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9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PMA450
Document P/N 200-450-0000
Revision 3, November 2014
Audio Selector Panel with Marker Beacon Receiver High-fidelity Stereo Intercom, USB Charging Port
System Installation and Operation Manual
FAATSO C139a, C35d, C71 Patented under one or more of the following;
No. 4,941,187; 5,903,227; 6,160,496 and 6,493,450, 7,391,877
In certified aircraft, warranty is not valid unless this product is installed by an Authorized PS Engineering dealer.
PS Engineering, Inc. 2014 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone (865) 988-9800, email contact@ps-engineering.com.
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Table of Contents |
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Section I – GENERAL INFORMATION |
............................... 1-1 |
1.1 |
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INTRODUCTION............................................................................................................................ |
1-1 |
1.2 |
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SCOPE .............................................................................................................................................. |
1-1 |
1.3 |
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EQUIPMENT DESCRIPTION....................................................................................................... |
1-1 |
1.4 |
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APPROVAL BASIS ......................................................................................................................... |
1-2 |
1.1.1 |
LIMITATIONS..................................................................................................................... |
1-2 |
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1.5 |
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SPECIFICATIONS.......................................................................................................................... |
1-2 |
1.6 |
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EQUIPMENT SUPPLIED............................................................................................................... |
1-3 |
1.7 |
EQUIPMENT REQUIRED BUT NOT SUPPLIED ...................................................................... |
1-4 |
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1.8 |
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LICENSE REQUIREMENTS......................................................................................................... |
1-4 |
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Section II - INSTALLATION ........................................ |
2-1 |
2.1 |
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GENERAL INFORMATION.......................................................................................................... |
2-1 |
2.1.1 |
SCOPE.............................................................................................................................. |
2-1 |
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2.1.2 |
CERTIFICATION REQUIREMENTS ...................................................................................... |
2-1 |
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2.2 |
UNPACKING AND PRELIMINARY INSPECTION .................................................................................. |
2-1 |
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2.3 |
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EQUIPMENT INSTALLATION PROCEDURES....................................................................................... |
2-1 |
2.3.1 |
COOLING REQUIREMENTS ................................................................................................ |
2-1 |
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2.3.2 |
MOUNTING REQUIREMENTS ............................................................................................. |
2-1 |
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2.3.3 AUDIO PANEL MOUNTING RACK INSTALLATION ............................................................. |
2-2 |
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2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY ......................................................... |
2-2 |
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2.4 |
CABLE HARNESS WIRING ................................................................................................................. |
2-2 |
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2.4.1 |
ELECTRICAL NOISE........................................................................................................... |
2-2 |
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2.4.2 EXISTING GMA340 AND PMA8000 INSTALLATIONS ...................................................... |
2-3 |
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2.4.3 |
POWER .............................................................................................................................. |
2-4 |
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2.4.4 |
COMMUNICATIONS PUSH-TO-TALK.................................................................................. |
2-4 |
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2.4.5 |
AUDIO PANEL INTERFACE ................................................................................................ |
2-4 |
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2.4.6 |
TRANSMIT INTERLOCK ..................................................................................................... |
2-4 |
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2.4.7 |
BACKLIGHTING ................................................................................................................. |
2-4 |
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2.4.8 |
UNSWITCHED INPUTS........................................................................................................ |
2-5 |
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2.4.9 "SWAP" MODE .................................................................................................................. |
2-5 |
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2.4.10 PUBLIC ADDRESS MODE................................................................................................. |
2-6 |
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2.4.11 MISCELLANEOUS LOGIC OUTPUT (J2, PIN 18) ............................................................... |
2-6 |
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2.4.12 AUDIO ACTIVE OUTPUT (J1, PIN 24) .............................................................................. |
2-6 |
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2.5 |
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INTERCOM WIRING ............................................................................................................................ |
2-6 |
2.5.1 |
MUSIC INPUTS................................................................................................................... |
2-6 |
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2.5.2 |
PLAYBACK BUTTON INSTALLATION ................................................................................. |
2-7 |
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2.6 |
