PS Engineering PMA5000EX User guide

9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
P
PM MA A5 50 00 00 0E EX X
Document P/N 200-550-0100
Rev. 3, December 2015
Audio Selector Panel with 4-Place IntelliVox® 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. 2015 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS
Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800
Martel Road, Lenoir City, TN 37772. Phone [phone], email [e-mail].
For use in Experimental/Non-certified aircraft ONLY
Not intended for installation in certified aircraft
The product warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
P
PM MA A5 50 00 00 0E EX X
Document P/N 200-550-0100
Rev. 3, December 2015
Audio Selector Panel with 4-Place IntelliVox® 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. 2015 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS
Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800
Martel Road, Lenoir City, TN 37772. Phone [phone], email [email protected].
For use in Experimental/Non-certified aircraft ONLY
Not intended for installation in certified aircraft
The product warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
P
PM MA A5 50 00 00 0E EX X
Document P/N 200-550-0100
Rev. 3, December 2015
Audio Selector Panel with 4-Place IntelliVox® 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. 2015 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS
Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800
Martel Road, Lenoir City, TN 37772. Phone [phone], email [e-mail].
For use in Experimental/Non-certified aircraft ONLY
Not intended for installation in certified aircraft
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 **NONE**....................................................................................................... 1-2
1.5 SPECIFICATIONS.......................................................................................................................... 1-2
1.6 EQUIPMENT SUPPLIED............................................................................................................... 1-3
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED ...................................................................... 1-3
1.8 OPTIONAL ITEMS......................................................................................................................... 1-3
1.9 LICENSE REQUIREMENTS......................................................................................................... 1-3
Section II - INSTALLATION ..................................................................................... 2-1
2.1 GENERAL INFORMATION.......................................................................................................... 2-1
2.1.1 SCOPE.............................................................................................................................. 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 ......................................................... 2-1
2.4 CABLE HARNESS WIRING ................................................................................................................. 2-2
2.4.1 NOISE................................................................................................................................ 2-2
2.4.2 POWER .............................................................................................................................. 2-3
2.4.3 COMMUNICATIONS PUSH-TO-TALK.................................................................................. 2-3
2.4.4 AUDIO PANEL INTERFACE ................................................................................................ 2-3
2.4.5 TEL (DUPLEX) FUNCTION FOR CELL PHONES.................................................................. 2-3
2.4.6 TRANSMIT INTERLOCK ..................................................................................................... 2-4
2.4.7 "SWAP" MODE .................................................................................................................. 2-4
2.4.8 BACKLIGHTING ................................................................................................................. 2-4
2.4.9 UNSWITCHED INPUTS........................................................................................................ 2-4
2.5 INTERCOM WIRING............................................................................................................................ 2-5
2.5.1 ENTERTAINMENT INPUTS.................................................................................................. 2-5
2.5.2 ENTERTAINMENT MUTING ................................................................................................ 2-5
2.5.3 ALTERNATE MUSIC DISTRIBUTION (J2 PIN 22)................................................................ 2-6
2.6 ADJUSTMENTS ................................................................................................................................... 2-6
2.6.1 MICROPHONE GAIN SELECTION ....................................................................................... 2-7
2.7 COMMUNICATIONS ANTENNA INSTALLATION NOTES ..................................................................... 2-7
2.8 PMA5000EX PIN ASSIGNMENTS ...................................................................................................... 2-8
2.9 POST INSTALLATION CHECKOUT ..................................................................................................... 2-9
2.10 UNIT INSTALLATION........................................................................................................................ 2-9
2.11 OPERATIONAL CHECKOUT ............................................................................................................. 2-9
2.11.1 AUDIO PANEL TEST ........................................................................................................ 2-9
2.11.2 TEL CHECKOUT.............................................................................................................. 2-9
2.12 FINAL INSPECTION ........................................................................................................................ 2-10
Section III OPERATION ............................................................................................. 3-1
3.1 SCOPE .............................................................................................................................................. 3-1
3.2 POWER ON-OFF EMG (1) .................................................................................................................. 3-1
3.3 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2).................................................................... 3-1
3.3.1 SPLIT MODE...................................................................................................................... 3-2

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page ii Rev. 3, Dec. 2015
3.3.2 COM RADIO MONITOR (3)................................................................................................ 3-2
3.3.3 SWAP MODE (SWITCH FROM COM 1TO COM 2REMOTELY) ............................................ 3-2
3.4 AUDIO SELECTOR (4) ........................................................................................................................ 3-2
3.5 TELEPHONE (TEL) (9) ...................................................................................................................... 3-3
3.5.1 CELL PHONE SIDETONE .................................................................................................... 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 MUSIC MUTING (6)............................................................................................................................ 3-5
3.7.1 MUSIC 2 MUTE CONTROL................................................................................................. 3-5
3.7.2 MUSIC IN PILOT ISO MODE............................................................................................... 3-5
3.7.3 ALTERNATE MUSIC DISTRIBUTION MODE ........................................................................ 3-5
3.8 MUSIC VOLUME (5) ........................................................................................................................... 3-6
3.9 TELEPHONE MODE (9) ...................................................................................................................... 3-6
3.9.1 CELLULAR TELEPHONE SIDETONE .................................................................................... 3-6
3.10 UTILITY JACK.................................................................................................................................. 3-6
3.10.1 CELLULAR PHONE........................................................................................................... 3-6
3.10.2 AUDIO ADVISORY INPUT ................................................................................................ 3-7
3.10.3 MUSIC INPUT .................................................................................................................. 3-7
3.10.4 ALTERNATE MUSIC DISTRIBUTION ................................................................................ 3-7
3.10.5 MUSIC 1 VOLUME ........................................................................................................... 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 – PMA5000EX Installation Drawings........................................................B
Appendix C – J1 Connector Interconnect .......................................................................C
Appendix D – J2 Connector Interconnect...................................................................... D
Rev
Date
Change
New
1/11/2010
New Release
1
1/11/2011
Improved installation of grounding lug
2
5/7/2015
Clarification of backlighting connections §2.4.8
3
12/11/15
Clarification of Alternate Music Distribution Operation §3.7.3 added

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 1-1 Rev. 3, Dec. 2015
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The PMA5000EX is designed to provide the basic audio control and intercom features most desire for the
Experimental / Light Sport Aircraft owner/pilot. Features like cellular telephone interface, music input with
custom muting schemes, and PS Engineering’s legendary IntelliVox® make this the perfect unit for many
light aircraft.
