9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
Document P/N 200-450-0000
Revision 3, November 2014
Audio Selector Panel with Marker Beacon Receiver
High-fidelity Stereo Intercom, USB Charging Port
System Installation and Operation Manual
FAA- TSO C139a, C35d, C71
Patented under one or more of the following;
No. 4,941,187; 5,903,227; 6,160,496 and 6,493,450, 7,391,877
PS Engineering, Inc. 2014 ©
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 (865) 988-9800, email contact@ps-engineering.com.
In certified aircraft, warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
P
M
P
A445500
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Table of Contents
Section I – GENERAL INFORMATION...............................1-1
1.1 INTRODUCTION............................................................................................................................ 1-1
1.2 SCOPE .............................................................................................................................................. 1-1
1.3 EQUIPMENT DESCRIPTION....................................................................................................... 1-1
1.4 APPROVAL BASIS......................................................................................................................... 1-2
1.1.1 LIMITATIONS..................................................................................................................... 1-2
1.5 SPECIFICATIONS.......................................................................................................................... 1-2
1.6 EQUIPMENT SUPPLIED............................................................................................................... 1-3
1.7 EQUIPMENT REQUIRED BUTNOT SUPPLIED......................................................................1-4
1.8 LICENSE REQUIREMENTS......................................................................................................... 1-4
Section II - INSTALLATION ........................................2-1
2.1 GENERAL INFORMATION..........................................................................................................2-1
2.1.1 SCOPE.............................................................................................................................. 2-1
2.1.2 CERTIFICATION REQUIREMENTS ...................................................................................... 2-1
2.2 UNPACKING AND PRELIMINARY INSPECTION ..................................................................................2-1
2.3 EQUIPMENT INSTALLATION PROCEDURES....................................................................................... 2-1
2.3.1 COOLING REQUIREMENTS ................................................................................................ 2-1
2.3.2 MOUNTING REQUIREMENTS ............................................................................................. 2-1
2.3.3 AUDIO PANEL MOUNTING RACK INSTALLATION............................................................. 2-2
2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY ......................................................... 2-2
2.4 CABLE HARNESS WIRING ................................................................................................................. 2-2
2.4.1 ELECTRICAL NOISE........................................................................................................... 2-2
2.4.2 EXISTING GMA340 AND PMA8000 INSTALLATIONS ......................................................2-3
2.4.3 POWER .............................................................................................................................. 2-4
2.4.4 COMMUNICATIONS PUSH-TO-TALK.................................................................................. 2-4
2.4.5 AUDIO PANEL INTERFACE ................................................................................................ 2-4
2.4.6 TRANSMIT INTERLOCK ..................................................................................................... 2-4
2.4.7 BACKLIGHTING................................................................................................................. 2-4
2.4.8 UNSWITCHED INPUTS........................................................................................................2-5
2.4.9 "SWAP" MODE..................................................................................................................2-5
2.4.10 PUBLIC ADDRESS MODE................................................................................................. 2-6
2.4.11 MISCELLANEOUS LOGIC OUTPUT (J2, PIN 18) ............................................................... 2-6
2.4.12 AUDIO ACTIVE OUTPUT (J1, PIN 24).............................................................................. 2-6
2.5 INTERCOM WIRING............................................................................................................................ 2-6
2.5.1 MUSIC INPUTS................................................................................................................... 2-6
2.5.2 PLAYBACK BUTTON INSTALLATION .................................................................................2-7
2.6 MARKER BEACON INSTALLATION.................................................................................................... 2-7
2.6.1 MARKER ANTENNA INSTALLATION ................................................................................. 2-7
2.6.2 MARKER BEACON HIGH SENSE SELECT (J2, PIN 30)........................................................ 2-7
2.6.3 EXTERNAL MARKER LIGHTS............................................................................................ 2-7
2.6.4 MIDDLE MARKER SENSE ..................................................................................................2-7
2.7 USER ADJUSTMENTS ......................................................................................................................... 2-8
2.7.1 ADJUST SCREEN................................................................................................................ 2-8
2.7.2 RENAME “SWITCHED” INPUTS.......................................................................................... 2-8
2.7.3 BLUETOOTH® MENU ........................................................................................................ 2-9
2.8 COMMUNICATIONS ANTENNA INSTALLATION NOTES ..................................................................... 2-9
2.9 PMA450 PIN ASSIGNMENTS............................................................................................................ 2-10
2.10 WIRING CHECKOUT ...................................................................................................................... 2-11
2.11 UNIT INSTALLATION......................................................................................................................2-11
2.12 OPERATIONAL CHECKOUT ...........................................................................................................2-11
2.12.1 REQUIRED TEST EQUIPMENT........................................................................................ 2-11
2.12.2 AUDIO PANEL TEST...................................................................................................... 2-11
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page ii Rev. 3, November 2014
2.12.3 MARKER CHECKOUT (050-450-0100, ONLY) ...............................................................2-12
2.12.4 BLUETOOTH CHECKOUT............................................................................................... 2-12
2.12.5 INTERNAL RECORDER CHECKOUT................................................................................2-12
2.13 FINAL INSPECTION ........................................................................................................................2-12
Section III OPERATION............................................3-1
3.1 SCOPE ..............................................................................................................................................3-1
3.2 POWER AND FAIL SAFE (1)................................................................................................................3-1
3.3 MENU SELECTION (6)........................................................................................................................ 3-2
3.4 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2)....................................................................3-2
3.4.1 SPLIT MODE......................................................................................................................3-2
3.5 COM AUDIO SELECTOR (3).............................................................................................................. 3-2
3.5.1 SWAP MODE (SWITCH FROM COM 1 TO COM 2REMOTELY) ............................................ 3-3
3.5.2 INTELLIAUDIO® DIMENSIONAL AUDIO ...........................................................................3-3
3.5.3 COM MONITOR MODE ......................................................................................................3-3
3.5.4 NAVAID SELECTION (4) ....................................................................................................3-3
3.6 SPEAKER AMPLIFIER (7)................................................................................................................... 3-4
3.6.1 PUBLIC ADDRESS FUNCTION ............................................................................................ 3-4
3.7 MARKER BEACON OPERATION (9) (UNIT PART NUMBER 050-450-0100, ONLY)............................. 3-5
3.8 INTERCOM OPERATION (8)............................................................................................................... 3-6
3.8.1 INTELLIVOX® INTERCOM VOX-SQUELCH........................................................................ 3-6
3.8.2 INTERCOM VOLUME CONTROL (1) ................................................................................... 3-6
3.8.3 INTERCOM MODES (8) ......................................................................................................3-7
3.9 MUSIC AND MUSIC MUTING ............................................................................................................. 3-8
3.9.1 MUSIC MUTING ................................................................................................................ 3-9
3.9.2 MUSIC VOLUME................................................................................................................ 3-9
3.9.3 MUSIC IN PILOT ISO MODE............................................................................................... 3-9
3.10 BLUETOOTH® CONNECTION......................................................................................................... 3-10
3.10.1 PAIRING AND UNPAIRING BLUETOOTH DEVICES .......................................................... 3-10
3.11 BLUETOOTH® TELEPHONEMODE............................................................................................... 3-10
3.11.1 CELLULAR TELEPHONE SIDETONE ................................................................................ 3-11
3.12 INTERNAL RECORDER AND PLAYBACK......................................................................................... 3-11
3.13 USER SETUP MENUS....................................................................................................................... 3-12
3.14 LCD ADJUSTMENT........................................................................................................................ 3-12
3.14.1 DISPLAY TIMEOUT........................................................................................................3-12
3.14.2 RENAME “SWITCHED” INPUTS...................................................................................... 3-13
3.14.3 BLUETOOTH SETUP....................................................................................................... 3-13
3.15 USB CHARGING PORT (10) ........................................................................................................... 3-13
Section IV – Warranty and Service....................................4-1
4.1 WARRANTY........................................................................................................................................ 4-1
4.2 FACTORY SERVICE............................................................................................................................ 4-1
Appendix A – PMA450 Installation Drawings......................................................... A
Appendix B – J1 Connector Interconnect ..................................................................B
Appendix C – J2 Connector Interconnect ................................................................. C
Appendix D – Instructions for FAA Form 337 and continuing airworthiness ...... D
8.1 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS .........................................................................D
8.2 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS,AUDIO SYSTEM ................................................D
Appendix E – RTCA DO160G Environmental Qualification Form.............................E
Rev
Date
Change
0
5/25/2014
New Release of manual
1
July 2014
Revise after TSOA
2
September 2014
Update with no marker version information
3
November 2014
Change Marker High sense operation (S/N E01151 and above)
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 1-1 Rev. 3, November 2014
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The PMA450 represents a revolutionary step in cockpit audio control and intercommunications utility.
IntelliAudio®, using the USAF patented technology, provides True Dimensional Sound, helping pilots to
more easily discern from simultaneous radio receptions. Our patented IntelliVox® design, front panel USB
power jack, and pilot programmable configurations, marks this panel as the next level of audio control. The
unit is 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 PMA450.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA450series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model
Description
Part Number
PMA450
Digital Stereo Audio Selector Panel with Marker Beacon,
USB Charging port
050-450-0100
PMA450
Digital Stereo Audio Selector Panel with USB Charging
port without Marker Beacon
050-450-0200
1.3 EQUIPMENT DESCRIPTION
The PMA450 is a state-of-the-art audio isolation amplifier and audio selector that contains an automatic
voice activated (VOX) intercom system and integral marker beacon receiver. It can switch two transceivers
(Com 1, Com 2) and six receivers (Nav 1, Nav 2, MKR, and three additional inputs which can be individually labeled, for use with ADF, DME, AUX, etc.).
