Microair 760 Manual - Pittsburgh Soaring Club
Contents
1. 4 Install ERE 4 Warranty Card Release Note vacate due vba DES CLIPUOMN s issssensssdesccecissesnandecdscecassonevsceondedcacesensdscbasedencesenssdoasesdecsdeentcobevossuassundccansesdesssevasessnsedecsesosessd 02 220 5 Physical Installation 142 4 tseAted atl babii Electrical Installation Metal Skin 415 ee RA asd II ER 8 Non Mea SKIN ames 8 Back de cutest da toutes aS 9 Power Savings ie de eel dei 9 Microphones suc a eA Ree Se ois ee eel ee eae 10 Intercom SAEN E AR 11 LUI Joo 11 Control PUN CUO sis ccccicscse2. 2 L Appendix Drilling 22 Limited 25050 0 2 Revision 3 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Introduction Thank you for purchasing this Microair product The M760 is a 760 channel VHF aircraft transceiver packaged to fit a standard 57mm 2 1 4 instrument hole The M760 has been produced in accordance with E2000 004 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 Warranty Card 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 The M760 has all of the basic radio operations and many other management and programming options which are described in the operatio
3. 5 AOA T WODAALNI ANV LINSNVAL JO 144 SMOTIV NOLLVUNDIANOD SIHL NOWWOO SV SAHOLIMS LLd OL ANIT AHL ANY SANIT 11 4 ANV HOLIMS 1445 NV SI HOLIMS YOLOATAS JHL 1 SALON 45 NI VO NOLIN AUOWAN ILONGA ILINSNVAL NOONALNI 114 1014 LINSNVAL NOOYNALNI 114 10114 00 y o a HOWLIMS ONILHOITAOVE SHNOHddVdH 10194 09 e 114 _ 5 4 LOTId WOOUSLNI HOLIMS YOLOATAS ANOHdOADIWN 10114 02 ANOHdOUIW LOTId 4 NI SLTOA 91 01 dWV ST I 01 WOU UOLOANNOD SI A 51 6 46 4 NISLTOA 91 01 NISLTOA 91 01 20 ONILHOITAOVE 114 LON LON OIN NOILOANNOD 61 80 09L YW MA 760 DB 15 CONNECTION MICROPHONE MIC GROUND MICROPHONE NOT WIRED INTERCOM NOT WIRED PIT LED BACKLIGHTING 10 16 VOLTS IN 10 16 VOLTS IN GROUND GROUND REMOTE MEMORY HEADPHONE SPEAKER 9 15 DB 15 CONNECTOR VIEWED FROM SIDE THE WIRES SOLDER TO
4. 3 AMP 10 16 VOLTS IN MICROPHONE PILOT MICROPHONE NC MICGROUND 4 MICROPHONE 5 COPILOT MICROPHONE NC PILOT HEADPHONES INTERCOM gt OOO z e CO PILOT HEADPHONES lt BACKLIGHTING CABIN SPEAKER gt 8 z 5 A 5 9 PILOTPTT 9 1 PILOT RELAY CUTS THE CO PILOT MIC AND CLOSES THE PTT LINE TO GROUND 2 CO PILOT RELAY CUTS OFF THE PILOT MIC AND CLOSES THE PTT LINE GROUND 3 NC NORMALLY CLOSED NO NORMALLY OPEN MICROAIR MA 760 TRANSCEIVER WIRING DIAGRAM PTT RELAYS FOR SINGLE MIC OPERATION Appendix Specifications Specifications Radio Type Channels Frequency Selection Frequency Display Frequency control Memories Power consumption Input Voltage Power output Receiver sensitivity Receiver Selectivity Squelch Threshold Speaker volume output Headset volume output Temperature range Stability Dimensions Exposed dial face Weight Amplitude Modulation AM Aircraft Transceiver 760 channels 25KHz spacing 118 000 136 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 25 programmable memories with scan function Receive no signal 86 mA Transmit 12 10
5. 7 16 Volts Warning damage will occur above 16 Volts 3 5 watts nominal 12dB for 1 0 uV 30 modulation KHz audio 70dB 0 5 0 9uV to 8 0 12 0uV Nominal 4 watts output to 4 ohms Nominal 100milli watts output to 600 ohms 30 60 degrees Celsius 3 00ppm W 65mm H 59mm D 135mm_ plus 35mm for harness W 2 6 H 2 3 D 5 3 plus 1 5 for harness 57mm diameter 2 diameter 400 grams 19 4 ounces Appendix C Drilling Template Drilling Template Limited Warranty Microair Avionics Pty Ltd warrants this product to be free from defects in materials and workmanship for 1 year or the minimum period defined by applicable consumer law whichever is the longer The warranty period is deemed to commence for the date of purchase Where the unit under warranty has been installed by an organisation which is approved to carry out avionics installation by the local Civil Aviation Authority and that organisation has completed signed and MICRO AIR returned the warranty card the warranty period shall commence from the date of installation 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 This warranty does not cover failures due to abuse misuse accid