MARKER BEACON INSTALLATION .................................................................................................... |
2-7 |
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2.6.1 MARKER ANTENNA INSTALLATION ................................................................................. |
2-7 |
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2.6.2 MARKER BEACON HIGH SENSE SELECT (J2, PIN 30) ........................................................ |
2-7 |
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2.6.3 |
EXTERNAL MARKER LIGHTS ............................................................................................ |
2-7 |
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2.6.4 MIDDLE MARKER SENSE .................................................................................................. |
2-7 |
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2.7 |
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USER ADJUSTMENTS ......................................................................................................................... |
2-8 |
2.7.1 |
ADJUST SCREEN................................................................................................................ |
2-8 |
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2.7.2 |
RENAME “SWITCHED” INPUTS.......................................................................................... |
2-8 |
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2.7.3 |
BLUETOOTH® MENU ........................................................................................................ |
2-9 |
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2.8 |
COMMUNICATIONS ANTENNA INSTALLATION NOTES ..................................................................... |
2-9 |
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2.9 |
PMA450 PIN ASSIGNMENTS............................................................................................................ |
2-10 |
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2.10 |
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WIRING CHECKOUT ...................................................................................................................... |
2-11 |
2.11 |
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UNIT INSTALLATION...................................................................................................................... |
2-11 |
2.12 |
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OPERATIONAL CHECKOUT ........................................................................................................... |
2-11 |
2.12.1 |
REQUIRED TEST EQUIPMENT ........................................................................................ |
2-11 |
2.12.2 |
AUDIO PANEL TEST ...................................................................................................... |
2-11 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.12.3 MARKER CHECKOUT (050-450-0100, ONLY) ............................................................... |
2-12 |
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2.12.4 |
BLUETOOTH CHECKOUT ............................................................................................... |
2-12 |
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2.12.5 |
INTERNAL RECORDER CHECKOUT................................................................................ |
2-12 |
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2.13 |
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FINAL INSPECTION ........................................................................................................................ |
2-12 |
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Section III OPERATION............................................ |
3-1 |
3.1 |
SCOPE .............................................................................................................................................. |
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3-1 |
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3.2 |
POWER AND FAIL SAFE (1)................................................................................................................ |
3-1 |
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3.3 |
MENU SELECTION (6)........................................................................................................................ |
3-2 |
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3.4 |
COMMUNICATIONS TRANSMIT (XMT) SELECTION (2).................................................................... |
3-2 |
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3.4.1 |
SPLIT MODE...................................................................................................................... |
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3-2 |
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3.5 |
COM AUDIO SELECTOR (3).............................................................................................................. |
3-2 |
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3.5.1 SWAP MODE (SWITCH FROM COM 1 TO COM 2 REMOTELY) ............................................ |
3-3 |
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3.5.2 |
INTELLIAUDIO® DIMENSIONAL AUDIO ........................................................................... |
3-3 |
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3.5.3 COM MONITOR MODE ...................................................................................................... |
3-3 |
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3.5.4 NAVAID SELECTION (4) .................................................................................................... |
3-3 |
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3.6 |
SPEAKER AMPLIFIER (7) ................................................................................................................... |
3-4 |
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3.6.1 |
PUBLIC ADDRESS FUNCTION ............................................................................................ |
3-4 |
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3.7 |
MARKER BEACON OPERATION (9) (UNIT PART NUMBER 050-450-0100, ONLY) ............................. |
3-5 |
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3.8 |
INTERCOM OPERATION (8) ............................................................................................................... |
3-6 |
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3.8.1 |
INTELLIVOX® |
INTERCOM VOX-SQUELCH ........................................................................ |
3-6 |
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3.8.2 INTERCOM VOLUME CONTROL (1) ................................................................................... |
3-6 |
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3.8.3 |
INTERCOM MODES (8) ...................................................................................................... |
3-7 |
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3.9 |
MUSIC AND MUSIC MUTING ............................................................................................................. |
3-8 |
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3.9.1 |
MUSIC MUTING ................................................................................................................ |