For use in Experimental/Non-certified aircraft ONLY
This unit is NOT INTENDED FOR INSTALLATION IN CERTIFIED AIRCRAFT
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 PMA5000EX.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA5000EX-
series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model
Description
Part Number
PMA5000EX
Stereo Audio Selector Panel with 4-place IntelliVox® Stereo
Intercom and utility jack.
050-550-0200
1.3 EQUIPMENT DESCRIPTION
The PMA5000EX is a state-of-the-art audio isolation amplifier and audio selector that contains a 4-place
automatic voice activated (VOX) intercom system. It can switch two transceivers (Com 1, Com 2) and five
navigation receivers (Nav 1, Nav 2, AUX 1, AUX 2 and DME). Pushbuttons select the receiver audio
source provided to the headphones (DME is paired with AUX 2).
A full duplex TEL mode allows the PMA5000EX to act as an audio interface between aircraft headphone
and microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment, through the
front mounted jack.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PMA5000EX must be interfaced with an approved system.
There are five unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar altim e-
ter warning, with the fifth unswitched input through a front-mounted utility jack, when configured to act as
a fifth unswitched input.
Pushbutton switches select one of the communication transceivers for the pilot and copilot position, and
allows radio transmission. In "Split Mode,” the PMA5000EX 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 mi-
crophone 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 voice activated (VOX) intercom is included in the PMA5000EX. This system has PS Engi-
neering’s patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incorpo-
rates pilot isolate, all and crew modes, two independent stereo music inpu ts with "SoftMute™". Intercom
volume control is through two concentric front panel knobs and a pushbutton intercom mode switch. The
small volume knob controls the intercom level for the pilot and copilot, while the large knob controls the
passenger intercom volume. Intercom squelch is automatic.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 1-2 Rev. 3, Dec. 2015
1.4 APPROVAL BASIS **None**
The PMA5000EX is NOT INTENDED OR APPROVED for installation or use in a certified aircraft.
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 oper a-
tion.
1.5 SPECIFICATIONS
WEIGHT
PMA5000EX 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 break-
er)
Audio Selector Specifications
Audio selector panel input impedance:
510 
Input Isolation:
-60 dB (min.)
Receiver Inputs:
6 (Com 1, Com 2, TEL, AUX 1, AUX 2, DME)
Unswitched Inputs:
5 (including front jack)
Transmitter Selections:
4 (Com 1, Com 2, TEL
Com1/2)
Headphone Impedance:
150 – 1000 
Headphone Output:
38 mW each headset, no clipping <1% THD typical
Microphone Impedance:
150 - 600 
Intercom Specifications
Intercom Positions:
4 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 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
10 Hz – 26 kHz

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 1-3 Rev. 3, Dec. 2015
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model
Description
Part Number
PMA5000EX
PMA5000EX Audio Panel with Stereo intercom.
050-550-0200
PMA5000EX Installation Kit: 250-890-0000
Description
Quantity
Part
Number
Installation rack assembly
1
430-890-0040
Rack back plate
1
430-890-0050
44-pin connector kit
2
120-891-2045
Backshell, connector
2
625-025-2465
Backshell Retainer
2
431-881-0100
4 40 X 7/16 screw w/nylon patch
4
475-440-0007
4 40 X 3/8 screw w/nylon patch
4
475-440-1038
4-40 x ¼” screw with 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
Parts ID Sheet
1
002-890-0404
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA5000EX
b. Headphone Jacks (Stereo, as Required)
c. Microphone Jacks (as Required)
d. Headphones, 150 (Stereo), up to 6 as required
e. Microphones, up to 4 as required
f. Interconnect Wiring (contact PS Engineering for more information on custom wiring harnesses).
