Microair Avionics Pty Ltd
Contents
1. h P p fies 2 LY PRIORITY SQUELCH PRIORITY SQUELCH ON OFF VOL PIN 7 OF ON OFF VOL SUPPRESSION PTT PIN 4 SUPPRESSION MICROAIR FREQ 4 7 ADJUST ax MODE ADJUST 5 d 4 1 2 PTT FTT STOP Switching from comml to comm2 will move all radio functions including intercom from one radio to the other Ensure that both radios have the internal VOX intercom set up correctly M760Q Install amp User Manual 01R16 Page 14 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 11 AUXILIARY AUDIO The M760 Q can accept a line level audio input via pin 6 of the DB15 connector The volume of this audio can be set by the auxiliary equipment but will be muted down to a low level when the VOX intercom is triggered or a signal 15 received The auxiliary audio will remain muted for approx 1 second after intercom or receiver activity has finished before rising again to the set volume Do not attempt to feed the speaker output of a car stereo directly into pin 6 The audio level is too high and will damage the audio system of the M760 and void the warranty Input only line headphone level audio E 4 PRIORITY lt SQUELCH Pin 6 Audio signal OF ON OFF VOL ACTIVE Pin 11 12 Audio ground MICROAIR FREQ 4777 ADJUST Ot Xx E The auxiliary audio input is mono M2. C J 114 1014 0 M 4 1014 00 SNOHdO3DI lLO TId OO SNOHdO IOIN 1014 SSNOHAQV3SH 1014 Orany XAY INTITA LSANONINAYM 01507199 LAGNIOIGAVY 8 MOVE 1 SPONOOD L ALNYIAYM THL ANY 094 TAUNI ALMV 10d ISIA TA DNINDIVM 9 HOLIMS JJO NO 1545 ONLLHOITMOVS THL 4 LOTION OL VALID TY V10 TPUSHI PANO TIM F dV 01 LON ANY 4 5 lt 4 4 SLLVM T100HS 109 WHO 8 tp AIHA SH NYO FHL T NOLLOV NI AUVINANOW OL TAY NOLLOS AXOWNDN INV LLdSHL 1 SILON Q Q OL CHYACTOS TAY 5 z e HHL ACIS HHL E HOLOSNNOO 1 dINV 40039993 jv RENI mmm a AMOVT SLOW L annoys aqnnow amp annoys NI SITOA 91 01 NI SITOA 91 01 ONILADITAOVA ATI HOLIAS 4 DNLLHOTTAOVG 114 p XLCECSH TITIM LON SNOHdO3SOIIU SNOHAOSHOIN TELS SNOHdOHOIN S3NOHRHdOXOIN NOLLOANNOD 1 09L7VYl 20 December 2012 Page 34 of 40 M760Q Install amp User Manual O1 R16 Installation a
3. Y 3 x AM LL 4 2 LE E M Jj W i Ke X M M p L3 X mo S e io SS E SORS ET 4 Lr NE m EET 4 i M YA 4 EF io B o y I lo e 2 uz Z O m o z V E n UISLL u4900 utes TOIlanv 0 DE U90G 3 318 OISNW poe 3 AES 1 23 bu ff m y um fs ii uloz 09 X b v JE v V UISLL uJ900 OND QNO W3W dO 42 uloz 909 XH C cSH 1 MOV OAYALS 45 HJAIHOSNVH L 009ZIA 1VId3S 20 December 2012 Page 36 of 40 M760Q Install amp User Manual O1 R16 Microair Avionic 10 0 Radio Type Channels Transmit Channels Receive Frequency Selection Frequency Display Frequency control Memories Dual Monitor Power consumption Input Voltage Power output VSWR Tolerance Receiver sensitivity Receiver Selectivity Squelch Range Data Interface Speaker volume output Headset volume output Aux
4. OF ON OFF VOL TX MICROAIR FREQ P 7 E Data Rate 9600 Baud 8 bit Parity none Stop bit Flow none The M760 supports the basic SL30 command set for transceiver control 51 30 PMRRV2Aiiddacchksm CR LF Request for Data Output SPMRRV29mka chksm CR LF Set Standby Comm Frequency amp Function SPMRRV42mka chksm CR LF Set Active Comm Frequency amp Function SPMRRV20 chksm CR LF Reset function 760 ready for data PMRRV35mkmkas lt chksm gt lt CR lt LF gt 7600 Install amp User Manual 01R16 Page 16 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 12 TRANSCEIVER FUNCTION In both the set standby and set active commands field represents the transceiver function Normal Transceiver receives and transmits on the active M Monitor Transceiver receives on both active and standby and transmits on active 0 2 Unchanged Transceiver function setting not changed Hence it 15 possible for the external equipment if it supports these commands fully to change the active and standby frequencies and switch the M760Q in and out of monitor mode 3 12 2 TRANSCEIVER STATUS The Comm Transceiver Status command contains the field for transceiver s status R Normal receive Normal receiver mode monitor function inactive M Monitor service Monitor function active T Transmit enabled PTT button is down tr
5. Push to talk PTT Button Momentary push transmit function 7600 Install amp User Manual 01R16 Page 19 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 4 1 4 2 4 3 PRIORITY SWITCH The priority switch is a push down switch When pushed down briefly the radio will go into channel mode and select the frequency stored in memory 99 Memory 99 should be considered the priority channel which the user can quickly select when required Memory 99 must be programmed for the priority switch to operate Memory 99 is set at the factory as the international distress frequency 121 500MHz Memory 99 can be programmed the same way as any of the other channels hence the factory default can be edited Refer to section 6 5 to edit this memory The priority channel memory 99 can be edited but not be deleted VOLUME SQUELCH KNOB The M760 is turned on by rotating the volume knob A positive click is heard and felt at the start of the rotation to indicate on off position The volume is increased by rotating the knob clockwise and decreased by rotating counter clockwise The squelch is adjusted by rotating the ring behind the volume knob There is no automatic level set for the squelch however the ring affords a large manual adjustment to suit all situations Rotate the ring clockwise to increase the squelch threshold and counter clockwise to lower the threshold When the squelch is
6. broken 1e the static hiss can be heard the annunciator LED lights green Note This does NOT mean you are receiving a signal ANNUNCIATOR LED The LED operates red or green and indicates the following states Green Squelch is broken or a signal is received Red Radio is transmitting Flashing Red Radio has transmitted for over 45 seconds warning The flashing red signal is designed to draw the pilot s attention to the fact that the aircraft may have a stuck PTT button Transmissions in excess of 30 seconds should be avoided While the M760 is in the program mode menu or memory programming mode the M760 is in its setup state The radio can not transmit or receive while it 1s in the setup state 7600 Install amp User Manual 01R16 Page 20 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 44 MODE SWITCH The mode switch is a push down switch which will cycle through the operational modes of the M760 When pushed down briefly the radio will step to the next operating mode wo fey 2 PRIORITY PRIORITY SQUELCH PRIORITY SQUELCH XO7 ON OFF VOL OF oN oFF VOL M M ACTIVE MICROAIR FREQ MICROAIR MICROAIR FREQ 4777 ADJUST MODE 477 ADJUST ACTIVE STANDBY MODE Refer section 5 1 Press Mode Switch aan CHANNEL MODE Refer section 5 3 Swi Press Mode Switch witch VOX ADJUST Refer section 5 4 3 If
