MicroAir Avionics M760 Manuale utente

Microair Avionics Pty Ltd

Airport Drive

Bundaberg

Queensland 4670

Australia

Tel: +61 7 41 553048

Fax: +61 7 41 553049

e-mail: [email protected].au

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 2 of 28 24th April, 2009

About This Document

This manual describes the various installation configurations

available for the Microair M760 Transceiver. The

Transceiver’s controls and design features are described and

illustrated.

Microair reserves the right to amend this manual as required,

to reflect any enhancements or upgrades to the M760

Transceiver.

Ensure that the M760 transceiver is switched off during

engine starting and stopping to avoid damage occurring.

CURRENT REVISION STATUS

Revision Date Change

K 31/01/00 Initial release

L 18/11/01 Additional install data and wiring diagram added

M 04/10/02 Additional wiring diagram added

N 08/12/03 Updated for revision N

P 01/10/06 Updated for revision P

01R3 13/10/06 Updated for proposed functionality of revision P

01R4 30/05/07 Proposed functionality for revision P amended

01R5 28/06/07 Updated for functionality as of M760_MICRO_1-3-3

01R6 3/06/08 Warranty Statement Upgrade

01R7 08/12/08 Updated for revision P2

01R8 25/2/09 Updated Limited Warranty Statement & deleted Warranty cards

01R9 24/4/09 repair@microair.com.au added to Warranty Statement

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 3 of 28 24th April, 2009

TABLE OF CONTENTS

1.0 INTRODUCTION.....................................................................................................................4

2.0 UNPACKING............................................................................................................................4

2.1 USER / INSTALL MANUAL ........................................................................................................................4

2.2 AUTHORISED RELEASE CERTIFICATE...................................................................................................4

3.0 DESCRIPTION.........................................................................................................................5

4.0 INSTALLATION......................................................................................................................6

4.1 ELECTRICAL INSTALLATION...................................................................................................................7

4.2 COAX TERMINATION.................................................................................................................................8

4.3 ANTENNA .....................................................................................................................................................8

4.3.1 METAL SKIN AIRFRAMES .................................................................................................................................................................... 8

4.3.2 NON-METAL SKIN AIRFRAMES .......................................................................................................................................................... 8

4.4 POWER...........................................................................................................................................................9

4.4.1 BACKLIGHTING ......................................................................................................................................................................................9

4.4.2 POWER SAVINGS.................................................................................................................................................................................... 9

4.4.3 POWER FILTER........................................................................................................................................................................................9

4.5 MICROPHONE ............................................................................................................................................10

4.5.1 ELECTRET...............................................................................................................................................................................................10

4.5.2 DYNAMIC ...............................................................................................................................................................................................10

4.6 SPEAKER.....................................................................................................................................................10

4.7 INTERNAL VOX INTERCOM....................................................................................................................11

4.8 HEADSET ADJUSTMENT..........................................................................................................................11

4.8.1 SIDETONE...............................................................................................................................................................................................11

4.8.2 MIC GAIN................................................................................................................................................................................................11

4.8.3 TRIMPOT ADJUSTMENT......................................................................................................................................................................11

4.9 EXTERNAL INTERCOM............................................................................................................................12

4.10 DUAL COMM INSTALLATION ................................................................................................................12

5.0 OPERATIONAL CONTROLS..............................................................................................13

5.1 PRIORITY SWITCH....................................................................................................................................14

5.2 VOLUME / SQUELCH KNOB....................................................................................................................14

5.3 ANNUNCIATOR LED.................................................................................................................................14

5.4 MODE SWITCH...........................................................................................................................................15

5.5 FREQUENCY ADJUST KNOB...................................................................................................................15

5.6 TOGGLE SWITCH.......................................................................................................................................16

5.7 REMOTE MEMORY BUTTON ..................................................................................................................16

5.8 PUSH TO TALK BUTTON..........................................................................................................................16

6.0 MODES....................................................................................................................................17

6.1 ACTIVE/STANDBY MODE........................................................................................................................17

6.1.1 108 TO 118 MHZ.....................................................................................................................................................................................17

6.1.2 MONITOR FUNCTION...........................................................................................................................................................................18

6.2 CHANNEL MODE.......................................................................................................................................19

6.3 VOX MODE .................................................................................................................................................19

7.0 PROGRAMMING & SETUP................................................................................................20

7.1 CD LOCKOUT.............................................................................................................................................20

7.2 VOX..............................................................................................................................................................21

7.3 MONITOR SETUP.......................................................................................................................................21

7.4 NEW MEMORY MODE..............................................................................................................................22

7.5 EDIT MEMORY MODE..............................................................................................................................22

7.6 EXIT MENU.................................................................................................................................................23

8.0 WIRING DIAGRAM..............................................................................................................24

9.0 SPECIFICATIONS M760 P2.................................................................................................25

10.0 DRILLING TEMPLATE.......................................................................................................26

11.0 LIMITED WARRANTY........................................................................................................27

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 4 of 28 24th April, 2009

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 ¼”) instrument hole. The M760 has been produced in accordance with CASA APMA

approval E2000-004.

2.0 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

2.1 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 operation and memory sections of this manual.