1.8 OPTIONAL ITEMS
a. Cell Phone Patch Cord, 2.5mm to 2.5mm, PS Part Number 425-006-7026
b. Music Patch Cord, 3.5mm to 5.5mm, PS Part Number 425-006-2535
c. Phone patch cord for iPhone or Blackberry 3.5 mm 4-conductor to 2.5 mm
(Phone only, no music) 425-006-0354
1.9 LICENSE REQUIREMENTS
None

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-1 Rev. 3, Dec. 2015
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering
PMA5000EX Audio Selector Panel/Intercom.
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 as required by 14 CFR 65.81
(b).
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. If any claim is to be made, save the shipping material and co n-
tact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accesso-
ries 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 Eng i-
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 PMA5000EX 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 ad e-
quate cooling air provided.
2.3.2 Mounting Requirements
The PMA5000EX must be rigidly mounted to the instrument panel of the aircraft structure, within view and
reach of the pilot position(s). Installation should comply with FAA Advisory Circular AC 43.13-2B. 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 cu r-
rent 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 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 PMA5000EX. The connectors are a sub-
miniature crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The connectors
are mounted to the tray back plate with #4-40 screws (475-440-1038), from the inside of the tray and the
mounting block, 431-891-0100. Ensure that proper strain relief and chafing precautions are made during
wiring and installation, using the cable clamp (625-001-0002).

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-2 Rev. 3, Dec. 2015
Two grounding lugs are provided, which may be attached to the rear mounting plate with 2 ea #4 -40 x ¼”
screws with captivated lock washers. These provide a convenient location to connect the shield ground
terminations.
Manufacturer
Crimping Tool
Positioner
Extraction tool
AMP
601966-1
601966-6
91067-1
Daniels
AFM8
K42
M24308-1
ITT-Cannon
995-0001-584
995-0001-739
91067-1
Table 2-1 Connector Pin crimping tools
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. Two- and three-conductor shielded wire must
be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and
soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2B for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper installation will
void the PS Engineering warranty.
2.4.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA5000EX 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 t-
or, J2 pins 8 & 9, of the PMA5000EX 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 PMA5000EX was designed in a RFI hardened chassis and has internal Electro-
magnetic 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 ai r-
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.
Radiated signals can be a factor when low level microphone signals are "bundled" with curre nt carrying
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
2.4.1.1 Music Inputs and Noise
PMA5000EX units utilize a differential input to help prevent noise from entering the music system. This
feature is usually transparent to the installer, however, it is important that the appropriate music signal and
ground connections are made directly to the dedicated music signa l and ground inputs on the PMA5000EX.
The power for IFE and audio panel should be a common bus.
If a music jack instead of a music source is installed for Music 1 or 2, we recommend grounding the jack to
airframe ground.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-3 Rev. 3, Dec. 2015
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 Power
The PMA5000EX is compatible with both 14 and 28 Volt DC systems. A five (5) Amp circuit breaker is
required for all installations. Power and ground wires should be #22 connected to J2 Pins 8 and 9. Connect
airframe ground to J2 Pin 10 and 11 only. No dropping resistors are required.
2.4.3 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 r a-
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 PMA5000EX 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.
2.4.4 Audio Panel interface
The PMA5000EX is designed to interface with standard aircraft avionics, and presents a 510receiver
impedance. For best results, a twisted-shielded cable is recommended from the avionics audio source to the
audio panel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one condu c-
tor of the twisted-shielded cable.
2.4.5 TEL (Duplex) Function for Cell Phones
The TEL mode in the PMA5000EX is compatible with many cellular telephones with hands-free headset
interfaces. The front panel 3/32” utility jack can be used as the interface to the Cell Phone, or a 3/32” jack
can be installed somewhere on the aircraft panel. The wired interface jack is connected with the
PMA5000EX as shown: A patch cord (3/32” to 3/32”) is available from PS Engineering under P/N 425 -
006-7026.
3/32" Cellular Jack
COM 3 Mic Input
Com 3 Audio
Audio Lo
3
5
4
PMA5000EX
J1
Cellular Plug (typical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
This is a typical interconnect
PS Engineering does not guarantee
compatability in all cases.
Cellular Phone
Interconnect

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-4 Rev. 3, Dec. 2015
Figure 2-1 Cellular telephone interface for rear connector, if an additional jack is desired
2.4.5.1 Cell phone Sidetone
As shipped from PS Engineering, the PMA5000EX does NOT provide cellular telephone sidetone (the us-
er’s voice fed back to the headset). Some cell phones do not provide sidetone. In PMA5000EX, telephone
sidetone can be enabled by holding the TEL button for more than one second. This setting will be remem-
bered when the power is off.
NOTE
Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement a c-
tion, which may include a $10,000 fine per incident. PS Engineering, Inc. does not endorse using una p-
proved cellular telephone equipment in flight, and takes no responsibility for the user’s action.
PS Engineering does not guarantee compatibility with personal cellular telephones. For a list of phones that
have been tested, visit www.ps-engineering.com.
2.4.6 Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature,
this function must be disabled. Consult that manufacturer's installation manual.
2.4.7 "Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground (or J2-pin 21), the user can switch between Com 1 and 2 by depressing this switch
without having to turn the mic selector switch. This yoke-mounted switch eliminates the need to remove
your hands from the yoke to change transceivers. The transfer of TX indication from Com 1 to Com 2
shows that the swap has been initiated; there is no dedicated swap indicator.