3-9 |
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3.9.2 |
MUSIC VOLUME................................................................................................................ |
3-9 |
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3.9.3 MUSIC IN PILOT ISO MODE............................................................................................... |
3-9 |
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3.10 |
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BLUETOOTH® |
CONNECTION ......................................................................................................... |
3-10 |
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3.10.1 PAIRING AND UNPAIRING BLUETOOTH DEVICES .......................................................... |
3-10 |
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3.11 |
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BLUETOOTH® TELEPHONE MODE ............................................................................................... |
3-10 |
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3.11.1 |
CELLULAR TELEPHONE SIDETONE ................................................................................ |
3-11 |
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3.12 INTERNAL RECORDER AND PLAYBACK......................................................................................... |
3-11 |
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3.13 USER SETUP MENUS....................................................................................................................... |
3-12 |
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3.14 |
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LCD ADJUSTMENT ........................................................................................................................ |
3-12 |
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3.14.1 |
DISPLAY TIMEOUT........................................................................................................ |
3-12 |
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3.14.2 |
RENAME “SWITCHED” INPUTS...................................................................................... |
3-13 |
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3.14.3 |
BLUETOOTH SETUP....................................................................................................... |
3-13 |
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3.15 USB CHARGING PORT (10) ........................................................................................................... |
3-13 |
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Section IV – Warranty and Service.................................... |
4-1 |
4.1 |
WARRANTY........................................................................................................................................ |
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4-1 |
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4.2 |
FACTORY SERVICE ............................................................................................................................ |
4-1 |
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Appendix A – PMA450 Installation Drawings......................................................... |
A |
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Appendix B – J1 Connector Interconnect .................................................................. |
B |
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Appendix C – J2 Connector Interconnect ................................................................. |
C |
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Appendix D – Instructions for FAA Form 337 and continuing airworthiness ...... |
D |
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8.1 |
INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS ......................................................................... |
D |
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8.2 |
INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO SYSTEM ................................................ |
D |
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Appendix E – RTCA DO160G Environmental Qualification Form............................. |
E |
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Rev |
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Date |
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Change |
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0 |
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5/25/2014 |
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New Release of manual |
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1 |
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July 2014 |
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Revise after TSOA |
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2September 2014 Update with no marker version information
3November 2014 Change Marker High sense operation (S/N E01151 and above)
200-450-0000 |
Page ii |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section I – GENERAL INFORMATION
1.1INTRODUCTION
The PMA450 represents a revolutionary step in cockpit audio control and intercommunications utility. IntelliAudio®, using the USAF patented technology, provides True Dimensional Sound, helping pilots to more easily discern from simultaneous radio receptions. Our patented IntelliVox® design, front panel USB power jack, and pilot programmable configurations, marks this panel as the next level of audio control. The unit is designed for outstanding ergonomics and visually defined mode annunciation and selection.
Before installing and/or using this product, please read this manual completely. This will ensure that you will take full advantage of all the advanced features in the PMA450.
1.2SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA450series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model |
Description |
Part Number |
PMA450 |
Digital Stereo Audio Selector Panel with Marker Beacon, |
050-450-0100 |
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USB Charging port |
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PMA450 |
Digital Stereo Audio Selector Panel with USB Charging |
050-450-0200 |
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port without Marker Beacon |
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1.3EQUIPMENT DESCRIPTION
The PMA450 is a state-of-the-art audio isolation amplifier and audio selector that contains an automatic voice activated (VOX) intercom system and integral marker beacon receiver. It can switch two transceivers (Com 1, Com 2) and six receivers (Nav 1, Nav 2, MKR, and three additional inputs which can be individually labeled, for use with ADF, DME, AUX, etc.).
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by FCC regulation. PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PMA450 must be interfaced with an approved system.
There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar altimeter warning.
Pushbuttons select the receiver audio source provided to the headphones. A SPR 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. Unswitched inputs 1& 2 are always presented to the aircraft speaker. Unswitched input 3 & 4 will be presented to the speaker when the front panel SPR push button has been selected.
