Antenna 1 2 Memory IntelliTune Auto Semi StickyTune SWR Beep LC Limit and Meter Range Refer to Figures 9 and 10 for details on the displayed information Note In sideband mode the frequency readout on the tuner display jumps around to different frequencies while transmitting and stops on another frequency when un keyed This is normal and is a characteristic of sideband mode because sideband signals jump up and down in frequency Digital Wattmeter Menu Shows the frequency SWR and forward and reflected power in watts 2003 2004 MFJ Enterprises Inc 9 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Power Bar Meter Menu Shows the frequency SWR and bar meters for forward and reflected power The top bar meter is the forward power and the bottom bar meter is the reflected power The numeric reading of forward power appears at the end of the bar meters power scale is printed just below the display on the front panel Each power bar meter is consisted of 60 ba
12. SWR among 0 5 1 0 and 1 5 above the target SWR to toggle the Auto Range on and off to toggle the Meter Range between 300 and 30 watts disable Auto Range Figure 9 Mode Button Flow Chart and Button Action 2003 2004 MFJ Enterprises Inc Instruction Manual 11 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Frequency 1 t 2 Indicators Antenna Memory IntelliTune t 3 Indicators Auto Semi StickyTune 4 swR Forward power in watts 200 6 Reflected power in watts t 7 Indicators SWR LC Limit Meter Range Forward power bar meter 9 Reflected power meter Forward power watts 07 SWR meter 02 Antenna symbol antenna side of L network 07 O 3 Inductance value Capacitance value when on antenna side LA 5 Capacitance value when on transmitter side Appears when Antenna 1 is selected 5 7 Appears when Antenna 2 is selected Appears when Memory is ON Appears when IntelliTune is ON Appears when in Semi Auto mode Appears when StickyTune is 62 Appears when LC Limit is OFF 63 Appears when SWR is 2 Appears when Meter Range is 300 watts 65 Appears when Auto Range is ON Figure 10 Main Mode Menus Display 12 2003 2004 MFJ Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Tuner Indicators
13. is a series of one to five beeps where one beep indicates SWR of 1 5 or less two beeps indicate SWR of 1 6 to 2 0 three beeps indicate SWR of 2 1 to 2 5 four beeps indicate SWR of 2 6 to 3 0 and five beeps indicate SWR above 3 0 This functions independent of the acknowledgement setting When ON a musical note appears on the lower right corner of the main menus refer to Figure 10 Default is OFF Shortcut Press both L UP and L DN buttons simultaneously to toggle SWR Beep on and off Beep Menu Acknowledgement beep sounds each time a parameter 15 changed to acknowledge it This function can be turned OFF for silent operation and this is independent of the SWR beep setting Default is ON Peak Hold Menu When the peak hold function is ON the highest activated segment of the forward bar meter remains visible for about one second so that you can more easily read it When OFF the meter functions normally Default is ON Refresh Menu When the refresh function is ON the display 15 updated while tuning is in progress Default is OFF Note Refresh slows tuning progress as it takes time to update the display LC Limit Menu The upper limits of inductance L and capacitance C are factory limited according to frequency and maximum power rating i e higher frequencies need less inductance and less capacitance when the L network is properly tuned Pressing C UP and or L UP allows capacitance and inductance to be
14. posts This antenna becomes ANTENNA 1 See Antenna System Hints on page 19 4 A GROUND post is provided for an RF ground connection See Grounding Hints on page 18 5 Connecta 12 to 15 VDC power source to the input jack labeled POWER SWR Wattmeter The backlit cross needle meter measures forward power reflected power and SWR and operates whenever the tuner is powered on Forward power up to 300 watts is displayed on the left hand FORWARD meter scale Reflected power up to 60 watts is read on the right hand REFLECTED meter scale For low power tuning meter ranges of 30 watts forward and 6 watts reflected are available Divide the readings on these scales by ten when in the low power meter range Figure 6 SWR Wattmeter 8 2003 2004 Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual To toggle between the high and low meter ranges press the TUNE and L DN buttons simultaneously The forward needle will read 300 for high range and 30 for low range until the buttons are released On the main LCD screen in the high range a small dot appears in the lower right corner of the screen No dot appears in the low range One beep indicates high range is selected two beeps indicate low range is selected Refer to Figure 10 for the on screen Meter Range indicator The meter can be set to auto range Auto range automatically sets the meter scales according to the input RF powe
15. s components This limit can be removed in the LC Limit setup menu but is not recommended Pressing C UP and C DN simultaneously toggles the capacitor between the input and output sides of the L network Forward needle bounces to 30 watts when the capacitor is on the transmitter side Reflected needle bounces to 5 watts when the capacitor is on the antenna side 4 2003 2004 MFJ Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual e L UP and L DN Buttons Used to manually increase or decrease the inductance of the L network matching circuit The inductance range is 0 to 24 86 microhenries The upper limit of inductance dependent on frequency is used to limit the maximum voltage and current across the tuner s components This limit can be removed in the LC Limit setup menu but is not recommended Shortcut Press both L UP and L DN buttons simultaneously to toggle SWR Beep on and off See SWR Beep Menu on page 15 Note Pressing C DN and L DN both DOWN buttons simultaneously places the tuner bypass mode The reflected needle bouncing to the 20 watt mark indicates this RF from the transmitter goes directly to the antenna with no matching e AUTO Button Used to select automatic or semi automatic tuning mode Button out selects automatic mode the tuning routine is automatically started when at least 5 watts of power is applied and the SWR is a preset amount above the p