2.4.8 Backlighting
The PMA5000EX has an automatic dimming of the pushbutton annunciation LEDs controlled by a phot o-
cell. Control of the unit white text backlighting is through the aircraft avionics dimmer For 14 V aircraft,
connect J2 Pins 6 and 7 to the aircraft dimmer bus, and pin 5 to ground. For 28-volt systems, connect pin 7
to the aircraft dimmer, and pins 5 and 6 to ground.
If an external dimmer control is not used, a constant back light illumination can be established for
nighttime viewing. Pin 6 or 7 (depending on system voltage) must be tied to power (J2, pin 8 or 9) for the
back lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity
of the push-button annunciator LEDs.
2.4.9 Unswitched inputs
J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3 and 4, respe c-
tively. These inputs are presented to the pilot and copilot regardless of the audio configuration, and will
always mute the entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, GPS way-
point audio, autopilot disconnect tones, or any other critical audio signal. Unswitched #1 is always presen t-
ed to the to the crew headphones, and is available to the pilot in fail-safe (off) mode. Unswitched 3 and 4
inputs are always presented to the crew headphones.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
Gain
1
Yes
Yes
1:1(fixed)
2
No
Yes
1:1(fixed)
3
No
Yes
Adjustable
4
No
Yes
1:1(fixed)
5 (jack)
No
Yes
1:1(fixed)
Table 2-2 Unswitched input table
Unswitched #2, J1 pin 44 is unswitched is always connected to the Pilot’s headphone.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-5 Rev. 3, Dec. 2015
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient a udio low. However, this
should NOT be connected to Music Low.
Unswitched #1 is presented to the pilot headphone in fail-safe (off) mode.
NOTE
Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 has a variable adjustment control located on the bottom side of the unit. This control allows
you to adjust the volume level of that unswitched input. Refer to Adjustments section.
The front panel jack can be configured to act as a fifth unswitched input. When connected to an audio alert
source, the input to this jack will be presented to the pilot and copilot headset s, and not muted.
NOTE
The front-mounted utility jack is intended for portable equipment that is advisory in nature. It is NOT
INTENDED for use as a primary warning channel. Audio of importance MUST ALWAYS be hard -wired
into the unswitched inputs of the audio panel.
2.5 Intercom wiring
See Appendix C and D for intercom connection configurations. It is critical to the proper operation of this
system to have this connector wiring made in accordance with these diagrams. Use 2 - and 3-conductor,
MIL-spec cable as shown. Connect the shields at the audio panel end only, and tie to the audio low inputs
as shown.
NOTE
The intercom harness can be custom made by PS Engineering, Inc. Simply call the factory or www.ps-
engineering.com to obtain a wire harness work sheet. The harness will be made to your specifications and
fully functionally tested. Harness can be ordered with jack, or without the intercom jacks installed, for easi-
er wire routing through the aircraft.
2.5.1 Entertainment Inputs
The PMA5000EX has two INDEPENDENT music inputs, PLUS a front mounted jack that is connected to
Entertainment 1. Entertainment input number 1 is J2 pins 23 (left channel) and 24 (right channel), with
respect to pin 25, and Entertainment number 2 is connected to 26 (left channel), 27 (right channel), with
respect to 28.
NO TE
Use t he lo w le ve l o utp u t of a ny add it io na l ente rt ai nmen t de vi ce to co n ne ct to t he a u -
dio p anel. Ma xi mu m si gnal l evel i s 3 VA C p -p. DO NOT us e a speake r -level o utp u t,
thi s will c ause i nter na l da ma ge in th e audio pa nel.
2.5.2 Entertainment muting
The PMA5000EX-system incorporates a "Soft Mute™" system. This will mute the enterta inment devices
during ICS or radio conversation. See Section 3.7 for more information.
Any signal appearing in the hard wired unswitched audio inputs will always mute the entertainment
sources, even though the passengers may not hear the audio tone itself.
Press the Mute switch to activate the four Karaoke modes (disabling crew SoftMute™). This allows the
pilot to place the entertainment into the background while having the radios in the foreground. This elim i-
nates the constant interruption of the music while still having the radios a priority.
CAUTION
Local oscillators and internal signals from entertainment equipment can cause undesired interference with
other aircraft systems. Before takeoff, operate the entertainment devices to determine if there is any adverse
effect within the aircraft systems. If any unusual operation is noted in flight, immediately switch off the
entertainment devices.
All additional entertainment devices must be switched off for both takeoff and landing.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-6 Rev. 3, Dec. 2015
2.5.2.1 Entertainment 2 Mute (J2 Pin 13 & 14)
Connecting J2 pin 13 to pin 14 (or ground) through a SPST switch places the entertainment #2 music
source into the Karaoke Mode. In this mode, incoming music and intercom conversation will not mute the
music for the passengers’ intercom net. This allows uninterrupted music during casual conversation an d at
times when radio communications are of lesser importance.
2.5.3 Alternate Music Distribution (J2 Pin 22)
The two music inputs can be configured in the PMA5000EX. There are two configurations available, inde-
pendent, or ICS mode dependent.
