PS Engineering PMA6000, S, M, M-S, C, S-C, M-C, M-S-C Audio Selector Panel Installation Manual
Below you will find brief information for Audio Selector Panel PMA6000 PMA6000, Audio Selector Panel PMA6000 PMA6000S, Audio Selector Panel PMA6000 PMA6000M, Audio Selector Panel PMA6000 PMA6000M-S. This device provides a six-station VOX intercom system and audio selector panel, capable of switching three transceivers and six receivers. It includes features for the cabin speaker, and two entertainment inputs. The PMA6000 features a fail-safe mode that connects the pilot headphone and microphone to COM 1 if power is removed or the Mic Selector switch is turned off.
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0001
9800 Martel Road
Lenoir City, TN 37772
PMA6000
PMA6000M
PMA6000C
PMA6000M-C
PMA6000S
PMA6000M-S
PMA6000S-C
PMA6000M-S-C
Audio Selector Panel and
High-fidelity Stereo Audio Selector Panel
Intercom System
Installation and Operation Manual
FAA-Approved
TSO C35d
TSO C50c
Page i Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Document P/N 200-066-0001
Revision 1 April 1998
PS Engineering, Inc. 1998 ©
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 (423) 988-9800
200-066-0001 Page ii Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Table of Contents
1. Section I GENERAL INFORMATION .................................................................. 1-1
1.1 INTRODUCTION.............................................................................................. 1-1
1.2 SCOPE............................................................................................................... 1-1
1.3 EQUIPMENT DESCRIPTION .......................................................................... 1-1
1.4 APPROVAL BASIS - FAA ................................................................................ 1-3
1.5 SPECIFICATIONS ............................................................................................ 1-3
1.6 EQUIPMENT SUPPLIED ................................................................................. 1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED ........................................... 1-5
1.8 LICENSE REQUIREMENTS ............................................................................ 1-5
2. Section II -Installation ............................................................................................. 2-1
2.1 GENERAL INFORMATION ............................................................................. 2-1
2.1.1 SCOPE ........................................................................................................ 2-1
2.2 Unpacking and Preliminary Inspection ................................................................ 2-1
2.3 Equipment Installation Procedures ...................................................................... 2-1
2.3.1 Cooling Requirements .................................................................................. 2-1
2.3.2 Mounting Requirements ............................................................................... 2-2
2.3.3 Mounting Rack Installation .......................................................................... 2-2
2.3.4 Connector Assembly .................................................................................... 2-2
2.4 Cable Harness Wiring ......................................................................................... 2-2
2.4.1 Noise ........................................................................................................... 2-3
2.4.2 Entertainment Input ..................................................................................... 2-3
2.4.3 External Push-to-Talk .................................................................................. 2-4
2.4.4 Transmit Interlock........................................................................................ 2-5
2.4.5 Power .......................................................................................................... 2-5
2.4.6 Existing KMA-24 Installation....................................................................... 2-5
2.4.7 "Swap" Mode .............................................................................................. 2-5
2.4.8 Backlighting................................................................................................. 2-5
2.4.9 PA Mute ...................................................................................................... 2-6
2.4.10 Intercom .................................................................................................... 2-6
2.5 Adjustments........................................................................................................ 2-6
2.6 Marker Antenna Installation................................................................................ 2-6
2.7 Communications Antenna Installation Notes ....................................................... 2-7
2.8 Unit Installation .................................................................................................. 2-7
2.9 Post Installation Checkout .................................................................................. 2-7
2.9.1 Operational Checkout, 6000, 6000S, 6000M, 6000M-S ............................... 2-7
2.9.2 Operational Checkout, 6000C, 6000M-C and 6000M-S-C ........................... 2-8
2.10 Final Inspection. ............................................................................................... 2-9
3. Section III OPERATION ...................................................................................... 3-1
3.1 SCOPE............................................................................................................... 3-1
3.2 Audio Selector (All models)................................................................................ 3-1
3.2.1 Speaker Amplifier ........................................................................................ 3-1
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
3.3 Mic Selector Switch (Fail Safe Operation) .......................................................... 3-2
3.3.1 Mic Selector Switch, Com 3 (6000C, 6000MC 6000SC and 6000MSC only)..................... 3-2
3.3.2 Swap Mode (Switch from Com 1 to Com 2 remotely) .................................. 3-2
3.4 Split Mode (6000, 6000M, 6000S, 6000MS) ...................................................... 3-3
3.5 Split Mode (6000C, 6000MC, 6000SC, 6000MSC) ............................................ 3-3
3.6 Intercom............................................................................................................. 3-3
3.6.1 Volume Control, Monaural (6000, 6000M, 6000C, 6000MC) ...................... 3-3
3.6.2 Volume Control, Stereo, (6000S, 6000MS, 6000SC, 6000MSC) ................. 3-3
3.6.3 Adjusting the VOX-Squelch control, Monaural (6000, 6000M, 6000MC) .... 3-4
3.6.4 Adjusting the VOX- Squelch control, Stereo (6000S, 6000MS, 6000SC
6000MSC)............................................................................................................ 3-4
3.6.5 Intercom Modes (All versions) ..................................................................... 3-4
3.7 Marker Beacon (PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-S-C)3-6
3.7.1 Middle Marker Sense ................................................................................... 3-7
3.7.2 External Marker Lights (6000, 6000S, 6000C, 6000SC)............................... 3-7
3.7.3 Receiver Sensitivity...................................................................................... 3-7
4. Section IV- Warranty and Service......................................................................... 4-1
4.1 Warranty ............................................................................................................ 4-1
4.2 Factory Service................................................................................................... 4-1
5. Appendix A External PTT Hook Up ...................................................................... A
Bottom Connector wiring, PMA 6000, PMA 6000M, PMA6000-C, PMA6000M-C .......
