PS Engineering PAR200A User manual

9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PAR200A
With Trig Avionics TY91 (L) or TY92 (L)
Document P/N 200-228-0200
Rev. 4, December 2017
Audio Selector Panel with VHF Communications Transceiver and
High-fidelity Stereo Intercom
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
PS Engineering, Inc. 2017 ©
Copyright Notice
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 [phone], email [e-mail].
FAA-TSO C139, TSO C169a (PARTIAL)
EASA ETSO C139, 2C169A (PARTIAL)
The product 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 —FAA TSO, EASA ETSO...........................................................................1-2
1.1.1 PAR200A .........................................................................................................................1-2
1.1.2 TRIG TY91/92-SERIES:.....................................................................................................1-2
1.5 SPECIFICATIONS..........................................................................................................................1-2
1.6 EQUIPMENT SUPPLIED............................................................................................................... 1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED......................................................................1-5
1.8 LICENSE REQUIREMENTS.........................................................................................................1-5
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 TRIG TY91/TY92 MOUNTING REQUIREMENTS.................................................................2-2
2.3.4 AUDIO PANEL MOUNTING RACK INSTALLATION............................................................. 2-2
2.4 CABLE HARNESS WIRING .................................................................................................................2-2
2.4.1 NOISE................................................................................................................................ 2-2
2.4.2 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY .........................................................2-3
2.4.3 AUDIO PANEL INTERFACE ................................................................................................2-3
2.5 TY91/92 VHF COM INTERFACE .....................................................................................................2-4
2.5.1 TY91 CONNECTOR (TRIG TY91(L) TY92(L) -05 ONLY)..................................................2-4
2.5.2 INTERFACING THE TY91/92(L) AS SINGLE,COM 1OR COM 2.......................................2-4
2.5.3 ANTENNA CABLE.............................................................................................................. 2-4
2.5.4 TY91/92 TNC ANTENNA CONNECTION............................................................................2-5
2.5.5 VHF COMMUNICATIONS ANTENNA INSTALLATION.........................................................2-5
2.6 TELEPHONE (DUPLEX)FUNCTION FOR BLUETOOTH ®CAPABLE CELL PHONES ......................2-6
2.6.1 PAIRING SEPARATE MUSIC AND TELEPHONE DEVICES......................................................2-6
2.6.2 TELEPHONE SIDETONE......................................................................................................2-7
2.6.3 "SWAP"MODE ..................................................................................................................2-7
2.6.4 BACKLIGHTING................................................................................................................. 2-7
2.6.5 UNSWITCHED INPUTS........................................................................................................2-7
2.7 INTERCOM WIRING............................................................................................................................2-8
2.7.1 PAR200A WITH EXPANSION UNIT (050-228-0202 WITH P/N 11636 INTELLIPAX
EXPANSION................................................................................................................................... 2-8
2.7.2 MUSIC INPUTS...................................................................................................................2-9
2.7.3 MUSIC MUTING .................................................................................................................2-9
2.8 ADJUSTMENTS ...................................................................................................................................2-9
2.9 MICROPHONE GAIN REDUCTION.....................................................................................................2-10
2.10 COMMUNICATIONS ANTENNA INSTALLATION NOTES .................................................................2-11
2.10.1 ANTENNA LOCATION....................................................................................................2-11
2.11 TY91/92(L) ADJUSTMENTS...........................................................................................................2-11
2.11.1 RADIO SIDETONE &RADIO SQUELCH ADJUSTMENT ...................................................2-11
2.11.2 RADIO FREQUENCY SPACING,25 KHZ OR 8.33 KHZ.....................................................2-11
2.12 PAR200A PIN ASSIGNMENTS........................................................................................................2-13
2.13 POST INSTALLATION CHECKOUT .................................................................................................2-14

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page ii Rev. 4, DEC. 2017
2.14 UNIT INSTALLATION......................................................................................................................2-14
2.15 OPERATIONAL CHECKOUT ...........................................................................................................2-14
2.15.1 TY91/92 CHECKOUT.....................................................................................................2-14