16. 15 approximately one percent of the lower frequency of that band There are over a thousand memory locations for each antenna Tuner settings are stored in memory separately for Antenna 1 and Antenna 2 settings for balanced line or single wire antennas are stored as Antenna 1 Refer to Figure 10 for the on screen Memory indicator Default is ON To clear the memory for one antenna select the antenna with the ANT button turn off the power t tuner then press and hold both TUNE and C DN buttons while turning on the power A i message will appear Total Reset erases both antenna memories and returns all to their factory default states achieve fis turn power off press and hold TUNE L DN and C DN buttons while turning on the power A 1 message will appear IntelliTune Menu Turns the IntelliTune tuning algorithm on and off When the tuner cannot find an appropriate setting in its memory it begins its calculation function It measures the complex impedance of the antenna load at that frequency then it calculates the L C components needed for a match Then it fine tunes the component values If for any reason the tuner cannot calculate the load impedance it proceeds to yet another method of calculation If for any reason this function can be turned off Refer to Figure 10 for the on screen IntelliTune indicator Default is ON SWR Beep Menu Turns the aural SWR meter on and off The aural meter
17. L Control A trimpot control that adjusts the volume level of the aural SWR meter Use a small flat blade screwdriver and turn clockwise to increase volume level e POWER Button Used to turn the power on and off Note that during power on the analog meter bounces three times to indicate the model number 993 When the power is off the tuner is placed in bypass mode and Antenna is selected When turning on the power the tuner automatically restores all previous settings and displays the target SWR on the main screen 2003 2004 MFJ Enterprises Inc 5 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Back Panel TRANSMITTER ANTENNA 1 ANTENNA 2 MFJ ENTERPRISES INC my sm STARKVILLE MS USA gt A BALANCED LINE WIRE ms POWER REMOTE 12VDC PORT GROUND Do not connect WIRE and INTERFACE Install Jumper When Using ANTENNA 1 at same time BALANCED LINE Antenna Figure 3 MFJ 993 Back Panel Power This jack accepts a standard 2 1 x 5 5 mm coaxial plug with positive center and negative sleeve The tuner requires 12 volts DC at up to 1 amp The use of a regulated supply is not mandatory but is recommended for best performance An optional 12 volts DC 1 5 amp power supply the MFJ 1316 is available from MFJ Enterprises Inc WARNING Do not apply voltages greater than 18 volts to this unit or permanent damage
18. Secure the cover back onto the tuner 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual In Case of Difficulty If the LCD screen is blank check adjustment of the contrast control If no audio is present with audio enabled adjust the volume control If the tuner acts erratic reset the tuner to factory defaults by pressing both the TUNE and L DN buttons while turning the power on If the tuner fails to tune please double check all connections and follow the tuning procedures again Be sure you are using enough inductance through manual adjustment and minimum capacitance If the tuner arcs at the rated power levels please double check all connections and follow the tuning procedures again Ensure you are not exceeding the tuner s rated power handling capability Be sure you are using the least amount of inductance and the greatest capacitance possible that still allows matching the load on the operating frequency Note If the tuner arcs when operating on the 160 meter band it may be necessary to reduce transmitter output power If you are still unsuccessful but the tuner does adjust and operate when used with a dummy load or another antenna please read Grounding Hints on page 18 and Antenna System Hints on page 19 Technical Assistance If you have any problem with this unit first check the appropriate section of this manual If the manual does not r
19. a Tuner Instruction Manual Shortcut Press both TUNE and C UP buttons simultaneously to toggle the target SWR between 1 5 and 2 0 which is indicated by the meter SWR scale Refer to Table 2 for meter code Auto Tune SWR Menu Allows you to set the SWR threshold in the range 0 5 to 1 5 In the automatic mode the tuning process will automatically start when the SWR is above the target SWR by this amount of SWR threshold For example for target SWR of 1 5 and auto tune SWR of 1 0 the tuning process will start whenever the SWR is above 2 5 1 5 1 0 and there is at least 5 watts of RF power Default is 1 0 Shortcut Press both TUNE and L UP buttons simultaneously to cycle the auto tune SWR among 0 5 1 0 and 1 5 Refer to Table 2 for meter code Meter Range Menu Allows you to select the meter scale range In the 30 watts low range the forward full scale is 30 watts and the reflected full scale is 6 watts divide the meter reading by 10 In the 300 watts high range the forward full scale is 300 watts and the reflected full scale is 60 watts Auto range automatically sets the meter scales according to the input RF power to the tuner Forward power greater than 30 watts or reflected power greater than six watts automatically sets the meter to the high power range Forward power less than 25 watts and reflected power less than four watts automatically set the meter to the low power range Refer to Figure 10 for the on screen Mete
20. ard and 60 watts reflected The meter can be set to low power range of 30 watts forward and 6 watts reflected The SWR is measured at the point where the two needles cross See SWR Wattmeter on page 8 for more detailed information e LCD Display A 2 line by 16 character alphanumeric display It displays the tuner s various menus and status The display contrast can be adjusted by the LCD control on the front panel Below the display are the SWR and power bar meter scales Refer to Figure 10 for descriptions of the various displayed information e LCD Contrast Control A trimpot control that adjusts the contrast of the LCD display Use a small flat blade screwdriver and turn clockwise to increase contrast e ANT Button Used to select the antenna to tune Button out selects Antenna 1 button in selects Antenna 2 The Antenna indicator on the main display indicates the selected antenna A balanced feedline or a single wire antenna is by default Antenna 1 Changing the ANT button will switch the antenna only when there is no RF power e MODE Button Time sensitive and used to navigate through the various main menus and to enter or exit the setup menus e C UP and C DN Buttons Used to manually increase or decrease the capacitance of the L network matching circuit The capacitance range is 0 to 3908 pF picofarads The upper limit of capacitance dependent on frequency is used to limit the maximum voltage and current across the tuner