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by FCC regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PMA450 must be interfaced with an approved system.
There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar altimeter warning.
Pushbuttons select the receiver audio source provided to the headphones. A SPR button allows the user to
listen to the receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker audio is
muted during transmit. Unswitched inputs 1& 2 are always presented to the aircraft speaker. Unswitched
input 3 & 4 will be presented to the speaker when the front panel SPR push button has been selected.
Pushbutton switches select one of the communication transceivers for the pilot and copilot position, and
allows radio transmission. In "Split Mode" the PMA450 has the ability to allow the pilot to transmit on
Com 1 while the copilot can transmit on Com 2. A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any reason, or if the power switch is placed in the Off (Fail-safe)
position. Unswitched input #1 is also provided to the pilot headphone (left side headset ear cup) in fail-safe
A six-station voice activated (VOX) intercom is included in the PMA450. This system has PS Engineer-
ing’s patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incorporates
pilot isolate, all and crew modes, two independent stereo music inputs with "SoftMute™". Intercom vol-
ume control is through two concentric front panel knobs and a pushbutton intercom mode switch. The small
volume knob controls the intercom level for the pilot and copilot, while the large knob controls the passenger intercom volume. Intercom squelch is automatic.
A, 75 MHz Marker Beacon receiver and 3-light indicator is integrated in the PMA450 (050-450-0100 only). This provides the necessary Marker Beacon lights and audio indications necessary for that portion of an
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 1-2 Rev. 3, November 2014
Instrument Landing System (ILS) approach. A pushbutton labeled MKR allows the pilot select audio on as
well as test and mute modes. Marker high sensatvoty is also controlled by this button (see § S/N and
above). Below S/N E01151 high sense is switched externally (see §2.6.2 for details.
The front panel USB-type connector is available for charging devices, such as iPad or cell phones. Up to 10
Watts are available. This connector does NOT provide any data interface.
In the PMA450, a Bluetooth® wireless interface is available for wireless telephone and music connection.
1.4 APPROVAL BASIS
FAA TSO Approval
The PMA450-series Audio Selector Panels are FAA approved under TSO C139A (Audio Amplifiers) TSO
C35d (Marker Beacon Receivers) and C71 (DC Power Supplies)
All systems comply with relevant portions of EUROCAE RTCA MPS WG No. 7/70, DO-143 and (Marker
Beacon Receivers), ED-14C/DO-160G (Environmental Conditions and Test Procedures for Airborne
Equipment), ED12B/DO-178B, Level D (Software Considerations for Airborne Equipment) and ED-
18/DO-214A (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio Systems).
1.1.1 Limitations
This article meets the minimum performance and quality control standards required by a technical standard
order (TSO). Installation of this article requires separate approval.
Refer to Advisory Circular 20-41A for information on TSO installation approval.
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
1.5 SPECIFICATIONS
TSO COMPLIANCE
Marker Beacon:
FAA TSO C35d, Class A
Audio Selector/Intercom:
FAA TSO C139a, Class 1a
DC Charging Jack
FAA TSO C71
APPLICABLE DOCUMENTS:
RTCA/DO-214A RTCA/DO-143 RTCA/DO160G
RTCA/DO-178C, DO-254
ENVIRONMENTAL Qualifications:
A1D1CABSMXXXXXXZBABATBXXE2XXX
Operating Temperature Range:
-15º C to 55ºC
Altitude:
Up to 35,000 feet in an non-pressurized area
DIMENSIONS:
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth behind panel 7.15 in. (18.16 cm)
WEIGHT
PMA450 Unit
Rack with connectors
1.34 lb. (0.61 kg)
0.51 lb. (0.24 kg)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
11 to 33 VDC
Maximum Current:
3.5 Amp (Externally protected by a 5A pull-type breaker)
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 1-3 Rev. 3, November 2014
Audio Selector Specifications
Audio selector panel input impedance:
510
Input Isolation:
-60 dB (min.)
Speaker Muting:
-60 dB (min.)
Speaker Output (into 4 ) with no clipping
14 VDC:
28 VDC:
3 Watts (min.)
10 Watts (min.)
Receiver Inputs:
7 (Com 1, Com 2, Nav 1, Nav 2, 3 ea. Switched Inputs
available)
Unswitched Inputs:
4
Transmitter Selections:
3 (Com 1, Com 2, Com1/2)
Speaker Impedance:
4
Headphone Impedance:
150 – 1000
Headphone Output:
30 mW each headset, no clipping <.5% THD typical
Microphone Impedance:
150 - 600
Bluetooth Radio (PMA450 -1702 only)
Class 3, FCC ID QOQWT32AE
Intercom Specifications
Intercom Positions:
6 places (with individual IntelliVox® circuits)
Music Inputs:
2, (Independent, Stereo)
Music Muting:
>-30 dB "Soft Mute" when Com or intercom active.
Distortion:
<1% THD @ 30 mW into 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
10 Hz – 26 kHz
MARKER BEACON RECEIVER (-0100 only)
Frequency:
75 MHz Crystal Controlled
Sensitivity:
Low:
High:
Capable of: (preset at factory for field application)
1000 Volts (Hard) (360 to 570 V soft)
200 Volts (Hard) (130 to 200 V soft)
Selectivity:
-6 dB at ±10 kHz
-40 dB at ±120 kHz
External Lamp Output:
7.5 (±4 VDC unloaded, at maximum brightness) VDC
positive when active, max. current 125 mA
MM Sense:
Active high (4.5 ± 1.0VDC)
USB Charging Port
Available Current
10 Watts Maximum output, short circuit and over-current
protected
Voltage
5 VDC
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model
Description
Part Number
PMA450
PMA450 Digital Audio Panel with Marker, Stereo Intercom, USB
Charging jack, and Bluetooth connectivity
050-450-0100
PMA450
Same as above, without Marker Beacon capability
050-450-0200
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 1-4 Rev. 3, November 2014
PMA450 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
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA450
b. Isn’t this optional? You’re not required to have speaker are you? Speaker, 4
c. Headphone Jacks (Stereo, as Required)
d. Microphone Jacks (as Required)
e. Headphones, 150 (Stereo), up to 6 as required
f. Microphones, up to 6 as required
g. Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed) (-0100 Only)
h. Interconnect Wiring
1.8 LICENSE REQUIREMENTS
None
PMA450 Bluetooth™ Radio approval:
FCC ID: QOQWT32AE
Industry Canada ID: 5123A-BGTWT32AE
CE EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 2-1 Rev. 3, November 2014
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering PMA450
Audio Selector Panel/Intercom/ with internal Marker Beacon.
Please read this manual carefully before beginning any installation to prevent damage and post-installation
problems.
Installation of this equipment requires special tools, test equipment (refer to §2.12.1) and installer
knowledge as required by 14 CFR 65.81 (b).
2.1.2 Certification Requirements
NOTE
The PMA450 requires specialized knowledge and tools for an effective installation. An appropriately rated
Certified Aircraft Repair Station must install this equipment in accordance with applicable regulations. PS
Engineering, Incorporated warranty is not valid unless the equipment is installed by an authorized PS Engineering, Incorporated dealer.
Failure to follow any of the installation instructions, or installation by a non-certified individual or agency
will void the warranty, and may result in an unairworthy installation.
This article meets the minimum performance and quality control standards required by a technical standard
order (TSO). Installation of this article requires separate approval. Refer to AC 20-41A for information
regarding Substitute TSO Aircraft Equipment.
2.2 Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible signs of shipping
damage. Examine the unit for loose or broken buttons, bent knobs, etc. Verify the correct quantity of components supplied with the list in §1.6. If any claim is to be made, save the shipping material and contact the
freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accessories show
any sign of external shipping damage, contact PS Engineering to arrange for a replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned to PS Engineering for any
other reason should be shipped in the original PS Engineering packaging, or other UPS approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air-cooling of the PMA450 is not required. However, the units should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate
cooling air provided.
2.3.2 Mounting Requirements
The PMA450 must be rigidly mounted to the instrument panel of the aircraft structure, within view and
reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2B, or other
FAA-approved aircraft technical data. The unit may be mounted in any area where adequate clearance for
the unit and associated wiring bundle exist.
To prevent noise, avoid installing the unit close to high current devices or systems with high-voltage pulse
type outputs, such as DME or transponders. Avoid running the interconnecting bundles near any high current wires.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 2-2 Rev. 3, November 2014
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 PMA450. 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).
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 Electrical Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA450 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 PMA450 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 PMA450 was designed in a RFI hardened chassis and has internal Electromagnetic
Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the airframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a minimum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better). Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a
2- or 3-conductor, shield wire as shown on the installation-wiring diagram.
The shields can be daisy-chained together, and then connected to the ground lugs mounted on the back
plate shown in Appendix B.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 2-3 Rev. 3, November 2014
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
2.4.1.1 Music Inputs and Noise
PMA450 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 signal and ground inputs on the PMA450. 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.
NOISE NOTE
Adding a high-performance audio control system, particularly in conjunction with high-performance active
noise canceling headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS
Engineering makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions, particularly with older avionics.
2.4.2 Existing GMA340 and PMA8000 Installations
If the installation replaces a GMA340 or any of the PMA8000 series, no changes are necessary as long as
the existing installation meets the requirements (applies to S/N Exxxx and above). All existing functions of
the GMA340 as afforded by the PMA450 will become instantly available. However, if the previous installation had three COMs, the PMA450 will not support the third COM, the PMA450 handles only two COM
transceivers. The PMA8000C will support three coms.