6. If fitted at installation the remote memory button 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 If the user elects to operate in memory mode the remote memory button will step through the programmed memories If the Remote memory button is held down for 5 seconds the M760 will go into scan mode and automatically scroll through the programmed memories searching for a signal To terminate the scan operation the PTT is pressed briefly The remote memory button is highly recommended It allows the user to be able to keep hands on the controls during flight while changing channels or scanning Revision M Page 16 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Appendix A Wiring Diagrams Standard Wiring Includes remote memory intercom and backlighting switches along with cabin speaker PTT Operation Include a mode switch to allow the PTT button to be used for either transmit or intercom PTT Relay Operation Includes the use of two relays across both mic ines and the PTT line to allow only one microphone at a time to operate Revision M Page 17 4 October 2002 760 DB 15 CONNECTION MICROPHONE MIC GROUND MICROPHONE NOT WIRED INTERCOM NOT WIRED LED BACKLIGHTING 10 16 VOLTS IN 10 16 VOLTS IN GROUND GROUND REMOTE MEMORY HEADPH
7. Manual Frequency Adjust Knob The standby frequency can be changed by scrolling the frequency adjust knob Rotate knob to scroll the MHz half of the standby frequency Press the knob in briefly to move the cursor to the KHz half of the standby frequency Rotate the knob again to scroll the KHz After 5 seconds of inactivity the cursor will move back to the MHz side of the standby frequency Only the standby frequency can be changed directly the active frequency cannot be directly altered by the frequency adjust knob Cursor gt Toggle Switch The toggle switch is a push down switch When pushed down briefly the active and standby frequencies exchange places Hold the toggle key down for 3 seconds to activate the scan function 14 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Memory Programming The M760 has 25 programmable memories for storing commonly used frequencies Use the mode switch to move the display to the program mode The word PROG will appear on the top line with the memory number on the right hand side On the lower line is the currently stored frequency in that memory The cursor can be cycled through the MHz KHz and memory number by pressing the frequency adjust knob Move the cursor to the memory number and select the memory number for programming by rotating the frequency adjust knob Press the frequency adjust
8. RETURNING TO COUNTRY OF ORIGIN FOR WARRANTY SERVICE REPAIR AND WILL BE RE EXPORTED Address to either Microair Avionics Pty Ltd Microair Avionics Pty Ltd Box 5532 Airport Drive Bundaberg West Bundaberg West Queensland 4670 Queensland 4670 Australia Australia Microair may at it discretion refer product returns for repair or service to a service facility closest to you Microair Avionics Pty Ltd reserves the right to repair or replace the unit or software or offer a full refund of the purchase price at it s sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY Supplied by
9. knob to move to the MHz section Rotate the frequency adjust knob to scroll to the desired value Press the frequency adjust knob to move to the KHz section Rotate the frequency adjust knob to scroll to the desired value Cycle cursor between program number MHz and KHz by pressing the frequency adjust knob inwards briefly Rotate the frequency adjust knob to change value With the memory number and frequency set to the correct values press down the toggle switch briefly The word STORE appears briefly on the top line To clear a memory scroll to the desired memory and press down the priority switch briefly The word CLEAR appears on the top line The user can now move to another memory for programming Press the frequency adjust knob to move the cursor back to the memory number and scroll to next memory for programming When all programming is complete press the mode switch to move on from the program mode back to the active standby toggle display When operating in memory mode the programmed channels can be scrolled through by rotating the frequency adjust knob or by pressing the remote memory button Only programmed memories are displayed Operating the priority switch in either toggle or memory mode will move the M760 to memory 25 The user should consider carefully what frequency to program in memory 25 The factory default is the distress frequency 121 500MHz Revision M Page 15 4 October 2002 Microair Avionic