21. atching an antenna with a tuner e Never center feed a half wave multi band antenna with a high impedance feedline that is close to an odd multiple of a quarter wave long e Never center feed a full wave antenna with a feedline close to a multiple of a half wave long e If this tuner will not tune a multi band antenna add or subtract 1 8 wave of feedline for the band that won t tune and try again 2003 2004 Enterprises Inc 19 MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual e Never try to load a GSRV or center fed dipole on a band below the half wave design frequency If you want to operate an 80 meter antenna on 160 meters feed either or both conductors as a longwire against the station ground To avoid problems matching or feeding any dipole antenna with high impedance open wire lines keep the lines around these lengths The worst possible line lengths are shown in brackets 160 meters dipole 35 60 170 195 or 210 235 feet Avoid 130 260 ft 80 meters dipole 34 40 90 102 or 160 172 feet Avoid 66 135 190 ft 40 meters dipole 42 52 73 83 112 123 or 145 155 feet Avoid 32 64 96 128 ft Some slight trimming or adding of feedline may be necessary to accommodate the higher bands WARNING To avoid problems a dipole antenna should be a full half wave on the lowest band On 160 meters an 80 or 40 meters antenna fed the normal way will be extremely reactive with only a few ohms of feedpoi
22. atts CW FM or AM Press and hold the TUNE button on the MFJ 993 for one second to start the automatic tuning process When completed check to ensure an SWR of 2 0 or less before increasing RF power You are ready to transmit When the tuner power is OFF the tuner is in bypass mode and RF from the transmitter goes directly to the antenna ANTENNA 1 with no matching When the tuner power is ON pressing C DN and L DN simultaneously or pressing TUNE quickly places the tuner in bypass mode zero inductance and zero capacitance and indicates by the reflected needle bouncing to 20 watts Antenna 1 Antenna 2 Transmitter ME 593 50 ohm Coax RF Ground 12 VDC Figure 1 Installation Block Diagram 2003 2004 MFJ Enterprises Inc 3 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Front Panel C UP L UP AUTO POWER 1 C DN ap L DN D TUNE ij a SWR SWR 1 12 415 2 3 5 LCD VOL db Pwr 0 25 50 75 100 300 MODEL IntelliTuner lBypass IL 300 30 MFJ 993 AUTOMATIC ANTENNA TUNER 300 Watts SSB 150 Watts CW Figure 2 993 Front Panel e SWR Wattmeter The cross needle meter measures forward power reflected power and SWR It operates whenever the tuner is power Full scale readings 300 watts forw
23. ble RF grounding RF grounds work much better when spread out over a large area especially when they employ multiple connections directly to the equipment ground point Metal water pipes heating ducts and fences may 18 2003 2004 Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual work especially if they are connected together with multiple wires but the best RF grounds are radial systems or multi wire counterpoises Radials and counterpoises provide large low resistance surfaces for RF energy RF and lightning travel on the surface of conductors Braided or woven conductors have high surface resistance to lightning and RF Ground leads for RF and lightning should have wide smooth surfaces Avoid the use of woven or braided conductors in RF and lightning grounds unless the lead needs to be flexible Antenna System Hints Location For the best performance an end fed longwire wire antenna should be at least one quarter wavelength long at the operating frequency Horizontal dipole antennas should be at least a half wavelength long and located as high and clear as possible While good RF grounds help the signal in almost any transmitting installation it is extremely important to have good RF grounds with long wire or other Marconi style antennas Matching Problems Most matching problems occur when the antenna system presents an extremely high impedance to the tuner When the antenna impeda
24. de dum ind adjust the FWD trimpot R75 located behind the display to set the forward needle to the 100 watt mark Press the TUNE button to reflected needle 6 A message will display Adjust the REF trimpot R76 located behind the display to set the needle to the 20 watt mark 7 Press the TUNE button to end calibration 8 Turn off the tuner power and secure the cover back onto the tuner et SWR Bridge Calibration To calibrate the SWR Bridge you will need a transmitter capable of 100 watts output a precise calibrated wattmeter a 50 ohm dummy load three 50 ohm SO 239 coax cables a Phillips screwdriver and a tuning tool or small flat blade screwdriver WARNING Do not touch anything inside the tuner during operation Serious painful RF burns can result WARNING Never operate the MFJ 993 with its cover removed dangerous voltages and currents can be present during operation Never exceed tuner specifications 1 Turn off the power to the tuner and the transmitter Remove the cover from the tuner 12 screws with a Phillips screwdriver 3 Connect the 50 ohm dummy load to the ANTENNA 1 connector connect the wattmeter between the transmitter and the TRANSMITTER connector on the tuner 4 Turn on the power to the transmitter Using a frequency in the middle of the HF band such as 7 253 MHz for calibration is recommended 5 Press and hold both the TUNE and L UP buttons while turn
25. e code di dah dah dit di dah di di dit di di dit and both meter needles will go to full scale If there is a problem a failure message will be displayed and sent also the forward needle will bounce and the reflected needle mark indicates the failure 10 Once you have confirmed that the audio 1s okay turn the unit off Failure Reflected Message Needle watts Indicates 1 button is shorted or improperly connected 2 MODE button is shorted or improperly connected 3 C UP button is shorted or improperly connected 4 5 C DN button is shorted or improperly connected L UP button is shorted or improperly connected 7 5 L DN button is shorted or improperly connected 10 AUTO button is shorted or improperly connected 15 TUNE button is shorted or improperly connected Radio interface cable is connected but radio power is off Non volatile memory circuitry is improperly connected 30 Microprocessor wakeup circuitry problem 40 Power down circuitry problem Table 4 Failure Messages Power Down Circuit Test When the 12 VDC power to the tuner is turned off the tuner saves all settings to non volatile memory The Power Down Circuit Test checks the power down detection circuitry It is recommended that this test be done immediately after the regular self test described above Note The tuner must be reset to factory defaults before performing this
26. eference your problem or your problem is not solved by reading the manual you may call Technical Service at 662 323 0549 or the MFJ Factory at 662 323 5869 You will be best helped if you have your unit manual and all information on your station handy so you can answer any questions the technicians may ask You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by facsimile FAX to 662 323 6551 or by email to techinfo mfjenterprises com Send complete description of your problem an explanation of exactly how you are using your unit and a complete description of your station List of Accessories MFJ 993RC Remote control 1316 12 VDC 1 5 amp power supply 5124 Interface cable for compatible Alinco radios MFJ 5124I Interface cable for compatible Icom radios 5409 6 feet long RS 232 cable female DB 9 to male DB9 connector 5803 3 feet long RG 58 50 ohm coax cable with a PL 259 connector on each end 5806 6 feet long RG 58 50 ohm coax cable with a PL 259 connector on each end 5818 18 feet long RG 58 50 ohm coax cable with PL 259 connector on each end 2003 2004 Enterprises Inc 27 Instruction Manual MFJ 993 IntelliTuner Automatic Antenna Tuner 120 66 f4IA ZI 211814 eoepelu 1