2.15.2 TELEPHONE CHECKOUT............................................................................................2-15
2.16 FINAL INSPECTION ........................................................................................................................2-15
Section III OPERATION.............................................3-1
3.1 SCOPE ..............................................................................................................................................3-1
3.2 POWER AND FAIL SAFE (1)................................................................................................................3-1
3.2.1 TY91/92(L) RADIO POWER (AS COM 1ONLY) ................................................................3-1
3.2.2 ICS AND RADIO VOLUME CONTROLS (1).........................................................................3-1
3.3 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2)....................................................................3-2
3.4 COM AUDIO SELECTOR (3).............................................................................................................. 3-2
3.5 NAVAID AUDIO SELECTION (4)..........................................................................................................3-2
3.6 COCKPIT SPEAKER (10) ....................................................................................................................3-2
3.7 VHF TRANSCEIVER CONTROL (5) ....................................................................................................3-3
3.7.1 FREQUENCY SELECTION (6)..............................................................................................3-3
3.7.2 RADIO SQUELCH...............................................................................................................3-4
3.7.3 MONITOR MODE (WHEN PAR200A IS COM 1OR STAND ALONE ONLY).........................3-4
3.7.4 TUNING 8.33 KHZ CHANNEL SPACING.............................................................................. 3-5
3.8 INTERCOM OPERATION (8)...............................................................................................................3-6
3.8.1 INTELLIVOX®VOX-SQUELCH..........................................................................................3-6
3.8.2 MONO HEADSETS IN STEREO INSTALLATION ...................................................................3-6
3.8.3 INTERCOM MODES (8) ......................................................................................................3-7
3.9 BLUETOOTH OPERATION...................................................................................................................3-7
3.9.1 BLUETOOTH TELEPHONE CONNECTION ...........................................................................3-7
3.9.2 TELEPHONE (TEL) OPERATION........................................................................................3-7
3.10 MUSIC INPUTS .................................................................................................................................3-8
3.10.1 MUSIC MUTING (9)......................................................................................................... 3-8
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 –PAR200A Installation Drawings.............................................................B
6.1 TY91/92 RADIO INSTALLATION DRAWINGS .......................................................................................B
Appendix C –J1 Connector Interconnect .....................................................................C
Appendix D –J2 Connector Interconnect .................................................................... D
8.1 EXPANSION UNIT INTERCONNECT (050-228-0202 ONLY).................................................................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
9.3 ICA FOR TRIG TY91/92 RADIO:..........................................................................................................E
Appendix F –RTCA DO160G Environmental Qualification Form...............................F
Rev
Date
Change
0
June 2014
Release of PAR200A version
1
July 2015
EASA Approval Incorporated
2
September 2015
Corrected wiring diagram Fig 7-1.
3
June 2017
Extend applicability to include Trig TY92L
4
December 2017
Add passenger intercom expansion capability, 050-228-0202 ONLY

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 1-1 Rev. 4, DEC. 2017
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The PAR200A represents another evolutionary step in cockpit audio control and intercommunications utility.
Using our patented IntelliVox® design 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 PAR200A.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PAR200A-series
of Audio Selector Panel/Intercom Systems. This includes the following units:
Model
Description
PS Engineering
Part Number
PAR200A
Stereo Audio Selector Panel with control for VHF Commu-
nications radio. Includes stereo intercom, with Bluetooth In-
terface
050-228-0200
PAR200A
Same as above, with passenger expansion to 8 stations (Pilot,
copilot + 6 passengers.
050-228-0202
TY91(L)
VHF Communications Transceiver
050-228-8744
or
TY92(L)
VHF Communications Transceiver (28 VDC Systems only)
050-228-8745
1.3 EQUIPMENT DESCRIPTION
The PAR200A is a state-of-the-art audio isolation amplifier and audio selector that contains an automatic
voice activated (VOX) intercom system and serial data control/indication for a Trig VHF communications
receiver. It can switch two transceivers (Com 1, Com 2) and two receivers (Nav 1, Nav 2).
A Bluetooth ® TELEPHONE feature allows the PAR200A to interface the aircraft headset(s) and Bluetooth
enabled cellular devices.
Warning: Useofnon-aviationapprovedcellulartelephone equipmentmaybeprohibitedbyregulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PAR200A must be interfaced with an approved system.
There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect tones, and/or radar
altimeter warning.