10. squelch 4 Receiver Transmit Annunciator Red Green LED 5 Mode Switch Momentary push down switch 6 Frequency Adjust Rotate for MHZ adjust Push briefly to change to KHZ Rotate for KHZ adjust 7 Toggle Switch Momentary push down switch 8 DB15 Connector Push in fit with lock nuts 9 M3 mounting stud for Switch module 10 BNC Coaxial Connector 11 LCD Display Two lines of eight characters each Revision M Page 5 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Installation Physical Installation The M760 is very simple to physically install in an aircraft s instrument panel Select or cut a 57mm 2 instrument hole for mounting 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 For installations where the existing instrument panel screw holes are 1 8 the hole will need to be enlarged to 5 32 to fit the M4 machine screws Insert and tighten all four M4 machine screws The M760 requires no rear support the M4 screws provide all of the physical mounting required 50 OHM COAX WIRING HARNESS BNC CONNECTOR 2002 NO REAR SUPPORT REQUIRED 2 A DB 15 CONNECTOR MIC GAIN TRIM 5 0 SIDETONE TRIM
11. 70 degrees 3 4 turn The heads of the trim pots are plastic and can be distorted or broken off unless adjusted with great care A small straight blade screwdriver with an insulated shaft is required Ensure the radio is turned off before punching the hole under the black dot and probing for the slot in the head of the trim pot Once the screwdriver is engaged on the trim pot the radio can be turned on and the adjustment made 00004600000 Sidetone 2 2 27 STRAIGHT BLADE SCREWDRIVER lt WITH INSULATED SHAFT 7 7 INCREASE DECREASE marar ANAT emam NOTATION Do not attempt to adjust the modulation or power output These adjustments can only be set correctly by a qualified technician Adjustment of the power output or modulation by anyone other than Microair or their approved agent will void the warranty Revision M Page 11 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Control Functions Priority Switch The priority switch is a push down switch When pushed down briefly the radio will go into memory mode and select the frequency stored in memory 25 Memory 25 should be considered the priority channel which the user can quickly select when required Memory 25 must be programmed for the priority switch to operate Memory 25 is set at the factory as the international distress frequency 121 500MHz Memory 25 can b
12. M4 MACHINE SCREWS 57MM 2 1 4 INSTRUMENT HOLE MICROAIR MA 760 PANEL INSTALLATION 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 Do NOT oversize the mounting holes in the front face of the radio 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 internal components and cause damage Either of these actions will void the warranty Revision M Page 6 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Electrical Installation Microair recommends the use of the wiring in the table below for the various parts of the radio harness Line Wire Power amp Ground Tefzel 18 awg wire Intercom Tefzel 22 awg wire PTT Tefzel 22 awg wire Memory Tefzel 22 awg wire Signal Ground Tefzel 22 awg wire Speaker Tefzel 22 awg single core shielded Microphone Tefzel 22 awg single core shielded Headphone Tefzel 22 awg single core shielded Aerial RG58C U 50 ohm Coaxial Cable All wiring is connected by soldering to the DB15 connector Strip the insulation back 2mm 1 16 and tin the exposed conductor with solder Slide a 5mm length of 3 2mm 1 16 heatshrink tubing over the end of the wire After che
13. Microair Avionics MICROAIR Microair Avionics Pty Ltd Airport Drive Bundaberg Queensland 4670 Australia 61741 553048 Fax 61741 553049 e mail sales microair com au Microair Avionics M760 Transceiver Installation amp User Manual About This Document illustrated This manual describes the various installation configurations available for the Microair M760 Transceiver Transceiver s controls and design features are described and The Microair reserves the right to amend this manual as required to reflect any enhancements or upgrades to the M760 R 0 Transceiver Microair Avionics Pty Ltd PRIORITY SQUELCH ON OFFNOL ACTIVE M R 760 R PUSH KHz UP DOWN MICROAIR M760 ACCESSORIES WIRING HARNESS 700 HEADSET MA 700 ANR HEADSET FLEXIBLE BOOM MICROPHONE DYNAMIC MICROPHONE PRE AMPLIFIER BOX SPEAKER CURRENT REVISION STATUS Revision Date Change K 31 01 2000 Initial release L 18 11 2001 Additional install data and wiring diagram added M 04 10 2002 Additional wiring diagram added Revision M Page 2 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Table of Contents 22 20