If the inputs are independent, Input #1 (and the front jack) is provided to the pilot and copilot. Muting
modes (SoftMute™) are controlled by the front panel “mute” button.
If the unit is configured for Alternate Music Distribution, the music inputs are intercom mode dependent;
input 1 goes to the pilot, copilot and all passengers when the intercom is in the “ALL” mode. Music 2 is
ONLY active in CREW mode, and then provided only to the passengers. The passenger SoftMute™ co n-
trol becomes active in CREW.
To enable the alternate music distribution mode, J2, Pin 22 is connected to aircraft ground, either directly,
or through a toggle switch, if control over this mode is desired.
2.6 Adjustments
The PMA5000EX is factory adjusted to accommodate the typical requirements for most aircraft configura-
tions. The Telephone volume control is accessible through the top cover (figure 2-2).
The Unswitched #3 volume control is reached by removing the bottom cover, and is shown in Figure 2 -3.
TEL volume, turn adjustment Clockwise to increase the incoming telephone audio.
Unswitched Input 3 Volume adjustment. (Bottom cover must be removed).
Figure 2-2- PMA5000EX Adjustments, top cover
Front
of unit
NOTE:
If top cover is removed
for ANY reason, you
MUST replace the cover
screws with the proper
length, otherwise damage
will result.
Shorter Screw

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-7 Rev. 3, Dec. 2015
Figure 2-3 – Unswitched 3 Audio Level (bottom cover removed)
2.6.1 Microphone Gain Selection
In very high noise environments (such as open cockpit, etc.) the PMA5000EX can be switched to a lower
microphone gain by configuring internal switches. Contact PS Engineering for more information.
2.7 Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communicat ions antenna is locat-
ed on top of the aircraft while the other communications antenna is installed on the bottom. Any antenna
relocation should be accomplished in accordance with AC 43.13-2B, and /or aircraft manufacturers’ rec-
ommendations.
WARNING
It is probable that radio interference will occur in the split mode when the frequencies of the two ai r-
craft radios are adjacent, and/or the antennas are physically close together. PS Engineering makes no
expressed or implied warranties regarding the suitability of the PMA5000EX in Split Mode.
PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-7 Rev. 3, Dec. 2015
Figure 2-3 – Unswitched 3 Audio Level (bottom cover removed)
2.6.1 Microphone Gain Selection
In very high noise environments (such as open cockpit, etc.) the PMA5000EX can be switched to a lower
microphone gain by configuring internal switches. Contact PS Engineering for more information.
2.7 Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communicat ions antenna is locat-
ed on top of the aircraft while the other communications antenna is installed on the bottom. Any antenna
relocation should be accomplished in accordance with AC 43.13-2B, and /or aircraft manufacturers’ rec-
ommendations.
WARNING
It is probable that radio interference will occur in the split mode when the frequencies of the two ai r-
craft radios are adjacent, and/or the antennas are physically close together. PS Engineering makes no
expressed or implied warranties regarding the suitability of the PMA5000EX in Split Mode.
PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-7 Rev. 3, Dec. 2015
Figure 2-3 – Unswitched 3 Audio Level (bottom cover removed)
2.6.1 Microphone Gain Selection
In very high noise environments (such as open cockpit, etc.) the PMA5000EX can be switched to a lower
microphone gain by configuring internal switches. Contact PS Engineering for more information.
2.7 Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communicat ions antenna is locat-
ed on top of the aircraft while the other communications antenna is installed on the bottom. Any antenna
relocation should be accomplished in accordance with AC 43.13-2B, and /or aircraft manufacturers’ rec-
ommendations.
WARNING
It is probable that radio interference will occur in the split mode when the frequencies of the two ai r-
craft radios are adjacent, and/or the antennas are physically close together. PS Engineering makes no
expressed or implied warranties regarding the suitability of the PMA5000EX in Split Mode.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-8 Rev. 3, Dec. 2015
2.8 PMA5000EX Pin assignments
J1
Function
J2
Function
1
No Connect
1
Pilot Phones Lo
2
No Connect
2
Copilot Phones Lo
3
TEL Audio in
3
Copilot Phones (L)
4
TEL Audio Lo
4
Copilot Phones (R)
5
TEL Mic Audio
5
Lights lo
6
No Connect
6
14/28 V Lights
7
AUX 1 Audio In
7
14/28 V Lights
8
AUX 1 Audio Lo
8
Aircraft Power
9
Com 1 Audio
9
Aircraft Power
10
Com 1 Audio Lo
10
Aircraft Ground
11
Com 1 Mic
11
Aircraft Ground
12
Com 1 Mic Key
12
No Connect
13
Com 2 Audio
13
Music 2 Mute Inhibit
14
Com 2 Audio Lo
14
Music 2 Mute Inhibit Lo
15
Com 2 Mic
15
Unswitched #4
16
No connect
16
Pilot Phones (L)
17
Nav 1 Audio
17
no connect
18
Nav 1 Audio Lo
18
no connect
19
Nav 2 Audio
19
no connect
20
Nav 2 Audio Lo
20
Swap
21
DME Audio*
21
Swap Lo
22
DME Audio Lo
22
Alternate Music Distribution control
23
AUX 2 Audio Hi*
23
Music 1 (L)
24
No Connect
24
Music 1 (R)
25
No Connect
25
Music 1 Lo
26
No Connect
26
Music 2 (L)
27
No Connect
27
Music 2 (R)
28
No Connect
28
Music 2 Lo
29
Unswitched #3
29
No Connect
30
Com 2 Mic Key
30
No Connect
31
Unswitched Audio 1
31
Pilot Phones (Rt)
32
Unswitched Lo
32
Copilot Mic Audio
33
Pilot Mic Audio
33
Copilot Mic PTT
34
Pilot Mic PTT
34
Copilot Mic Lo
35
Pilot Mic Lo
35
Pass 1 Mic Audio
36
No Connect
36
Pass 1 Mic Audio Lo
37
No Connect
37
Pass 2 Mic Audio
38
No Connect
38
Pass 2 Mic Audio Lo
39
No Connect
39
No Connect
40
Pass HP (L)
40
No Connect
41
Pass HP (R)
41
No Connect
42
Pass HP Lo
42
No Connect
43
Unswitched 2 Lo
43
No Connect
44
Unswitched 2 Audio
44
No Connect
DME and
AUX 2 are
controlled by
the AUX 2
button

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-9 Rev. 3, Dec. 2015
2.9 Post Installation Checkout
After wiring is complete, verify power is ONLY on pins 8 and 9 of the J2 and airframe ground on J2 con-
nector pins 10 and 11. Failure to do so will cause serious internal damage and void PS Engineering's wa r-
ranty.