2.4.2.1 Differences with GMA340 connector
Connector
Pin
GMA340 Function
PMA450 Function
J13COM 3
No Connection
J14COM 3
No Connection
J15COM 3
No Connection
J16COM 3
No Connection
J116MASQ Inhibit
No Connection
J123COM 3 Speaker Load
AUX Audio Input
J124COM 3 Speaker Load
CNX80 Inhibit
J125COM Speaker Load
No Connection
J126COM Speaker Load
No Connection
J127COM Speaker Load
No Connection
J128COM Speaker Load
No Connection
J129No Connection
Unswitched #3
J215High Music Gain Select
Unswitched #4
J2178
Ω Speaker Select
No Connection
J218No Connection
Aux Enable Output
J219Tone Enable
PA Enable
J229Failsafe warn
No Connection
J230Com TX Mute
MKR High Sense control
Table 2-2 GMA340–PMA450 connector differences
Installations where the external marker outputs are connected to a Sandel 3308 Navigation Display will
require additional loading resistors. Refer to the Sandel installation data for more information.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 2-4 Rev. 3, November 2014
2.4.3 Power
The PMA450 is compatible with both 14 and 28 Volt DC systems. A five (5) Amp circuit breaker is re-
quired for all installations. Power and ground wires should be #22 connected to J2 Pins 8 and 9. Connect
airframe ground to J2 Pin 10 and 11 only. No dropping resistors are required.
2.4.4 Communications Push-to-Talk
An important part of the installation is the PTT (Push-To-Talk) switches that allow the use of your aircraft
communications radio for transmissions. There are three typical configurations that can be used. Select the
case that best fits the installation. Only the person who presses their PTT switch will be heard over the ra-
dio. If the pilot and copilot both use the PTT, the only pilot position has access to the radio. The pilot posi-
tion will have PTT control regardless of the mic selector switch or copilot PTT when the PMA450 is in the
OFF/EMG mode.
CASE I: PTT is built into both pilot and copilot yokes.
CASE II: PTT is in pilot yoke only. This configuration requires a modified external PTT switch plugged
into the copilot's microphone jack. (See Appendix A). When the copilot's PTT is pressed, the intercom
switches the microphone audio from pilot to copilot mic.
CASE III: No built in PTT. This requires two built in PTTs to be installed, or modified external PTT
switches to be used. Modify external PTT as required. See Appendix A.
2.4.5 Audio Panel interface
The PMA450 is designed to interface with standard aircraft avionics, and presents a 510 receiver imped-
ance. For best results, a twisted-shielded cable is recommended from the avionics audio source to the audio
panel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one conduc-
tor of the twisted-shielded cable.
2.4.5.1 Speaker Load
The PMA450 contains a speaker amplifier. The PMA450 does not contain any resistive speaker loads.
Some older aviation radios units with internal speaker amplifiers, require a resistive load. if their speaker
amplifier is not used. If needed, connect the radio speaker output from the transceiver to a 16, 3W resistor
in the harness.
2.4.5.2 Installation with Monaural Headsets
Not recommended, because the benefit of IntelliAudio is lost. However, if desired, the PMA450 can be
installed monaurally by using the LEFT audio connections only (left side contains Fail-Safe audio). Do
NOT short left and right together.
NOTE: Mono headsets that short the tip and ring (i.e. older models) will introduce audio distortion
when used. Modern, stereo headsets are recommended in all positions.
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 the radio manufacturer's installation manual.
2.4.7 Backlighting
The PMA450 has an automatic dimming of the pushbutton annunciation LEDs and marker lamps con-
trolled by a photocell. Control of the unit nomenclature backlighting is through the aircraft avionics di m-
mer 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
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back lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity
of the push-button annunciator LEDs.
2.4.8 Unswitched inputs
J1, pins 31 (Unsw 1), 44 (Unsw 2) 29 (Unsw 3) and J2 pin 15 (Unsw 4) are unswitched, unmuted (by
transmitter keying), inputs.
These inputs are presented to the pilot and copilot regardless of the audio configuration, and will always
mute the crew entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, GPS waypoint
audio, autopilot disconnect tones, or any other critical audio signal.
Unswitched #1 is always presented to the speaker, plus to the crew headphones, and is available to the pilot
in fail-safe (off) mode.
Unswitched 1 & 2 are always presented to the speaker, plus to the crew headphones.
*Unswitched 3 and 4 inputs are always presented to the crew headphones but presented to the aircraft
speaker only when the speaker is selected.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
Hear in SPR
Adjustable at installation
1
Yes
Yes
Yes
No
2NoYes
Yes
No
3NoYes
When SPR Selected
Yes
4NoYes
When SPR Selected
Yes
Table 2-3 Unswitched inputs
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient audio low. However, this
should NOT be connected to Music Low.
NOTE
Inputs 1 and 2 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 and #4 can be adjusted at installation. Refer to Adjustments §2.7.
2.4.9 "Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground, the user can switch between Com 1 and 2 by depressing this switch without having to
turn the mic selector switch. This yoke-mounted switch eliminates the need to remove your hands from the
yoke to change transceivers. The transfer of TX indication from Com 1 to Com 2 shows that the swap has
been initiated; there is no dedicated swap indicator.
2.4.9.1 Cell phone Sidetone
The PMA450 can provide cellular telephone sidetone (the user’s voice fed back to the headset). Some cell
phones provide sidetone, and may have poor audio quality if both sources are combined. The cell phone
sidetone is adjustable in the Bluetooth® operation screen See §2.7.
NOTE
Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement action, which may include a $10,000 fine per incident.
FCC Regulation 47 CFR § 22.925 Prohibition on airborne operation of cellular telephones.
Cellular telephones installed in or carried aboard airplanes, balloons or any other type of aircraft must not
be operated while such aircraft are airborne (not touching the ground). When any aircraft leaves the ground,
all cellular telephones on board that aircraft must be turned off.
PS Engineering, Inc. does not endorse using unapproved cellular telephone equipment in flight, and takes
no responsibility for the user’s action.
PS Engineering does not guarantee compatibility with personal cellular telephones.
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2.4.10 Public Address Mode
By holding the middle line-select pushbutton for more than one (1) seconds, the PMA450 will be placed
into public address (PA) mode. In this mode, the pilot will be talking over the cockpit speaker when he
presses his PTT switch. Copilot will still continue on the selected COM radio.
The display will include PA & SPR on the right side, and change to PUBLIC ADDRESS when the pilot’s
PTT is pressed.
2.4.10.1 PA Active Output (J2, Pin 19)
PA Active Out is a discrete output on J2 Pin 19 which will go low when PA mode is selected, providing a
logic level that can be used to incorporate a speaker-switching scheme. This 50 mA circuit (10Ω Z) can
control a switching means such as a small relay or other switching means that can transfer the speaker output amplifier from the cockpit speaker to drive another cabin speaker. If the PA mode is used with a microphone in proximity to an active cockpit speaker, feedback might result.
2.4.10.2 PA Mute (J2, Pin 12)
Pin 12 of J2 is a TTL logic output that is pulled low during PTT operation. This is used to control external
public address or external entertainment systems and prevent feedback during radio transmission.
2.4.11 Audio Active Output (J1, Pin 24)
Pin 24 on the J1 connector (and PA Mute Pin 12 on J2) should be connected to Apollo CNX80 for audio
message prioritization. The output is logic low when radio audio is present. Refer to CNX80 installation
manual for details.
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 easier wire routing through the aircraft.
2.5.1 Music Inputs
The PMA450 has two INDEPENDENT music inputs. Music input number 1 is J2 pins 23 (left channel)
and 24 (right channel), with respect to pin 25, and Music number 2 is connected to 26 (left channel), 27
(right channel), with respect to 28.
PMA450 has Bluetooth® connectivity to stream music from a paired device. This stream is distributed as
Music 1 and is connected in parallel with Music number 1. Refer to §3.9 for more information.
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NOTE
Use the lo w level output of any additional Music device to connect to the audio panel.
Maximum signal level is 3 VAC p-p. DO NOT use a speaker-level output, this will
cause internal damage in the audio panel.
CAUTION
Local oscillators and internal signals from Music 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.
2.5.1.1 Music 2 Mute (J2 Pin 13 & 14)
Connecting J2 pin 13 to pin 14 (or ground) through a SPST switch places the Music #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 is useful for passenger-area control of the music muting, and overrides
the menu-controlled setting.
However, Music 2 Mute control is also available in the PMA450 Music Mute Menu.
2.5.2 Playback button Installation
The pilot and copilot can hear the aircraft radio playback.
The Internal Recorder System can be played back from the front panel by pressing the RCV button of the
radio selected for transmission.
Or a remote, momentary, normally open (NO) push button switch may be installed if desired to activate the
Recording System playback. This switch can be located anywhere in cockpit convenient to the pilot's reach.
The NO switch should be connected to pin 22 of J2 of the PMA450, and ground. When installed, this button will act as in §3.12.
2.6 Marker Beacon Installation
2.6.1 Marker Antenna Installation
A marker beacon antenna, appropriate to the type and speed of the aircraft, is required (not included). Refer
to aircraft and antenna manufacturer's installation instructions, as well as AC43.13-2B (or later revision),
Chapter 3, for information on proper antenna installation techniques. The marker beacon antenna must be
mounted on the bottom of the aircraft.
2.6.2 Marker Beacon High Sense select (J2, Pin 30)(S/N D01150 and below only)
The default marker sensitivity for the PMA450 is low sense, or a threshold of 1000µV. To enable High
sensitivity, ground J2, Pin 30 through a toggle switch.
