trig TMA44 Manual de usuario
TMA44 Audio Panel
Installation Manual
01849-00-AB
7 November 2017
Trig Avionics Limited
Heriot Watt Research Park
Riccarton, Edinburgh
EH14 4AP
Scotland, UK
Copyright Trig Avionics Limited, 2017
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TMA44 Audio Panel Installation Manual 7 November 2017
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CONTENTS
1.PREFACE...............................................................................................1
1.1PURPOSE ...........................................................................................1
1.2SCOPE ...............................................................................................1
1.3CHANGES FROM PREVIOUS ISSUE......................................................1
1.4DOCUMENT CROSS-REFERENCES......................................................1
2.INTRODUCTION .................................................................................2
2.1EQUIPMENT DESCRIPTION.................................................................2
2.2TSO HOLDER....................................................................................2
3.TECHNICAL SPECIFICATIONS ......................................................3
3.1PHYSICAL SPECIFICATIONS ...............................................................5
3.2APPROVAL BASIS ..............................................................................5
3.3LICENSE REQUIREMENTS ..................................................................5
4.UNIT AND ACCESSORIES SUPPLIED............................................6
4.1EQUIPMENT SUPPLIED.......................................................................6
4.2INSTALLATION KIT ...........................................................................6
4.3REQUIRED ITEMS ..............................................................................7
5.INSTALLATION...................................................................................8
5.1UNPACKING AND PRELIMINARY INSPECTION ....................................8
5.2EQUIPMENT INSTALLATION PROCEDURES.........................................8
5.2.1Cooling Requirements..............................................................8
5.2.2Mounting Requirements...........................................................9
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5.2.3Mounting Rack Installation......................................................9
5.2.4Audio Panel Tray and Connector Assembly ............................9
5.3CABLE HARNESS WIRING ...............................................................10
5.3.1Noise ......................................................................................10
5.3.2Entertainment Input (J1 pin 9 & 25)......................................11
5.3.3TMA44 Pin assignments ........................................................13
5.3.4External Push-to-Talk (J1 pin 32 pilot, J1 pin 31 co-pilot)...14
5.3.5Transmit Interlock..................................................................14
5.3.6Power (J1 pin 43)...................................................................14
5.3.7"Swap" Mode (J1 pin 11).......................................................15
5.3.8Backlighting (J1 pin 41).........................................................15
5.3.9Backlight Voltage Adjustment................................................15
5.3.10Middle Marker Sense (J1 pin 27 & 28)..................................17
5.3.11Unswitched Inputs (J1 pin 7, 22 & 24)..................................17
5.3.12Intercom.................................................................................17
5.4ADJUSTMENTS ................................................................................18
5.5MARKER ANTENNA INSTALLATION ................................................19
5.6COMMUNICATIONS ANTENNA INSTALLATION NOTES .....................19
5.7UNIT INSTALLATION .......................................................................19
6.POST INSTALLATION CHECKOUT.............................................20
6.1REQUIRED TEST EQUIPMENT ..........................................................20
6.2POWER TEST ...................................................................................20
6.3MARKER CHECKOUT.......................................................................21
7.FINAL INSPECTION.........................................................................22
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8.NORMAL OPERATION....................................................................23
8.1FRONT PANEL .................................................................................23
8.2POWER ON AND FAIL-SAFE OPERATION .........................................23
8.3TRANSMITTER SELECTION ..............................................................23
8.4RECEIVER SELECTION .....................................................................24
8.5NAVIGATION AUDIO SELECTION.....................................................24
8.6COCKPIT SPEAKER ..........................................................................24
8.7SWAP MODE ...................................................................................24
8.8SPLIT MODE....................................................................................25
8.9INTERCOM VOLUME........................................................................25
8.10INTERCOM SQUELCH.......................................................................25
8.11INTERCOM MODES ..........................................................................26
8.12INTERCOM MODE TABLE ................................................................27
8.13MUSIC INPUTS ................................................................................27
8.14MUSIC MUTING ..............................................................................27
8.15MARKER BEACON RECEIVER ..........................................................28
9.CONTINUED AIRWORTHINESS ...................................................29
9.1CLEANING THE FRONT PANEL.........................................................29
10.LIMITED WARRANTY.................................................................30
11.ENVIRONMENTAL QUALIFICATION FORM........................31
APPENDIX AEXTERNAL PTT HOOK UP.....................................33
PUSH TO TALK MODIFICATIONS .................................................................33
Procedures for David Clark PTT...........................................................34
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Procedures for Telex PT-200.................................................................34
Procedures for Telex PT-300.................................................................34
APPENDIX BINSTALLATION DRAWINGS..................................35
APPENDIX CWIRING/INTERCONNECT......................................37
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1. Preface
1.1 Purpose
This manual describes the physical and electrical characteristics and the
installation requirements for a TMA44 Audio Panel.