2.10 Unit Installation
To install the PMA5000EX, gently slide the unit into the mounting rack until the hold -down screw is en-
gaged. While applying gentle pressure to the face of the unit, tighten the 3/32" hex-head in the center of the
unit until it is secure. DO NOT OVER TIGHTEN.
CAUTION
Apply steady pressure to the bezel while screwing the unit into the tray to ensure even seating of the unit
and connectors.
WARNING
Do not over-tighten the lock down screw while installing the unit in tray. Internal damage will result.
2.11 Operational Checkout
2.11.1 Audio Panel Test
NOTE
The IntelliVox® is designed for ambient noise levels of 80 dB or above. Therefore some clipping may o c-
cur in a quiet cabin, such as without the engine running, in a hangar. This is normal.
1. Apply power to the aircraft and avionics.
2. Plug headsets into the pilot, copilot, and occupied passenger positions.
3. Verify fail-safe operation by receiving and transmitting on com 1 from the pilot position, with the au-
dio panel power off. The Com audio will be present in one ear cup only.
4. Switch on the unit by pressing the volume (VOL) knob.
5. Check intercom operation.
6. Push the Com 1 Xmt select button (lower row).
7. Verify that both of the Com 1 buttons light. Verify that transmit button LED (Light Emitting Diode)
near the mic selector is not blinking. If the LED is blinking, stop testing and troubleshoot the micro-
phone PTT installation.
8. Verify proper transmit and receive operation from the copilot position, noting that the copilot PTT
switch allows proper transmission on the selected transceiver. Verify that the Com 1 Xmt button blinks
when transmitting.
9. Verify that pushing the COM 2button causes the button to illuminate, and the Com 2 receiver to be
heard. Verify operation on Com 1 from the pilot position.
10. Repeat for Com 2
11. Press and hold the Com 1 Xmt button. While holding the Com 1 button, press the Com 2 Xmt button.
This places the unit in “split Mode;” Verify that the pilot can transmit and receive on Com 1, while the
copilot transmits and receives on Com 2.
12. Verify proper operation of all receiver sources by selecting them using the appropriate button. The
button illuminates to show which source is in use.
13. Verify that the appropriate LED in the lower button row blinks when either push to talk is keyed.
14. Verify proper Intercom system operation in the ALL, ISO and CREW modes (see Table 3-1).
15. Verify that the audio selector panel system does not adversely affect any other aircraft syste m by sys-
tematically switching the unit on and off, while monitoring the other avionics and electrical equipment
on the aircraft.
2.11.2 TEL Checkout
Press the TEL button. Verify that the pilot headset is connected to the cellular telephone system (if i n-
stalled). Verify that by using the pilot side PTT, the pilot can transmit on the other selected radio (Com 1 or

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-10 Rev. 3, Dec. 2015
Com 2). The telephone function will allow any person heard by the pilot on the intercom, also heard on the
telephone.
2.12 Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation interferes with ai r-
craft control operation. Move all controls through their full range while examining the installation to see
that no mechanical interference exists. Verify that the cables are secured to the aircraft structure in accord-
ance with good practices, with adequate strain relief. Ensure that there are no kinks or sharp bends in the
cables and coaxial cables. Verify that the cables are not exposed to any sharp edges or rough sur faces, and
that all contact points are protected from abrasion.
Complete any documentation that may be required, such as a logbook entry, weight and balance comput a-
tion and place the supplied Pilot’s Guide in the aircraft. Return completed warranty registration application
to PS Engineering, or complete online at www.ps-engineering.com.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 3-1 Rev. 3, Dec. 2015
Section III OPERATION
3.1 SCOPE
This section provides detailed operating instructions for the PS Engineering PMA5000EX, Audio Selector
Panel/Intercom Systems. Please read it carefully before using the equipment so that you can take full a d-
vantage of its capabilities.