NOTE: Unless this switch is installed, the PMA450 s/N E01150 and below will always be in Low Sense
mode)
2.6.3 External Marker Lights
For installations that require external marker beacon lights, there are three outputs that can drive 12-Volt
lamps only. The external output lamps are driven high (typically +7.0 VDC 4.0 VDC unloaded, at MAX
brightness) when active. Maximum source current per lamp is 125 mA. Voltage varies with photocell
dimming.
2.6.4 Middle Marker Sense
A Middle Marker Sense output signal is available from the PMA450 to certain flight control systems. This
function will not operate during the test mode. This output will go to +4.5 VDC ( 1.0 VDC) when a valid
Middle Marker signal is received. This output is J1, pin 39.
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2.7 User Adjustments
To access the user adjustment menus, turn the PMA450 off, and then back on. While the version screen is
displayed, push and hold the bottom line-select button (there is an indicator bar in the display indicating
that a menu is available). This places the unit into the “User Configurable Mode – home screen”. This allows adjustment for:
LCD Screen Adjustment
Rename Switched Inputs
Bluetooth menus
Note: in this mode, the audio panel functions will be inoperative
2.7.1 Adjust Screen
The first items are adjustments to the Liquid Crystal Display, allowing the installer or user to tailor the contrast and backlight intensity to suit the cockpit conditions, and set the time period before the menus revert
to the “home” screen.
There are two screen visibility modes: LCD Brightness & LCD Contrast.
2.7.1.1 Brightness and Contrast
Adjusting either the Brightness or Contrast level requires selecting either of the two line select buttons and
then turning the inner knob. Counter clockwise to lower the number (level of Brightness & Contrast) and
clockwise to increase the number (level of Brightness & Contrast).
To change the display:
Press the line select for the desired item
Turn the small, inner knob to change the contrast and brightness as desired. Recommended set-
tings are Brightness 10, and Contrast 5.
LCD will change in real time while adjustments are made.
It will stay in this screen until the menu times out and returns to the adjustment home screen.
2.7.1.2 Display Timeout
This is a feature that allows the end user to adjust how quickly the screen levels menus timeout (revert to
main menu).
This allows adjustment of the timeout screen and can be configured from 1 second to 30 seconds when
turning the inner knob.
For a user that is unfamiliar with the product, this will give them enough time to learn the system. After
being familiar then the user can speed up the timeout screen as needed.
It will stay in this screen until the menu times out and returns to the adjustment home screen.
To exit the home screen and return to normal operation, turn the PMA450 off, and back on again.
2.7.2 Rename “Switched” Inputs
The system is factory set to default as ADF, DME & AUX as shown.
The three inputs are from top to bottom:
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1. Switched input #1 J1, Pin 7 wrt Pin 8 (Default ADF)
2. Switched input #2 J1, Pin 21 wrt Pin 22 (Default DME)
3. Switched input #3 J1, Pin 23 wrt Pin 43(Default AUX)
NOTE: In PMA 450 -0200 (No Marker) Switched #1 , #2 or #3 can be renamed to MKR for a remote input.
The customer will have access to rename. Maximum 9 letters per line and A thru Z & 0 thru 9 will be available.
Press the line select for desired input.
Turn the large outer knob to select the letter to change. A cursor appears under the active letter po-
sition.
Turn the small, inner knob to increment or decrement the letter.
You can select 9 alphanumeric digits.
To add a blank space:
o Blank spaces can’t be added to the end of a strink, but you can add a temporary character
and go back and change it to a space:
o TACARADIOA1
o Change extra “A”s to spaces TAC RAD 1
It will stay in this screen until the menu times out and returns to the adjustment home screen.
Cycle PMA450 power to exit the setup screen.
2.7.3 Bluetooth® menu
The Bluetooth menu allows the user to:
Reset (remove) all paired devices
Set a pairing pass code
Change the PMA450’s device ID
2.7.3.1 Un-pair All
Pressing the line select next to Un-pair All removes all Bluetooth devices. This is used when the pairing of
devices becomes unreliable.
2.7.3.2 Pair:
This allows the user to set any desired pass code that users will use to pair Bluetooth devices. Four digits, 1
to 9 can be used.
2.7.3.3 ID:
This allows the user to set the name of the audio panel as it will appear on devices searching for the
PMA450. Seven alphanumeric digits are available. Factory default is PMA450, but you could set “N1245,”
or “Skyhawk, as an example.”
2.8 Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communications antenna is located on top of the aircraft while the other communications antenna is installed on the bottom. Any antenna
relocation must be accomplished in accordance with AC 43.13-2B, aircraft manufacturers’ recommendations and FAA-approved technical data.
WARNING
It is probable that radio interference will occur in the split mode when the frequencies of the two aircraft radios are adjacent, and/or the antennas are physically close together. PS Engineering makes no
expressed or implied warranties regarding the suitability of the PMA450 in Split Mode.
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2.9 PMA450 Pin assignments
J1
Function
J2
Function
1
Marker Antenna
1
Pilot Phones Lo
2
Marker Ant Lo
2
Copilot Phones Lo
3
No Connect
3
Copilot Phones (L)
4
No Connect
4
Copilot Phones (R)
5
No Connect
5
Lights lo
6
No Connect
6
14/28 V Lights
7
SW#1 (ADF Audio) In
7
14/28 V Lights
8
SW#1 (ADF 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
PA Mute
13
Com 2 Audio
13
Mute Inhibit
14
Com 2 Audio Lo
14
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
RESERVED
19
Nav 2 Audio
19
PA Enable Out
20
Nav 2 Audio Lo
20
Swap
21
SW#2 (DME) Audio
21
Swap Lo
22
SW#2 (DME) Audio Lo
22
IRS Playback
23
SW#3 (Aux) Audio
23
Music 1 (L)
24
CNX80 Inhibit
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
RESERVED
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
Ext IM MKR
36
Pass 1 Mic Audio Lo
37
Ext OM MKR
37
Pass 2 Mic Audio
38
Ext MM MKR
38
Pass 2 Mic Audio Lo
39
MM Sense
39
Pass 3 Mic Audio
40
Pass HP (L)
40
Pass 3 Mic Audio Lo
41
Pass HP (R)
41
Pass 4 Mic Audio
42
Pass HP Lo
42
Pass 4 Mic Audio Lo
43
Unswitched 2 Lo
43
Speaker Lo
44
Unswitched 2 Audio
44
Speaker Output
Table 2-4: PMA450 Pin Assignments
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2.10 Wiring Checkout
After wiring is complete, verify power is ONLY on pins 8 and 9 of the J2 and airframe ground on connector pins 10 and 11. Failure to do so will cause serious internal damage and void PS Engineering's warranty.
2.11 Unit Installation
To install the PMA450, gently slide the unit into the mounting rack until the hold-down screw is engaged.
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. In-
ternal damage will result.
2.12 Operational Checkout
2.12.1 Required Test Equipment
In order to return an aircraft to service after installation of the PMA450, the installer must have access to a
Marker Beacon signal generator:
a. IFR NAV401L, NAV402AP, IFR4000
b. TIC T-30D, T-36C
Equivalent test equipment is acceptable as long as the testing requirements can be met.
2.12.2 Audio Panel Test
NOTE
The IntelliVox® is designed for ambient noise levels of 80 dB or above. Therefore some clipping may occur in a quiet cabin, such as without the engine running, in a hangar. This is normal.
Use of a Stereo headset is required to obtain full effect of IntelliAudio processing in the crew positions.
1. Apply power to the aircraft and avionics.
2. Plug stereo 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 audio 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 C1 Xmt select button (lower row).
7. Verify that both of the C1 indicators 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 microphone 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 C1 Xmt button blinks
when transmitting.
9. Verify that pushing the C2 button 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 C1 Xmt button. While holding the C1 button, press the C2 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 or menu.
13. Activate the cockpit speaker by holding the lower line select for 1 seconds SPR should appear on the
LCD display. Verify that all selected audio is heard in the cockpit speaker. Verify that the audio mutes
when the mic is keyed.
14. Verify that the appropriate LED in the lower button row blinks when either push to talk is keyed.
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15. Verify proper Intercom system operation in the ALL, ISO and CREW modes (see Table 3-1).
16. Verify that the audio selector panel system does not adversely affect any other aircraft system by systematically switching the unit on and off, while monitoring the other avionics and electrical equipment
on the aircraft.
2.12.3 Marker Checkout (050-450-0100, only)
1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test, verify that a
430 Volt, modulated 95% with 1300 Hz, signal will illuminate the amber (M) marker light, and that
marker audio is present in the headphones when the Marker Audio (MKR) push-button has been depressed. Select SPR for speaker to verify marker audio availability on the cabin speaker. Verify that
the white (I) and blue (O) lights will illuminate within 3dB of the amber lamp, with 3000 HZ and
400 Hz applied, respectively.
2. Put unit in High Marker sensitivity (See §3.7 ). Repeat with the unit in HIGH sensitivity, 160 V with
applied.
3. Connect the marker antenna and verify proper operation.
2.12.4 Bluetooth Checkout
Verify that the PMA450 will “pair” with a Bluetooth device, and interface with cellular phone and Music
source. See section 3.12 for more information.
2.12.4.1 TEL Checkout
Pair the PMA450 with a Bluetooth telephone device. Verify that the pilot headset is connected to the cellular telephone system (if installed). Verify that by using the pilot side PTT, the pilot can transmit on the other selected radio (Com 1 or Com 2). The telephone function will allow any person heard by the pilot on the
intercom, also heard on the telephone.