Pushbutton switches select one of the communication transceivers for the pilot and copilot position, and allows radio transmission. In "Split Mode" the PMA450 has the ability to allow the pilot to transmit on Com 1 while the copilot can transmit on Com 2. A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any reason, or if the power switch is placed in the Off (Fail-safe) position. Unswitched input #1 is also provided to the pilot headphone (left side headset ear cup) in fail-safe
A six-station voice activated (VOX) intercom is included in the PMA450. This system has PS Engineer-
ing’s patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incorporates pilot isolate, all and crew modes, two independent stereo music inputs with "SoftMute™". Intercom vol-
ume control is through two concentric front panel knobs and a pushbutton intercom mode switch. The small volume knob controls the intercom level for the pilot and copilot, while the large knob controls the passenger intercom volume. Intercom squelch is automatic.
A, 75 MHz Marker Beacon receiver and 3-light indicator is integrated in the PMA450 (050-450-0100 only). This provides the necessary Marker Beacon lights and audio indications necessary for that portion of an
200-450-0000 |
Page 1-1 |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Instrument Landing System (ILS) approach. A pushbutton labeled MKR allows the pilot select audio on as well as test and mute modes. Marker high sensatvoty is also controlled by this button (see § S/N and above). Below S/N E01151 high sense is switched externally (see §2.6.2 for details.
The front panel USB-type connector is available for charging devices, such as iPad or cell phones. Up to 10 Watts are available. This connector does NOT provide any data interface.
In the PMA450, a Bluetooth® wireless interface is available for wireless te lephone and music connection.
1.4APPROVAL BASIS
FAA TSO Approval
The PMA450-series Audio Selector Panels are FAA approved under TSO C139A (Audio Amplifiers) TSO C35d (Marker Beacon Receivers) and C71 (DC Power Supplies)
All systems comply with relevant portions of EUROCAE RTCA MPS WG No. 7/70, DO-143 and (Marker Beacon Receivers), ED-14C/DO-160G (Environmental Conditions and Test Procedures for Airborne Equipment), ED12B/DO-178B, Level D (Software Considerations for Airborne Equipment) and ED- 18/DO-214A (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio Systems).
1.1.1Limitations
This article meets the minimum performance and quality control standards required by a technical standard order (TSO). Installation of this article requires separate approval.
Refer to Advisory Circular 20-41A for information on TSO installation approval.
Operation is subject to the following conditions: This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
1.5 SPECIFICATIONS
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TSO COMPLIANCE |
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Marker Beacon: |
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FAA TSO C35d, Class A |
Audio Selector/Intercom: |
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FAA TSO C139a, Class 1a |
DC Charging Jack |
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FAA TSO C71 |
APPLICABLE DOCUMENTS: |
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RTCA/DO-214A RTCA/DO-143 RTCA/DO- |
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160G |
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RTCA/DO-178C, DO-254 |
ENVIRONMENTAL Qualifications:
Operating Temperature Range:
Altitude:
DIMENSIONS:
WEIGHT
PMA450 Unit
Rack with connectors
A1D1CABSMXXXXXXZBABATBXXE2XXX
-15º C to 55ºC
Up to 35,000 feet in an non-pressurized area
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm) Depth behind panel 7.15 in. (18.16 cm)
1.34 lb. (0.61 kg)
0.51 lb. (0.24 kg)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
Maximum Current:
11 to 33 VDC
3.5 Amp (Externally protected by a 5A pull-type breaker)
200-450-0000 |
Page 1-2 |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Audio Selector Specifications
Audio selector panel input impedance: |
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510 |
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Input Isolation: |
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-60 dB (min.) |
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Speaker Muting: |
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-60 dB (min.) |
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Speaker Output (into 4 ) with no clipping |
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3 Watts (min.) |
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14 VDC: |
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28 VDC: |
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10 Watts (min.) |
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Receiver Inputs: |
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7 (Com 1, Com 2, Nav 1, Nav 2, 3 ea. Switched Inputs |
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available) |
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Unswitched Inputs: |
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4 |
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Transmitter Selections: |
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3 (Com 1, Com 2, Com1/2) |
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Speaker Impedance: |
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4 |
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Headphone Impedance: |
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150 – 1000 |
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Headphone Output: |
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30 mW each headset, no clipping <.5% THD typical |
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Microphone Impedance: |