Pushbutton switches select one of the communication transceivers for the pilot and copilot positions, and
allow radio transmission. In "Split Mode”, the PAR200A 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 in fail-safe
A four-station (eight-station in -0202 with expansion unit) voice activated (VOX) intercom is included in the
PAR200A. This system has PS Engineering’s patented IntelliVox® circuitry that eliminates manual adjust-
ments. The intercom system incorporates pilot isolate, all and crew modes, two independent stereo music
inputs with "SoftMute™". Volume control is through the concentric front panel knobs and a pushbutton
intercom mode switch. The small knob controls the intercom volume level for the all headsets, while the
large knob controls the VHF Com radio volume. Intercom squelch is automatic.
A concentric rotary data input knob on the right side of the unit controls the TY9XL VHF COM radio fre-
quency selection.

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 1-2 Rev. 4, DEC. 2017
1.4 APPROVAL BASIS —FAA TSO, EASA ETSO
1.1.1 PAR200A
The PAR200A-series Audio Selector Panels have FAA authorization under TSO C139 (Aircraft Audio Sys-
tems and Equipment). The VHF Communication Transceiver portion of the PAR200A holds TSO authori-
zations under TSO C169a.
The PAR200A-series Audio Selector Panels hold EASA authorization under ETSO C139 (Aircraft Audio
Systems and Equipment). The VHF Communication Transceiver portion of the PAR200A is EASA author-
ized under ETSO-2C169a. EASA.IM.210.10053809.
The partial TSO applies to C169a because the PAR200A unit provides control and display only for the TY91-
series of VHF communications equipment.
The audio system complies with relevant portions of ED-14C/DO-160G (Environmental Conditions and Test
Procedures for Airborne Equipment), DO-254, (Design Assurance Guidance for Airborne Electronic Hard-
ware) and ED-18/DO-214 (Audio Systems Characteristics and Minimum Operational Performance Stand-
ards for Aircraft Audio Systems). NOTE:
The conditions and tests for TSO approval of this article are minimum performance standards.
Those installing this article, on or in a specific type or class of aircraft, must determine that the
aircraft installation conditions are within the TSO standards. The article may be installed only
following 14 CFR Part 43 or the applicable airworthiness requirements.
1.1.2 Trig TY91/92-Series:
The VHF Communication Radio (Trig Avionics TY91L/TY92L) is EASA and FAA-approved under
ETSO 210.10042695, Rev, B or Subsequent Revision, under 2C169a Class C, E, H1, H2, 4, 6, ETSO
2C128, TSO C169a Class C, E, 4, 6, TSO C128a TSO-C169a, ETSO 2C169a Class C, E, H1, H2, 4, 6,
ETSO 2C128, TSO C169a Class C, E, 4, 6, TSO C128a EUROCAE ED-23C, EUROCAE ED-67,
EUROCAE ED-14F (RTCA DO-160F), RTCA DO-186B, RTCA DO-207 ED-12B (RTCA DO-178B)
Level B DO-254 Level C
FCC Identification TY91 VZI00882 , TY92 VZI00879
Applicable documents EUROCAE ED-23C, EUROCAE ED-67, EUROCAE ED-14F (RTCA DO-160F),
RTCA DO-186B, RTCA Software ED-12B (RTCA DO-178B) Level B Hardware DO-254 Level C
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
Audio Selector/Intercom
FAA TSO C139 EASA ETSO C139
Communications Transceiver
FAA TSO-C169a (PARTIAL) EASA ETSO 2C169A
Environmental Qualification DO-160G
A1C1BAESRXXXXXXZ B(XX)ABATTBXXA2E2 XXX
Operating Temperature Range:
-20º C to 55ºC , short term -40°C to +70°C
Altitude:
Up to 35,000 feet in an non-pressurized area
WEIGHT
PAR200A Unit
Rack with connectors
1.1 lb. (0..49 kg)
0.51 lb. (0.24 kg)
Dimensions
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth behind panel 7.15 in. (18.16 cm)
AUDIO PANEL POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
11-33 VDC (18-33 with TY92)
Maximum Current:
2.5 Amp (Externally protected by a 3A pull-type
breaker)

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 1-3 Rev. 4, DEC. 2017
Audio Selector Specifications
Audio selector panel input impedance:
510 
Input Isolation:
-60 dB (min.)