14. ONE SPEAKER 9 15 DB 15 CONNECTOR VIEWED FOR THE SIDE THE WIRES ARE SOLDERED TO OPTIONAL MUSIC AUDIO CONNECTION 3 AMP 10 16 VOLTS IN GROUND MUSIC GROUND MUSIC SIGNAL PILOT HEADPHONES MICROPHONE GROUND EEE i INTERCOM ON OFF SWITCH 9p BACKLIGHTING ON OFF SWITCH 1 CO PILOT PIT M ee NOTES 1 THE PTT AND REMOTE MEMORY BUTTON ARE TO BE MOMENTARY ON IN THEIR ACTION 2 THE SPEAKER CAN BE EITHER 4 OR 8 OHM BUT SHOULD BE MINIMUM 5 WATTS 3 THE MICROPHONES SHOULD BE GROUNDED PIN 2 ONLY THE MICROPHONE GROUND SHOULD NOT BE CONNECTED TO THE POWER GROUND POWER FUSING SHOULD BE MINIMUM 3 AMP AND NOT GREATER THAN 10 AMP DYNAMIC MICROPHONES WILL REQUIRE AN AMPLIFIER TO CORRECT OPERATION THE INTERCOM AND BACKLIGHTING SWITCHES ARE SPST ON OFF SWITCHES WARNING REVERSE POLARITY WILL INJURE THE M760 AND VOID THE WARRANTY 10 MUSIC AUDIO MAY BE WIRED IN PARALLEL WITH THE HEADPHONE AUDIO THE MUSIC SIGNAL LEVEL SHOULD BE TYPICALLY 100mW 600 OHMS MICROAIR M760 TRANSCEIVER WIRING DIAGRAM STANDARD INSTALLATION ANV AOA Lid WVaOVIC UAATHOSNVAL 09 6
15. ce the whip should be straight and vertical when mounted on the airframe Non Metal Skin Airframes For non metal airframes a 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 have a diameter of half the height of the whip The ground plane should be fabricated from a lightweight metal eg thin aluminium sheet or adhesive foil tape For best performance the ground plane should be flat and horizontal when mounted on the airframe An alternative antenna for non metal airframes is the Ground Plane independent dipole This antenna is physically similar to the wave whip but has a small stubbie antenna pointing downwards from the Revision M Page 8 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual antenna base The stubbie section of the antenna takes the place of the ground plane and simplifies installation Beware of fabric surfaces with silver dope finishes The silver dope is a conductive surface and with screen antennas which are mounted internally 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 If the backlighting is wired but not switched the backlighting will come on when the master switch is turned on The aircraft may be started w
16. cking the wiring diagram for the correct pin number push the tinned end into the terminal 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 Tinned wire Soldered with heatshrink Locking bolts tighened Cover the soldered joints with the grey plastic backshells Ensure that the locking bolts are in place before closing the backshells Connect to the rear of the radio with a push fit and secure the locking bolts top and bottom The M760 can be wired in several different configurations to suit the various needs The wiring diagrams located in Appendix A cover the most commonly used variations Microair recommends the use of its pre wired M760 harness The harness is available from Microair and comes complete with all switches sockets buttons and mounting hardware Separate lines have been wired for Pilot and Co pilot Headphone Microphone PTT Remote Memory Intercom ON OFF Revision M Page 7 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Coax Termination The coax is cut to length and terminated in a BNC connector Soldered or crimp type connectors are preferred to the solderless variety as they have lower signal loss and better shielding BNC Con
17. e programmed the same way as any of the other channels refer memory programming hence the factory default can be edited Volume Squelch Knob The M760 is turned by rotating the volume knob A positive click is heard and felt at the start of the rotation to indicate the 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 broken ie the static hiss 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 Clear off Radio is squelched above the threshold and is not receiving a signal Green Squelch is broken or a signal is received Red Radio is transmitting Flashing Red Radio has transmitted for over 40 seconds warning The flashing red signal may draw the user s attention to the fact that the aircraft may have a stuck PTT button Transmissions in excess of 30 seconds should be avoided Revision M Page 12 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Mode Switc
18. ent unauthorized alteration or repairs carried out by parties other than Microair or an approved Microair 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 Pty Ltd s 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 To obtain warranty service CALL the Microair Avionics Support line in Australia Phone 61 7 41 553048 Fax 61 7 41 553049 Email support microair com au Contact Microair Avionics for instruction on the return of product for service or repair Please ensure that you are able to supply the date of purchase product type reference serial number method of return and date of return All products returning to Microair Avionics should be marked clearly PRODUCT
19. es sesiccdsccestectdeoetesdscsdeestseseceddeceecssscesstestscedecstsesencduccesesscsssnessdessecstseseseseccseces LZ PriOrity Tohe 12 Volume Squelch Knob Ann nciator 12 MVA Era LERRA LKE AANA OE 13 CCE ETD 13 13 AEAEE 13 POPP 13 Frequency Adjust KNOB 14 SWAtCh i 14 Memory 5 LO 16 Appendix A Wiring Diagrams 17 Appendix 0 8 1 2