..................................................................................................................... Appendix B
Bottom Connector wiring, PMA 6000S, PMA 6000MS, PMA6000S-C
PMA6000M-S-C........................................................................................... Appendix C
Top Connector wiring, PMA 6000, PMA 6000M, PMA6000-C, PMA6000M-C.............
..................................................................................................................... Appendix D
Top Connector wiring, PMA 6000S, PMA 6000MS, PMA6000S-C, PMA6000M-S-C ...
......................................................................................................................Appendix E
Instructions for Continuing Airworthiness .................................................Appendix F
Example of FAA Form 337 ......................................................................... Appendix G
Table of Figures
Figure 1-1 PMA 6000 Mono units ................................................................................ 1-2
Figure 1-2 PMA 6000S Stereo units ............................................................................. 1-2
Figure 1-3 PMA6000SC Stereo w/Com 3..................................................................... 1-2
Figure 2-1 Adjustments ................................................................................................ 2-6
Figure 3-1 Audio Selector ............................................................................................ 3-1
Figure 3-2 Mic Selector................................................................................................ 3-2
Figure 3-3 Volume Controls Mono............................................................................... 3-3
Figure 3-4 Volume Control Stereo................................................................................ 3-3
Tables
Table 3-1 Intercom Modes ........................................................................................... 3-6
200-066-0001 Page iv Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
1. Section I
GENERAL INFORMATION
1.1 INTRODUCTION
The PMA6000 family of Audio Selector Panels are revolutionary products. Never before has there been so much capability and utility in such a compact package. These units are designed for ease of use and installation, as well as to facilitate cockpit resource management and improve passenger entertainment.
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.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA6000-series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model Description Part Number
PMA6000 Audio Selector Panel 6000
PMA6000S
PMA6000M
PMA6000M-S
PMA6000C
Stereo Audio Selector Panel
Stereo Audio Panel with Marker
Audio Panel with Com 3
6000S
Audio Selector Panel with Marker Receiver 6000M
6000MS
6000C
PMA6000S-C
PMA6000M-C
PMA6000M-S-C
Stereo Audio Selector Panel with Com 3 6000SC
Audio Panel w/MKR and Com 3 6000MC
Stereo Audio Panel w/MKR and Com 3 6000MSC
Where the functions are identical to all units, it will be referred to herein as a PMA6000.
Otherwise, the applicable units will be specified.
1.3 EQUIPMENT DESCRIPTION
The PMA6000-series is a state of the art audio isolation amplifier and audio selector that contains a voice activated (VOX) intercom system. It can switch up to three transceivers
(Com 1, Com 2 and TEL) and six receivers (Nav 1, Nav 2, ADF, DME, MKR and AUX).
In addition, there are two unswitched inputs, for telephone ringer and altimeter warning.
Push buttons select the receiver audio source provided to the headphones. A SPR button allows the user to listen to the receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker audio is muted during transmit. A rotary switch selects one of the three transceivers for the pilot and copilot position in transmit. In "Split Mode" the
PMA6000 has the ability to allow the pilot and copilot to operate different transmitters independently and simultaneously.
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PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any reason, or if the Mic Selector switch is turned to the Off position.
A six-station voice activated (VOX) intercom is included in the PMA6000. pilot isolate and crew modes, two mono (or stereo depending on unit) music inputs with "Soft Mute," and a 2-color Light Emitting Diode for power and transmit indications. Intercom control is through front panel mounted knobs. Monaural units have a dual concentric knobs that control pilot volume and intercom squelch, and copilot/passenger volume and squelch. In the stereo versions, there is a single volume and squelch control for all on board.
An optional 3-light Marker Beacon receiver is integral to the PMA6000M, PMA6000MS
PMA6000MC and PMA6000M-S-C. This provides the necessary Marker Beacon light and audio indications necessary for an Instrument Landing System (ILS) approach.