This section is divided into sections covering the basic operating areas of the PMA5000EX systems. They
are Communications Transceiver Selection, Audio Selector, Intercom special functions.
Figure 3-1 PMA5000EX Operating Controls
3.2 Power on-off EMG (1)
Unit power is turned on and off by pushing the volume knob. In the OFF or "EMG" position, the pilot head-
set is connected directly to Com 1 as well as unswitched input #1. This allows communication capability
regardless of unit condition. Any time power is removed or turned OFF, the audio selector will revert to fail-
safe mode.
The power switch controls all audio selector panel functions, and intercom. All pushbutton selections and
function modes will be remembered and return to the last state when turned on.
3.3 Communications Transmit (XMT) Selection (2)
There are two pushbuttons associated with the communications transceiver selection. The two lower but-
tons (# 2) control which transceiver is selected for transmit. The top row of pushbuttons (# 3) allows sele c-
tion of the receiver audio. Push the lower button to select the desired COM transmitter.
The PMA5000EX-Series has an automatic selector system. Audio from the selected transceiver is automa t-
ically heard in the headsets. You can check this function by switching from COM 1 transmitter to Com 2
transmitter by pressing the COM 2 transmitter selector pushbutton. See that the associated Com 2 receive
pushbutton indicator light that is located immediately above the Com 2 transmitter pushbutton turns green.
This guarantees that the pilot will always hear the audio from the transceiver selected for transmit.
The PMA5000EX “remembers” the receiver selection, so that when switching transmitters from COM 1 to
COM 2, if COM 2 audio was previously selected, COM 1 audio will continue to be heard. This eliminates the
pilot having to switch Com 1 audio back on, after changing transmitters.
When switching from COM 1 to COM 2 while Com 2 was not previously selected, COM 1 audio will be
switched off. In essence, switching the mic selector will not override prior selecti on of COM receiver au-

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 3-2 Rev. 3, Dec. 2015
dio.
In normal (not split) modes, the PMA5000EX gives priority to the pilot’s radio Push-To-Talk (PTT). If the
copilot it transmitting, and the pilot presses his PTT, the pilot’s microphone will be heard over the selected
com transmitter.
In TEL mode, the pilot microphone and headphones are connected to the cell phone. The pilot PTT will
switch the pilot mic to the selected com transceiver, and allow continued aircraft communications to co n-
tinue. (See Section 3.4 —TEL—for more details)
The copilot will also be able to transmit on the other selected radio with his PTT as well.
3.3.1 Split Mode
The split mode can be activated at any time by pressing the COM 1and COM 2 XMT buttons at the same
time. This places the pilot on COM 1 and the Copilot on COM 2.
Pilot on COM 2 and Copilot on COM 1 is not possible.
NO TE
Due to the nature of VHF communications signals, and the size constraints in general aviation aircraft, it is
probable that there will be some bleed-over in the Split mode, particularly on adjacent frequencies. PS
Engineering makes no warranty about the suitability of Split Mode in all aircraft conditions.
When the split mode is activated, the intercom between the pilot and copilot is inhibited, although the pa s-
sengers can still talk among themselves. The crew intercom can be reactivated if desired by pressing the
“Mute” button.
The indicator LED in the Mute mode indicator will show ON when the intercom between pilot and copilot
is off (muted), and turn off to indicate that the intercom is not muted, and the crew can speak to each other.
The passengers will be able to converse normally.
3.3.2 COM Radio Monitor (3)
The PMA5000EX has a Monitor function that allows you to listen (monitor) to a communication receiver
but when the other primary receiver becomes active, the audio from the monitored radio is turned off while
the other radio is active.
For example, if COM 1 has been selected for transmit (XMT button pushed, both indicators on), it has been
set as the primary radio. COM 2 can be selected to receive by pushing the COM 2 RCV button, and be-
cause it is NOT selected for transmitting, it is set as secondary. You will hear both receivers in your headset
at the same time. When the MON button is pressed (and the LED indicator is on), COM 2 will be turned off
while COM 1 receives.
This way, you can listen to AWOS on COM 2, but when ATC calls on COM 1, the weather audio is cut out
while ATC is speaking.
3.3.3 Swap Mode (Switch from Com 1 to Com 2 remotely)
With a yoke mounted, normally open momentary switch, the pilot can change from the current Com trans-
ceiver to the other by depressing this switch. To cancel "Swap Mode," the pilot may either press the yoke
mounted switch again, or select a different Com with the XMT buttons.
3.4 Audio Selector (4)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associa t-
ed RCV button. You will always hear the audio from the selected transceiver.
Navigation receiver audio is selected through four momentary, push-button, backlit switches.
The users can identify which receivers are selected by noting which green switch LEDs are lit. Navigation
aid audio push buttons are labeled Nav 1,Nav 2,Aux 1 and Aux 2. DME audio (if present) will come
through when the AUX 2 button is selected. When one of these buttons is pressed, the mode is active, and
the LED will illuminate. Press the switch again and it will be "off" and remove that receiver from the audio
output.