2.12.5 Internal Recorder Checkout
With headset plugged into pilot’s side jacks, tune COM 1 to local frequency, such as FSS or ATC ground.
Select Com 1 on mic selector switch, and record several incoming radio transmissions.
Press the Com receiver pushbutton (C1 or C2) that corresponds to the selected radio transmitter and hold
for approximately one second. This action will then automatically play back the last recorded message.
Press and HOLD the button again to stop the play back, and then momentarily press again to play prior
messages.
This audio should appear in the pilot and copilot headsets, and only be incoming transmissions from the
transceiver selected in the mic select switch. Depress the audio panel or yoke mounted playback switch,
and verify that messages play, in the order received. Repeat for other COM. The playback will be stopped
by audio on the selected com. The message can be replayed from the beginning, and audio received during
the playback will not be stored.
2.13 Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation interferes with aircraft 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 accordance 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 surfaces, and
that all contact points are protected from abrasion.
Complete documentation that may be required, such as a logbook entry, weight and balance computation and FAA
Form 337. Sample text for FAA Form 337, and instructions for continuing airworthiness can be found in Appendix F.
Return completed warranty registration application to P S Engineering, or complete online at www.ps -engineering.com.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 2-1 Rev. 3, November 2014
Complete documentation that may be required, such as a logbook entry, weight and balance computation and FAA
Form 337. Sample text for FAA Form 337, and instructions for continuing airworthiness can be found in Appendix F.
Return completed warranty registration application to PS Engineering, or complete online at www.ps -engineering.com.
PS Engineering
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Installation and Operator’s Manual
200-450-0000 Page 3-1 Rev. 3, November 2014
Section III OPERATION
3.1 SCOPE
This section provides detailed operating instructions for the PS Engineering PMA450, Audio Selector Panel/Marker Beacon Receiver/Intercom Systems. Please read it carefully before using the equipment so that
you can take full advantage of its capabilities.
This section is divided into sections covering the basic operating areas of the PMA450 systems. They are
Communications Transceiver Selection, Audio Selector, Intercom, Marker Beacon Receiver and special
functions, including the Bluetooth® functionality in the PMA450.
Figure 3-1 PMA450 Operating Controls
3.2 Power and Fail Safe (1)
Unit power is turned on and off by pushing the volume knob (1). There is a built in delay to prevent accidental shut off while adjusting the intercom volume in turbulent conditions. In the OFF or "EMG" position,
the pilot headset 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, intercom and marker beacon receiver. All
transceiver and receiver selections will be remembered and return to the last state when turned on.
1 Unit power is turned on and off by pushing the volume knob (1). There is a built in delay to prevent
accidental turn off.
1
2
3
4 5
6
8
9
7
1. Volume on off
2. Transmit Selection
3. Receiver Selection
4. Nav selection
5. Line select buttons
6. LCD Display
7. Speaker Selection
8. Intercom
9. Marker
10. USB Power Port
10
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3.3 Menu Selection (6)
The PMA450 uses a Liquid Crystal Display and three line-select buttons to access advanced functionality
in a very logical manner. Press the line select key to select a specific item on each menu. Items are toggled
on and off by pressing the line select key as well.
When navigating the menus, the screen will automatically return to this
“home” screen after a period of inactivity. This delay time is configurable from the initialization menu as
well, for between 1 and 30 seconds.
A vertical bar next to a button, indicates the button can perform a function on that menu.
A split bar indicates that a secondary function is
available when that button is held for more than
one second. These functions are:
Public Address (PA – middle button)
Speaker (SPR – lower button)
Figure 3-2 Top level Menu
3.4 Communications Transmit (XMT) Selection (2)
The PMA450 has four buttons to select communications transceiver functions, two each C1 and C2. C1
refers to VHF COM 1, and C2, to VHF COM 2. To select a VHF COM for transmit; push the lower button
in the XMT (transmit) section. The radio is automatically selected to receive incoming radio calls when the
XMT is selected. With a PMA450, you will never transmit on a radio that you are not receiving.
To select a VHF COM radio to listen only, push the C1 or C2 button in the RCV (Receive) section.
The PMA450 will remember when you have selected a radio for receive only, and then switch to it for
transmissionand switch back.
3.4.1 Split Mode
In the SPLIT mode, the pilot position transmits and receives on COM 1, and the copilot can transmit and
receive on COM 2 independently.
Pressing the C1 and C2 XMT buttons (above the └ SPLIT ┘ legend), puts the PMA450 into SPLIT com
mode.
In split mode:
Position
COM 1
Receive
COM 1
Transmit
COM 2
Receive
COM 2
Transmit
Switched
Audio
Unsw. Au-
dio
Copilot
Intercom
Passenger
Intercom
Pilot
Yes
YesNONO
Yes
YesNONO
CopilotNONO
Yes
YesNOYesNONO
Passengers
NONONONONONONO
YES
The intercom is deactivated automatically when you enter SPLIT mode.
o Push the ICS button until the green LED lights up CRW to restore intercom between pilot
and copilot.
o Intercom between crew and passengers is not possible in split mode
The spatial component of IntelliAudio is defeated in split mode.
To exit SPLIT mode, reselect C1 or C2 XMT button
3.5 COM Audio Selector (3)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associa ted RCV button. You will always hear the audio from the selected transceiver.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 3-3 Rev. 3, November 2014
3.5.1 Swap Mode (Switch from Com 1 to Com 2 remotely)
With an optional yoke mounted, normally open momentary switch, the pilot can change from the current
Com transceiver to the other by pressing this switch. To cancel "Swap Mode," either press the yoke mounted switch again, or select a different Com with the XMT buttons.
3.5.2 IntelliAudio® Dimensional Audio
Various audio signals are presented to the DSP and processed to “appear” in a different location to the
crew. “Multi-Talker” (US Patent #7,391,877) specifies up to nine locations. This helps the crew to better
comprehend speech by locating it in a manner easier differentiated by the human brain.
Intercom and other audio is not spatially processed, only the pilot and copilot VHF COM audio.
The spatially processed dimensional sound in the PMA450 can be adjusted to accommodate the user pref-
erences.
This adjustment allows the Spatial Audio inputs to be “relocated” on any of nine (9) defined “Head Related
Transfer Function” (HTRF) locations.
Push IntelliAudio → IntelliAudio Config to access. In the IntelliAudio® mode, repeated pressing of the
COM 1 or COM 2 line select buttons moves the corresponding half-circle cursor to the locations relative to
the listener graphic in sequence.
Pressing the Done button exits the configuration setting mode. This setting is recalled at system power up.
Figure 3-3 IntelliAudio – True Dimensional Sound, Spatial Location Display, showing C1 at 30°left
and C2 at 90° right of center.
3.5.3 Com Monitor Mode
The PMA450 is equipped with a Monitor function, which allows a secondary com radio audio to be muted
by the primary radio (selected for transmit).
To toggle the Monitor mode on and off, Press IntelliAudio → MONITOR
NOTE: Monitor Mode and Spatial Audio Processing (IntelliAudio) are mutually exclusive – entering one
mode will cancel the other.
3.5.4 Navaid Selection (4)
VHF Navigation receivers can be selected directly from the front panel with the N1 and N2 (VHF Navigation receiver 1 and 2) buttons. The selected source is indicated by a green LED.
Additional navigation aid or other audio sources can be selected using the LCD menus.
Press the top line select RADIO → SWITCHED INPUTS, → and desired audio source.
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PMA450 Audio Selector Panel and Intercom System
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200-450-0000 Page 3-4 Rev. 3, November 2014
NOTE: Switched Inputs can be renamed at the configuration set up. See §3.13 for more information.
In SPLIT mode, only the pilot will hear selected navigation audio.
3.6 Speaker Amplifier (7)
To activate the PMA450 cockpit speaker output, press and hold the bottom line-select button (SPR) for one
second or until SPR appears in the display.
In “Split Mode” all audio that the pilot hear will also be present in the speaker.
Unswitched audio #1 & #2, (the inputs dedicated to autopilot disconnect, altimeter warning, etc.) will come
through the speaker regardless of the speaker button position.
Depending on installation, important audio annunciations such as radar altimeter or autopilot disconnect
will come over the speaker even if it is not selected, while other unswitched, but muted inputs, such as GPS
alerts, will only be present if the SPR button is selected. Consult your professional avionics installer for
these important configuration details.
Unswitched
Input
Hear in
Fail Safe
(Pilot)
Hear in
Crew Headset
Hear in SPR
1
Yes
Yes
Yes
2NoYes
Yes
3NoYes
When SPR selected
4NoYes
When SPR selected
3.6.1 Public Address Function
To access PA function, press and hold the center line select button for more than 1 second, until the display
changes to PUBLIC ADDRESS.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
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200-450-0000 Page 3-5 Rev. 3, November 2014
When PA mode is active, all microphones except for the Pilot will be disabled for complete and uninterrupted announcements.
The pilot microphone will be heard on the speaker and headsets when the pilot PTT is used.
The copilot can continue to use the selected com radio while the pilot will be heard over the speaker.
To exit PA mode, push and hold the middle line-select button again until PUBLIC ADDRESS is off or
cycle power on the audio panel.
3.7 Marker Beacon Operation (9) (unit part number 050-450-0100, only)
The Marker Beacon Receiver uses visual and audio indicators to alert you when the aircraft passes over a
75 MHz transmitter.
The audio from the Marker Beacon Receiver can be heard by pushing the "MKR" button. AUD will light
up green.
