PS Engineering 050-450-0801 Manuale utente

9800 Martel Road

Lenoir City, TN 37772

www.ps-engineering.com

PMA450C

Document P/N 200-450-0800

July 2022

Audio Selector Panel with Marker Beacon Receiver

High-fidelity Stereo Intercom, USB Charging Port

with Bluetooth® Connectivity

System Installation and Operation Manual

FAA- TSO 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,

PS Engineering, Inc. 2022 ©

Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS En-

gineering, 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.

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 
 APPROVAL BASIS...........................................................................................................................................................................................1-2 
1.4.1 LIMITATIONS.....................................................................................................................1-2 
1.5 SPECIFICATIONS ...........................................................................................................................................................................................1-3 
1.6 EQUIPMENT SUPPLIED ................................................................................................................................................................................1-4 
1.8 LICENSE REQUIREMENTS...........................................................................................................................................................................1-4 
 Section II - INSTALLATION 2-1 
 GENERAL INFORMATION............................................................................................................................................................................2-1 
2.1.1 SCOPE..............................................................................................................................2-1 
2.1.2 CERTIFICATION REQUIREMENTS ......................................................................................2-1 
 UNPACKING AND PRELIMINARY INSPECTION......................................................................................................................................................2-1 
 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.............................................................2-2 
2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY .........................................................2-2 
 CABLE HARNESS WIRING....................................................................................................................................................................................2-2 
2.4.1 ELECTRICAL NOISE...........................................................................................................2-2 
2.4.2 EXISTING GMA340 AND PMA8000 INSTALLATIONS ......................................................2-3 
2.4.3 POWER ..............................................................................................................................2-4 
2.4.4 COMMUNICATIONS PUSH-TO-TALK..................................................................................2-4 
2.4.5 AUDIO PANEL INTERFACE ................................................................................................ 2-4 
2.4.6 TRANSMIT INTERLOCK .....................................................................................................2-4 
2.4.7 BACKLIGHTING.................................................................................................................2-4 
2.4.8 UNSWITCHED INPUTS........................................................................................................2-4 
2.4.9 "SWAP"MODE ..................................................................................................................2-5 
2.4.10 PUBLIC ADDRESS MODE.................................................................................................2-5 
2.4.11 WIRED TELEPHONE/SATELLITE COMMUNICATION INPUT..............................................2-5 
2.4.12 MUSIC INPUTS.................................................................................................................2-6 
2.4.13 PLAYBACK BUTTON INSTALLATION (J2 PIN 22).............................................................2-6 
 MARKER BEACON INSTALLATION (050-450-0801, ONLY) ..................................................................................................................................2-6 
2.5.1 MARKER ANTENNA INSTALLATION .................................................................................2-6 
2.5.2 EXTERNAL MARKER LIGHTS............................................................................................2-7 
2.5.3 MIDDLE MARKER SENSE.................................................................................................. 2-7 
 USER SETUP ADJUSTMENTS.................................................................................................................................................................................2-7 
2.6.1 ADJUST SCREEN................................................................................................................2-7 
2.6.2 RENAME “SWITCHED”INPUTS.......................................................................................... 2-8 
2.6.3 VOLUME SETUP ................................................................................................................2-9 
2.6.4 BLUETOOTH®MENU ........................................................................................................2-9 
2.6.5 BLUETOOTH #2(P/N 050-450-0801 &-0901 ONLY) ......................................................2-10 
 COMMUNICATIONS ANTENNA INSTALLATION NOTES .......................................................................................................................................2-10 
 PMA450C PIN ASSIGNMENTS ...........................................................................................................................................................................2-11 
 WIRING CHECKOUT ..........................................................................................................................................................................................2-12 
 UNIT INSTALLATION..........................................................................................................................................................................................2-12 
 OPERATIONAL CHECKOUT................................................................................................................................................................................2-12 
2.11.1 REQUIRED TEST EQUIPMENT........................................................................................2-12 
2.11.2 AUDIO PANEL TEST ......................................................................................................2-12 
2.11.3 MARKER CHECKOUT (050-450--0801 ONLY)...............................................................2-13 
2.11.4 BLUETOOTH CHECKOUT...............................................................................................2-13 
2.11.5 INTERNAL RECORDER CHECKOUT................................................................................2-13 
 FINAL INSPECTION ............................................................................................................................................................................................2-13 
 Section III OPERATION 3-1 
 SCOPE................................................................................................................................................................................................................3-1 
 POWER AND FAIL SAFE (1)..................................................................................................................................................................................3-1 
 DISPLAY MENU SELECTION (6)...........................................................................................................................................................................3-1 
 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2) .......................................................................................................................................3-2 