In SPLIT mode, only the pilot will hear selected navigation audio.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 3-3 Rev. 3, Dec. 2015
3.5 Telephone (TEL) (9)
The TEL mode serves as a full duplex interface and distribution for telephone systems such as AirCell or
portable cellular phones with earpiece jacks. Pressing the TEL button activates the telephone mode.
This connects the telephone to the users as follows:
In ALL intercom mode, all crew and passengers will be heard on the phone when they speak. Com and
other selected radio audio is also heard in the headsets. If the pilot or copilot pushes the radio PTT, their
mic will be transferred to the selected Com radio. The telephone party will not hear ATC communications,
and vice versa.
In CREW mode, only the pilot and copilot are connected to the telephone. Passengers will not hear the
telephone. The pilot and copilot will also have transmit capabilit y on the other selected transceiver.
In ISO intercom mode, when the PMA5000EX is in the TEL mode, the pilot position is in the "Phone
Booth." Only the pilot will hear the telephone, and only he will be heard. He will also have access to Com 1
or 2, and will transmit on that radio using the PTT. All selected audio is provided to the pilot.
NOTE
Because the cell-phone uses an intercom circuit, all stations on that circuit will lose intercom capability
when the cell phone is in use.
3.5.1 Cell phone Sidetone
As shipped from PS Engineering, the PMA5000EX does NOT provide cellular telephone sidetone (the us-
er’s voice fed back to the headset). Some cell phones do not provide sidetone. In PMA5000EX, Telephone
sidetone can be enabled by holding the TEL button for more than one second.
3.6 Intercom Operation
3.6.1 IntelliVox® VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. There is no field adjustment. Through three
individual signal processors, the ambient noise appearing in all six microphones is consta ntly being sam-
pled. Non-voice signals are blocked. When someone speaks, only their microphone circuit opens, placing
their voice on the intercom.
The system is designed to block continuous tones; therefore people humming or whistling in monotone
may be blocked after a few moments.
For consistent performance, any headset microphone must be placed within ¼-inch of your lips, preferably
against them. (ref: RTCA/DO-214, 1.3.1.1 (a)).
NOTE
It is also a good idea to keep the microphone out of a direct wind path. Moving your head through a vent air
stream may cause the IntelliVox® to open momentarily. This is normal.
The IntelliVox® is designed to work with normal aircraft cabin noise levels (70 dB and above). It loves
airplane noise! Therefore, it may not recognize speech and clip syllables in a quiet cabin, such as in the
hangar, or without the engine running. This is normal.
For optimum microphone performance, PS Engineering recommends installation of a Microphone Muff Kit
from Oregon Aero (1-800-888-6910). This will not only optimize VOX performance, but will improve the
overall clarity of all your communications.

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 3-4 Rev. 3, Dec. 2015
Table 3-1 Mic Muff ™ Part Numbers
Manufacturer
Model
Mic Muff™ Part Number
Bose
Dynamic
Electret
M87 Dynamic
90010
90015
90020
David Clark
H10-30
H10-20, H10-40
H10-13.4
90010
90015
90015
Lightspeed
All
90015
Peltor
7003
7004
90010
90015
Pilot
11-20 & 11-90
90015
Sennheiser
90015
Telex
Airman 750, Echelon
AIR3000
90015
90010
3.6.2 Intercom Volume Control (7)
The inner volume control knob adjusts the loudness of the intercom for the pilot and copilot. It has no e f-
fect on selected radio levels, music input levels or passengers' volume level.
The outer volume control knob controls intercom volume or the passengers. It has no effect on radio or
music levels.
Adjust the radios and intercom volume for a comfortable listening level. Most general aviation headsets
today have built-in volume controls; therefore, volume also can be further adjusted at the indivi dual head-
set.
3.6.2.1 Mono headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets. All passenger headsets are connected in
parallel. Therefore, if a monaural headset is plugged in to a PMA5000EX Stereo installation, one channel
will be shorted. Although no damage to the unit will occur, all passengers with stereo headsets will not hear
one channel, unless they switch to the “MONO” mode on their headset.
3.6.3 Intercom Modes (8)
The “ICS” pushbutton switch on the left side of the panel provides the selection of the three intercom
modes. The description of the intercom mode function is valid only when the unit is not in the "Split"
mode. Then, the pilot and copilot intercom is controlled with the Mute button.
This button cycles through the intercom modes, from top to bottom, then bottom to top as: ISO, ALL Crew
and Crew, ALL, ISO. An LED shows which mode is currently active.
ISO:The pilot is isolated from the intercom and is connected only to the aircraft radio system. He will hear
the aircraft radio reception (and sidetone during radio transmissions). Copilot will hear passengers’ inte r-
com and entertainment, while passengers will hear copilot intercom and their entertainment source. Neither
copilot or passengers will hear aircraft radio receptions or pilot transmissions. The pilot can hear music if
desired. See §3.7.2
ALL:All parties will hear the aircraft radio and intercom. Crew and passengers will hear selected ente r-
tainment. During any radio or intercom communications, the music is muted. The music volume increases
gradually back to the original level after communications have been completed.
CREW: Pilot and copilot are connected on one intercom channel and have exclusive access to the aircraft
radios. They may also listen to Entertainment 1. Passengers can continue to communicate with themselves
without interrupting the Crew and may listen to entertainment as configured.