7. 3 characters Once the service type 15 selected or entered press the toggle switch briefly The word SAVED 15 displayed and then the display returns to the Program Menu M760Q Install amp User Manual 01R16 Page 31 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 65 EDIT MEMORY CHANNEL The EDIT MEM function allows the user to program a channel in memory The frequency and airport code stored in each memory channel can be set changed or cleared in this mode 7 ON OFF VOL Using frequency adjust knob scroll through existing memories by location in alphabetical order When the desired memory is displayed press the toggle switch to edit the details Editing 15 done in the same order as a new memory refer 6 4 After editing the M760Q will perform a memory sort to ensure MODE that channels are viewed in alphabetical order The time taken to do this depends on number of channels stored in memory 2 minutes for 99 channels 6 6 DELETE MEMORY CHANNEL From the edit memory channel item to delete the displayed memory press the priority key The word DELETED is displayed briefly before the display returns to the program menu 6 7 EXIT MENU This option exits the program menu and causes the radio to sort the memory channels before returning to last operational Mode SQUELCH Press the toggle switch briefly to exit from the program menu
8. 7 ON OFF VOL If a new memory has been added while operating in the program menu the M760Q will perform a memory sort to ensure the channels are displayed in alphabetical order The time taken to do this depends on the number of channels stored in memory 2 minutes for 99 channels AI IMPORTANT NOTE Do not turn the M7600 off during the memory channel sorting process The channel will not appear in the correct alphabetical order if the process is interrupted wu us v 7600 Install amp User Manual 01R16 Page 32 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 7 0 FAQ S I hear a loud squeal in my headphones when I press the PTT button What is happening If the squeal is heard only when transmitting the likely cause is RF signal getting back into the power or audio wiring Refer to section 3 13 for tips on reducing RF noise I have two different types of headset in my aircraft When I transmit with my headset everyone can hear me OK but when the co pilot headset is used it is hard to hear What can I do The two headsets may have microphone of different performance The quiet headset may require more amplification to be heard properly The M760Q is fitted with MIC GAIN controls for each headset It is possible to adjust upwards the MIC GAIN for the quiet headset to improve its performance without affecting the good headset Refer to section 3 8 for adjustment deta
9. AUTHORISED RELEASE CERTIFICATE 5 30 INSTALLA TION 6 3 1 WIRING natant ba a J 3 2 COAX TERMINA HON Dai Erb eat EU RU MIA OH RU URDU 9 3 3 ANTENNA wm 9 3 3 1 a ONY SR aera 10 3 3 2 METAL SKIN AIRERAMES ees detecte eese eben eet niter 10 3 4 FOWER c ER EUN 11 34 1 piston cd cit cn Rd MODA PUN 11 342 ROWER 11 3 5 MICROPHONE teats aioe toda A A 12 3 5 1 C em c o Dea at Du LL Mb un d 12 3 5 2 iui jo 12 3 6 SPEAKER d M Em 12 ou INTERNAC VOX INTDERCOM 5 4 8 bt tape a tno Mao RUE 13 3 8 HEADSET ADIUS EME NT x ra ento emerat tre tex obtenu 13 3 8 1 opc RR ee en NR 13 3 8 2 GAIN n N E E T 13 3 9 EXTERBNUATINTERCONL T A fond Prev tust 14 3 10 DUAL CONINEINSTAIEIENTION po Qro Repas pepe tne du 14 3 11 AU
10. EU Ep IDEE SIME cabo ban CHA REI 25 5 3 CHANNEL MODE DRE Edu emnes ep oU 27 5 4 C ERES 28 M760Q Install amp User Manual 01R16 Page 3 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 60 PROGRAM MENU 25553 29 6 1 uec 29 6 2 VOA a 30 6 3 MONITOR SE TUP e a 30 6 4 NEW MEMORY CHANNE Coenie a a a a 31 6 4 1 a br ids ea 31 642 SET LOCATION RENEO NE 31 6 4 3 gt td 31 6 5 EDIT MEMORY CHANNEL i tetro hip i dub dept e un nb uei e pes 32 6 6 DELETE MEMORY GHAININ ED rc ionis peu ded aute oet au DRM Unt 3 6 7 lu OMNI SIBI 32 10 m M 33 40 WIRING DIAGRAJM iere en tiae ets eene Yao eoa opa Ek Eon Y Yee veo EE EN Ee o Rao e RR ERE PURSE VR ES NN ERE PUE Ree Vna ao 34 90 NHCROAIR HARNESS Roe Eo EREMO ka ERE NER ee REESE Un RSS REESE ORENSE EURO 35 10 0 SPECIFICATIONS M700 ius eese pae en ee eo 37 11 0 DRILLING DIMENSIONS sssssssssosssscccsascisssossvasecsasecessosssssesscnccedsssssdesosesssesssssesseossseee 38 12 0 LIMITED WARRANTY scsssssss
11. KHz by pressing the frequency adjust knob Once the frequency is set press the remote memory button or the toggle switch briefly Cycle cursor between MHz and KHz by pressing the frequency adjust knob inwards briefly Rotate the frequency adjust knob to change value 6 4 SET LOCATION Using the frequency adjust knob set the name for the selected memory channel The cursor can be cycled through the character positions by pressing the frequency adjust knob Once the name is set press the remote memory button or the toggle switch briefly Cycle cursor between character positions by pressing the frequency adjust knob inwards briefly Rotate the frequency adjust knob to change the character 6 4 3 SET SERVICE Using the frequency adjust knob select the service type for the frequency location from the following list options APP Approach ARR Arrival ATF Air Traffic Frequency ATS Automatic Terminal Information Service AWS Automatic Weather Observing Service AWOS CLR Clearance Delivery CTF Traffic Advisory Frequency DEP Departure FIA Flight Information Area FSS Flight Service Station GND Ground The blank option allows the user to enter a three MF Mandatory Frequency character service description Scroll top the blank PAL Pilot Activated Lighting option and press the frequency adjust knob briefly TWR Tower Frequency h itin rsor UNI Unicom blank User defined service
12. of RFI can be reduced by installing ferrite chokes on the wiring harness Locations for best effect are on the wiring harness immediately behind the DB15 connector at the radio and the microphone headphone lines just behind the headset jacks 3 13 3 SUPPRESSION CAPACITOR Another form of RFI is the impulse noise from equipment like strobe lighting This equipment can create large impulses on the power supply which have RF components These signals can radiate to adjacent wiring to create noise The best defence here is a filter capacitor on the power input to this type of equipment A 0 010 ceramic capacitor with a voltage rating is most suitable for this task Refer to the Microair Avionics website www microair com au for more information on aircraft electrical Systems M760Q Install amp User Manual 01R16 Page 18 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 4 0 OPERATIONAL CONTROLS P Y res PRIORITY SQUELCH X977 ON OFF VOL ACTIVE MICROAIR FREQ MODE L ADJUST Lei Pi 9 4 Front Face Control Column Momentary push down switch Click On Rotate knob for volume Rotate ring for squelch Receiver Transmit Annunciator Red Green LED Mode Switch Momentary push down switch Rotate to adjust value Press to move cursor Momentary push toggle active standby freq s Push amp Hold for 5 seconds activate monitor