27. enters a self protection mode The tuner will not allow any of its relays to change This feature is to prevent damage to your tuner If too much power is applied when tuning the tuner will cease the tuning routine flash three times and send QRP dah dah di dah di dah dit di dah dah dit on CW This occurs when the forward power exceeds 75 watts and the SWR is greater than 3 0 or when the forward power exceeds 125 watts regardless of the SWR If more than 300 watts is applied to the tuner the tuner will go into bypass mode flash three times and send dah dah di dah di dah dit dah on CW If the tuning process is activated under these conditions the tuner will not start the tuning It will indicate the appropriate bounce code on the meter and display a warning message on the LCD 2003 2004 MFJ Enterprises Inc 17 MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Meter Needle Bounce Codes Meter needles bounce to the indicated mark until buttons are released 30 Watts Mark 100 Watts Mark 300 Watts Mark Capacitor Insufficient Power to Power Too High to Tune Switches To Forward gt 125 Watts or Transmitter Side Forward gt 75 Watts and S R gt 3 2 beeps Bypass Mode L or C at Its Limit During Switches To L 0 and C 0 Manual Adjustment Antenna Side 1 beep at lower limit 1 beep 1 beep 2 beeps at upper limit Both Needles 30 5 Marks 100 20 Mar
28. forming the self test will reset the unit to its factory default settings 22 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Here is the self test procedure 1 Turn off the power to the tuner and press all buttons to the out position Unplug the radio interface cable if one is connected from the tuner 3 If testing the MFJ 993RC Remote Control connect it to the Remote Port and make sure both ANT and AUTO buttons on the tuner are pressed to the in position 4 Set volume to a comfortable listening level 5 Press and hold only the L UP button while turning the power on 6 The test begins by di 1 1 version number such i E gt i This is the test of the display At the same time the forward needle of the meter also goes up slowly to full scale and then drops to zero followed by the reflected needle going up slowly to full scale and then drops to zero This tests the meter Release the L UP button before the message completes To skip this copyright message press C DN button 7 You will be prompted to press each of the front panel buttons The forward needle should bounce once for each press and the reflected needle should move up a division for each press 8 The unit then tests its non volatile memory Notice this step will reset the unit to its factory default settings 9 If the unit is okay a repetitive message FE will be displayed and sent as Mors
29. h 3 5 mm Stereo Phone Plug and Power Plug Figure 5 Icom Interface Cable e Transmitter 50 239 connector for coax cable from transmitter or transceiver e Balanced Line Two binding posts for connecting balanced line antennas To use balanced line antenna install a jumper as shown to the WIRE binding post e Wire Binding post for connecting single wire antennas Notice the WIRE binding post is internally connected to the ANTENNA 1 connector Note To use the WIRE binding post make sure to remove the antenna if any from the ANTENNA 1 connector e Ground Wing nut terminal for RF ground wire connection e Antenna 1 SO 239 connector for coax cable from antenna Notice the ANTENNA 1 connector is internally connected to the WIRE binding post Note To use the ANTENNA 1 connector make sure to remove the jumper and wire antenna if any from the WIRE binding post e Antenna 2 SO 239 connector for coax cable from antenna 2003 2004 Enterprises Inc 7 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Installation WARNING Never operate the tuner with its cover removed Contact with the components inside the tuner while transmitting will result in painful RF burns Locate the tuner so that the rear terminals are not accessible during operation The single wire and balanced line connection may have high voltage while transmitting Disconnect all antennas from the tuner during lightning storms A
30. ign are subject to change without notice 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Fast Start WARNING Never operate the tuner with its cover removed Contact with the components inside the tuner while transmitting will result in painful RF burns Locate the tuner so that the rear terminals are not accessible during operation The single wire and balanced line connection may have high voltage while transmitting Disconnect all antennas from the tuner during lightning storms Always tune with low power about 10 watts Apply maximum power only after tuning up Never exceed tuner specifications Do not transmit with a high SWR for extended periods of time Connect the MFJ 993 to a 12 15 VDC voltage source capable of supplying at least 1 amp Connect your transmitter to the TRANSMITTER connector using a 50 ohm coaxial cable Connect your coax fed antenna to the ANTENNA 1 connector using a 50 ohm coaxial cable or connect your random wire to the WIRE binding post or connect your balanced line antenna to the BALANCED LINE binding posts and connect a jumper between the other two posts as indicated Connect your ground connection to the GROUND post Press the POWER button to turn on the MFJ 993 tuner Place the ANT button in the out position to select antenna 1 Press the AUTO button in to select semi automatic mode Key your transmitter to output a carrier of 10 w
31. in design or manufacture without incurring any obligation to install such changes upon any of the products previously manufactured All MFJ products to be serviced in warranty or out of warranty should be addressed to Enterprises Inc 300 Industrial Park Road Starkville Mississippi 39759 USA and must be accompanied by a letter describing the problem in detail along with a copy of your dated proof of purchase This warranty gives you specific rights and you may also have other rights which vary from state to state MFJ ENTERPRISES INC MFJ 993 Manual 300 Industrial Park Road Version 1C Starkville MS 39759 Printed In U S A 03 2004 ME