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150 - 600 |
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Bluetooth Radio (PMA450 -1702 only) |
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Class 3, FCC ID QOQWT32AE |
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Intercom Specifications |
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Intercom Positions: |
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6 places (with individual IntelliVox® circuits) |
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Music Inputs: |
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2, (Independent, Stereo) |
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Music Muting: |
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>-30 dB "Soft Mute" when Com or intercom active. |
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Distortion: |
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<1% THD @ 30 mW into 150 |
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Mic Freq. Response, 3 dB: |
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300 Hz - 6000 Hz |
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Music Freq. Response, 3 dB: |
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10 Hz – 26 kHz |
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MARKER BEACON RECEIVER (-0100 only) |
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Frequency: |
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75 MHz Crystal Controlled |
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Sensitivity: |
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Capable of: (preset at factory for field application) |
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Low: |
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1000 Volts (Hard) (360 to 570 V soft) |
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High: |
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200 Volts (Hard) (130 to 200 V soft) |
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Selectivity:
External Lamp Output:
MM Sense:
-6 dB at ±10 kHz -40 dB at ±120 kHz
7.5 (±4 VDC unloaded, at maximum brightness) VDC positive when active, max. current 125 mA
Active high (4.5 ± 1.0VDC)
USB Charging Port
Available Current
Voltage
10 Watts Maximum output, short circuit and over-current protected
5 VDC
1.6EQUIPMENT SUPPLIED
1 ea. of the following units:
Model |
Description |
Part Number |
PMA450 |
PMA450 Digital Audio Panel with Marker, Stereo Intercom, USB |
050-450-0100 |
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Charging jack, and Bluetooth connectivity |
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PMA450 |
Same as above, without Marker Beacon capability |
050-450-0200 |
200-450-0000 |
Page 1-3 |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PMA450 Installation Kit: 250-890-0000 |
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Description |
Quantity |
Part |
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Number |
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Installation rack assembly |
1 |
430-890-0040 |
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Rack back plate |
1 |
430-890-0050 |
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44-pin connector kit |
2 |
120-891-2045- |
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Backshell, connector |
2 |
625-025-2465 |
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Backshell Retainer |
2 |
431-881-0100 |
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4 40 X 7/16 screw w/nylon patch |
4 |
475-440-0007 |
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4 40 X 3/8 screw w/nylon patch |
4 |
475-440-1038 |
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4-40 x ¼” screw with lock washer |
2 |
475-440-0001 |
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Solder Lug |
2 |
475-009-0001 |
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Cable Clamp |
1 |
625-001-0002 |
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#6-32 x ½” Flat head Philips screw |
6 |
475-632-0012 |
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#6-32 Clip Nut |
6 |
475-630-0002 |
1.7EQUIPMENT REQUIRED BUT NOT SUPPLIED
a.Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA450
b.Isn’t this optional? You’re not required to have speaker are you? Speaker, 4
c.Headphone Jacks (Stereo, as Required)
d.Microphone Jacks (as Required)
e.Headphones, 150 (Stereo), up to 6 as required
f.Microphones, up to 6 as required
g.Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed) (-0100 Only)
h.Interconnect Wiring
1.8LICENSE REQUIREMENTS
None
PMA450 Bluetooth™ Radio approval:
FCC ID: QOQWT32AE
Industry Canada ID: 5123A-BGTWT32AE
CE EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC
200-450-0000 |
Page 1-4 |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section II - INSTALLATION
2.1GENERAL INFORMATION
2.1.1SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering PMA450 Audio Selector Panel/Intercom/ with internal Marker Beacon.
Please read this manual carefully before beginning any installation to prevent damage and post-installation problems.
Installation of this equipment requires special tools, test equipment (refer to §2.12.1) and installer knowledge as required by 14 CFR 65.81 (b).
2.1.2Certification Requirements
NOTE
The PMA450 requires specialized knowledge and tools for an effective installation. An appropriately rated Certified Aircraft Repair Station must install this equipment in accordance with applicable regulations. PS Engineering, Incorporated warranty is not valid unless the equipment is installed by an authorized PS Engineering, Incorporated dealer.
Failure to follow any of the installation instructions, or installation by a non-certified individual or agency will void the warranty, and may result in an unairworthy installation.