13. stubbie rubber duckie antennas meant for use with handheld radios 7600 Install amp User Manual 01R16 Page 9 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 3 1 METAL SKIN AIRFRAMES For metal skin aircraft a wave whip is the easiest antenna to fit Ensure that the antenna base and coax shield are firmly grounded to the skin of the airframe on the inside of the aircraft Ensure that any anti corrosion product which may be used to seal the exterior surface does not isolate the antenna base from the airframe For best performance the whip should be straight and vertical when mounted on the airframe Refer to the Microair Avionics website www microair com au for more detail on antennas suitable for metal skin airframes 3 3 2 NON METAL SKIN AIRFRAMES For non metal airframes 14 wave whip may still be used but a ground plane must be installed on the inside face of the aircraft skin The ground plane should ideally be circular and as a minimum have a diameter of half the height of the whip The ground plane should be fabricated from a lightweight metal eg thin aluminium sheet For best performance the whip element should be as vertical as possible An alternative antenna for non metal airframes is the Ground Plane independent dipole This antenna is physically similar to 14 wave whip but has a small flexible stub antenna pointing downwards from the antenna base The st
14. the internal VOX intercom has been disabled in program mode menu intercom adjust mode will be skipped See section 6 2 to enable disable the internal VOX intercom By holding the mode switch down and turning on the M760 will start in PROGRAM MENU refer section 6 0 45 TOGGLE SWITCH When the toggle switch is pressed briefly in Active Standby mode the active and standby frequencies exchange places Hold the toggle switch down for 3 seconds to activate the monitor function When the M760 is in monitor mode press the toggle switch briefly to disengage the monitor function e When the M760 is in channel mode the toggle switch is used to quick save the frequency The toggle switch is also used in the PROGRAM MODE for programming functions M7600 Install amp User Manual 01R16 Page 21 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 4 6 FREQUENCY ADJUST KNOB The frequency adjust knob is used to change display values and characters Rotate the knob to scroll values or characters up or down Press the frequency adjust knob inwards briefly to move the cursor to the next display item to adjust In the active standby mode only the standby frequency can be changed directly the active frequency cannot be directly altered by the frequency adjust knob Cursor In channel mode the user can scroll alphabetically by turning the frequency adjust knob The user can scroll alphab
15. vary depending on the impedance Ohms of the headphone modules Most headsets are fitted with 2 x 300 Ohm modules 600 Ohm total Some headsets can have headphone impedance as low as 150 Ohms The M760 will produce a maximum audio output of 100mW into 150 Ohms This reduces to 60mW for 300 Ohms and 30mW for 600 Ohms SIDETONE Adjust the sidetone if necessary for good volume level in the headset using the intercom Ensure that the headset volume adjust typically a knob located on the headset ear cup is set to mid range so the volume can be adjusted up down by the user MIC GAIN Adjust the microphone gain if necessary for best audio quality not volume level when transmitting The M760Q is fitted with separate mic gain trimpots to allow for adjustment of individual headsets Punch the black dot carefully with a screwdriver blade to expose the slotted plastic head of the trimpot located appox 3mm 1 8 below the surface of the casing Note the position of the slot before making adjustments Use a small flat bladed screwdriver to make adjustments before testing with a headset again The total movement of all trimpots is only 300 degrees 4 59 turn The factory setting positions trimpot slots at 10 O clock Mic Gain WARNING REVERSE POLARITY WILL DAMAGE RADIO Mic 1 AND VOID WARRANTY Mic 2 e Sidetone STRAIGHT BLADE SCREWDRIVER WITH INSULATED SHAFT Q ES 3 INCREASE DECREASE TOTAL TRIMPOT MOVEMENT IS 300 DEG
16. 0 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 6 2 VOX When VOX intercom is set ON the M760 user is able to set the threshold of the internal VOX intercom via intercom adjust screen See section 5 4 SQUELCH 7 ON OFF VOL When VOX setup is set OFF the M760 will set the internal VOX intercom to its maximum threshold and disable the Intercom Adjust screen Press the toggle switch to turn the VOX function ON OFF MICROAIR zd ADJUST cs AI IMPORTANT NOTE 6 For installation where an external intercom is to be used the M760 s internal VOX intercom MUST be turned OFF am v 6 35 MONITOR SETUP MONITOR setup allows the user to adjust the sample interval of the monitor function which allows the user to detect radio traffic on both the active and standby frequencies When receiving a signal on the standby channel the M760 will sample the active channel regularly for signal The MON value represents the rate of the sample Background The M760 can monitor the active and standby frequencies but priority is given to the active When a signal is received on the standby frequency the active frequency is sampled to see is NECS y freq y frequency p PRIORITY there is signal present ON OFF VOL The M760 will quickly change channels to check the active for signal even if the standby is receiving a signal The user will perceive thi
17. Microair Avionics 4 6 Microair Avionics Pty Ltd Airport Drive Bundaberg Queensland 4670 Australia 61741 553048 AVIONICS Fax 61741 553049 e mail Microair Avionics M760 Transceiver Installation amp User Manual AVIONICS About This Document This manual describes various installation configurations available for the Microair M760 Transceiver The Transceiver s controls and design features are described and illustrated This is a controlled document and may not be amended copied or distributed without the prior consent of Microair Avionics Pty Ltd Microair Avionics Pty Ltd Ensure that the M760 transceiver is switched off during engine starting and stopping to avoid damage occurring PRIORITY ACTIVE STNBY MODE CURRENT REVISION STATUS mn ST v SQUELCH oN oFF NOL MICROAIR FREQ lt lt ADJUST ET zi P UdfrmWionB E repair microair com au added to Warranty Statement M760Q Install amp User Manual O1 R16 Page 2 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual TABLE OF CONTENTS LO JINTRODUGCTIGO S ai veste tiae ta 5 20 UNPACKING iic PEE OR PENES nr EE PP 5 24 USERSJINSTALCMANUA Lituanie UM DESAIN READ MERE 5 2 2 NAMEF LATE DETAI S 5 2 3