32. ing the tuner power on 2003 2004 Enterprises Inc 25 6 10 11 12 13 14 15 16 993 IntelliTuner Automatic Antenna Tuner Instruction Manual A message CHL CHF will display and both meter needles will bounce Key the transmitter to 100 watts and adjust trimmer capacitor C91 for minimum reflected power Notice the reflected meter movement is exaggerated for easier calibration Key the transmitter t 100 watts output and adjust the FWD trimpot R72 until the display shows forward power of watts The forward meter also should indicate 100 watts Press the TUNE button A message displays and the reflected meter goes to full scale Turn off the transmitter and reverse the ANTENNA 1 and TRANSMITTER connections that is connect the 50 ohm dummy load to the TRANSMITTER connector and connect the transmitter wattmeter to the ANTENNA 1 connector Turn on the transmitter s power Key the transmitte 100 watts output and adjust the REF trimpot R71 until the display shows reflected power of 1 watts The forward meter yes the forward meter also should indicate 100 watts the reflected meter is at full scale Press the TUNE button to end calibration Turn off the power to the tuner and the transmitter Remove the transmitter wattmeter and the 50 ohm dummy load from the tuner Secure the cover back onto the tuner Connect your transmitter to the TRANSMITTER connector and connect yo
33. ks 300 60 Marks Not Used Not Used Power Overload Forward gt 300 Watts Table 3 Meter Needle Bounce Codes Grounding Hints To minimize RFI single wire feedlines such as used with Windom or longwire antennas should be kept away from other wiring Radiation will be minimized if the single wire feeder runs parallel and reasonably close to the wire that connects the tuner to the outdoor ground The antenna feed wire should be adequately insulated to prevent arcing or accidental contact CAUTION For operator safety a good outside earth ground or water pipe ground should always be installed and connected to the case of the MFJ 993 Make certain the safety ground also connects to the transmitter and other station accessories A wing nut post marked GROUND is provided for ground connections For safety please use good DC and RF grounds It is particularly important to have a good RF ground when using a single wire feeder When using a single wire feeder the tuner needs something to push against in order to force current into the single wire feedline If a good RF ground is not available RF will usually find its way back into the power line RFI transmitter audio circuits RF feedback or the operator RF burns Metal water pipes and ground rods provide good DC and AC safety grounds but they are often inadequate for RF grounding because they are single conductors Ground rods by themselves are almost useless for dependa
34. lways tune with low power about 10 watts Apply maximum power only after tuning up Never exceed tuner specifications Do not transmit with a high SWR for extended periods of time 1 Place the tuner in a convenient location at the operating position With a random wire or balanced line the feed through insulators may have high RF voltages These voltages can cause serious RF burns if the terminals are touched when transmitting Be sure to locate the tuner so these terminals cannot accidentally be contacted during operation 2 Install the tuner between the transmitter and the antenna Use a 50 ohm coaxial cable such as RG 58 to connect the transmitter or amplifier to the connector marked TRANSMITTER on the rear of the tuner See Figure 1 on page 3 3 Connect the antenna s to the tuner as follows e Coaxial feedlines to the SO 239 connectors labeled ANTENNA 1 and or ANTENNA 2 e Random wire or single wire line antennas should be connected to the WIRE binding post on the back of the tuner and remove the jumper wire Note the back panel warning Do not connect WIRE and ANTENNA 1 at same time When a single wire antenna is connected it becomes ANTENNA 1 Note Route all single and random wire antennas safely to prevent RF burn hazard e For a balanced feedline open wire twinlead or twin axial lines place a jumper wire as indicated on the back panel and connect the balanced feedline to the BALANCED LINE binding
35. ly Enterprises Inc agrees to repair or replace at MFJ s option without charge to the original owner any defective product under warrantee provided the product is returned postage prepaid to Enterprises Inc with a personal check cashiers check or money order for 7 00 covering postage and handling This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling the Service Department at 662 323 0549 or the MFJ Factory at 662 323 5869 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned Wired and tested PC boards installed in the owner s cabinet or connected to switches jacks or cables etc sent to MFJ Enterprises Inc will be returned at the owner s expense unrepaired Under no circumstances is MFJ Enterprises Inc liable for consequential damages to person or property by the use of any MFJ products Out of Warranty Service MFJ Enterprises Inc will repair any out of warranty product provided the unit is shipped prepaid All repaired units will be shipped COD to the owner Repair charges will be added to the COD fee unless other arrangements are made This warranty is given in lieu of any other warranty expressed or implied MFJ Enterprises Inc reserves the right to make changes or improvements
36. main mode for normal operation The tuner goes into protective bypass mode in the setup mode and restores the matching network after exiting the setup mode If no button is pressed for more than eight seconds the tuner automatically exits the setup mode restores the matching network and returns to the main mode To access the LC Limit setup menu from any setup menu press and hold the MODE button and within two seconds press both C UP and L UP buttons This difficulty is built in so the LC Limit is not accidentally disabled Notice the LC Limit is not saved into non volatile memory and will revert back to default ON when power is turned off Within each setup menu e Press the MODE button briefly to cycle through the setup menus press and hold the MODE button for two seconds to exit the setup mode and go back to the main mode e Press the C UP or L UP button to increase or turn on the setting for the current setup menu e Press the C DN or L DN button to decrease or turn off the setting for the current setup menu Target SWR Menu Allows you to set the target SWR from 1 0 to 2 0 The tuning process will stop when a match with an SWR less than or equal to the target SWR is found Setting the target SWR lower than 1 5 may require longer tuning times The target SWR is shown on the initial display when the tuner is powered on Default is 1 5 2003 2004 Enterprises Inc 13 993 IntelliTuner Automatic Antenn