20. h The mode switch is a push down switch When pushed down briefly the radio will step to the next operating mode The M760 has four operating modes Toggle mode The display shows the active or in use frequency on the top line The standby frequency is displayed on the bottom line Memory Mode The top line displays the memory or MEM number and the lower line displays the frequency for that memory The displayed memory becomes the frequency the moment it is displayed The user can scroll through the programmed memories by rotating the frequency adjust knob or by pressing the remote memory button Program Mode The MEM is replaced with PROG on the top line The frequency stored in each memory can be set changed or cleared in this mode refer memory programming Scan Mode By holding down the toggle switch for 3 seconds the M760 goes into scan mode The programmed memories are cycled quickly across the display The M760 checks each memory in turn for any signal If there is no signal the radio moves to the next programmed memory When a signal is detected the scan locks to that memory to receive the signal This memory is held for 10 seconds after the signal finishes to afford the user an opportunity to reply on that memory channel The user can stop the scan operation by pressing down briefly the toggle key or the PTT button Revision M Page 13 4 October 2002 Microair Avionics M760 Transceiver Installation amp User
21. ics only come on when a pre set noise threshold is reached ie when you speak the mic comes It is therefore important to ensure that the sidetone and mic gain are set to the correct levels so that the mics do not pick up large amounts of ambient noise The sidetone and mic gain are pre set in the factory to levels which should suit most general aviation needs Microair recommends that mic muffs be fitted to all microphones as a principal way of reducing the pick up of ambient noise If after installing and trying the intercom there is too much background ambient noise re set the sidetone and the mic gain in the following way Sidetone 1 Connect headset s to the radio 2 Turn down headset volume to minimum 3 Close sidetone trim pot by turning fully counter clockwise 4 Speak into microphone with a constant tone and increase the sidetone by turning clockwise 5 Stop when good volume is heard Test this level with the headset volume to maximum Mic Gain 1 Connect headset s to the radio Start engine and listen to ambient noise If ambient noise is too high turn down mic gain with a SMALL counter clockwise turn When the noise is down to an acceptable level make a test transmission to another radio If the audio quality of the transmission is too weak the mic gain must be increased aS Please refer to the figure below to see how the trim pots are adjusted The trim pots have a total movement of only 2
22. ith the radio off but with the backlighting active without the possibility of injury to the radio The backlighting line from pin 8 may be taken to a dimmer The backlighting consists of 4 LED s behind the LCD display which operate on 0 14 volts The backlighting cannot be seen below 3 volts 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 Another small power saving can be made by closing the sidetone This is an option for operators using a cabin speaker only eg sailplanes The operator should remember that the minimum operating voltage is 10 7 volts This is the loaded voltage ie the voltage when the radio is transmitting For battery operators check the battery voltage level then press the PTT briefly to note the voltage drop If the loaded voltage dips close to 11 volts change the battery before flying Revision M Page 9 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Microphone 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 red
23. n and memory sections of this manual Warranty Card Please complete the warranty card and post it back to Microair The obvious benefit is to ensure your 12 month warranty is recognised refer to the limited liability warranty statement on the back cover of this manual Another benefit of returning the card is it allows Microair to send you service data directly should the need arise Microair monitors all feedback on its products Should the need arise to alert or advise customers of a potential problem good installation ideas or things to avoid Microair will despatch a service bulletin to the customer address list on file Release Note 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 Revision M Page 4 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Description The M760 VHF Transceiver has 57mm 2 4 round face to fit a standard small instrument hole The case is 59mm high x 65mm wide x 135mm long PRIORITY SQUELCH ON OFF VOL ACTIVE PUSH KHz UP DOWN ol Front Face Rear Face ITEM CONTROL DESCRIPTION 1 Machine Screw 2 Priority Switch Momentary push down switch 3 Volume Squelch Click On Rotate knob for volume Rotate ring for