The Blue lamp, labeled “O”, is the Outer Marker lamp and has
an associated 400-Hertz 'dash' tone. The lamp and tone will be
keyed at a rate of two tones/flashes per second when the aircraft is in the range of the Outer Marker Beacon.
The Amber lamp, labeled “M”, is the Middle Marker lamp and
is coupled with a 1300 Hertz tone. It is keyed alternately with short 'dot' and long 'dash' bursts at 95 combinations per minute.
The White lamp, labeled “I”, is the Inner marker and has a 3000 Hertz 'dot' tone. The lamp and tone will be
keyed at a rate of six times per second.
Holding the MKR button for one second activates marker test lamp, labeled "T/M" and illuminates all
three lamps simultaneously to assure the lamps (internal and external) are in working order. TST does not
activate MM autopilot sense output. Releasing the button returns to the last sensitivity.
Pressing the marker mode select (“T/M”)
for one second, while beacon audio is active, will also cause the marker audio to
mute for that beacon. The next beacon received will re-activate the audio.
The marker beacon receiver audio volume
can be adjusted from the menu.
Press RADIO → VOLUMES →
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MARKER, and turn the small knob to adjust the marker beacon volume. The green volume bar and numerical readout will indicate the receiver volume in this menu. NOTE: marker Volume cannot be turned completely off.
NOTE: PMA450, P/N 050-450-0200, without Marker Beacon, will not have a Volume selection.
3.7.1 Marker Beacon Sensitivity
Press and hold the MKR button for about two seconds, or the letter H appears in the LCD display, indicating that the Marker beacon sensitivity in in the High Sense Mode. Repeat to switch back to Low Marker
Sense (“H” disappears.)
[Serial Number D1150 and below only: Marker Beacon sensitivity is set using an external toggle switch, if
desired. The PMA450 defaults to low sensitivity, and will be in high sensitivity if the switch is closed, connecting J2-Pin 30, to ground. ]
3.8 Intercom Operation (8)
3.8.1 IntelliVox® Intercom VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. Through three individual signal processors,
the ambient noise appearing in all six microphones is constantly being sampled. 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.
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
Table 3-1 Mic Muff ™ Part Numbers
3.8.2 Intercom Volume Control (1)
The smaller inner volume control knob adjusts the loudness of the intercom for the pilot and copilot. It has
no effect on selected radio levels, music input levels or passengers' volume level. The green volume bar
indicator shows the level of the crew volume by default.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
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200-450-0000 Page 3-7 Rev. 3, November 2014
The outer, larger volume control knob controls intercom volume for the passengers. It has no effect on ra-
dio or music levels. When the outer knob is moved, the green volume bar indicator will switch to show the
level of the passenger’s intercom volume, reverting to the crew after a few seconds.
Adjust the radios (at the radio itself) 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
individual headset.
3.8.2.1 Monaural headsets
The pilot and copilot positions work with stereo or mono headsets. However, IntelliAudio will not be pre-
sented correctly unless stereo headsets are used, and oriented correctly on the head, left and right.
NOTE: For the full effect of IntelliAudio® Dimensional Sound, stereo headsets must be used, and the
left/right orientation observed.
All passenger headsets are connected in parallel. Therefore, if a monaural headset is plugged in to a
PMA450 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.
NOTE: Mono headsets that short the tip and ring (i.e. older models) will introduce some audio dis-
tortion when used. Modern, stereo headsets are recommended in all positions.
3.8.3 Intercom Modes (8)
The “ICS” pushbutton switch on the panel provides the selection of the three intercom modes. The descrip-
tion 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 by the ICS button selecting CRW.
This button cycles through the intercom modes, from left to right, then right to left as: ISO, ALL CRW and
CRW, ALL, ISO. A green indicator 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’ inter-
com and Music, while passengers will hear copilot intercom and Music. Neither will hear aircraft radio
receptions or pilot transmissions. The pilot can hear music if desired. See §3.9.3
ALL: All parties will hear the aircraft radio and intercom. Crew and passengers will hear selected Music.
During any radio or intercom communications, the music volume automatically decreases. The music vol-
ume 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 Music 1. Passengers can continue to communicate with themselves without
interrupting the Crew and may listen to Music as configured.
3.8.3.1 Alternate Intercom Mode
The PMA450 includes an Alternate Intercom Mode. This mode allows intercom communications between
crew and passengers, without interrupting the crews radio communications. The passengers do not hear the
aircraft radio audio. The passenger microphones are muted, such that the crew cannot hear the passengers’
microphone audio while the radio is active. Passengers can still talk to each other.
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Installation and Operator’s Manual
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PMA450 Audio Selector Panel and Intercom System
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To enable the Alternate Intercom Mode, press RADIO Intercom: to toggle between Standard and Alternate
modes. This state is remembered during power cycles.
3.9 Music and Music Muting
The PMA450 has two independent music inputs at the rear connector, and a front panel jack. The PMA450
also has the ability to receive streaming music from a Bluetooth-enabled device which will be connected
into Music #1.
The Music 1 and Music 2 inputs can be selectively delivered to the pilot, copilot and/or passengers using
the music distribution menu.
Streaming Bluetooth® Music is in parallel with Music 1
Figure 3-4 Top Music Menu
Press Music → Music Distribution→ and select desired combination.
Figure 3-5 Music distribution menu
NOTE:
All music devices should be turned off for takeoff, landing, or any critical phase of flight. FAA Regulation
14 CFR 91.21 restricts the use of portable electronic devices.
§91.21 “(a) Except as provided in paragraph (b) of this section, no person may operate, nor may any opera-
tor or pilot in command of an aircraft allow the operation of, any portable electronic device on any of the
following U.S.-registered civil aircraft. . .
“(b)(5) Any other portable electronic device that the operator of the aircraft has determined will not cause
interference with the navigation or communication system of the aircraft on which it is to be used.”
You can refer to Advisory Circular 91.21-1A for more information, at http://www.faa.gov
PS Engineering
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200-450-0000 Page 3-9 Rev. 3, November 2014
3.9.1 Music Muting
The SoftMute™ circuit will mute the music whenever there is conversation on the radio, the intercom, or
both, depending on the “Mute” mode selected. When that conversation stops, the music returns to the pr e-
vious level comfortably, over a second or so.
The mute mode functions are controlled through Music Mute Menu which has three modes for each music
input. Mute ALL, Karaoke & Radio Mute.
The PMA450 always defaults to Mute ALL when turned on.
In Mute- music will mute with either intercom or radio
“Karaoke” mode - music will not mute except during radio transmissions.
Radio (Rad) Mute - Radio will mute music, but intercom will not mute music.
In addition to the panel mute menu, a remote switch may be installed to allow the passengers local access
to their Karaoke mode. When this switch is grounded, the menu choice is overridden.
3.9.2 Music Volume
The volume of the music inputs can also be adjusted from the menu of the PMA450:
Press Music → Music Volume → Desired music input. The LED Volume bar and the numeric volume will
show the volume level.
Figure 6 – Music Volume screen
3.9.3 Music in Pilot ISO mode
When the isolate (ISO) mode is activated, the music for the pilot is automatically disabled. If desired, the
pilot can elect to hear Music #1, in the ISO mode by selecting through the menu screen.
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200-450-0000 Page 3-10 Rev. 3, November 2014
The pilot can select either music source from the Music distribution menu.
3.10 Bluetooth® connection
The PMA450 has a Bluetooth interface. The audio panel is always “discoverable,” so you just need to
search for the PMA450 from your Bluetooth-equipped phone or music source. The default access code is
0000, if needed. Once the PMA450 has been “paired” with your Bluetooth device, the TEL distribution will
act as described in § 3.11.1.
When Bluetooth is active, a Bluetooth icon and the battery status of the device is displayed in the upper
right corner of the home display.
3.10.1 Pairing and unpairing Bluetooth devices
The PMA450 can be paired with up to eight individual devices. When that number is exceeded, the
PMA450 will randomly drop a device to allow the new device to be added.
Hint, if your old phone is not recognized by the PMA450, you may need to reset from the Bluetooth menu.
3.10.1.1 Paring separate music and telephone devices
It is possible to use a different music source (iPad, iPod with Bluetooth adapter, Bluetooth enabled laptop,
etc) and telephone. However, only one music source can be streaming at a time.
3.11 Bluetooth® Telephone Mode
The PMA450 serves as a full duplex interface for telephone systems such as portable cellular phones with
Bluetooth connectivity.
Warning:
United States FCC Regulations contained in 47 CFR § 22.925 currently contain prohibition on airborne
operation of cellular telephones. “Cellular telephones installed in or carried aboard airplanes, balloons or
any other type of aircraft must not be operated while such aircraft are airborne (not touching the ground).
When any aircraft leaves the ground, all cellular telephones on board that aircraft must be turned off.”
In ALL intercom mode, all crew and passengers will be heard on the phone when they speak. All will hear
selected audio. Com audio is automatically heard in the headsets.
In CREW mode, the pilot and copilot are connected to the telephone. The pilot and copilot will have
transmit capability on the other selected transceiver Com 1 or 2, simply by using their respective PTT
switch.
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200-450-0000 Page 3-11 Rev. 3, November 2014
In ISO intercom mode, when the PMA450 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.
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. Intercom conversations will still be present if the cell phone provides
sidetone, or if the audio panel is modified for telephone sidetone.
PS Engineering does not guarantee compatibility with personal cellular telephones.
3.11.1 Cellular telephone sidetone
Some cell phones do provide sidetone, and when combined with unit sidetone can cause audio distortion. In
PMA450 Telephone sidetone can be enabled or disabled on the Telephone menu when a call is active.