Please refer to the Microair Avionics Website www.microair.com.au for more installation information.

2.2 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.

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 5 of 28 24th April, 2009

3.0 DESCRIPTION

The M760 VHF Transceiver has a 57mm (2 ¼”) round face to fit a standard small instrument hole. The case is

59mm high x 65mm wide x 135mm long.

Front Face Rear Face

ITEM CONTROL DESCRIPTION

1 M4 x 12 Pan Phillips Mounting screw

2 Priority Switch Momentary push down switch

3 Volume / On / Squelch Click On - Rotate knob for volume

Rotate ring for squelch

4 Receiver / Transmit Annunciator Red / Green LED

5 Mode Switch Momentary push down switch

6 Frequency Adjust Knob Rotate to adjust value

Press to move cursor

7 Toggle Switch Momentary push down switch

8 DB15 Connector Push in fit with lock nuts

9 BNC Coaxial Connector

10 LCD Display Two lines of eight characters each

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 6 of 28 24th April, 2009

4.0 INSTALLATION

The M760 is very simple to physically install in an aircraft’s instrument panel. Select or cut a 57mm (2

¼”) 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.

M4 MACHINE SCREWS

57MM (2 1/4") INSTRUMENT HOLE

MIC GAIN TRIM POT

SIDETONE TRIM POT

NO REAR SUPPORT REQUIRED

MICROAIR MA-760

PANEL INSTALLATION

DB-15 CONNECTOR

WIRING HARNESS

50 OHM

COAX

BNC CONNECTOR

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

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 7 of 28 24th April, 2009

4.1 ELECTRICAL INSTALLATION

Microair recommends the use of the wiring in the table below for the various parts of the radio harness:

Line Wire

Power Tefzel 22 awg wire (2 lines)

Ground Tefzel 22 awg wire (2 lines)

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 checking 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 tightened

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).

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

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 8 of 28 24th April, 2009

4.2 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.

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.

4.3 ANTENNA

For certified aircraft the M760 should only be operated with a TSO compliant antenna. The antenna may

be ¼ wave whip or ½ wave dipole, using 50ohm coaxial cable and a BNC connector for connection. The

VSWR should ideally be less than 2:1 across the 118.000MHz to 136.975MHz airband.

For non-certified aircraft using a non-TSO compliant antenna, the VSWR must be checked to ensure the

ratio does NOT exceed 3:1 across the 118.000MHz to 136.975Mhz airband. The M760 will tolerate a

VSWR of 5:1 without injury to the transceiver, but the performance is severely deteriorated.

Do not use the stubbie “rubber duckie” antennas meant for use with handheld radios.

4.3.1 Metal Skin Airframes

For metal skin aircraft a ¼ wave whip is 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 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.

4.3.2 Non-Metal Skin Airframes

For non-metal airframes, a ¼ 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 ¼ wave whip, but has a small stubbie antenna pointing downwards from the

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.

Refer to the Microair Avionics website www.microair.com.au for more detail on antennas suitable for

non-metal skin airframes.

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 9 of 28 24th April, 2009

4.4 POWER

The M760 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 approx 1.6A when transmitting.

Low power will produce a BURRRRRRRRRR signal.

The maximum voltage for the M760 is 18V. NEVER operate the M760 on voltage exceeding 16V.

Damage will occur if the M760 is operated from power supplies

which exceed 16V, even for very short (transient) periods.

Operation on a supply which exceeds 16V will void the warranty.

The M760 has a diode and internal fuse to protect against reverse polarity. If reverse polarity is applied

the fuse (4A) will blow. Damage however may not be limited to the fuse.

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

4.4.1 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.

The power for the backlighting may be routed from a dimmer switch. The power must however be

ultimately sourced from the avionics master switch, to ensure that all components of the M760 are off

during start-up and shutdown of the engine.

4.4.2 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.

The operator should remember that the minimum operating voltage is 10 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 voltage dips by more than 0.2 volts, change the

battery before flying.

4.4.3 Power Filter

Microair recommends the installation of a power filter to supply power to the M760. A simple line filter

is sufficient to ensure that the voltage is smooth, and causes no interference to the radio. If an 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.

Microair Avionics M760 Transceiver Installation & User Manual

M760-P Install & User Manual 01R9.doc Page 10 of 28 24th April, 2009

4.5 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 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.

4.5.1 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.

4.5.2 Dynamic

Dynamic microphones are a low signal device. A dynamic microphone will not operate directly with an

M760 radio, because of the low signal produced.

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 150-600 ohm

dynamic microphones.

Refer to the Microair Avionics

website www.microair.com.au

for further details on

microphone types, and wiring

configurations.

4.6 SPEAKER

Microair recommends using a speaker of 4 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 the SP01 Box Speaker. The

SP01 has a durable thick film plastic cone of 4 ohms,

and is rated at 5 watts. The SP01 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.

MD-01a

CONNECTOR (RADIO END)

CONNECTOR (MIC END)

CRIMP TERMINALS

MIC SIGNAL LINE

(7-9 VOLTS)

GROUND

LINES TO DYNAMIC MIC

OR MIC JACK

Altri manuali per M760

Indice

Altri manuali MicroAir Avionics Ricetrasmettitore

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