PS Engineering 
PMA450C Audio Selector Panel and Intercom System 
Installation and Operator’s Manual 
200-450-0800 Page ii July 2022 
3.4.1 SPLIT MODE......................................................................................................................3-2 
 COM AUDIO SELECTOR (3)................................................................................................................................................................................3-2 
3.5.1 SWAP MODE (SWITCH FROM COM 1TO COM 2REMOTELY)............................................ 3-3 
3.5.2 INTELLIAUDIO®DIMENSIONAL AUDIO ...........................................................................3-3 
3.5.3 COM MONITOR MODE ......................................................................................................3-3 
3.5.4 NAVAID SELECTION (4)....................................................................................................3-3 
 SPEAKER AMPLIFIER (7) .....................................................................................................................................................................................3-4 
3.6.1 PUBLIC ADDRESS FUNCTION............................................................................................3-4 
 MARKER BEACON OPERATION (9) (PART NUMBER 050-450-0801, -0901 ONLY).................................................................................................3-5 
3.7.1 MARKER BEACON SENSITIVITY........................................................................................3-5 
 INTERCOM OPERATION (8)..................................................................................................................................................................................3-5 
3.8.1 INTELLIVOX®INTERCOM VOX-SQUELCH........................................................................3-5 
3.8.2 INTERCOM VOLUME CONTROL (1)...................................................................................3-6 
3.8.3 INTERCOM MODES (8) ......................................................................................................3-6 
 MUSIC CONTROL,DISTRIBUTION AND MUTING..................................................................................................................................................3-8 
3.9.1 MUSIC MUTING ................................................................................................................3-9 
3.9.2 MUSIC VOLUME..............................................................................................................3-10 
3.9.3 MUSIC IN PILOT ISO MODE.............................................................................................3-10 
 BLUETOOTH®CONNECTION..............................................................................................................................................................................3-10 
3.10.1 PAIRING AND UN-PAIRING BLUETOOTH DEVICES.........................................................3-10 
 BLUETOOTH®TELEPHONE MODE....................................................................................................................................................................3-11 
3.11.1 BLUETOOTH RESET.......................................................................................................3-11 
3.11.2 BLUETOOTH PIN...........................................................................................................3-12 
3.11.3 BLUETOOTH CELLULAR TELEPHONE SIDETONE ...........................................................3-12 
 WIRED SATCOM/CELL PHONE INPUT................................................................................................................................................................3-13 
 INTERNAL RECORDER AND PLAYBACK..............................................................................................................................................................3-13 
 USER SETUP MENUS.............................................................................................................................................................................................3-1 
3.14.1 ADJUST SCREEN (OLED ADJUSTMENT).........................................................................3-1 
3.14.2 RENAME “SWITCHED”INPUTS........................................................................................ 3-2 
3.14.3 OPTIONS..........................................................................................................................3-3 
 BLUETOOTH SETUP .............................................................................................................................................................................................3-3 
3.15.1 UNPAIR ALL (BLUETOOTH RESET).................................................................................3-3 
3.15.2 PIN: ................................................................................................................................3-3 
3.15.3 BLUETOOTH 1(BT1), BLUETOOTH 2(BT2) ...................................................................3-3 
3.15.4 BT1 CONFIGURATION.....................................................................................................3-4 
3.15.5 BT2 CONFIGURATION.....................................................................................................3-4 
3.15.6 VOLUME SETUP ..............................................................................................................3-5 
 USB CHARGING PORT (10) .................................................................................................................................................................................3-5 
 Section IV –Warranty and Service 4-1 
 WARRANTY .........................................................................................................................................................................................................4-1 
 FACTORY SERVICE..............................................................................................................................................................................................4-1 
 Appendix A –PMA450C Installation Drawings........................................................A 
 Appendix B –J1 Connector Interconnect ..................................................................B 
 Appendix C –J2 Connector Interconnect..................................................................C 
 Appendix D –Instructions for FAA Form 337 and continuing airworthiness .......D 
 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS............................................................................................................................................ D 
 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS,AUDIO SYSTEM.................................................................................................................... D 
 Appendix E –RTCA DO160G Environmental Qualification Form........................E 
 