3.12 Internal Recorder and playback
The PMA450 comes equipped with an internal recorder. This digital system stores the last incoming audio
from the radio you have selected for transmit. It can store as many of 8 incoming messages, and up to 45
seconds of audio. The pilot and copilot hear the playback.
Recording is automatic. To play back the last recorded message, press and hold the COM Receive pushbut-
ton associated with the selected radio transmitter for about one (1) second. You can either wait for the mes-
sage to finish playing before accessing the prior message, or cancel the current playback and step back-
ward. To cancel the playback, press and hold the COM receive playback button for two seconds (2). The
next time the button is pressed for one (1) second, the next earlier message will be heard. The playback
will stop whenever there is more incoming selected com audio, and the message can be replayed
from the beginning by pressing the selected Com Receive button again for 1 second.
Figure 3-7 Playback Controls
Figure 3-8 Playback Display
PS Engineering
Installation and Operator’s Manual
NOTE
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Page 3-12 Rev. 3, November 2014
3.13 User Setup menus
The PMA450 has several user adjustable functions accessible from a setup menu.
Figure 3-9 User Configuration Menu
During the unit boot up process, hold the lower line select button until the setup screen appears.
Cycle the PMA450 power to exit setup screen.
During the unit boot up process, hold the lower line select button until the setup screen appears. This shall
place the unit into the “User Configurable Mode- home screen”. This allows adjustment for:
Adjust Screen (LCD)
Rename Switched Inputs
Bluetooth
Cycle the PMA450 power to exit setup screen.
3.14 LCD Adjustment
The first items are adjustments to the Liquid Crystal Display, allowing the installer or user to tailor the contrast and backlight intensity to suit the cockpit conditions.
There are two modes: LCD Brightness & LCD Contrast.
LCD will vary in real time while adjustments are made. LED bar & numeric indication will vary.
Adjusting either the Brightness or Contrast level requires selecting either of the two smaller buttons and
then turning the inner knob. Counter clockwise to lower the number (level of Brightness & Contrast) and
clockwise to increase the number (level of Brightness & Contrast).
To change the display:
Press the line select for the desired item
Turn the small, inner knob to change the contrast or brightness as desired.
Cycle the PMA450 power to exit setup screen.
Figure 3-10 LCD Menu
3.14.1 Display Timeout
This is a feature that allows the end user to adjust how quickly the screen menus timeout (revert to main
menu).
This allows adjustment of the timeout screen and can be configured from 1 second to 30 seconds by turning
the inner knob.
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Installation and Operator’s Manual
200-450-0000 Page 3-13 Rev. 3, November 2014
For a user whom is unfamiliar with the product, this will give them enough time to learn the system. After
becoming more familiar the user can speed up the menu screen timeout as desired.
Cycle the PMA450 power to exit setup screen.
Figure 3-11 Display Timeout Menu
3.14.2 Rename “Switched” Inputs
The system is factory set to default as ADF, DME & AUX as shown.
The three inputs are from top to bottom:
Switched input #1 J1, Pin 7 wrt Pin 8 (Default ADF)
Switched input #2 J1, Pin 21 wrt Pin 22 (Default DME)
Switched input #3 J1, Pin 23 wrt Pin 43(Default AUX)
The customer will have access to rename. Maximum 9 letters per line and A thru Z & 0 thru 9 will be available. Note: If no marker version PMA450 (-0200) an external marker can be connected to these inputs.
Press the line select for desired input.
Turn the large outer knob to select the letter to change.
Turn the small, inner knob to increment or decrement the letter.
You can select 9 characters, A through Z, 1 through 9.
You can quickly clear the whole line by turning the outer knob to move the cursor all the way to
the right until the line clears.
Cycle the PMA450 power to exit setup screen.
Figure 3-12 Rename Input Menu
3.14.3 Bluetooth Setup
There are three Bluetooth functions that can be changed in the user setup screen, Unpair All, Paring PIN,
and device ID.
When Unpair All is pushed, all Bluetooth devices are erased from the audio panel, and can then be added
back as desired. This is useful in some cases where the unit or operator lose track of the devices paired, and
cannot get them to connect.
Pair: The 4 digit pass code can be changed to any number desired. This is useful if the owner wants to restrict access to the audio panel Bluetooth functions.
ID: The PMA450 can be renamed using this mode to show up on the devices with a personalized identifier.
3.15 USB Charging Port (10)
The PMA450 contains a USB charging port that is capable of providing 5 VDC, 10 watts to charge the batteries in smart phones and tablets used as Personal Electronic Devices. This is NOT a data transfer jack.
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Section IV – Warranty and Service
4.1 Warranty
In order for the factory warranty to be valid, the installations in a certified aircraft must be accomplished by
an FAA-(or other ICAO agency) certified avionics shop and authorized PS Engineering dealer. If the unit
is being installed by a non-certified individual in an experimental aircraft, a factory-made intercom harness
must be used for the warranty to be valid.
PS Engineering, Inc. warrants this product to be free from defect in material and workmanship for a period
of two (2) years from the date of sale. During the first twelve (12) months of the two-year warranty period,
PS Engineering, Inc., at its option, will send a replacement unit at our expense if the unit should be determined to be defective after consultation with a factory technician. For the remaining twelve (12) months of
the two-year warranty period, PS Engineering, Inc., at its option, will send a similar replacement unit at the
customers’ expense if the unit should be determined to be defective after consultation with an authorized
PS Engineering dealer.
All transportation charges for returning the defective units are the responsibility of the purchaser. All domestic transportation charges for returning the exchange or repaired unit to the purchaser will be borne by
PS Engineering, Inc. The risk of loss or damage to the product is borne by the party making the shipment,
unless the purchaser requests a specific method of shipment. In this case, the purchaser assumes the risk of
loss.
This warranty is not transferable. Any implied warranties expire at the expiration date of this warranty. PS
Engineering SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. This
warranty does not cover a defect that has resulted from improper handling, storage or preservation, or unreasonable use or maintenance as determined by us. This warranty is void if there is any attempt to dissemble this product without factory authorization. This warranty gives you specific legal rights, and you may
also have other rights, which may vary from state to state. Some states do not allow the exclusion of limitation of incidental or consequential damages, so the above limitation or exclusions may not apply to you.
All items repaired or replaced under this warranty are warranted for the remainder of the original warranty
period. PS Engineering, Inc. reserves the rights to make modifications or improvements to the product
without obligation to perform like modifications or improvements to previously manufactured products.
4.2 Factory Service
The units are covered by a two-year limited warranty. See warranty information. Call PS Engineering, Inc.
at (865) 988-9800 before you return any unit. This will allow the service technician to provide any other
suggestions for identifying the problem and recommend possible solutions.
After discussing the problem with the technician and you obtain a Return Authorization Number, ship
product to:
PS Engineering, Inc.
Attn: Service Department
9800 Martel Rd
Lenoir City, TN 37772
(865) 988-9800 FAX (865) 988-6619
Email: support@ps-engineering.com
Units that arrive without an RMA number, or telephone number for a responsible contact, will be
returned un-repaired. PS Engineering is not responsible for items sent via US Mail.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Appendix A Rev. 3, November 2014
Appendix A – PMA450 Installation Drawings
J2 J1
Viewed from Back
15
30
44
1
16
31
15
30
44
1
16
31
Ground Lug
Ground Lug
475-440-0001 (x2)
Back plate assy
475-009-0001
ground lug (x2)
475-440-0001 (x2)
Screw w/washer
Ground lug detail
Rear plate detail (not to scale)
0.37in
3.87in
5.53in
6.04in
0.36in
0.96in
1.28in
6.31in
1.28in
Caution: Apply steady pressure to the bezel while screwing the unit into the tray to
ensure even seating of the unit and connectors.
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Appendix B Rev. 3, November 2014
Appendix B – J1 Connector Interconnect
Com 1 Audio Hi
Com 1 Mic Key
Com 1 Lo
Communications
Transceiver #1
Communications
Transceiver #2
Nav 1 Audio Hi
Nav 1 Audio Lo
VHF Nav 1
Nav 2 Audio Hi
Nav 2 Audio Lo
VHF Nav 2
SW2 Audio Hi
SW2 Audio Lo
Unswitched Input #1 Hi
Unswitched Audio Lo
Unswitched Audio #1
Unswitched Input #2 Hi
Unswitched Audio Lo
Unswitched Audio #2
Pilot Mic Audio Hi
Pilot Mic PTT
Pilot Mic Lo
36
37
38
39
MKR Ant.
1
2
RG-58A/U Coax
9
10
11
12
Com 1 Mic Audio Hi
Com 2 Audio Hi
Com 2 Mic Key
Com 2 Lo
13
14
15
30
Com 2 Mic Audio Hi
17
18
19
20
21
22
31
32
44
43
33
34
35
SW1 Audio Hi
SW1 Audio Lo
SW Rcvr 1
7
8
Notes:
1. All shields should be grounded at audio panel only.
Other end remains floating.
2. All Power, and Ground wires shall be #22 gage wire
Lighting #22 AWG, other wires minimum #24 AWG
3. All mic and headphone jacks must be isolated from ground.
4. Speaker loads may be required on some older transceivers.
Consult manufacturer's information.
5. All shielded wires must be MIL 22750 or 27500.
6. Unswitched inputs 1, is always presented to speaker
and crew headphones, regardless of SPR switch or PTT.
7. COM active output provides a logic low when there
is activity on COMs or other selected audio. This is used to prioritze
audio warnings in some systems.