Receiver Inputs:
4 (Com 1, Com 2, Nav 1, Nav 2)
Unswitched Inputs:
4
Transmitter Selections:
3 (Com 1, Com 2,
Com1/2)
Headphone Impedance:
150 –1000 
Headphone Output:
38 mW each headset, no clipping <1% THD typical
into 150
Speaker Output (into 4 ) with no clipping
14 VDC:
28 VDC:
3 Watts (min.)
10 Watts (min.)
Microphone Impedance:
150 - 600 
Intercom Specifications
Intercom Positions:
4 places (with individual IntelliVox® circuits) (8 with
expansion, -0202 ONLY)
Music Inputs:
2, (Independent, Stereo)
Music Muting:
>-30 dB "Soft Mute" when Com or intercom active.
Distortion:
<1% THD @ 38 mW into 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
10 Hz –26 kHz
TY91L VHF Transceiver Specifications
Radio Type
Amplitude Modulation (AM) Aircraft Transceiver
Channels (Transmit & receive)
760 channels, 25KHz spacing
2280 channels, 8.33 kHz spacing
118.000 –136.992MHz
Frequency Selection
On PAR200A Audio Panel
Frequency Display
Alpha/numeric LCD display (with backlighting) on
PAR200A
Frequency control
PLL frequency synthesis, which is microprocessor
controlled Memory is store in non-volatile EPROM
Power consumption Receive (no signal)
Transmit
2.8W @ 14VDC
3.2A
Input Voltage
11-33 VDC 5A Circuit Breaker.
Power output
5 watts (nominal) VSWR Tolerance < 2:1 for best
operation (5:1 without damage)
Receiver sensitivity
-6dB SINAD @ 5µV (1KHz audio with 70% modu-
lation)
Data Interface
RS232
Headset volume output
Nominal 100 milliwatts output to 600 Ω
Temperature range
-20 to +70 degrees Celsius
Stability
< +/- 4.00 ppm
Dimensions
W-2.5” x H-1.9” x D6.3” (plus 1.5” for harness) W-
66mm xH-48mm x D-160 (plus 35mm for har-
ness)
Weight
.77 lbs.
.350 kg
FCC ID:
VZI00882

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 1-4 Rev. 4, DEC. 2017
TY92L VHF Transceiver Specifications
Radio Type
Amplitude Modulation (AM) Aircraft Transceiver
Channels (Transmit & receive)
760 channels, 25KHz spacing
2280 channels, 8.33 kHz spacing
118.000 –136.992MHz
Frequency Selection
On PAR200A Audio Panel
Frequency Display
Alpha/numeric LCD display (with backlighting) on
PAR200A
Frequency control
PLL frequency synthesis, which is microprocessor con-
trolled Memory is store in non-volatile EPROM
Power consumption Receive (no signal)
Transmit
2.8W @ 28VDC
80 W @ 28VDC, 3.2A
Input Voltage
18-33 VDC 5A Circuit Breaker. (28 V Systems only)
Power output
16 watts (nominal) VSWR Tolerance < 2:1 for best op-
eration (5:1 without damage)
Receiver sensitivity
-6dB SINAD @ 5µV (1KHz audio with 70% modula-
tion)
Data Interface
RS232
Headset volume output
Nominal 100 milliwatts output to 600 Ω
Temperature range
-20 to +70 degrees Celsius
Stability
< +/- 4.00 ppm
Dimensions
W-2.5” x H-1.9” x D6.3” (plus 1.5” for harness) W-
66mm xH-48mm x D-160 (plus 35mm for harness)
Weight
.77 lbs. (.350 kg)
FCC ID:
VZI00879
1.6 EQUIPMENT SUPPLIED
One ea. of the following items:
Model
Description
PS Part Number
Trig P/N
PAR200A
PAR200A Audio Panel with intercom and radio function control
050-228-0200
And ONE of the TY9X below
TY91(L)
VHF Communications Transceiver (6 watts)
050-228-8744
00882-00-05
TY92(L)
VHF Communications Transceiver (16 watts)
050-228-8745
01196-00-05
OR
PAR200A
PAR200A Audio Panel with intercom and radio function control
050-228-0202
And ONE of the TY9X below
TY91(L)
VHF Communications Transceiver (6 watts)
050-228-8744
00882-00-05
TY92(L)
VHF Communications Transceiver (16 watts)
050-228-8745
01196-00-05
Installation Kit: 250-890-0000, contains:
Description
Quantity
Part Number
PAR200A installation rack assembly
1
430-890-0040
PAR200A Rack back plate
1
430-890-0050
44-pin connector kit
2
120-891-2045-
Backshell, connector
2
625-025-2465
Backshell Retainer
2
431-891-0100
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 X 1/8 screw w/lock washer
2
475-440-0001
Solder Lug
2
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

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 1-5 Rev. 4, DEC. 2017
TY91/92 Installation Kit 250-228-0200, Containing:
Description
Quantity
Part Number
DB 25 Connector , Crimp type
1
425-025-0010
DB 25 Connector hood
1
625-025-0001
DB 25 Thumb Screws 4-40 x 1.94
2
475-002-0002
Crimp female sockets
25
425-020-5090
TNC Crimp Connector
1
425-400-1223
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 3 amp PULL TYPE REQUIRED for PAR200A
b. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for transceiver power (to TY91/92)
c. Headphone Jacks (up to 4 Stereo, as Required)
d. Microphone Jacks (up to 4 as Required)
e. Headphones, 150 (Stereo), up to 4 as required
f. Microphones, up to 4 as required
g. VHF Communication antenna 118-137 MHz, VSWR <2:1 (FAA-TSO approved is recommended)
h. Mounting hardware for TY91, as appropriate
i. Interconnect Wiring, coaxial cable (RG400 or RG142B or equivalent)
1.8 LICENSE REQUIREMENTS
In some localities other than the United States, an Aircraft Radio Station license may be required. In the
United States, you do not need a license to operate a two-way VHF radio aboard aircraft operating domesti-
cally. Aircraft operating domestically do not land in a foreign country or communicate via radio with foreign
ground stations. Flying in international or foreign airspace is permitted, so long as the previous conditions
are met. If you travel to a foreign destination, however, (e.g., Canada, Mexico, Bahamas, British Virgin
Islands) a license is required. Visit http://wireless.fcc.gov for more information.

PS Engineering Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 2-1 Rev. 4, DEC. 2017
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering PAR200A
Audio Selector Panel/Intercom/ with VHF communication radio controls.
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 PAR200A Intercom is FAA approved under TSO C139/ETSO C139 (Aircraft Audio Systems and Equip-
ment) and contains partial elements of TSO C169a/ETSO 2C169A (VHF Radio Communications Transceiver
Equipment Operating Within Radio Frequency Range 117.975 To 137.000 Megahertz).
The partial TSO applies to C169a, because the PAR200A unit provides control and display only for the
TY91-series of VHF communications equipment.
The conditions and tests for TSO approval of this article are minimum performance standards. Those
installing this article, on or in a specific type or class of aircraft, must determine that the aircraft instal-
lation conditions are within the TSO standards.
The article may be installed only following 14 CFR Part 43 or the applicable airworthiness require-
ments.
See FAA AC 20-41A for information regarding substitute TSO Aircraft Equipment.
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 acces-
sories 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 Engineer-
ing 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 PAR200A 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 PAR200A must be rigidly mounted to the instrument panel of the aircraft structure, within view and
reach of the pilot position(s). 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 Inc. ®
PAR200A Audio Selector Panel, COM radio Controller and Intercom System
Installation and Operator’s Manual
200-228-0200 Page 2-2 Rev. 4, DEC. 2017
2.3.3 Trig TY91/TY92 mounting requirements
The TY91/92 remote VHF Communications radio is mounted to the aircraft structure with 4 ea #6-32 (not
supplied) screws through the mounting flange. Guidance can be found in AC 43.13-2B, Chapter 2.
Figure 2-1 TY91/92 VHF Transceiver (Remote Mount)
2.3.4 Audio Panel Mounting Rack Installation
Remove the audio panel from the mounting tray by unscrewing the 3/32" hex-head screw that is in the center
of the unit. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit free of the tray. Set
the unit aside in a safe location until needed. Install the tray using six clip nuts (475-630-0002), and six FHP
6-32 x ½" screws (475-632-0012). The audio selector panel must be supported at front and rear of the mount-
ing tray.
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 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.
Custom factory wiring harnesses can be purchased from PS Engineering, call 865-988-9800 for details or
visit our website http://www.ps-engineering.com/downloads.shtml and click on Work Sheet for the appro-
priate product.
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 PAR200A 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 PAR200A 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 PAR200A was designed in a RFI hardened chassis and has internal Electromagnetic Interfer-
ence (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-