Rev 
Date 
Change 
New 
July 2022 
Release of manual for PMA450C 

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 1-1 July 2022

Section I – GENERAL INFORMATION

1.1 INTRODUCTION

The PMA450C represents a revolutionary step in cockpit audio control and intercommunications utility. In-

telliAudio®, using the USAF patented technology, provides True Dimensional Sound, which helps pilots to

easily discern 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 de-

signed 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 PMA450C.

1.2 SCOPE

This manual provides detailed installation and operation instructions for the PS Engineering PMA450C-

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

Model

Part Number

Marker Receiver

PMA450C

050-450-0801

YES

PMA450C

050-450-0901

1.3 EQUIPMENT DESCRIPTION

The PMA450C 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 that can be individually

labeled, for use with ADF, DME AUX, etc.).

Warning: Use ofnon-aviation approvedcellular telephone equipmentmaybe prohibited by FCC regulation.

PS Engineering is not responsible for unauthorized airborne use of cellular telephones.

For airborne use, the PMA450C 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 allow

radio transmission. In "Split Mode”, the PMA450C 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 PMA450C. This system has PS Engineering’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 volume con-

trol 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 inter-

com volume. Intercom squelch is automatic.

PMA450C part number 050-450-0801 contains a 75 MHz Marker Beacon receiver and 3-light indicator. This

provides the necessary Marker Beacon lights and audio indications necessary for that portion of an Instrument

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 1-2 July 2022

Landing System (ILS) approach. A pushbutton labeled MKR allows the pilot select audio on as well as test

and mute modes. Marker high sensitivity is also controlled by this button.

The front panel USB-type connector is available for charging devices, such as iPad or cell phones. Up to 15

Watts and 3.5 Amps are available. This connector does NOT provide any data interface.

In the PMA450C, a Bluetooth® wireless interface is available for wireless telephone and music connection.

APPROVAL BASIS

FAA TSO Approval

The PMA450C-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 Equip-

ment), 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 Sys-

tems).

1.4.1 Limitations

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.

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 1-3 July 2022

1.5 SPECIFICATIONS

TSO COMPLIANCE

Marker Beacon:

FAA TSO C35d, Class A

Audio Selector/Intercom:

FAA TSO C139a, Class 1a

DC Charging Jack

FAA TSO C71

APPLICABLE DOCUMENTS:

RTCA/DO-214A RTCA/DO-143 RTCA/DO-160G

RTCA/DO-178C, DO-254

ENVIRONMENTAL Qualifications:

A1D1CABSMXXXXXXZBABATBXXE2XXX

Operating Temperature Range:

-15º C to 55ºC

Altitude:

Up to 35,000 feet in a non-pressurized area

DIMENSIONS:

Height: 1.3 in. (3.3 cm) Width: 6.25 in. (15.9 cm)

Depth behind panel 7.15 in. (18.16 cm)

WEIGHT

PMA450C 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:

3.5 Amp (Externally protected by a 5A pull-type breaker)

Audio Selector Specifications

Audio selector panel input impedance:

510 

Input Isolation:

-60 dB (min.)

Speaker Muting:

-60 dB (min.)

Speaker Output (into 4 ) with no clipping

14 VDC:

28 VDC:

3 Watts (min.)

10 Watts (min.)

Receiver Inputs:

7 (Com 1, Com 2, Nav 1, Nav 2, 2 ea. Additional switched

inputs available for ADF, DME, etc.)

Unswitched Inputs:

4 (Two switched inputs can be converted to unswitched, if

desired, during installation.)