8. No connection to pins 3, 4, 5, 6, 16, 25, 26, 27, 28
9. Up to 3 switched reveiver inputs are available, and can be renamed
in the set up menu. See Sect.3.14.2
10. Unswitched #3 & #4 are adjustable
11. Unswitched #1 & #2 is selectable over the speaker See 2.4.8
Pilot PTT
PMA450 Connector, J1 (Sub-D 44-pin, male on tray)
Unswitched Input #3 Hi
Unswitched Audio Lo
Unswitched Audio #3
29
See Note 6, 10 & 11
Pass. Phones (R)
Pass Phones (L)
Pass. Phones Lo
Pass. 1 PhonesJack
Pass. 4 Phones Jack
Ext. Marker Lamp (Blue)
Ext. Marker Lamp (White)
Ext. Marker Lamp (Amber)
MM Sense Output
White Lamp Output
Blue Lamp Output
Amber Lamp
MM Sense
Ext. Marker Annunciator
Pass. 3 Phones Jack
Pass. 2 Phones Jack
24
COM Active Output
See Note 7
SW3 Audio Hi
SW3 Audio Lo
23
41
40
42
See Note 9
SW Rcvr 2
SW Rcvr 3
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Appendix C Rev. 3, November 2014
Appendix C – J2 Connector Interconnect
22
20
31
16
1
35
36
24
23
25
4
3
2
Copilot Phones (R)
Copilot Phones (L)
Copilot Phones Lo
Pass. 1 Mic Jack
Pass. Mic Lo
Pass. Mic Hi
37
38
Pass. 2 Mic Jack
Pass. Mic Lo
Pass. Mic Hi
39
40
Pass. 3 Mic Jack
Pass. Mic Lo
Pass. Mic Hi
41
42
Pass. 4 Mic Jack
Pass. Mic Lo
Pass. Mic Hi
32
33
34
Copilot Mic Audio
Copilot PTT
Copilot Mic Lo
Copilot PTT
Copilot Mic Jack
14
13
Ent. #2 Mute
12
Playback
PMA450 J2 CONNECTOR
(Sub-D 44-pin male on tray)
Ent. #2 Input
27
26
28
Ent. #2 Audio (R)
Ent. #2 Audio (L)
Ent. #2 Audio Lo
19
________
PA
Active
Note 8
Notes:
Ent. #1 Audio (R)
Ent. #1 Audio (L)
Ent. #1 Audio Lo
Ent. #1 Input
5
6
7
Copilot PhonesJack
Pilot Phones (R)
Pilot Phones (L)
Pilot Phones Lo
Pilot PhonesJack
14/28 Volt Lights Hi
14 V Lights Hi/28V Lights lo
Lights Lo
8
9
Ground Lug
Airframe Ground
11-33 VDC
See Note 4
PA Mute
18
29
30
Speaker Hi
Speaker Lo
44
43
Swap
Switch
Swap
10
11
Cockpit Speaker
1. All Power,and Ground wires must be #22 gage wire
Lighting#22 AWG, other wires minimum#24 AWG.
2. All shields should be groundedat audio panelonly,
otherend remains floating
3. Pins 8 and9 connected through a 5 A breaker.
4. PA Mute trigger is a TTL levellogic output that is pulled
low whenPTT active for add-on Public Address systems.
5. All shieldedwires must be MIL 22750 or 27500.
6. Optional switch to remotelyactivate playback
7. For music distribution information, see Sections2.5.1 & 3.9
8. Pin 19 is switchedto ground when the PAmode is activated,
placingpilot microphoneon speakeroutput while pilot PTT active.
SeeSect 2.4.10.2.
9. AUX enable goes low when SW#3 is selected.
ShouldNOT be used when audio source is installed and played
throughSW3
10. S/N D 01150 and below ONLY:
Grounding Pin 30 places MarkerReceiver intoHI sensitivity
11. No connection to Pin 17, 29.
12. Use care when connecting music signal and ground inputs.
Refer to section2.5.1 for more information.
Failureto properly interfacemusic can resultin
addednoise.
13. Unswitched4 audio low connected to copilot or
pilot phonelow as convenient,
but shouldNOT go to music low
14. This switch toggles Music 2 mute on and off.
Unswitched Input #4 Hi
Unswitched Audio Lo
Unswitched Audio #4
15
See Note 9
7
6
5
28 V Lights Hi
28-Volt lights lo
7
6
5
14 V Lights Hi
14-Volt lights lo
AUX Enable
See Note 14
5A Breaker
See Note 3
Note 6
Note 12
Note 13
NO CONNECT
Note 10
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Appendix D Rev. 3, November 2014
Appendix D – Instructions for FAA Form 337 and continuing air-
worthiness
8.1 Instructions for FAA Form 337, Audio Panels
One method of airworthiness approval is through an FAA Form 337, Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance) In the case of the PMA450, you may use the following text as a guide.
Installed audio selector and 6-place intercom, PS Engineering PMA450, part number 050-450-(XXXX) in ( location ) at
station . Installed per AC43.13-2, Chapter 2, paragraph 23 (Instrument Panel Mounting). Installed per PS Engineering
Installation Operators Manual p/n 200-450-(XXXX), revision (), dated ( ).
These units are FAA-Approved under TSO C139A for audio amplifiers, and/or TSO C35d for Marker Beacon Receivers,
C71 for DC power supply and meets environmental qualifications outlined in RTCA DO-160G as appropriate or this aircraft.
Interface to existing aircraft radios in accordance with installation manual and in compliance with practices listed in
AC43.13-2, Chapter 2. All wires are Mil-Spec 22759 or 27500. Connection to aircraft dimmer bus is
____________________. Power is supplied to the unit through a 3A circuit breaker (type and part number), and total
electrical load does not exceed % of the electrical system capacity with the PMA450 added.
Aircraft equipment list, weights and balance amended. Compass compensation checked. A copy of the operation instructions, contained in PS Engineering document 202-450-( ), revision ( ), dated ( ), is placed in the aircraft records. All work
accomplished listed on Work Order .
8.2 Instructions for Continuing Airworthiness, Audio System
Sample ICA Checklist for PS Engineering Audio System:
Section
Item
Information
1
Introduction
Installation of audio control panel with integrated marker beacon receiver and
intercommunications system.
2
Description
Installation as described in manufacturer’s installation manual referenced on
FAA Form 337, including interface with other avionics audio as required.
3
Controls
See installation and operator’s guide referenced on FAA Form 337.
4
Servicing
None Required
5
Maintenance Instructions
On Condition, no special instructions
6
Troubleshooting
In the event of a unit problem, place the unit into “off,” “fail-safe” and/or
“emergency” mode. This allows pilot communications using COM 1. Follow
checkout instructions in the installation manual referenced on the FAA Form
337. For a specific unit fault, contact the manufacturer at (865) 988-9800 for
special instructions.
7
Removal and replacement information
Removal: Using a 3/32” Allen-head wrench, carefully unscrew the locking
screw located in the center of the unit. While turning the wrench CCW, gently
pull on the EDGES of the bezel until the unit is free from the mounting tray.
Installation: Engage the locking screw at the back. Turn the locking screw CW,
while applying slight pressure to the edges of the bezel. Do not over tighten!
8
Diagrams
Not applicable
9
Special Inspection Requirements
Not Applicable
10
Protective Treatments
Not Applicable
11
Structural Data
Not Applicable
12
Special Tools
None
13
Not Applicable
Not Applicable
14
Recommended Overhaul Periods
None
15
Airworthiness Limitations
Not Applicable
16
Revision
To be determined by installer
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000 Appendix E Rev. 3, November 2014
Appendix E – RTCA DO160G Environmental Qualification Form
Audio Selector Panel/Intercom/Marker Beacon Receiver
Part Number: 050-450-( )
FAA TSO Number: C139a, C35d, C71
Manufacturer: PS Engineering Incorporated 9800 Martel Road Lenoir City TN 37772
Conditions
Section
Conducted Tests
Temperature and Altitude
Low Temperature
High Temperature
In-flight Loss of Cooling
Altitude
Decompression
Overpressure
4.0
4.5.1
4.5.2
4.5.4
4.6.1
4.6.2
4.6.3
Equipment tested to CAT A1 & D1
-55° C Survival, -15°C Low Operating (A1)
+85°C Survival, +70°C High Short Time Operating
Not Applicable, no cooling required
50,000’ unpressurized (D1)
Not Applicable
Not Applicable
Temperature variation
5.2
Equipment tested to Category C
Humidity
6.0
Equipment tested to Category A
Shock
7.0
Equipment tested to Operational test only
Operational
7.2
Equipment tested to Operational test only
Crash Safety
7.3
Equipment tested to Operational test only
Vibration
8.0
Equipment tested to Category M & N
Explosion
9.0
Category X, not tested
Waterproofness
10.0
Category X, not tested
Fluids Susceptibility
11.0
Category X, not tested
Sand and Dust
12.0
Category X, not tested
Fungus
13.0
Category X, not tested
Salt Spray
14.0
Category X, not tested
Magnetic Effect
15.0
Equipment tested to Category Z
Power input
16.0
Equipment tested to Category B
Voltage Spike
17.0
Equipment tested to Category A
Audio Frequency Susceptibility
18.0
Equipment tested to Category B
Induced Frequency Susceptibility
19.0
Equipment tested to Category A
Radio Frequency Susceptibility
20.0
Equipment tested to Category T
Radio Frequency Emission
21.0
Equipment tested to Category B
Lightning Induced Transient Susceptibility
22.0
Equipment tested to Category XXE2
Lightning Direct Effects
23.0
Category X, not tested
Icing
24.0
Category X, not tested
ESD
25.0
Category X, not tested
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