This article meets the minimum performance and quality control standards required by a technical standard order (TSO). Installation of this article requires separate approval. Refer to AC 20-41A for information regarding Substitute TSO Aircraft Equipment.
2.2Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible signs of shipping damage. Examine the unit for loose or broken buttons, bent knobs, etc. Verify the correct quantity of components supplied with the list in §1.6. If any claim is to be made, save the shipping material and contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accessories show any sign of external shipping damage, contact PS Engineering to arrange for a replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned to PS Engineering for any other reason should be shipped in the original PS Engineering packaging, or other UPS approved packaging.
2.3Equipment Installation Procedures
2.3.1Cooling Requirements
Forced air-cooling of the PMA450 is not required. However, the units should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate cooling air provided.
2.3.2Mounting Requirements
The PMA450 must be rigidly mounted to the instrument panel of the aircraft structure, within view and reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2B, or other FAA-approved aircraft technical data. The unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.
To prevent noise, avoid installing the unit close to high current devices or systems with high-voltage pulse type outputs, such as DME or transponders. Avoid running the interconnecting bundles near any high current wires.
200-450-0000 |
Page 2-1 |
Rev. 3, November 2014 |
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.3.3Audio Panel Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is in the center of the unit. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit free of the tray. Set the unit aside in a safe location until needed. Install the tray using six clip nuts (475-630-0002), and six FHP 6-32 x ½" screws (475 -632-0012). The audio selector panel must be supported at front and rear of the mounting tray.
2.3.4Audio Panel Tray and Connector Assembly
The rack connectors mate with two 44-pin connectors in the PMA450. The connectors are a sub-miniature crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The connectors are mounted to the tray back plate with #4-40 screws (475-440-1038), from the inside of the tray and the mounting block, 431-891-0100. Ensure that proper strain relief and chafing precautions are made during wiring and installation, using the cable clamp (625-001-0002).
Two grounding lugs are provided, which may be attached to the rear mounting plate with 2 ea #4-40 x ¼” screws with captivated lock washers. These provide a convenient location to connect the shield ground terminations.
Manufacturer |
Crimping Tool |
Positioner |
Extraction tool |
AMP |
601966-1 |
601966-6 |
91067-1 |
Daniels |
AFM8 |
K42 |
M24308-1 |
ITT-Cannon |
995-0001-584 |
995-0001-739 |
91067-1 |
Table 2-1 Connector Pin crimping tools
2.4Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires must be MIL-SPEC in accordance with current regulations. Twoand three-conductor shielded wire must be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2B for more information. Failure to use correct techniques may result in improper operation, electrical noise or unit failure. Damage caused by improper installation will void the PS Engineering warranty.
2.4.1Electrical Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft, there is a potential for both radiated and conducted noise interference.
The PMA450 power supply is specifically designed to reduce conducted electrical noise on the aircraft power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise, particularly if the amplitude of noise is very high. There must be at least 13.8 VDC present at the connector, J2 pins 8 & 9, of the PMA450 for the power supply to work in its designed regulation. Otherwise, it cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon, electric gyros, switching power supplies, etc.) However, installation combinations can occur where interference is possible. The PMA450 was designed in a RFI hardened chassis and has internal Electromagnetic Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the airframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a minimum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better). Under no circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a 2- or 3-conductor, shield wire as shown on the installation-wiring diagram.
The shields can be daisy-chained together, and then connected to the ground lugs mounted on the back plate shown in Appendix B.
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PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying power wires. Keep these cables physically separated. It is very important that you use insulated washers to isolate the ground return path from the airframe to all headphone and microphone jacks.
2.4.1.1Music Inputs and Noise
PMA450 units utilize a differential input to help prevent noise from entering the music system. This feature is usually transparent to the installer; however, it is important that the appropriate music signal and ground connections are made directly to the dedicated music signal and ground inputs on the PMA450. The power for IFE and audio panel should be a common bus.
If a music jack instead of a music source is installed for Music 1 or 2, we recommend grounding the jack to airframe ground.
NOISE NOTE
Adding a high-performance audio control system, particularly in conjunction with high-performance active noise canceling headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS Engineering makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions, particularly with older avionics.
2.4.2Existing GMA340 and PMA8000 Installations
If the installation replaces a GMA340 or any of the PMA8000 series, no changes are necessary as long as the existing installation meets the requirements (applies to S/N Exxxx and above). All existing functions of the GMA340 as afforded by the PMA450 will become instantly available. However, if the previous installation had three COMs, the PMA450 will not support the third COM, the PMA450 handles only two COM transceivers. The PMA8000C will support three coms.
2.4.2.1Differences with GMA340 connector
Connector |
Pin |
GMA340 Function |
PMA450 Function |
|
|
|
|
J1 |
3 |
COM 3 |
No Connection |
|
|
|
|
J1 |
4 |
COM 3 |
No Connection |
|
|
|
|
J1 |
5 |
COM 3 |
No Connection |
|
|
|
|
J1 |
6 |
COM 3 |
No Connection |
|
|
|
|
J1 |
16 |
MASQ Inhibit |
No Connection |
|
|
|
|
J1 |
23 |
COM 3 Speaker Load |
AUX Audio Input |
|
|
|
|
J1 |
24 |
COM 3 Speaker Load |
CNX80 Inhibit |
|
|
|
|
J1 |
25 |
COM Speaker Load |
No Connection |
|
|
|
|
J1 |
26 |
COM Speaker Load |
No Connection |
|
|
|
|
J1 |
27 |
COM Speaker Load |
No Connection |
|
|
|
|
J1 |
28 |
COM Speaker Load |
No Connection |
|
|
|
|
J1 |
29 |
No Connection |
Unswitched #3 |
|
|
|
|
J2 |
15 |
High Music Gain Select |
Unswitched #4 |
|
|
|
|
J2 |
17 |
8Ω Speaker Select |
No Connection |
|
|
|
|
J2 |
18 |
No Connection |
Aux Enable Output |
|
|
|
|
J2 |
19 |
Tone Enable |
PA Enable |
|
|
|
|
J2 |
29 |
Failsafe warn |
No Connection |
|
|
|
|
J2 |
30 |
Com TX Mute |
MKR High Sense control |
|
|
|
|
Table 2-2 GMA340–PMA450 connector differences
Installations where the external marker outputs are connected to a Sandel 3308 Navigation Display will require additional loading resistors. Refer to the Sandel installation data for more information.
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PS Engineering
PMA 450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.4.3Power
The PMA450 is compatible with both 14 and 28 Volt DC systems. A five (5) Amp circuit breaker is required for all installations. Power and ground wires should be #22 connected to J2 Pins 8 and 9. Connect airframe ground to J2 Pin 10 and 11 only. No dropping resistors are required.
2.4.4Communications Push-to-Talk
An important part of the installatio n is the PTT (Push-To-Talk) switches that allow the use of your aircraft communications radio for transmisssions. There are three typical configurations that can be used. Select the case that best fits the installation. Only the person who presses their PTT switch will be he ard over the radio. If the pilot and copilot both us e the PTT, the only pilot position has access to the radio. The pilot position will have PTT control regardless of the mic selector switch or copilot PTT when the P MA450 is in the OFF/EMG mode.
CASE I: PTT is built into both pilot and copilot yokes.
CASE II: PTT is in pilot yoke only. This configuration requires a modified external PTT switch plugged into the copilot's microphone jac k. (See Appendix A). When the copilot's PTT is presse d, the intercom switches the microphone audio from pilot to copilot mic.
CASE III: No built in PTT. This requires two built in PTTs to be installed, or modified external PTT switches to be used. Modify extern al PTT as required. See Appendix A.
2.4.5Audio Panel interface
The PMA450 is designed to interf ace with standard aircraft avionics, and presents a 510 receiver impedance. For best results, a twisted-shielded cable is recommended from the avionics audio sou rce to the audio panel, with the shield grounded at the audio panel end.
Some avionics do not provide a seeparate audio low, and may introduce additional electric al noise into the system. For best results, connect th e audio low from the audio panel to the radio ground, using one conductor of the twisted-shielded cable.
2.4.5.1Speaker Load
The PMA450 contains a speaker a mplifier. The PMA450 does not contain any resistive sp eaker loads.
Some older aviation radios units w ith internal speaker amplifiers, require a resistive load. if their speaker amplifier is not used. If needed, connect the radio speaker output from the transceiver to a 16 , 3W resistor in the harness.
2.4.5.2 Installation with Monaural Headsets
Not recommended, because the b enefit of IntelliAudio is lost. However, if desired, the P MA450 can be installed monaurally by using the LEFT audio connections only (left side contains FailSafe audio). Do NOT short left and right together.
NOTE: Mono headsets that sho rt the tip and ring (i.e. older models) will introduce audio distortion when used. Modern, stereo head sets are recommended in all positions.
2.4.6Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature, this function must be disabled. Consult the radio manufacturer's installation manual.
2.4.7Backlighting
The PMA450 has an automatic d imming of the pushbutton annunciation LEDs and ma rker lamps controlled by a photocell. Control of the unit nomenclature backlighting is through the aircraft avionics dimmer For 14 V aircraft, connect J2 Pins 6 and 7 to the aircraft dimmer bus, and pin 5 to gro und. For 28-volt systems, connect pin 7 to the aircra ft dimmer, and pins 5 and 6 to ground.
If an external dimmer control is not used, a constant back light illumination can be established for nighttime viewing. Pin 6 or 7 (dep ending on system voltage) must be tied to power (J2, pi n 8 or 9) for the
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PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
back lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity of the push-button annunciator LEDs.
2.4.8Unswitched inputs
J1, pins 31 (Unsw 1), 44 (Unsw 2) 29 (Unsw 3) and J2 pin 15 (Unsw 4) are unswitched, unmuted (by transmitter keying), inputs.
These inputs are presented to the pilot and copilot regardless of the audio configuration, and will always mute the crew entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, GPS waypoint
audio, autopilot disconnect tones, or any other critical audio signal.
Unswitched #1 is always presented to the speaker, plus to the crew headphones, and is available to the pilot in fail-safe (off) mode.
Unswitched 1 & 2 are always presented to the speaker, plus to the crew headphones.
*Unswitched 3 and 4 inputs are always presented to the crew headphones but presented to the aircraft speaker only when the speaker is selected.
Unswitched |
Hear in |
Hear in |
Hear in SPR |
Adjustable at installation |
Input |
Fail Safe |
Crew Headset |
|
|
1 |
Yes |
Yes |
Yes |
No |
2 |
No |
Yes |
Yes |
No |
3 |
No |
Yes |
When SPR Selected |
Yes |
4 |
No |
Yes |
When SPR Selected |
Yes |
Table 2-3 Unswitched inputs
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient audio low. However, this should NOT be connected to Music Low.
NOTE
Inputs 1 and 2 are fixed (1:1), and any audio level adjustments must be made at the input source. Unswitched #3 and #4 can be adjusted at installation. Refer to Adjustments §2.7.
2.4.9"Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector and aircraft ground, the user can switch between Com 1 and 2 by depressing this switch without having to turn the mic selector switch. This yoke-mounted switch eliminates the need to remove your hands from the yoke to change transceivers. The transfer of TX indication from Com 1 to Com 2 shows that the swap has been initiated; there is no dedicated swap indicator.
2.4.9.1Cell phone Sidetone
The PMA450 can provide cellular telephone sidetone (the user’s voice fed back to the headset). Some cell phones provide sidetone, and may have poor audio quality if both sources are combined. The cell phone sidetone is adjustable in the Bluetooth® operation screen See §2.7.
NOTE
Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement action, which may include a $10,000 fine per incident.
FCC Regulation 47 CFR § 22.925 Prohibition on airborne operation of cellular telephones.
Cellular telephones installed in or carried aboard airplanes, balloons or any other type of aircraft must not be operated while such aircraft are airborne (not touching the ground). When any aircraft leaves the ground, all cellular telephones on board that aircraft must be turned off.
PS Engineering, Inc. does not endorse using unapproved cellular telephone equipment in flight, and takes no responsibility for the user’s action.
PS Engineering does not guarantee compatibility with personal cellular telephones.
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