Transmitter Selections:

3 (Com 1, Com 2, Com1/2)

Speaker Impedance:

4 

Headphone Impedance:

150 –1000 

Headphone Output:

30 mW each headset, no clipping <.5% THD typical

Microphone Impedance:

150 - 600 

Bluetooth® Radio

Class 3, FCC ID QOQWT32AE or QOQWT32I

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 @ 30 mW into 150

Mic Freq. Response, 3 dB:

300 Hz - 6000 Hz

Music Freq. Response, 3 dB:

10 Hz –26 kHz

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 1-4 July 2022

MARKER BEACON RECEIVER (-0801 only)

Frequency:

75 MHz Crystal Controlled

Sensitivity:

Low:

High:

Capable of: (preset at factory for field application)

1000 Volts (Hard) (360 to 570 V soft)

200 Volts (Hard) (130 to 200 V soft)

Selectivity:

-6 dB at ±10 kHz

-40 dB at ±120 kHz

External Lamp Output:

7.5 (±4 VDC unloaded, at maximum brightness) VDC posi-

tive when active, max. current 125 mA

MM Sense:

Active high (4.5 ± 1.0VDC)

USB Charging Port

Available Current

3.5A (15W Maximum) output, short circuit and over-current

protected

Voltage

5 VDC

1.6 EQUIPMENT SUPPLIED

One each of the following units:

Model

Description

Part Number

PMA450C

Digital Stereo Audio Selector Panel with Marker Beacon, IntelliAu-

dio® and USB Charging port

050-450-0801

PMA450C

Digital Stereo Audio Selector Panel, with USB Charging port, and In-

telliAudio®, without Marker Beacon

050-450-0901

PMA450 Installation Kit: 250-890-0000

Description

Quantity

Part

Number

Installation rack assembly

430-890-0040

Rack back plate

430-890-0050

44-pin connector kit

120-891-2045-

Back shell, bottom

625-025-1131

Back shell cover

625-025-1132

2-56 X 3/16 screw for connector shell

475-256-0516

4 40 X 7/16 screw w/nylon patch

475-440-0007

4 40 X 3/8 screw w/nylon patch

475-440-1038

4-40 x ¼” screw with lock washer

475-440-0001

Solder Lug

475-009-0001

Cable Clamp

625-001-0002

#6-32 x ½” Flat head Philips screw

475-632-0012

#6-32 Clip Nut

475-630-0002

EQUIPMENT REQUIRED BUT NOT SUPPLIED

a. Circuit Breaker: 1 ea.; 5 amp PULL TYPE REQUIRED for PMA450C

b. Speaker, 4 as desired

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) (-08010801, Only)

h. Interconnect Wiring

1.8 LICENSE REQUIREMENTS

None

PMA450C Bluetooth™ Radio approval:

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 1-5 July 2022

•FCC ID: QOQWT32AE or QOQWT32I

•Industry Canada ID: 5123A-BGTWT32AE, or 5123-BGTWT32I

•CE EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC

NOTE

Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement ac-

tion, 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.

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 2-1 July 2022

Section II - INSTALLATION

GENERAL INFORMATION

2.1.1 SCOPE

This section provides detailed installation and interconnection instructions for the PS Engineering PMA450C

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).

2.1.2 Certification Requirements NOTE

The PMA450C requires specialized knowledge and tools for an effective installation. An appropriately

rated Certified Aircraft Repair Station must install this equipment in accordance with applicable regula-

tions. 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.

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 §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 cir-

cumstances 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.

Equipment Installation Procedures

2.3.1 Cooling Requirements

Forced air-cooling of the PMA450C is not required. However, the units should be kept away from heat pro-

ducing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate

cooling air provided.

2.3.2 Mounting Requirements

The PMA450C 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.

PS Engineering

PMA450C Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-450-0800 Page 2-2 July 2022

2.3.3 Audio Panel Mounting Rack Installation

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.

2.3.4 Audio Panel Tray and Connector Assembly

The rack connectors mate with two 44-pin connectors in the PMA450C. 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. The connector back

shell is two pieces, (625-025-1131 and cover 625-025-1132) held together by 4 #2-56 screws (475-256-0516).

This allows the back shell to be installed after the connector is populated.

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 ter-

minations.

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

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 sol-

dering 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 Electrical 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 PMA450C 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 PMA450C 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 PMA450C was designed in an RFI hardened chassis and has internal Electromagnetic Inter-

ference (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 air-

frame that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a min-

imum 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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