37. med after this test Firmware Version Number via Meter Make sure the meter is calibrated The firmware version number is shown in the copyright message of the self test To obtain a decimal firmware version number via the meter press and hold the C UP button while turning the power on The version number X XY is represented by the meter forward needle for X X and the reflected needle for Y For example forward needle on 10 watts mark and reflected needle on 2 watts mark represent firmware version number 1 02 Release button to resume normal operation Setting the Speaker Volume To set the speaker volume ress and hold both the L UP and L DN buttons while turning the power on The message will display and send as Morse code repetitively Insert a small flat blade screwdriver into the VOL hole on the front panel to adjust the volume level Turn clockwise to increase volume level Turn the power off 24 2003 2004 Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Wattmeter Calibration To calibrate the meter needles you will need a Phillips screwdriver and a tuning tool or small flat blade screwdriver Turn off the power to the tuner and the transmitter Remove the cover from the tuner 12 screws with a Phillips screwdriver Press and hold both he TUNE mo C UP b s while turning the power on A message will display and both meter needles will bounce Use a small flat bla
38. nce is much lower than the feedline impedance an odd quarter wavelength feedline converts the low antenna impedance to a very high impedance at the tuner A similar problem occurs if the antenna has an extremely high impedance and the transmission line is a multiple of a half wavelength The half wavelength line repeats the very high antenna impedance at the tuner Incorrect feedline and antenna lengths can make an otherwise perfect antenna system very difficult or impossible to tune One example where this problem occurs is on 80 meters when an odd quarter wave 60 to 70 feet open wire line is used to feed a half wave 100 to 140 feet dipole The odd quarter wave line transforms the dipole s low impedance to over three thousand ohms at the tuner This is because the mismatched feedline is an odd multiple of 1 4 wavelength long The line inverts or teeter totters the antenna impedance A problem also occurs on 40 meters with this same antenna example The feedline is now a multiple of a half wave 60 to 70 feet and connects to a full wave high impedance antenna 100 to 140 feet The half wave line repeats the high antenna impedance at the tuner The antenna system looks like several thousand ohms at the tuner on 40 meters This places enormous strain on the balun and the insulation in the tuner since voltages can reach several thousand volts This can cause component arcing and heating The following suggestions will reduce the difficulty in m
39. ner is powered off the microprocessor saves all memories and configurations to non volatile memory ready to be used the next time the unit is turned on again If the tuner is not working properly even on initial power on try resetting to the factory defaults Factory Defaults The unit is shipped with the following default settings 2003 2004 MFJ Enterprises Inc Main Menu Setup Menu Inductance Capacitance Target SWR Auto Tune SWR Meter Range Memory IntelliTune SWR Beep Beep Digital Wattmeter Target SWR 0 uH 0 pF on transmitter side 1 5 1 0 above target SWR 300 watts high range on on off on 2 993 IntelliTuner Automatic Antenna Tuner Instruction Manual e Peak Hold on e Refresh off Note Resetting to factory defaults does not erase the antenna memories To reset the tuner to these defaults 1 Turn off the power to the tuner 2 Press and hold both the TUNE and DN b ttons while turning the power on 3 Release the buttons when appears on the display and both meter needles read full scale 4 Resume with normal operation Delete Antenna Memory To delete an antenna memory select Antenna 1 or Antenna 2 with the button that you want to delete Turn off power to the tuner and then press and hold both the TUNE and C DN buttons while turning the power back on A confirmation message ii will display Press the YES C UP button to delete the antenna mem
40. nt resistance Trying to load an 80 meters half wave dipole or shorter antenna on 160 meters can be a disaster for both your signal and the tuner The best way to operate 160 meters with an 80 or 40 meters antenna is to load either or both feedline wires in parallel as a longwire The antenna will act like a antenna worked against station ground 20 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Resetting the Tuner Press and hold Press and hold Press and hold Press and hold Instruction Manual Appendices POWER ON OPERATIONS POWER Press and hold Press and hold Press and hold Press and hold Press and hold Press and hold Press and hold Press and hold buttons while turning on the power to get the firmware version number to start the self test to test the relays to test the power down circuitry to calibrate the wattmeter to calibrate the SWR bridge to delete the selected antenna memory to reset factory defaults to perform total reset to calibrate the frequency counter to output audio for volume adjustment Each time the tu
41. ory i will display and both meter needles go to full scale or press the NO L UP button to cancel will display and both meter needles go to zero scale Release the button to resume normal operation Remember that the selected antenna memory will be lost Total Reset To erase both antenna memories and reset to factory defaults press and hold d wn and L DN buttons while turning the power on A confirmation message Press the YES C UP button to delete both antenna memories and reset factory defaults display and both meter needles go to full scale or press the NO L UP button to cancel display and both meter needles go to zero scale Release the button to resume normal operation Remember that both antenna memories will be lost Self Test A self test routine will check the functions of the MFJ 993 This routine checks the display the meter the front panel buttons the internal memory and the audio circuitry During the self test you may stop the test by turning off the unit however this should NOT be done during the memory test or the memory could be corrupted The self test can be completed in approximately 30 seconds This test can also be used to test the optional MFJ 993RC Remote Control Make sure to press both ANT and AUTO buttons on the MFJ 993 tuner to the in position before starting the self test and press the buttons on the MFJ 993RC instead of the front panel buttons when prompted Note Per
42. r For 2 sec Bar Meter SWR Bar Meter lt MODE L Network For 2 sec BUTTON ACTION while in the main modes POWER into turn power on out to turn power off in to select antenna 2 out to select antenna 1 to switch main modes and setup modes to increase capacitance to decrease capacitance to increase inductance C DN L DN L UP Press C UP or L UP to turn on or increase setting Press C DN L DN to turn off or decrease setting to decrease inductance in to select semi automatic mode out to select automatic mode less than 0 5 second to bypass the tuner press and hold for 0 5 to 2 seconds to start the tuning process press and hold for more than two seconds to toggle the StickyTune on and off to switch the capacitor between the input and output side to toggle the SWR Beep on and off to increase both capacitance and inductance to bypass the antenna tuner to toggle the Target SWR between 1 5 and 2 0 to cycle the Auto Tune
