PS Engineering PMA8000B--MP3 Installation And Operation Manual
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
P
M
P
Audio Selector Panel with Marker Beacon Receiver
High-fidelity Stereo Intercom with Internal MP3 Player
System Installation and Operation Manual
Patented under one or more of the following;
No. 4,941,187; 5,903,227; 6,160,496 and 6,493,450
A88000000
M
A
Document P/N 200-890-0600
New Release July 2008
FAA- TSO C50c, C35d
EASA ETSO C50c, 2C34d
B--
B
M
M
P33
P
In certified aircraft, warranty is not valid unless this product is installed by an
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.
Authorized PS Engineering dealer.
PS Engineering, Inc. 2008 ©
Copyright Notice
Table of Contents
Section I – GENERAL INFORMATION............................................................................................................... 1-1
1.1 INTRODUCTION........................................................................................................................................... 1-1
1.2 SCOPE ............................................................................................................................................................. 1-1
1.3 EQUIPMENT DESCRIPTION...................................................................................................................... 1-1
1.4 APPROVAL BASIS........................................................................................................................................ 1-2
1.5 SPECIFICATIONS......................................................................................................................................... 1-2
1.6 EQUIPMENT SUPPLIED ............................................................................................................................. 1-4
1.7 EQUIPMENT REQUIRED BUT
1.8 OPTIONAL ITEMS ....................................................................................................................................... 1-4
1.9 LICENSE REQUIREMENTS........................................................................................................................ 1-4
Section II - INSTALLATION ................................................................................................................................ 2-1
2.1 GENERAL INFORMATION ........................................................................................................................ 2-1
2.1.1 SCOPE.......................................................................................................................................................... 2-1
2.1.2 C
2.2 U
2.3 E
2.3.1 C
2.3.2 M
2.3.3 A
2.3.4 A
2.4 C
2.4.1 N
2.4.2 E
2.4.3 P
2.4.4 C
2.4.5 A
2.4.6 TEL (D
2.4.7 T
2.4.8 "S
2.4.9 B
2.4.10 U
2.4.11 P
2.4.12 PA M
2.4.13 M
2.5 I
2.5.1 E
2.5.2 E
2.5.3 C
2.5.4 P
2.6 M
2.6.1 M
2.6.2 E
2.6.3 M
2.7 A
2.8 C
2.8.1 A
2.9 PMA8000B-MP3 P
2.10 P
2.11 U
2.12 O
2.12.1 R
2.12.2 A
2.12.3 M
2.12.4 TEL C
2.12.5 I
2.12.6 F
2.12.7 MP3 P
2.13 F
ERTIFICATION REQUIREMENTS ..................................................................................................................... 2-1
NPACKING AND PRELIMINARY INSPECTION ................................................................................................... 2-1
QUIPMENT INSTALLATION PROCEDURES........................................................................................................ 2-1
OOLING REQUIREMENTS............................................................................................................................... 2-1
OUNTING REQUIREMENTS............................................................................................................................ 2-1
UDIO PANEL MOUNTING RACK INSTALLATION ............................................................................................. 2-1
UDIO PANEL TRAY AND CONNECTOR ASSEMBLY.......................................................................................... 2-2
ABLE HARNESS WIRING ................................................................................................................................. 2-2
OISE ............................................................................................................................................................ 2-2
XISTING GMA340 INSTALLATION ................................................................................................................ 2-3
OWER ........................................................................................................................................................... 2-3
OMMUNICATIONS PUSH-TO-TALK................................................................................................................. 2-3
UDIO PANEL INTERFACE............................................................................................................................... 2-3
UPLEX) FUNCTION FOR CELL PHONES................................................................................................. 2-4
RANSMIT INTERLOCK ................................................................................................................................... 2-4
WAP" MODE ............................................................................................................................................... 2-4
ACKLIGHTING .............................................................................................................................................. 2-5
NSWITCHED INPUTS ................................................................................................................................... 2-5
UBLIC ADDRESS MODE .............................................................................................................................. 2-6
UTE (J2, PIN 12) ................................................................................................................................. 2-6
ISCELLANEOUS LOGIC OUTPUT (J2, PIN 18) .............................................................................................. 2-6
NTERCOM WIRING............................................................................................................................................ 2-6
NTERTAINMENT INPUTS ................................................................................................................................2-6
NTERTAINMENT MUTING............................................................................................................................... 2-7
ONFIGURING MUSIC INPUT WITH FUNCTION KEYS ........................................................................................ 2-7
LAYBACK BUTTON INSTALLATION................................................................................................................. 2-7
ARKER BEACON INSTALLATION .................................................................................................................... 2-8
ARKER ANTENNA INSTALLATION................................................................................................................. 2-8
XTERNAL MARKER LIGHTS........................................................................................................................... 2-8
IDDLE MARKER SENSE ................................................................................................................................2-8
DJUSTMENTS................................................................................................................................................... 2-8
OMMUNICATIONS ANTENNA INSTALLATION NOTES....................................................................................... 2-9
UDIO ACTIVE OUTPUT ................................................................................................................................. 2-9
IN ASSIGNMENTS ............................................................................................................. 2-10
OST INSTALLATION CHECKOUT ................................................................................................................. 2-11
NIT INSTALLATION ..................................................................................................................................... 2-11
PERATIONAL CHECKOUT ........................................................................................................................... 2-11
EQUIRED TEST EQUIPMENT ...................................................................................................................... 2-11
UDIO PANEL TEST ................................................................................................................................... 2-11
ARKER CHECKOUT.................................................................................................................................. 2-12
HECKOUT ........................................................................................................................................ 2-12
NTERNAL RECORDER CHECKOUT .............................................................................................................. 2-12
UNCTION BUTTON CHECKOUT .................................................................................................................. 2-12
LAYER CHECKOUT (-0602 ONLY) .................................................................................................... 2-12
INAL INSPECTION........................................................................................................................................ 2-12
Section III OPERATION........................................................................................................................................ 3-1
NOT SUPPLIED..................................................................................... 1-4
PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
3.1 SCOPE ............................................................................................................................................................. 3-1
3.2 C
3.3 A
3.4 T
3.5 S
3.6 M
3.7 I
3.7.1 I
3.7.2 I
3.7.3 I
3.8 M
3.9 T
3.10 U
3.10.1 C
3.10.2 A
3.10.3 M
3.10.4 S
3.10.5 F
3.10.6 F
3.10.7 F
3.11 MP3 M
3.12 MP3 P
3.13 M
3.14 F
3.15 I
3.15.1 P
OMMUNICATIONS TRANSMIT (XMT) SELECTION (2) .................................................................................... 3-1
UDIO SELECTOR (4) ........................................................................................................................................ 3-2
ELEPHONE (TEL) (9)...................................................................................................................................... 3-2
PEAKER AMPLIFIER (5)................................................................................................................................... 3-3
ARKER BEACON OPERATION (10).................................................................................................................. 3-3
NTERCOM OPERATION..................................................................................................................................... 3-4
NTELLIVOX® VOX-SQUELCH........................................................................................................................ 3-4
NTERCOM VOLUME CONTROL (7) .................................................................................................................. 3-4
NTERCOM MODES (8) .................................................................................................................................... 3-5
USIC MUTING (6) ........................................................................................................................................... 3-5
ELEPHONE MODE (9) ...................................................................................................................................... 3-5
TILITY JACK ................................................................................................................................................. 3-6
ELLULAR PHONE ........................................................................................................................................ 3-6
UDIO ADVISORY INPUT.............................................................................................................................. 3-6
USIC INPUT ............................................................................................................................................... 3-7
MART FUNCTION KEYS (SFK).................................................................................................................... 3-7
UNCTION “A”............................................................................................................................................. 3-8
UNCTION “B”............................................................................................................................................. 3-8
UNCTION “C”............................................................................................................................................. 3-9
USIC CONTROLS (PMA8000B-MP3 MP3 –0602 ONLY) ............................................................... 3-10
LAYER OPERATION............................................................................................................................ 3-10
USIC 1 & MP3 VOLUME (H & I) ............................................................................................................... 3-11
ILE TRANSFER ............................................................................................................................................ 3-11
NTERNAL RECORDER................................................................................................................................... 3-11
LAYBACK................................................................................................................................................. 3-11
Section IV – Warranty and Service ........................................................................................................................ 4-1
4.1 W
4.2 F
ARRANTY ....................................................................................................................................................... 4-1
ACTORY SERVICE............................................................................................................................................ 4-1
Appendix A – External PTT Hook Up ......................................................................................................................A
Appendix B – PMA 8000 Installation Drawings .......................................................................................................A
Appendix C – J1 Connector Interconnect..................................................................................................................B
Appendix D – J2 Connector Interconnect..................................................................................................................A
Appendix E – Instructions for FAA Form 337 and continuing airworthiness ...........................................................A
9.1 I
NSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS..........................................................................................A
9.2 I
NSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO SYSTEM ..................................................................A
Appendix F – RTCA DO160D Environmental Qualification Form ..........................................................................A
Rev Date Change
New 7/7/08 Created for PMA8000B-MP3 MP3 version
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The PMA8000B-MP3 represents another evolutionary step in cockpit audio control and intercommunications utility. Using our patented IntelliVox® design, front panel utility jack, and pilot programmable configurations, this marks 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 PMA8000B-MP3.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA8000BMP3-series of Audio Selector Panel/Intercom Systems. This includes the following units:
Description Part Number
Model
PMA8000B-MP3 Stereo Audio Selector Panel with Marker Beacon, includes
utility jack and Internal Recorder System with internal 1G
MP3 player
050-890-0602
1.3 EQUIPMENT DESCRIPTION
The PMA8000B-MP3 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, ADF, DME, MKR and AUX).
The PMA8000B-MP3 version (050-890-0602) incorporates an internal MP3 Player with one gigabyte of
memory. This is controlled through secondary functions on the front panel.
A full duplex TEL mode allows the PMA8000B-MP3 to act as an audio interface between aircraft headphone and microphones and specific aircraft approved
the front mounted jack.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PMA8000B-MP3 must be interfaced with an approved system.
There are five unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar
altimeter warning, with the fifth unswitched input through a front-mounted utility jack, when configured to
act as a fifth unswitched input.
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 1,3, and 4 are always presented to the aircraft speaker.
Unswitched input 2 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 PMA8000B-MP3 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 (Failsafe) position. Unswitched input #1 is also provided to the pilot headphone in fail-safe
(FAA/FCC) cellular telephone equipment, through
A six-station voice activated (VOX) intercom is included in the PMA8000B-MP3. This system has PS Engineering’s patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incor-
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
porates pilot isolate, all and crew modes, two independent stereo music inputs with "SoftMute™". Intercom volume 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 3-light, 75 MHz Marker Beacon receiver is integrated in the PMA8000B-MP3. This provides the necessary Marker Beacon lights and audio indications necessary for that portion of an Instrument Landing System (ILS) approach. A pushbutton labeled MKR allows the pilot select high or low sensitivity as well as
test and mute modes.
1.4 APPROVAL BASIS
FAA TSO Approval.
The PMA8000B-MP3-series Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers) and TSO C35d (Marker Beacon Receivers), ETSO C50C/ and 2C53d.
All systems comply with relevant portions of EUROCAE RTCA MPS WG No. 7/70, DO-143 and (Marker
Beacon Receivers), ED-14C/DO-160C (Environmental Conditions and Test Procedures for Airborne
Equipment), ED12B/DO-178B, Level D (Software Considerations for Airborne Equipment) and ED-
18/DO-214 (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft
Audio Systems).
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
Marker Beacon:
Audio Selector/Intercom:
APPLICABLE DOCUMENTS:
ENVIRONMENTAL Qualifications:
Operating Temperature Range:
Altitude:
DIMENSIONS:
WEIGHT
PMA8000B-MP3 Unit
Rack with connectors
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
Maximum Current:
TSO COMPLIANCE
FAA TSO C35d, Class A ETSO 2C35d
FAA TSO C50c, Class 1a ETSO C50c
RTCA/DO-214 RTCA/DO-143 RTCA/DO-160D
RTCA/DO-178B DO-254
A1D1CABSMXXXXXXZBABATBXXE2XXX
-15º C to 55ºC
Up to 50,000 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)
11 to 33 VDC
2.5 Amp (Externally protected by a 5A pull-type
breaker)
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
Audio Selector Specifications
Audio selector panel input impedance:
Input Isolation:
Speaker Muting:
Speaker Output (into 4 Ω) with no clipping
14 VDC:
28 VDC:
Receiver Inputs:
Unswitched Inputs:
Transmitter Selections:
Speaker Impedance:
Headphone Impedance:
Headphone Output:
Microphone Impedance:
510 Ω
-60 dB (min.)
-60 dB (min.)
3 Watts (min.)
10 Watts (min.)
9 (Com 1, Com 2, TEL, Nav 1, Nav 2, ADF, DME,
MKR, AUX)
5 (including front jack)
4 (Com 1, Com 2, TEL
Com1/2)
4 Ω
150 – 1000 Ω
38 mW each headset, no clipping <1% THD typical
150 - 600 Ω
Intercom Specifications
Intercom Positions: 6 places (with individual IntelliVox® circuits)
Music Inputs: 2, (Independent, Stereo)
Music Muting: >-30 dB "Soft Mute" when Com or intercom active.
Distortion:
Mic Freq. Response, 3 dB: 300 Hz - 6000 Hz
Music Freq. Response, 3 dB: 10 Hz – 26 kHz
MARKER BEACON RECEIVER:
Frequency: 75 MHz Crystal Controlled
Sensitivity:
Low:
High:
Selectivity: -6 dB at ±10 kHz
External Lamp Output: 7.5 (±4 VDC unloaded, at maximum brightness) VDC
MM Sense: Active high (4.5 ± 1.0VDC)
<1% THD @ 38 mW into 150Ω
Capable of: (preset at factory for field application)
1000 µVolts (Hard) (360 to 570 µV soft)
200 µVolts (Hard) (130 to 200 µV soft)
-40 dB at ±120 kHz
positive when active, max. current 125 mA
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model Description Part Number
PS Engineering
PMA8000B-MP3 PMA8000B-MP3 Audio Panel with Marker Beacon and Stereo
intercom, includes internal 1G MP3 Player
050-890-0602
PMA8000B- Installation Kit: 250-890-0000
Description Quantity Part
Number
PMA8000B-MP3 installation rack assembly 1 430-890-0040
PMA8000B-MP3 Rack back plate 1 430-890-0050
44-pin connector kit 2 120-891-2045Backshell, connector 2 625-025-2465
Backshell Retainer 2 431-881-0100
4 40 X 7/16 screw w/nylon patch 4 475-440-0007
4 40 X 3/8 screw w/lock washer 4 475-440-1038
4-40 Lock Nut 1 475-013-0001
Solder Lug 1 475-009-0001
Cable Clamp 1 625-001-0002
#6-32 x ½” Flat head Philips screw 6 475-632-0012
#6-32 Clip Nut 6 475-630-0002
Included with PMA8000B-MP3 MP3: Cable, USB to 2.5 mm 4-conductor, PS Part Number 425-921-3983
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA8000B-MP3
b. Speaker, 4 Ω
c. Headphone Jacks (Stereo, as Required)
d. Microphone Jacks (as Required)
e. Headphones, 150 Ω (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)
h. Interconnect Wiring
1.8 OPTIONAL ITEMS
a. Cell Phone Patch Cord, 2.5mm to 2.5mm, PS Part Number 425-006-7026
b. Music Patch Cord, 3.5mm to 5.5mm, PS Part Number 425-006-2535
c. USB-to-USB adapter PS Part number 425-003-1454
1.9 LICENSE REQUIREMENTS
None
Note: The PMA8000B-MP3 only supports Wave (.wav), unprotected Windows Media Files (.wma)
and MP3 (.mp3) file types. It does not support iTunes format files.
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering
PMA8000B-MP3 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 section 2.12.1) and
knowledge as required by 14 CFR 65.81 (b).
2.1.2 Certification Requirements
NOTE
The PMA8000B-MP3 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.
2.2 Unpacking 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 Section 1.6 (B). 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.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air-cooling of the PMA8000B-MP3 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.
2.3.2 Mounting Requirements
The PMA8000B-MP3 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 43.132A. 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.
2.3.3 Audio 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
200-890-0600 Page 2-1 July 2008
PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
FHP 6-32 x ½" screws (475-632-0012). The audio selector panel must be supported at front and rear of the
mounting tray.
2.3.4 Audio Panel Tray and Connector Assembly
The rack connectors mate with two 44-pin connectors in the PMA8000B-MP3. The connectors are a subminiature 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).
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
2.4 Cable 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. Two- and 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.
2.4.1 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 PMA8000B-MP3 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 PMA8000B-MP3 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 PMA8000B-MP3 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 a ground lug mounted on the corner of
the back plate.
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.
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
2.4.1.1 Music Inputs and Noise
PMA8000B-MP3 units above Serial Number J01861 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 PMA8000B-MP3. The power for IFE and audio panel should be a common bus.
If a music jack is installed for Music 1 or 2, we strongly recommend isolating the jack from airframe
ground, by using an insulated mounting plate.
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.
2.4.2 Existing GMA340 Installation
If the installation replaces a GMA340, no changes are necessary as long as the existing installation meets
the requirements. All existing functions of the GMA340 as well as all of the new capabilities afforded by
the PMA8000B-MP3 will become instantly available. Be advised, the PMA8000B-MP3 does not support
3
VHF Coms, however. The PMA8000B-MP3 handles two COM transceivers and a full-duplex cellular/satellite telephone.
Added capabilities include, IntelliVox®, DuTel™ duplex telephone, improved music fidelity and Soft
Mute™ and Karaoke™ muting modes, improved and more flexible music distribution control, internal
recorder function, and additional unswitched audio inputs.
2.4.3 Power
The PMA8000B-MP3 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.
2.4.4 Communications Push-to-Talk
An important part of the installation is the PTT (Push-To-Talk) switches that allow the use of your aircraft
communications radio for transmissions. 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 heard over the radio. If the pilot and copilot both use 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 PMA8000B-MP3
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 jack. (See Appendix A). When the copilot's PTT is pressed, 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 external PTT as required. See Appendix A.
2.4.5 Audio Panel interface
The PMA8000B-MP3 is designed to interface with standard aircraft avionics, and presents a 500 Ω receiver impedance. For best results, a twisted-shielded cable is recommended from the avionics audio
source to the audio panel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one conductor of the twisted-shielded cable.
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
2.4.5.1 Speaker Load
The PMA8000B-MP3 contains one speaker amplifier. Some units with internal speaker amplifiers, such as
the King Radio KX170-series, require a resistive load to prevent damage if their speaker amplifier is not
used. Connect the speaker output from the unit to the COM 2 Speaker load input on the PMA8000B-MP3
(J1 27 WRT 28). The speaker load is 16 Ω, 3W.
2.4.6 TEL (Duplex) Function for Cell Phones
This mode is designed to operate with telecommunications systems, such as the AirCell Guardian 1000.
Audio streams selected by the intercom mode are provided to the Tel output, and audio from Tel is presented to the headset. This allows a telephone-like audio interface.
The TEL mode in the PMA8000B-MP3 is also compatible with many cellular telephones with hands-free
headset interfaces. The front panel 3/32” utility jack can be used as the interface to the Cell Phone, or a
3/32” jack can be installed somewhere on the aircraft panel. The wired interface jack is connected with the
PMA8000B-MP3 as shown: A patch cord (3/32” to 3/32”) is available from PS Engineering under P/N
425-006-7026.
Cellular Plug (typical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
Cellular Phone
Interconnect
Com 3 Audio
COM 3 Mic Input
Audio Lo
3/32" Cellular Jack
This is a typical interconnect
PS Engineering does not guarantee
compatability in all cases.
Figure 2-1 Cellular telephone interface for rear connector, if an additional jack is desired
2.4.6.1 Cell phone Sidetone
As shipped from PS Engineering, the PMA8000B-MP3 provides cellular telephone sidetone (the user’s
voice fed back to the headset). Some cell phones provide sidetone, which may result in loud or distorted
sidetone. In this case, an internal modification can be made that will prevent the PMA8000B-MP3 from
providing this sidetone. Contact PS Engineering for more information.
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. 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. For a list of phones that
have been tested, visit www.ps-engineering.com.
2.4.7 Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature,
this function must be disabled. Consult that manufacturer's installation manual.
2.4.8 "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
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PMA8000B-MP3 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PS Engineering
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 Backlighting
The PMA8000B-MP3 has an automatic dimming of the pushbutton annunciation LEDs and marker lamps
controlled by a photocell. Control of the unit 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 ground. For 28-volt systems, connect pin 7 to the aircraft 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 (depending on system voltage) must be tied to power (J1, pin 8 or 9) for the back
lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity of
the push-button annunciator LEDs.
2.4.10 Unswitched inputs
J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3 and 4, respectively. These inputs are presented to the pilot and copilot regardless of the audio configuration, and will
always mute the 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 3 and 4 inputs are always presented to the crew headphones and to the aircraft speaker.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Head-
set
SPR but-
ton
Select
Gain
1 Yes Yes No 1:1(fixed)
2 No Yes Yes 1:1(fixed)
3 No Yes No Adjust-
able
4 No Yes No 1:1(fixed)
5 (jack) No Yes No 1:1(fixed)
Table 2-2 Unswitched input table
Unswitched #2, J1 pin 44 is unswitched is always connected to the Pilot’s headphone. However, this
unswitched audio is only presented to the aircraft speaker when the SPR push button has been selected.
This input would be suitable for air-to-ground (Flitefone) telephone ringer. This input is not related to the
cellular telephone interface.
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.
Unswitched #1 is presented to the pilot headphone in fail-safe (off) mode.
NOTE
Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 has a variable adjustment control located on the bottom side of the unit. This control allows
you to control the volume level of that unswitched input from 50% to 200% of the input level. Refer to
Adjustments section.
The front panel jack can be configured to act as a fifth unswitched input. When configured through the
front panel function switches (see operational section), the audio input to this jack will be presented to the
pilot and copilot headset, and not muted.
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