Figure 1-1 PMA 6000 Mono units
Figure 1-2 PMA 6000S Stereo units
com 3
Figure 1-3 PMA6000SC Stereo w/Com 3
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
1.4 APPROVAL BASIS - FAA
TSO Approval.
The PMA6000, PMA6000S, PMA6000C and PMA6000S-C Audio Selector Panels are
FAA approved under TSO C50c (Audio Amplifiers).
The PMA6000M, PMA6000M-S, PMA6000M-C, and PMA6000M-S-C are FAA approved under TSO C50c and TSO C35d (Marker Beacon Receivers).
All systems comply with RTCA DO-143, DO-160b and DO-170.
Operation is subject to the following conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired operation.
1.5 SPECIFICATIONS
GENERAL SPECIFICATION
Marker Beacon:
CHARACTERISTIC TSO COMPLIANCE:
C35d, Class A
Audio Selector/Intercom: C50c, Class A
APPLICABLE DOCUMENTS: RTCA DO-160b, RTCA DO-170 and RTCA DO-143
ENVIRONMENTAL Qualifications: A1D1/CAMXXXXXXXBBBBAAX
Temperature Range:
Operating: -20C to 55C Storage: -40C to 85C
Altitude: Up to 50,000 feet in an unpressurized area of the cockpit.
DIMENSIONS: Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm) Depth: 6.8 in. (17.3
cm)
WEIGHT (With Rack & Connectors) : 0.8 Lb. (0.36 kg.)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage: 13.75 or 27.5 VDC*
Maximum Current:
Typical operating current:
1 Amp (Externally protected by a 2 Amp circuit breaker.) speaker off: 350 mA speaker on: 600 mA
NOTICE: To reduce the amount of heat dissipated in the audio selector panel, when used in a 28 Volt aircraft, it is suggested that the 15
Ω
, 15 Watt dropping resistor (P/N 701-015-1501) be installed in series with the power input.
Audio selector panel input impedance: 510
Ω
Input Isolation: -70 dB (min.)
Speaker Muting:
Speaker Output (into 4
Ω
):
-60 dB (min.)
3 Watts (min.) with no clipping
Switched Receiver Inputs: 8
(Com 1, Com 2, Nav 1, Nav 2, ADF, DME, MKR, AUX)
Unswitched Inputs:
(TEL Ringer, Altimeter DH)
2
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Transmitter Selections: 5
(Com 1, Com 2, Com1/2, Com2/1, TEL/Com1) on PMA6000, PMA6000S, PMA6000M, PMA6000M-S
(Com 1, Com 2, Com1/2, Com2/1, Com 3) on PMA6000C, PMA 6000S-C, PMA6000M-C, PMA6000M-S-C
Speaker Impedance: 4
Ω
Headphone Impedance: 150 - 1000
Ω
Headphone Output:
Microphone Impedance:
45 mW each headset with no clipping
150 - 600
Ω
Intercom Positions: 6 places
Music Inputs: 2 (Stereo)
Music Muting: >50 dB "Soft Mute" when Com or intercom active.
Distortion: <1% THD @ 45 mW into 150
Ω
@ 70 mW into 150
Ω
Mic Freq. Response, 3 dB:
350 Hz - 6000 Hz
Music Freq. Response, 3 dB: 200 Hz - 15 kHz
MARKER BEACON RECEIVER:
(PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-S-C Only)
Frequency: 75 MHz Crystal Controlled
Sensitivity:
Selectivity:
Low:
High:
External Lamp Output:
450
µ
Volts (Hard)
Factory adjusted to 1400
µ
V (Soft)
160
µ
Volts (Hard)
Factory adjusted to 150
µ
V (Soft)
-6 dB at 110 kHz -40 dB at 120 kHz
9.0 (+/- 0.5) VDC
MM Sense: positive when active, max. current 125 mA
Active high (4.7 VDC +/- 0.5V) during Middle Marker acquisition, for autopilot use.
1.6 EQUIPMENT SUPPLIED
A.
1 ea. of the following units:
Model
PMA6000
PMA6000S
PMA6000M
PMA6000M-S
PMA6000C
PMA6000S-C
PMA6000M-C
PMA6000M-S-C
Part Number
6000
6000S
6000M
6000MS
6000C
6000SC
6000MC
6000MSC
200-066-0001 Page 1-4 Rev. 1, April 1998
B.
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
PMA6000 Installation Kit: 250-006-002
Part Number
001-006-0001
655-000-0001
701-015-0015
200-066-0000
Description
Tray with (2) 44 Pin Connectors
Gold Plated Crimp Pins
15 Watt Dropping Resistor
(Recommended for 28 Volt Systems)
Operator's and Installation Manual
Quantity
1
70
1
1
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
A.
Speaker, 4
Ω
B. