PS Engineering PMA8000 Manuale utente

9800 Martel Road

Lenoir City, TN 37772

www.ps-engineering.com

Document P/N 200-890-0000

Revision 9, June 2005

Audio Selector Panel with Marker Beacon Receiver

High-fidelity Stereo Intercom

System Installation and Operation Manual

FAA-Approved TSO C50c, C35d

Patented under one or more of the following;

No. 5,903,277; 6,160,496 and 6,493,450

PS Engineering, Inc. 2005 ©

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 [email protected].

In certified aircraft, warranty is not valid unless this product is installed by an

Authorized PS Engineering dealer.

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 NOT SUPPLIED................................................................... 1-4

1.8 LICENSE REQUIREMENTS...................................................................................................... 1-4

Section II - Installation .............................................................................................. 2-1

2.1 GENERAL INFORMATION....................................................................................................... 2-1

2.1.1 SCOPE ...........................................................................................................................2-1

2.1.2 CERTIFICATION REQUIREMENTS.................................................................................... 2-1

2.2 UNPACKING AND PRELIMINARY INSPECTION ................................................................................ 2-1

2.3 EQUIPMENT INSTALLATION PROCEDURES .................................................................................... 2-1

2.3.1 COOLING REQUIREMENTS.............................................................................................. 2-1

2.3.2 MOUNTING REQUIREMENTS........................................................................................... 2-1

2.3.3 AUDIO PANEL MOUNTING RACK INSTALLATION .......................................................... 2-1

2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY....................................................... 2-2

2.4 CABLE HARNESS WIRING............................................................................................................... 2-2

2.4.1 NOISE ............................................................................................................................. 2-2

2.4.2 EXISTING GMA340 INSTALLATION ............................................................................... 2-3

2.4.3 POWER............................................................................................................................ 2-3

2.4.4 COMMUNICATIONS PUSH-TO-TALK ............................................................................... 2-3

2.4.5 AUDIO PANEL INTERFACE .............................................................................................. 2-3

2.4.6 TEL (DUPLEX) FUNCTION FOR CELL PHONES............................................................... 2-3

2.4.7 TRANSMIT INTERLOCK................................................................................................... 2-4

2.4.8 PATENTED "SWAP" MODE ............................................................................................. 2-4

2.4.9 BACKLIGHTING .............................................................................................................. 2-4

2.4.10 UNSWITCHED INPUTS ................................................................................................... 2-4

2.4.11 PUBLIC ADDRESS MODE .............................................................................................. 2-5

2.4.12 PA MUTE (J2, PIN 12) .................................................................................................. 2-5

2.4.13 MISCELLANEOUS LOGIC OUTPUT (J2, PIN 18)............................................................. 2-5

2.4.14 INTERCOM WIRING ....................................................................................................... 2-5

2.4.15 PLAYBACK BUTTON INSTALLATION (J2, PIN 22- OPTION 1, ONLY)........................... 2-7

2.5 MARKER BEACON INSTALLATION.................................................................................................. 2-7

2.5.1 MARKER ANTENNA INSTALLATION ............................................................................... 2-7

2.5.2 EXTERNAL MARKER LIGHTS.......................................................................................... 2-7

2.5.3 MIDDLE MARKER SENSE (MARKER VERSION)............................................................... 2-7

2.6 ADJUSTMENTS................................................................................................................................. 2-7

2.7 COMMUNICATIONS ANTENNA INSTALLATION NOTES................................................................... 2-8

2.7.1 AUDIO ACTIVE OUTPUT ................................................................................................. 2-8

2.8 PMA8000 PIN ASSIGNMENTS ......................................................................................................... 2-9

2.9 POST INSTALLATION CHECKOUT ................................................................................................. 2-10

2.10 UNIT INSTALLATION ................................................................................................................... 2-10

2.11 OPERATIONAL CHECKOUT ......................................................................................................... 2-10

2.11.1 REQUIRED TEST EQUIPMENT ..................................................................................... 2-10

2.11.2 AUDIO PANEL TEST.................................................................................................... 2-10

2.11.3 MARKER CHECKOUT.................................................................................................. 2-11

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page ii Revision 9, June 2005

2.11.4 TEL CHECKOUT ......................................................................................................... 2-11

2.11.5 INTERNAL RECORDER CHECKOUT (OPTIONAL)......................................................... 2-11

2.12 FINAL INSPECTION...................................................................................................................... 2-11

Section III OPERATION........................................................................................... 3-1

3.1 SCOPE............................................................................................................................................ 3-1

3.2 POWER SWITCH (1) (EMG-FAIL SAFE OPERATION) .................................................................... 3-1

3.3 MICROPHONE (2) (XMT) SELECTION (ALL MODELS) .................................................................. 3-1

3.3.1 SWAP MODE (SWITCH FROM COM 1 TO COM 2 REMOTELY) ......................................... 3-2

3.4 AUDIO SELECTOR (4)...................................................................................................................... 3-2

3.4.1 SPEAKER AMPLIFIER (5)................................................................................................. 3-2

3.5 SPLIT MODE .................................................................................................................................... 3-3

3.5.1 MUTE BUTTON, SPLIT MODE ICS (6) ............................................................................ 3-3

3.6 INTERCOM OPERATION .................................................................................................................. 3-3

3.6.1 INTELLIVOX® VOX-SQUELCH ....................................................................................... 3-3

3.6.2 INTERCOM VOLUME CONTROL (7)................................................................................. 3-4

3.6.3 INTERCOM MODES (8).................................................................................................... 3-4

3.7 TELEPHONE MODE (9).................................................................................................................... 3-5

3.8 MARKER BEACON OPERATION (10)............................................................................................... 3-6

3.9 INTERNAL RECORDER SYSTEM (OPTION 1)................................................................................... 3-6

3.10 OPERATION ................................................................................................................................... 3-6

Section IV- Warranty and Service .............................................................................4-1

4.1 WARRANTY ..................................................................................................................................... 4-1

4.2 FACTORY SERVICE.......................................................................................................................... 4-1

Appendix A External PTT Hook Up ........................................................................... A

Appendix B – PMA 8000 Installation Drawings..........................................................B

Appendix C, J1 Interconnect ........................................................................................C

Appendix D, J2 Connector Interconnect...................................................................... D

Appendix E- Instructions for FAA Form 337 and continuing airworthiness ...............E

9.1 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS ......................................................................E

9.2 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO SYSTEM..............................................E

Appendix F RTCA DO160D Environmental Qualification Form................................ F

Rev Date Change

1 3/25/04 1st Release

2 5/5/04 Clarify/correct installation kit, added note regarding the screw lengths.

3 5/13/04 Change connector back shells to 1-piece, made left/right phasing consis-

tent throughout and corrected section 2.4.3.

4 6/11/04 Change front panel pictures and button layout

5 8/23/04 Corrected P/N, text in section 2.4.1

6 11/19/04 Clarified power wiring in section 2.4.3 and figure 2-1

7 3/16/05 Added list of required test equipment in section 2.11

8 5/24/05 Corrected text description for Unswitched 3 & 4, sect 2.4.10

9 6/22/05 Added note to section 2.4.13 for DME on AUX and logic switching

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 1-1 Revision 9, June 2005

Section I GENERAL INFORMATION

1.1 INTRODUCTION

The PMA8000 represents another evolutionary step in cockpit audio control and intercommunications util-

ity. Using our patented IntelliVox® design, this unit eliminates the requirements for intercom squelch ad-

justments. 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 PMA8000.

1.2 SCOPE

This manual provides detailed installation and operation instructions for the PS Engineering PMA8000-

series of Audio Selector Panel/Intercom Systems. This includes the following units:

Model Description Part Number

PMA8000 Stereo Audio Selector Panel with Marker Beacon 050-890-0100

Option 1 Same as above with Digital Recorder added 050-890-0200

Where the functions are identical to all units, it will be referred to herein as a PMA8000. Otherwise, the

applicable units will be specified.

1.3 EQUIPMENT DESCRIPTION

The PMA8000-series is a state of the art audio isolation amplifier and audio selector that contains an auto-

matic voice activated (VOX) intercom system. It can switch two transceivers (Com 1, Com 2 ) and six re-

ceivers (Nav 1, Nav 2, ADF, DME, MKR and AUX).

A full duplex TEL mode allows the PMA8000 to act as an audio interface between aircraft headphone and

microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment.

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 PMA8000 must be interfaced with an approved system.

There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar al-

timeter warning.

Push buttons 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. All Unswitched inputs are always presented to the aircraft speaker.

Push button switches selects one of the communication transceivers for the pilot and copilot position, and

allows radio transmission. In "Split Mode" the PMA8000 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 micro-

phone to COM 1 if power is removed for any reason, or if the power switch is placed in the Off (Fail-safe)

position.

A six-station voice activated (VOX) intercom is included in the PMA8000. This system has PS Engineer-

ing’s patented IntelliVox® circuitry that eliminates manual adjustments. The system contains six separate

VOX mic circuits, and only opens the microphone channel in use.

The intercom system incorporates pilot isolate, all and crew modes, two independent stereo music inputs

with "Soft Mute," and flashing LED indications for transmit indications. Intercom control is through two

concentric front panel volume controls and a pushbutton intercom mode switch. The small volume knob

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 1-2 Revision 9, June 2005

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 Marker Beacon receiver is integrated in the PMA8000. This provides the necessary Marker Bea-

con lights and audio indications necessary for an Instrument Landing System (ILS) approach. A pushbut-

ton labeled MKR allows the pilot select high or low sensitivity as well as test and mute modes.

1.4 APPROVAL BASIS –

TSO Approval.

The PMA8000-series Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers) and

TSO C35d (Marker Beacon Receivers).

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 opera-

tion.

1.5 SPECIFICATIONS

TSO COMPLIANCE

Marker Beacon: C35d, Class A

Audio Selector/Intercom: C50c, Class A

APPLICABLE DOCUMENTS: RTCA/DO-214 RTCA/DO-143 RTCA/DO-160D

RTCA/DO-178B DO-254

ENVIRONMENTAL Qualifications: A1D1CABSMXXXXXXZBABATBXXE2XXX

Operating Temperature Range: -15º C to 55ºC

Altitude: Up to 50,000 feet in an non-pressurized area

DIMENSIONS: Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)

Depth behind panel 7.15 in. (18.16 cm)

WEIGHT

PMA8000 Unit

Rack with connectors

1.34 lb. (0.61 kg)

0.51 lb. (0.24 kg)

POWER REQUIREMENTS (Including Internal Lighting):

Voltage: 11 to 33 VDC

Maximum Current: 2.5 Amp (Externally protected by a 5A pull-type

breaker)

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 1-3 Revision 9, June 2005

Audio Selector Specifications

Audio selector panel input impedance: 510 Ω

Input Isolation: -60 dB (min.)

Speaker Muting: -60 dB (min.)

Speaker Output (into 4 Ω) with no clipping

14 VDC:

28 VDC:

3 Watts (min.)

10 Watts (min.)

Receiver Inputs: 9 (Com 1, Com 2, TEL, Nav 1, Nav 2, ADF,

DME, MKR, AUX)

Unswitched Inputs: 4

Transmitter Selections:4 (Com 1, Com 2, TEL

Com1/2)

Speaker Impedance:4 Ω

Headphone Impedance: 150 – 1000 Ω

Headphone Output: 38 mW each headset, no clipping <1% THD typi-

cal

Microphone Impedance: 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: <1% THD @ 38 mW into 150Ω

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:

Capable of: (preset at factory for field application)