18. Phone 46174155 3048 Fax 6174155 3049 Email repair microair com au Website WWW microair com au M760Q Install amp User Manual 01 16 Page 39 of 40 20 December 2012 Supplied by
19. REES ROTATION 7600 Install amp User Manual 01R16 Page 13 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 9 EXTERNAL INTERCOM Where the M760 is to be installed with an external intercom the internal VOX intercom should be disabled in the Program Mode Menu See section 6 2 Wire only a single mic line pin 1 along with the PTT pin 7 the headphone pin 14 and a ground line pin 11 or 12 to the intercom Follow the intercom manufacturer s instructions for further installation Wire the remote memory line pin 13 directly to the remote memory button location This line 15 NEVER connected to the external intercom Refer to Microair Avionics website www microair com au for more details and wiring diagrams with commonly used intercoms 3 10 DUAL COMM INSTALLATION Where two M760 s are to be installed in the aircraft the interlock or suppression lines must be installed Each interlock line shall be wired from pin 4 on the first radio to the PTT line pin 7 on the second radio and vice versa The interlock lines allow a radio to sense when the other radio 15 transmitting and deactivate to prevent any chance of damage or allow distortion noise to occur Microair recommends the use of a clearly labelled rotary selector or multi pole switch to switch the microphone and PTT lines Refer to the Microair Avionics website for additional wiring diagrams www microair com au
20. XILIARY AUDI O TN 15 3 12 DATA INTERFACE SLO ich 16 3 12 1 TRANSCEIVER Cote MA IM OM bol 17 3 12 2 SN 17 3 13 NOISE SUPPRESSION tbi dup rt ente rape p M on Ene tesa 18 3 13 1 EON eM 18 3 13 2 FERRITE CHOKE cana atlas 18 3 13 3 SUPPRESSION OVAN 7O u KO 18 40 OPERATIONAL CONTROLS naso E eel NN ER EHE rep esu eua 19 4 PRIORLEY RISO RAM EOD MR MSS uten 20 4 2 VOLUME ZSOUEECII KNOB ubi Up REN Hn ODE NE 20 4 3 ANNUNCIA TOR LED eno ouo b PS vaP bn Ond bobubl eu tU eR E 20 4 4 MODE SWIMM erc eee 21 4 5 TOGGLE a i ences quem ERE es eMe pee Peewee 21 4 6 ERBOUENCY 3DIUST KNOB 22 4 7 REMOTE MEMORY BUTION ras vin PU 23 4 6 PUSH TOTACKEBUTTON Minn einn cut 23 20 OPERATIONAL MODES 24 5 1 ACTIVESTANDB Y MODE seretii eda 24 5 1 1 MHZ elec eh 24 32 MONITOR FUNCTION epe
21. a C TERMINALS Refer to the Microair Avionics website www microair com au A x 7 CONNECTOR RADIO END microphone types and wiring e configurations SPEAKER Microair recommends using a speaker of 8 ohms impedance rated at a minimum of 5 watts The speaker is wired to the speaker line pin 15 Do NOT attempt to connect a speaker to the headphone line pin 14 Likewise do NOT attempt to connect the headphones to the speaker line Microair recommends SPO Box Speaker The SPOI has a durable thick film plastic cone of 8 ohms and is rated at 5 watts The SPOI is fitted with a mounting bracket and 1 5m of screened cable Check your speaker installation by ensuring the audio is clear all the way up to full volume Page 12 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 7 3 8 3 8 1 3 8 2 INTERNAL VOX INTERCOM The 760 is fitted with a VOX intercom feature which utilises the sidetone facility of the radio The VOX threshold level 15 controlled in software by use of the VOX Adjust Mode See section 5 4 to adjust the internal VOX intercom HEADSET ADJUSTMENT It is important to ensure that the sidetone and mic gain are set to the correct levels for best headset performance The sidetone level will set the intercom s headset volume The mic gain will set the level of microphone sensitivity for each headset Maximum audio volume will
22. ansmitting S Stuck mic Transceiver transmitting for longer than 45 seconds F Comm failure Transceiver inoperative AI IMPORTANT NOTE E 2 After 45 seconds of transmission the 7600 will flash the red LED TX annunciator During this period the transceiver status will default s to S stuck mic wu ug v 7600 Install amp User Manual 01R16 Page 17 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 13 NOISE SUPPRESSION After installation there may be unwanted noise present in the radio s audio system There a variety of sources for this noise but they usually fall into one of two categories e Electro Magnetic Induction EMI Radio Frequency Induction RFI 3 13 1 POWER FILTER EMI typically affects radio equipment by inducing noise on to the power supply Microair recommends the installation of a power MODEL NF 5 filter on the power wire to the M760 A simple line filter is NOISE FILTER u sufficient to ensure that the voltage is smooth and causes no interference to the radio If engine noise can be heard and it rises and falls with the RPM install a power filter Refer to the Microair Avionics website www microair com au for more information on aircraft electrical systems 3 13 2 FERRITE CHOKES RFI typically affect radio equipment by radiating RF noise into the wiring The most vulnerable are the microphone headphone speaker and power lines The instance
23. ceiver Installation amp User Manual 6 0 PROGRAM MENU The M760 can be started in program mode by holding the mode switch down and turning on The mode switch must be held down while the display goes through the start up sequence and ends with PROGRAM MENU on the display Rotate the frequency adjust knob to scroll through the Program Mode Menu items Use the remote memory button or the toggle switch to select the menu item PROGRAM MENU CD VOX MONITOR NEW MEM EDIT MEM EXIT 61 CDLOCKOUT When CD Lockout is set ON the M760 will not permit the PTT button to operate if a radio signal is currently being received PRIORITY SQUELCH If the user attempts to transmit by pressing the PTT ON OFFVOL button the M760 will not transmit The signal being received will be heard in the headphones or speaker MICROAIR FREQ When CD Lockout is set OFF the M760 will permit 4777 ADJUST the PTT to operate if a radio signal is currently being U P received Background In high traffic areas such as circuit patterns there is often a high level of radio traffic There is also a high instance of two aircraft trying to transmit at the same time When this occurs the two transmissions interfere with each other and neither call can be properly received The CD Lockout is toggled by pressing the Toggle Switch The factory default is to have the CD lockout OFF 7600 Install amp User Manual 01R16 Page 29 of 40 2
24. cs Website www microair com au for more installation information NAMEPLATE DETAILS The M760 has a nameplate fixed to the bottom plate of the chassis The Nameplate records the M760 s part number revision and serial number Microair recommends M760 serial number noted in aircraft s maintenance records for future reference AUTHORISED RELEASE CERTIFICATE The CASA form 1 release note is an internationally recognised document which clearly identifies the part component the form 1 is associated with Please keep this certificate with the aircraft s file or log book 7600 Install amp User Manual 01R16 Page 5 of 40 20 December 2012 Microair Avionics M760 Transceiver 3 0 INSTALLATION Installation amp User Manual The M760 has a simple physical installation for aircraft instrument panels Select cut a 57mm 2 4 instrument hole for mounting refer panel drilling template in section 11 0 For panel locations which do not afford sufficient space behind the radio to reach the connectors Microair recommends connecting the wiring harness and coax cable before fitting the radio to the hole in the panel Present the M760 to the rear face of this hole The stepped round face will insert through the hole and should appear flush with the front of the instrument panel when correctly positioned Rotate the M760 to align the four M4 machine screws Loose fit all four screws For installations wh
25. eiver Installation amp User Manual 12 0 LIMITED WARRANTY The warranty period for any Microair Avionics manufactured article is dependant on Condition of the article at time of sale and the Purchase Date For New Articles the warranty period commences from Date of Purchase and is valid for two years or the minimum period defined by applicable consumer law whichever is the longer In the absence of original Proof of Purchase warranty will be valid for two MICROAIR years from Date of Factory Shipment as determined by Microair AVIONICS Avionics For Factory Reconditioned Articles offered for sale the warranty period commences from Date of Purchase and is valid for twelve months For Factory Exchanged Articles the warranty period commences from the Date of Purchase of the original article and 15 valid for the remainder of the original warranty period For Repaired Articles the warranty period commences from the date of Factory Shipment and 15 valid for 6 months for the original defect only Microair Avionics will at its sole discretion repair or replace any components which fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labour The customer shall be responsible for any transportation costs for return of this product to Microair Pty Ltd or an approved Microair Service Centre This warranty does not cover failures due to abuse misuse accident unauthorised alteratio
26. ere the existing instrument panel screw holes are 1 8 the holes will need to be enlarged to 5 32 to fit the M4 machine screws Insert and tighten all four M4 machine screws The 760 requires rear support the M4 screws provide all of the physical mounting required The M760 should be located in the aircraft within view of the pilot seated in the pilot in command position and afford this pilot good access to the front face controls v 2 e PRIORITY ACTIVE PRIORIT CH OFF VOL M ACTIVE 0 CROAIR FREQ MICR at Do NOT oversize the mounting holes in the front face of the radio internal components and cause damage Either of these actions will void the warranty 7600 Install amp User Manual 01R16 Page 6 of 40 to an imperial size Drilling will damage internal components Do NOT replace the M4 machine screws supplied with the radio with longer screws Over length screws will touch or even crush 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 31 WIRING Microair recommends the use of the wiring in the table below for the various parts of the radio harness Pin ER i l Pilot Microphone 6 Auxiliary Audio Input 22 awg single core shielded 8 Backlighting Tefzel22awg gt 000000 9 Powr __ Tefzl22awg 00 Tefzel 22 awg Tefzel 22 awg Tefzel 22 aw
27. etically through stored memory J MHz Lo KHz channels by airport ID YBUD and radio service type Refer to section 6 4 for the input and section 6 5 for the amendment of a memory channel In VOX mode the threshold level can be adjusted up or down by turning the frequency adjust knob Adjustment is restricted to values between 1 mic on continuously and 42 very insensitive shout Channel Frequency CUN Channel Name U J Threshold Level P fey PRIORITY X977 ON OFF VOL MICROAIR FREQ 4777 ADJUST E SQUELCH f 97 oN oFF VOL M 7 MICROAIR FREQ 4 ADJUST LJ PRIORITY mee 97 ON OFF VOL M ACTIVE 7 6 0 MICROAIR FREQ ADJUST 20 December 2012 M760Q Install amp User Manual 01R16 Page 22 of 40 Microair Avionics M760 Transceiver Installation amp User Manual 4 7 REMOTE MEMORY BUTTON If fitted at installation the remote memory button will have the same functionality as the toggle switch on the display It will allow the user to toggle exchange the active and standby frequencies The remote memory button is typically mounted next to the PTT on the stick 4 If remote memory button is held down for 3 seconds while in the active standby mode monitor function is activated Refer to section 5 2 for complete details on monitor function I
28. g two core shielded with PTT Headphone Tefzel 22 awg single core shielded Pilot amp Co pilot Speaker Tefzel 22 awg single core shielded Aerial RG58C U 50 ohm Coaxial Cable wiring is connected by soldering to the DB15 connector Inspect the solder cup side of the DB15 carefully to determine the pin numbering 9 444 219992978 Strip the insulation back 2mm 1 16 and tin exposed conductor with solder Slide a 5mm length of 1 6mm 1 16 heatshrink tubing over the end of the wire After checking the wiring diagram for the correct pin number push the tinned end into the tinned solder cup and solder into place Check the soldered joint has been made by gently pulling on the wire Slide the heatshrink tubing down over the soldered pin to completely cover the conductor Ee Bare Wire Stripped Wire Soldered Wire Tinned Solder Cup Solder Wire to Cup Heatshrink 7600 Install amp User Manual 01 16 Page 7 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual Cover the soldered joints with the grey plastic backshells Ensure that the thumbscrews are in place before closing the backshells Connect to the rear of the radio with a push fit and secure the thumbscrews top and bottom Microair recommends the use of its pre wired M760 harness The harness is available from Microair and comes complete with all switches sockets but