24. nector Microair recommends using only soldered or crimped BNC connectors Solderless BNC connectors are NOT recommended as their performance is substandard with the M760 Antenna For certified aircraft the M760 should only be operated with a TSO DO 160D compliant antenna The antenna may wave whip or gt wave dipole using 50ohm coaxial cable and a BNC connector for connection For non certified aircraft using a non TSO compliant antenna the VSWR must be checked to ensure the ratio does NOT exceed 1 3 1 across 118 000 136 975Mhz range A VSWR of 1 5 1 can be tolerated by the M760 without injury to the transceiver but transmission performance starts to become impaired Do not use the stubbie rubber duckie antennas meant for use with handheld radios Where the cable length for the coaxial cable exceeds 15m 45 feet the RG 58C U cable should be replaced with RG 213 U cable At 15m the RG 58C U has approx 3dB loss 50 power where the RG 213 U has only 1 5dB 75 power For situations where maximum radio output power is essential use only RG 213 U Metal Skin Airframes For metal skin aircraft a wave whip 15 the easiest antenna to fit Ensure that the antenna base and the 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 performan
25. s M760 Transceiver Installation amp User Manual Operation The M760 should always be turned off before starting the aircraft to protect the radio from transient voltages After starting the radio can be turned on and the squelch adjusted so the static hiss can be heard through the headphones The LED annunciator will light green while the hiss is heard Use the hiss tone to adjust the volume to an appropriate level With the volume set turn the squelch ring to break the squelch and eliminate the hiss The LED annunciator light will go clear It may be necessary to readjust the squelch with the engine at full power as the ignition noise increases dramatically The intercom volume is pre set and not affected by the volume knob refer Intercom section on page10 The M760 can now be adjusted to the correct active and standby frequencies by scrolling and pressing the frequency adjust knob The M760 will transmit when the PTT button is held down The LED annunciator will light red When transmitting the user will hear themselves speaking through their own headphones via the sidetone system If the transmission lasts longer than 40 seconds either because you have a lot to say or because the PTT has stuck the LED annunciator will flash red When this happens check the PTT immediately If you find no obvious fault turn the radio off and then on again If the LED is still red turn the radio off and leave it off Remote Memory Button
26. uce background noise the M760 can be installed with relays across the mic lines and the PTT line to allow on one microphone at a time to operate refer appendix A This reduces background noise when transmitting For operators wanting to use a dynamic microphone a mic amplifier must be used Microair recommends the installation of the Microair MD 01a amplifier This amp is compatible with 300 600 ohm dynamic microphones using a small signal transformer LINES TO DYNAMIC MIC OR MIC JACK CONNECTOR END MIC SIGNAL LINE 7 9 VOLTS 27 gt 01 CONNECTOR RADIO END 778 2 CRIMP TERMINALS GROUND Speaker Microair recommends using a speaker of 4 ohms impedance rated at a minimum of 5 watts Microair recommends the SP01 Box Speaker The SPO1 has a durable thick film plastic cone of 4 ohms and is rated at 5 watts The 5 1 is fitted with a mounting bracket and is supplied with clips and screws Check your speaker choice by ensuring the audio is clear up to at full volume Revision M Page 10 4 October 2002 Microair Avionics M760 Transceiver Installation amp User Manual Intercom The M760 utilises the sidetone facility to produce a hot mic intercom This means the mics are live at all times to the pre set levels of the sidetone and the mic gain Both pilot and co pilot can speak and be heard at all times Hot mic operation is not a VOX system where the m
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