1000 µVolts (Hard) (360 to 570 µV soft)

200 µVolts (Hard) (130 to 200 µV soft)

Selectivity: -6 dB at ±10 kHz

-40 dB at ±120 kHz

External Lamp Output: 7.5 (±4 VDC unloaded, at maximum brightness) VDC

positive when active, max. current 125 mA

MM Sense: Active high (4.5 ± 1.0VDC)

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 1-4 Revision 9, June 2005

1.6 EQUIPMENT SUPPLIED

1 ea. of the following units:

Model Description Part Number

PMA8000 PMA8000 Audio Panel with Marker Beacon and Stereo intercom. 050-890-0100

PMA8000 with option 1 Add Internal recorder to PMA8000 050-890-0200

PMA8000 Installation Kit: 250-890-0000

Description Quantity Part

Number

PMA8000 installation rack assembly 1 430-890-0040

PMA8000 Rack back plate 1 430-890-0050

44-pin connector kit 2 120-891-2045-

Backshell, connector 2 625-025-2465

4 40 X 7/16 screw w/nylon patch 4 475-440-0007

4 40 X 1/4 screw w/lock washer 4 475-440-0004

4-40 Lock Nut 5 475-013-0001

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

1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED

a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA8000

a) Speaker, 4 Ω

b) Headphone Jacks (Stereo, as Required)

c) Microphone Jacks (as Required)

d) Headphones, 150 Ω(Stereo), up to 6 as required

e) Microphones, up to 6 as required

f) Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed)

g) Interconnect Wiring

1.8 LICENSE REQUIREMENTS

None

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 2-1 Revision 9, June 2005

Section II - Installation

2.1 GENERAL INFORMATION

2.1.1 SCOPE

This section provides detailed installation and interconnection instructions for the PS Engineering

PMA8000-Series 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 and knowledge.

2.1.2 Certification Requirements

NOTE

The PMA8000 requires specialized knowledge and tools for an effective installation. An

appropriately rated Certified Aircraft Repair Station must install this equipment in ac-

cordance 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 in-

dividual 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 com-

ponents 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 ac-

cessories 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 Engi-

neering 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 PMA8000 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 ade-

quate cooling air provided.

2.3.2 Mounting Requirements

The PMA8000 must be rigidly mounted to the instrument panel of the aircraft structure and within view

and reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2A. The

unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.

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

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 2-2 Revision 9, June 2005

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 PMA8000. 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 (475-440-0007), from the inside of the tray. 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 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 43.13-2A 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 PMA8000 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 connec-

tor, J2 pins 8 & 9, of the PMA8000 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 inter-

ference is possible. The PMA8000 was designed in a RFI hardened chassis and has internal Electromag-

netic 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.

PS Engineering

PMA8000 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0000 Page 2-3 Revision 9, June 2005

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 installa-

tion conditions, particularly with older avionics.

2.4.2 Existing GMA340 Installation

If the installation replaces a GMA340, no changes are required except to incorporate the new capabilities

of the PMA8000.

2.4.3 Power

The PMA8000-Series are 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. Con-

nect 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 ra-

dio. If the pilot and copilot both use the PTT, the only pilot position has access to the radio. The pilot posi-

tion will have PTT control regardless of the mic selector switch or copilot PTT when the PMA8000 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 PMA8000 is designed to interface with standard aircraft avionics, and presents a 500Ωreceiver im-

pedance. 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 conduc-

tor of the twisted-shielded cable.

2.4.5.1 Speaker Load

The PMA8000 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 PMA8000 ( 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 pre-

sented to the headset. This allows a telephone-like audio interface.

The TEL mode in the PMA8000 is also compatible with many cellular telephones with hands-free headset

interfaces. A 1/8” or 3/32” jack can be installed on the aircraft panel, and interfaces with the PMA8000 as

shown: A patch cord (3/32” to 3/32”) is available from PS Engineering under P/N 425-006-7026.

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