43. r Range indicators Default is 300 watts range Shortcut Press both TUNE and C DN buttons simultaneously to toggle Auto Range on and off Press both TUNE and L DN buttons simultaneously to toggle between 300 and 30 watts meter range and disable Auto Range Refer to Table 2 for meter code Memory Menu Turns the antenna memory on and off The memory resolution is the width of frequency spectrum that the tuner recognizes as being the same as a tuned frequency already in memory The memory resolution is approximately 0 1 percent of the lower frequency of each amateur band For example the memory resolution on the 40 meter band 7000 to 7300 kHz is 7 kHz if the tuner has memorized a setting for 7050 kHz it will automatically call up this setting for any frequency from 7047 to 7053 kHz The memory resolutons for the HF amateur bands 160 through 10 meters are Meter Frequency Range kHz Memory Resolution kHz 160 1800 2000 2 75 80 3500 4000 4 60 5330 5 5346 5 5366 5 5371 5 and 5403 5 two memory locations 40 7000 7300 7 30 10100 10150 10 20 14000 14350 14 17 18068 18168 18 15 21000 21450 21 12 24890 24990 25 10 28000 29700 28 Table 1 Memory Resolution 14 2003 2004 MFJ Enterprises Inc 993 IntelliTuner Automatic Antenna Tuner Instruction Manual The memory resolution for non amateur frequency bands between 160 and 10 meters
44. r segments Below 100 watts each bar segment represents two watts above 100 watts each bar segment represents 20 watts The forward bar meter has a peak hold feature The peak meter hold function freezes the highest displayed bar segment of the forward power for about one second so that you can more easily read the meter This function can be turned ON and OFF in the Peak Hold setup mode Pwr 0 25 50 75 100 300 Figure 7 Power Bar Meter SWR Bar Meter Menu Shows the frequency SWR and SWR bar meter A SWR scale is printed just below the display on the front panel The 15 segment SWR bar meter indicates SWR of 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 9 2 0 2 4 2 5 2 9 3 0 3 9 4 0 4 9 5 0 9 9 10 0 14 9 15 0 19 9 and 20 0 to infinity SWR 1 12 15 2 3 5 Figure 8 SWR Bar Meter L Network Menu Shows the SWR and the configuration of the L network matching circuit The antenna symbol on the upper left corner indicates the antenna side of the L network The capacitance value is displayed to the left when it is on the antenna side and to the right when on the transmitter side Inductance value is shown in microhenries uH and capacitance value in picofarads pF See Manual Tuning on page 16 10 2003 2004 MFJ Enterprises Inc MFJ 993 IntelliTuner Automatic Antenna Tuner MODE BUTTON FLOW CHART MAIN MODES SETUP MODES Digital gt Wattmeter Powe
45. r to the tuner Forward power greater than 30 watts or reflected power greater than six watts automatically sets the meter to the high power range Forward power less than 25 watts and reflected power less than four watts automatically set the meter to the low power range To toggle auto range on and off press the TUNE and C DN buttons simultaneously The reflected needle will read 60 for auto range ON and 5 for auto range OFF When auto range is on a two dot vertical segment appears in the lower right corner of the screen One beep indicates auto range on and two beeps indicate off Refer to Figure 10 for the on screen Auto Range indicator The SWR is read from the eight red SWR curves that range from Gower 1 0 to infinity The SWR is measured by observing the point 14 where the forward and reflected power needles cross on the red SWR forward power curved scales across the center of the meter No cumbersome or reflected power time consuming SWR sensitivity adjustments are required with 1 forward power this meter Figure 6 shows an SWR of approximately 2 0 The meter also indicates various operational states of the tuner Refer to Meter Codes and Audible Beeps on page 16 for more details The MFJ 993 also includes an SWR bar meter and an aural SWR indicator selectable by pressing L UP and L DN buttons simultaneously It also has bar meters for forward and reflected power The Menus Main Mode
46. reset target SWR Button in selects the semi automatic mode the tuning routine starts only when the TUNE button is pressed The Auto Semi indicator on the main display indicates the selected mode Note During the tuning process the tuner will make some noise These are the relays switching at a very fast pace and it is normal operation Do not be alarmed e TUNE Button Has three different functions based on the length of time you press and hold it before releasing Press TUNE quickly less than 0 5 second to bypass the tuner RF from the transmitter goes directly to the antenna with no matching Press and hold TUNE for 0 5 to 2 seconds to start the automatic tuning process The transmitter must be keyed first with at least 5 watts of power When the SWR is already below the target SWR pressing TUNE will fine tune the match for a lower SWR if possible StickyTune allows for one handed tuning operation Normal tuning requires keying the transmitter with one hand and using the other hand to push the TUNE button to start the tuning process To toggle the StickyTune mode on and off press and hold the TUNE button for two seconds When enabled a bar appears on top of the Auto Semi indicator and the tuning process starts automatically when the transmitter is keyed with at least 5 watts of power regardless of the SWR This works in both automatic and semi automatic modes One beep indicates on and two beeps indicate off e VO
47. t still cannot find a match the search is performed again using a different search pattern The target SWR can be set at 1 0 through 2 0 The minimum power to tune is approximately five watts You can manually tune where you can t transmit for listening out of ham bands The optional MFJ 993RC Remote Control provides most tuner controls allowing convenient remote locating of the tuner itself All MFJ s IntelliTuners support radio tuner interfaces that are compatible with Icom AH 3 and AH 4 tuners and Alinco EDX 2 tuner Optional interface cables MFJ 5124A for Alinco and MFJ 5124I for Icom are available from MFJ Enterprises Inc Interface cables for compatible Kenwood and Yaesu radios will be available in the future The tuners enter a sleep mode when idle and when no transmit signal is present turning off the microprocessor clock to avoid the generation of spurious signals 2003 2004 MFJ Enterprises Inc 1 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Features Automatically matches antennas from 6 to 1600 ohms impedance Handles 300 watts PEP SSB 150 watts CW Tune in less than 15 seconds usually less than 5 seconds Over 2000 non volatile memories for tuner settings Highly efficient switching L network matching circuit 1 8 to 30 MHz continuous frequency coverage Adjustable target SWR 1 0 to 2 0 Adjustable SWR threshold 0 5 to 1 5 Lighted cross needle SWR wattmeter with high low and a