1.2 Scope
This manual applies to the installation of the TMA44 Audio Panel.
1.3 Changes from Previous Issue
No text changes – reformatted for A5.
1.4 Document Cross-References
01848-00 TMA44 Audio Panel Operating Manual
TSO C35d Airborne Radio Marker Receiving Equipment FAA
ETSO 2C35d Radio Marker Receiving Equipment EASA
TSO C50c Audio Selector Panels and Amplifiers FAA
ETSO C50c Audio Selector Panels and Amplifiers EASA
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2. Introduction
2.1 Equipment Description
The TMA44 is a state of the art audio isolation amplifier and audio selector
that contains a voice activated (VOX) intercom system. It can switch up two
transceivers (Com 1, Com 2) and six receivers (Nav 1, Nav 2, ADF, DME,
MKR and AUX). In addition, there are two unswitched inputs, for priority
audio sources such as TAWS or altimeter warning. Push buttons select the
receiver audio sources provided to the headphones. A speaker button allows
the user to listen to the receiver(s) selected on the cabin speaker. Except for
the unswitched inputs, all speaker audio is muted during transmit. Push
buttons select one of the transceivers for the pilot and co-pilot position in
transmit. In "Split Mode" the TMA44 allows the pilot and co-pilot to operate
different transmitters independently.
A fail-safe mode connects the pilot headphone and microphone to Com 1 and
unswitched input 1 if power is removed for any reason, or if the audio panel is
turned off by pushing the volume control.
A four-station voice activated (VOX) intercom is included in the TMA44.
Pilot isolate and crew modes, two mono music inputs with "Soft Mute" and
transmit indications. Intercom control is through front panel mounted knobs.
Dual concentric knobs control intercom volume and intercom squelch.
A 3-light Marker Beacon receiver is integral to the TMA44. This provides the
necessary Marker Beacon light and audio indications necessary for an
Instrument Landing System (ILS) approach.
2.2 TSO Holder
The TSO holder and manufacturer of the TMA44 is PS Engineering, Lenoir
City, TN, USA.
US patents no. 5,903,227 and 6,160,496 apply.
SoftMute is a trademark of PS Engineering.
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3. Technical Specifications
Specification Characteristics
Compliance Marker Beacon: TSO C35d, Class A, ETSO
2C35d
Audio Selector/Intercom: TSO C50d, Class A,
ETSO C50c
Applicable documents RTCA DO-160B, RTCA DO-170 and RTCA
DO-143
Power Requirements Voltage: 14 or 28 VDC*
Maximum current 1 amp (externally protected
by a 2 amp circuit breaker). Typical operating
current 350 mA (speaker off), 600 mA
(speaker on).
*28 VDC requires 15W dropping resistor
(included)
Altitude Up to 50,000 feet in a non-pressurised area of
the cockpit
Operating Temperature -20°C to +55°C
Storage Temperature -40°C to +85°C
Input impedance 510
Input Isolation -70 dB (min.)
Speaker Muting -60 dB (min.)
Speaker Output (into 4 ) 3 watts (min.) with no clipping
Switched Receiver Inputs 8 (Com 1, Com 2, Nav 1, Nav 2, ADF, DME,
MKR, AUX)
Unswitched Inputs 2
Transmitter Selections 3; Com 1, Com 2, Com 1/2
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Speaker Impedance 4
Headphone Impedance 150 - 1000
Headphone Output 45 mW each headset with no clipping
Microphone Impedance 150 - 600
Intercom Positions 4 places (monaural)
Music Inputs 2
Music Muting
Distortion
>50 dB "Soft Mute" when Radio or intercom
active
<1% THD@ 45 mW into 150
Mic Freq. Response, ±3 dB 350 Hz - 6000 Hz
Music Freq. Response, ±3 dB 200 Hz - 15 kHz
Marker Beacon Receiver
Frequency
75 MHz Crystal Controlled
Marker Beacon Receiver
Sensitivity
Low: 450 µV (Hard) Factory adjusted to
1400µV (Soft)
High: 160 µV (Hard) Factory adjusted to
150µV (Soft)
Marker Beacon Receiver
Selectivity
-6 dB at 110 kHz, -40 dB at 120 kHz
External Lamp Output 7.0 (+/- 4) VDC positive when active, max.
current 125 mA
MM Sense Active high (4.7 VDC +/- 0.5V) during
Middle Marker acquisition, for autopilot use
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