29. iliary Audio Temperature range Stability Dimensions Exposed dial face Weight M760Q Install amp User Manual O1 R16 M760 Transceiver Installation amp User Manual SPECIFICATIONS M760Q Amplitude Modulation AM Aircraft Transceiver 760 channels 25KHz spacing 118 000 136 975MHz 1160 channels 25KHz spacing 108 000 136 975MHz VFO dial 2 line alpha numeric LCD display with backlighting PLL frequency synthesis which is microprocessor controlled Memory is store in non volatile EPROM 99 programmable memories 100ms Scan Time Receive no signal Transmit 140 mA no backlighting LOA 10 7 16 0 Volts Warning damage will occur above 16 Volts 5 watts nominal lt 2 1 for best operation 5 1 without damage 12dB SINAD 0 3uV IKHz audio with 70 modulation 704 0 5 10 0uV RS232 Nominal 4 watts output to 4 ohms 100mW into 150 Ohms 60mW into 300 Ohms 30mW into 600 Ohms maximum audio output Line level audio 20 to 55 degrees Celsius lt 3 00ppm W 65mm H 59mm D 135mm plus 35mm for harness W 2 60 H 2 3 D 5 3 plus 1 5 for harness 57mm diameter 2 14 diameter 416 grams 14 7 ounces Page 37 of 40 20 December 2012 Microair Avionic M760 Transceiver Installation amp User Manual 110 DRILLING DIMENSIONS tmm i UN Drilling Template not to scale M760Q Install amp User Manual 01R16 Page 38 of 40 20 December 2012 Microair Avionic M760 Transc
30. ils I am using M760Q as COMI and a Microair converted CB radio as COM2 When I switch to the UHF there is no intercom or sidetone What is wrong There is nothing wrong The UHF CB radio is a conversion of a vehicle based product where the radio is configured to operate with a hand microphone and a speaker The radio has no intercom or sidetone facility in built for this reason I use the dual monitor function When my friend calls me on my chat channel I discover I am transmitting back to him on other channel What s going on The dual monitor function allows the pilot to receive signals on either the active or standby channels The transmitter however is always set to the active channel regardless of which channel the last call came in on Another point about the dual monitor to note 15 the priority given to signals on the active channel The monitor function will continue to check for signals on the active channel even when receiving a signal on the standby channel If a signal is detected on the active channel the M760Q will drop the signal on the standby channel as switch over to the active 7600 Install amp User Manual 01R16 Page 33 of 40 20 December 2012 Installation amp User Manual M760 Transceiver Microair Avionics WIRING DIAGRAM 9 0 8 ILON LILON W323IV3dS NISVO NOLLOS XXOYUJUSLOPUDd NOLLOS XXOYUDUSLOYUGI Lid LOTA ND
31. l 01R16 MICROPHONE M760 Transceiver Installation amp User Manual The M760 can be operated with an Electret Insert or Amplified Dynamic microphone These alternatives cover most aviation headsets and hand microphones When the PTT is pressed both microphones are live To reduce background noise the M760 can be installed with relays across the mic lines and the PTT line to allow only one microphone at a time to operate ELECTRET Electret microphones are the most common microphone in use on aviation headsets They are small in size and can have noise cancelling capability It is important to wire the Electret microphone with the correct polarity The Electret will only work if the positive and negative are wired correctly Electrets are a high signal device and do not normally require amplification Some headset manufacturers elect to use an amplifier to improve the Electret s response and to provide some noise filtering DYNAMIC Dynamic microphones are a low signal device A dynamic microphone will not operate directly with an 760 radio because of the low signal produced For operators wanting to use a dynamic microphone a mic amplifier must used Microair recommends the installation of the Microair MD 01a amplifier This amp is compatible with 150 600 ohm dynamic microphones B ao further details on LINES TO DYNAMIC MIC OR MIC JACK CONNECTOR MIC END B MD 01
32. mp User Manual M760 Transceiver Microair Avionics MICROAIR HARNESS OPTIONS 9 0 BMP jaued syoe jespeau uj yeas yeJoure 097 L BEOLMYN 4 ES wT lo phy UU 6 1 ud utgg HINVN3 IS I Op 9 r9 MOV O3MN3LS SISNW xnv p 3 eet Lo ee 2 x 2 P dios s T Wu 909 o m E V M 6 W900 0 Uc Fol i fo x T SU FS M K gN y Y 4 24 ELE me E ia NU per ES X XX o o rs X E A r4 m l N li x IM X NN P fe NN MOV 0234315 vliva 1 35 Wr XL c cSu 3919 009ZIN 20 December 2012 Page 35 of 40 M760Q Install amp User Manual O1 R16 Installation amp User Manual M760 Transceiver Microair Avionics DMp 1Id209 Jee je syoef jespeeu uj eas OM L EOZLAAVIW AWYNATI4 1 p paco Bi 3 bU rd KA W
33. n or repairs carried out by parties other than Microair Avionics or an approved Microair Avionics Service Centre This warranty does not cover failures where the product has not been installed or operated in accordance with the provisions of the User and Installation manual s It shall be at Microair Avionics sole discretion to decide if a defect is a result of material or workmanship failure THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY LIABILITY ARISING UNDER WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE STATUARY OR OTHERWISE THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS WHICH MAY VARY FROM STATE TO STATE AND COUNTRY TO COUNTRY IN NO EVENT SHALL MICROAIR AVIONICS PTY LTD BE LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT Microair Avionics may at it discretion refer product returns for repair or service to a service facility closest to you Microair Avionics reserves the right to repair or replace the product or software or offer a full refund of the purchase price at its sole discretion To obtain warranty service please email or call the Microair Avionics Repair line in Australia Domestic or International Return instructions are available on our website Please follow these instructions carefully
34. n channel mode press the remote memory button briefly to cycle through the stored memory channels When the M760 is in VOX adjust mode press the remote memory button briefly to increase the VOX threshold Remote Memory Button Wil ME Zz IMPORTANT NOTE The remote memory button is highly recommended It allows the user to keep hands on the controls during flight while changing channels or mode am v 4 8 PUSH TO TALK BUTTON The push to talk PTT button causes the M760 to transmit on the active frequency or selected memory channel During transmission the LED annunciator will light red and the user will hear themselves speaking through their own headphones via the sidetone system The M760 will not transmit if the active frequency or selected memory channel is below 118MHz The M760 will not transmit if the lockout function 15 enabled and the M760 is currently receiving a signal See section 6 1 to enable disable the CD lockout function PTT Button M760Q Install amp User Manual 01R16 Page 23 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 5 0 OPERATIONAL MODES The M760 transceiver can operate in several operation modes The user can step through these modes by pressing the mode switch briefly Operational modes are gt Active Standby Mode Channel Mode gt VOX Adjust Mode 51 ACTIVE STANDBY MODE The display shows the active or in u
35. ob to scroll alphabetically through the memory channels 7600 Install amp User Manual 01R16 Page 27 of 40 20 December 2012 Microair Avionics M760 Transceiver 5 4 VOX MODE The M760 has a digitally controlled VOX intercom VOX stands for voiced activated which means the intercom function will trigger automatically when the user starts speaking into the microphone It is important to set the threshold level to trigger on the microphone If the VOX level is too low the microphones will always be on and the user will hear the cabin noise continuously hot mic If the VOX level is too high the user will not be able to easily trigger the microphones shout to activate Press the mode switch until the VOX adjust screen is displayed and set the VOX threshold to the desired level It may be necessary to readjust this level when the aircraft is Operating at full power When the VOX is adjusted to the microphones will be on all of the time hot mic When the VOX is adjusted to 30 the microphones will require a very loud voice to activate shout Installation amp User Manual 5 PRIORITY men SQUELCH O7 ON OFF VOL ACTIVE MICROAIR FREQ ADJUST Microphone Open mnm VOX Threshold Ambient Noise When in VOX mode the active frequency is displayed on the top line 7600 Install amp User Manual 01R16 Page 28 of 40 20 December 2012 Microair Avionics M760 Trans
36. ost music sources will have a stereo output consistent of left L and right R audio channels L and R audios must be combined before connection to pin 6 of the M760Q 1K L AUDIO MONO AUDIO M760Q PIN 6 STEREO AUDIO SOURCE 1K The auxiliary audio can be used to input the altitude alert warnings from the Microair T2000SFL transponder v 1 SQUELCH o0 WO ON OFF VOL 9 MICROAIR PRIORITY T2000SFL M MICROAIR FREQ ON CODE SELECT STNBYe eALT Pent ADJUST SSP ALT gt DISPLAY x gf 4 7600 Install amp User Manual 01R16 Page 15 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 3 12 DATA INTERFACE SL30 The M760Q is SL30 compatible and allows the user to change the active and standby channels from EFIS equipment The M760Q can also be put in and out of dual monitor mode if the EFIS equipment supports this type of function Some types of EFIS equipment do not support 5130 in both directions ie the user can change channels at the EFIS and the M760 will update but the user cannot change channels at the radio and have the EFIS update The 760 supports all modes of SL30 except the frequency list upload function All other SL30 comm commands are supported in both directions The 5130 data connection 15 made via an RS232 data interface Pin 2 RS232 RX Pin 5 RS232 TX Pin 11 12 Ground re P LY fey PRIORITY SQUELCH
37. s sample action as a small click in the received audio on the standby channel ACTIVE If no signal is found the receiver returns to the standby AGUS frequency When a signal is detected on the active frequency yi Gl the M760 will lock to the active even if there is a signal E 7 present the standby frequency The MONITOR setup can adjust the sample rate by pressing the Toggle Switch to increase the sample rate value The adjustment is restricted to values between 1 and 9 From 9 the value will revert back to 1 The factory default is an interval of 5 7600 Install amp User Manual 01R16 Page 30 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 6 4 NEW MEMORY CHANNEL This option allows the user to program a new channel into one of 99 memories The next available memory will automatically be selected p SQUELCH 7 ON OFF VOL To load a new channel the user must enter the frequency location and service type The location is typically the airport ID but the user may enter any 4 character description The service type can be selected from a list or the user can enter any 3 character description FREQ ADJUST Press toggle switch briefly to enter the NEW MEM function 64 1 SET FREQUENCY Using the frequency adjust knob set the frequency for the selected memory channel The cursor can be cycled through the MHz and
38. scillate up and down to indicate that the monitor function 15 active MICROAIR FREQ MODE s ADJUST A signal can be received on either the active or the standby gt frequency An R character will appear beside the channel receiving the signal While receiving a signal on the active frequency the standby channel is NOT monitored While receiving a signal on the standby frequency the active channel is periodically monitored If a signal is found on the active frequency the M760 will revert to the active frequency After a signal has been received the M760 will return to monitoring both frequencies N IMPORTANT NOTE lt o The user can only transmit on the active frequency If the PTT is pressed the radio will transmit on the active frequency only A v M760Q Install amp User Manual 01 16 Page 25 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual Monitor mode can be cancelled by pressing the remote memory button or toggle switch briefly The M character is no longer displayed at the right hand side of the display If the mode switch is pressed to move from active standby mode to channel mode the monitor function is disengaged Monitor Mode Monitoring on ACTIVE frequency Monitor Mode Monitoring on STANDBY frequency Monitor Mode Receiving on ACTIVE frequency Monitor Mode Receiving on STANDBY frequency Monitor Mode Transmi
39. se frequency on the top line The standby frequency is displayed on the bottom line Only signals on the active frequency are received Transmissions can be made on the active frequency by pressing the PTT button The active and standby frequencies are swapped by pressing the remote memory button or the toggle switch The standby frequency can be changed by scrolling the frequency adjust knob The cursor can be moved between MHZ and KHZ positions by pressing the frequency adjust knob Press the mode switch to toggle the display from Active Standby mode to Memory mode 511 108 TO 118 MHZ TUNING The pilot can select channels in the navigation NAV band from 108 000MHz to 117 975 MHz The M760 will receive only on these channels the PTT button is disabled Many civil aviation authorities are now allocating voice services such as ATIS in the NAV band A IMPORTANT NOTE m 2 When the active frequency is set below 118 000MHz the transmitter is disabled wu ud v 7600 Install amp User Manual 01R16 Page 24 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 5 20 MONITOR FUNCTION By holding down the remote memory button or toggle switch for 3 seconds and then releasing the M760 will enable monitor Se 5 gt function PRIORITY SQUELCH 97 oN OFF VOL Both active and standby frequencies are monitored at the same time for a signal ACTIVE An character will o
40. sscadstesicccccsssescestetacesensdcadscossessecssessenseaeacesensadadsceosonsseeses 39 M760Q Install amp User Manual 01R16 Page 4 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 1 0 INTRODUCTION Thank you for purchasing this Microair product The M760 is a 760 channel VHF aircraft transceiver packaged to fit a standard 57mm 2 4 instrument hole The M760 has been produced in accordance with CASA approval E2000 004 2 0 2 1 2 2 2 3 UNPACKING The M760 is boxed in polystyrene for physical protection and wrapped in an anti static bag for electrical protection Once the box is opened and the radio unwrapped the owner is responsible for physical and electrical protection Enclosed with the radio are User Install Manual CASA form 1 release certificate DB15 solder plug and backshell USER INSTALL MANUAL Please read this manual completely before attempting to install or operate this radio There are several installation options you may wish to consider which are clearly laid out in the installation section AI IMPORTANT NOTE mu 2 This manual be used as technical data to support an installation under the FAA form 337 process nd v The 760 has all of the basic radio operations and many other management and programming options which are described in the operation and memory sections of this manual Please refer to the Microair Avioni
41. tons and mounting hardware Separate lines have been wired for Pilot and Co pilot Headphone Microphone Remote Memory M760Q Install amp User Manual 01 R16 Page 8 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 6 5mm 1 4 3 2 COAX TERMINATION The coax is cut to length and terminated in connector Soldered or crimp type connectors are preferred to the solderless variety as they have lower signal loss and better shielding 3 2mm 1 8 Microair recommends using only soldered or crimped BNC connectors Solderless BNC connectors are NOT recommended as their performance is not good enough for VHF transmissions H 3 3 ANTENNA For certified aircraft M760 should only be operated with a TSO compliant antenna The CALIBRATION antenna may be 1 4 wave whip or 2 wave dipole using 50ohm coaxial cable and BNC connector for connection The VSWR should ideally be less than 2 1 across the 118 000MHz to 136 975 airband For non certified aircraft using a non TSO Gum RANGE FUNCTION POWER compliant antenna the VSWR must be checked to ensure the ratio does NOT exceed 3 1 on 118 000MHz 127 000MHz and 136 975Mhz The Mesas M760 will tolerate a VSWR of 5 1 without injury to the transceiver but the performance is severely deteriorated Do not use
42. tting on ACTIVE frequency 7600 Install amp User Manual 01R16 Page 26 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 5 3 CHANNEL MODE The M760 has a memory database which can store up to 99 channels a e PRIORITY y SQUELCH Each channel can be programmed with any available frequency from 108 000MHz to 136 975MHz and is named with a 4 character location and 3 character service description 97 ON OFF VOL Refer to the PROGRAM MODE Menu sections 6 4 MICROAIR amp 6 5 for the programming of memories FREQ MODE 4777 ADJUST EP Channel Frequency Location gt Service When operating in channel mode the programmed channels can be scrolled through alphabetically by rotating the frequency adjust knob or by pressing the remote memory button Only programmed memories are displayed When changing operational modes the Active Frequency is carried forward to the next mode to avoid an accidental change in channel When the operational mode is changed to channel mode the M760 will check all memory channels for the current active frequency If it finds the current active frequency it will display the memory channel that corresponds to the current active frequency If the current active frequency is not found in any memory channel a will be displayed on the bottom line The user can use the frequency adjust kn
43. ub section of the antenna takes the place of the ground plane and simplifies installation Avoid mounting locations which position the antenna parallel to nearby metallic airframe structures such as tube framing brackets ribs or frames Metal objects which are close and parallel to the antenna will adversely affect performance If the installation has two radios the two antennas should be separated horizontally by at least the length of the antenna In the case of airband antennas this should be approx 1m 3ft The further apart the better Beware of fabric surfaces with silver dope finishes The silver dope is a conductive surface and will screen antennas which are mounted internally Refer to the Microair Avionics website www microair com au for more detail on antennas suitable for non metal skin airframes 7600 Install amp User Manual 01R16 Page 10 of 40 20 December 2012 Microair Avionics M760 Transceiver Installation amp User Manual 34 POWER The 760 is designed to operate on a 14V aircraft electrical supply The radio will operate down to 10 7V on receive It is unlikely that a power supply operating below 11V would have sufficient power to allow clear transmissions The M760 will draw up to 1 9A when transmitting Low voltage will produce a BURRRRRRRRRR signal on transmit NEVER operate the M760 on voltage exceeding 16V Damage will occur if the M760 is operated from power supplies which exceed 16V e
44. ven for very short transient periods Operation on a supply which exceeds 16V will void the warranty The M760 has a FET switch and internal fuse to protect against reverse polarity If reverse polarity is applied the internal fuse 4A will blow Damage however may not be limited to the fuse Check your wiring Always check the voltage at the DB15 BEFORE it is plugged into the radio Please ensure that the correct polarity is observed The most common reason for reverse polarity is misreading the pin assignments on the DB 15 connector Applying reverse polarity to the M760 will void the warranty Use a multi meter to check the voltage at the following pins Positive Pin 9 Negative Pin 11 Positive Pin 10 Negative Pin 12 3 4 1 BACKLIGHTING The backlighting is activated by taking input supply voltage to pin 8 This line can be individually switched outside the DB15 connector to enable the backlighting to be turned off 3 4 2 POWER SAVINGS For installations operating from a battery only Microair recommends saving battery power by NOT wiring the backlighting do NOT wire pin 8 The backlighting will draw an additional 80mA of power This nearly doubles the standby power demand Not connecting the backlighting can effectively double the running time on your battery 7600 Install amp User Manual 01R16 Page 11 of 40 20 December 2012 Microair Avionics 3 5 35 1 3 5 2 3 6 M760Q Install amp User Manua
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