48. test 2003 2004 Enterprises Inc 23 993 IntelliTuner Automatic Antenna Tuner Instruction Manual Here is the test procedure Make sure power to the tuner is off If the tuner has been reset to factory defaults skip to step 6 otherwise continue with step 3 Press and hold both the i and E DN buttons while turning the power on Release both buttons when gt i appears on the display Turn the power off Press and hold only the L DN button while turning the power on If the power down detection circuitry is okay a repetitive message FI will be sent as Morse code di dah dah dit di dah di di dit di di dit If there is a problem message will be displayed and sent as Morse code repetitively 8 Turn the power off SOS UA avrS Relay Test To test the relays and their control circuitry press and hold the C DN button while turning the power on The message i will appear Four numbers representing the relays will be shown in the center of the display The C UP L UP C DN and L DN buttons corresponding to the position of the relay numbers on the display are used to toggle each relay on and off Press button to engage the relay and release it to disengage the relay Listen for relay clicks Press the TUNE button to proceed to the next group of four relays There are 19 relays in the tuner Repeat the above procedure to test all the relays Normal operation 1s resu
49. turn to the original setting of C and once for one click past it Manual tuning of inductance is similarly accomplished using L UP and L DN Since the capacitance and inductance are interdependent some back and forth between the two may be needed just as in a conventional tuner with knobs Once you are familiar with this process you will learn how to match certain antennas and frequencies Pressing C UP and C DN buttons simultaneously moves the capacitance back and forth from one side of the inductance to the other The L Network menu displays the capacitance on the left to indicate that the capacitance is on the antenna side corresponding with the rear panel configuration of connectors the capacitance value moves to the right side of the display when the capacitance is on the transmitter side of the inductance A general rule of thumb is that loads with impedance higher than 50 ohms call for the capacitance on the antenna side loads with impedance lower than 50 ohms call for the capacitance on the transmitter side Pressing C DN and L DN simultaneously or pressing TUNE quickly places the tuner in bypass mode i e zero inductance and zero capacitance RF from the transmitter goes directly to the antenna with no matching The reflected needle bouncing to 20 watt mark indicates changing to bypass mode Meter Codes and Audible Beeps In addition to displaying power and SWR the meter also indicates tuner status The meter needles
50. ur antenna to the appropriate antenna connector on the tuner Frequency Counter Calibration To calibrate the frequency counter you will need a transmitter a 50 ohm dummy load two 50 ohm SO 239 coax cables a Phillips screwdriver and a tuning tool or small flat blade screwdriver WARNING Do not touch anything inside the tuner during operation Serious painful RF burns can result WARNING Never operate the MFJ 993 with its cover removed dangerous voltages and 26 currents can be present during operation Never exceed tuner specifications Turn off the power to the tuner and the transmitter Remove the cover from the tuner 12 screws with a Phillips screwdriver Connect the 50 ohm dummy load to the ANTENNA 1 connector connect the transmitter to the TRANSMITTER connector on the tuner Turn on the power to the transmitter Set and lock the frequency to exactly 29 000 MHz Press and hold both the C UP and L UP buttons while turning the tuner power on Both meter needles will go to full scale and a message i will display Key the transmitter to output about 10 watts Adjust trimmer capacitor C118 located between the two big integrated circuits until the tuner displays a frequency of i and the meter needles settle at the 0 watt marks Notice the meter movement 15 exaggerated for easier calibration Nominal tolerance of the frequency counter is 1 kHz Turn off the power to the tuner and the transmitter
51. uto range options Multifunction backlit LCD display with contrast control Built in frequency counter Numeric readings for SWR forward and reflected power Bar meters for SWR forward and reflected power Aural SWR meter with volume control Two SO 239 coax fed antenna connectors Connector for random wire or single wire antennas Built in 4 1 current balun for balanced line antennas Optional remote control Optional radio interface for compatible radios Specifications oeoeeee eeee 0o O Impedance matching range 6 to 1600 ohms Minimum power for tuning 5 watts Maximum power while tuning 100 watts with foldback 20 watts without foldback RF power limit 300 watts PEP SSB 150 watts CW Frequency range 1 8 to 30 MHz continuous coverage Frequency counter accuracy 1 kHz across HF bands Frequency counter range up to 50 MHz Capacitance range 0 to 3908 pF nominal 256 values Inductance range 0 to 24 86 uH nominal 256 values Relay rating 16 amp 1000 volts Relay electrical life 100 000 operations Relay mechanical life 10 million operations Memory endurance 1 million write cycles Memory data retention 100 years Power requirements 12 15 volts DC 2 1 x 5 5 mm coaxial plug center pin positive Current consumption amp or less Dimensions approx 10 1 x 2 8 x 9 2 in 257 x 71 x 234 mm width height depth not including connectors Weight approx 3 9 lb 1 77 kg Specifications and des
52. values of capacitance and 256 values of inductance are available With the inductance switched between the input and output side this provides a total of 131 072 L C tuning combinations The nominal tuning ranges are 0 to 3900 pF and 0 to 24 uH All IntelliTuners learn and remember When you transmit they automatically adjust for minimum SWR and remember the frequency and tuner settings safely stored in non volatile memory The next time you operate on that frequency or close to it and antenna these tuner settings are instantly restored and you re ready to operate in milliseconds Each of two antenna selections can learn and remember more than a thousand frequencies and tuner settings When you key your transmitter MFJ s InstantRecall checks its memory to see if you have operated that frequency before If so tuning is instantaneous and you re ready to operate If MFJ s IntelliTune algorithm based on MFJ s famous SWR Analyzer technology kicks in It measures the complex impedance of your antenna Next it calculates the components it needs and instantly snaps them in Finally it fine tunes to minimize SWR and you re ready to operate all in a fraction of a second If the antenna impedance is not within the tuner s measurement range MFJ s AdaptiveSearch algorithm goes into action Frequency is measured and relevant components values are determined Only those values are searched for fast tuning If i
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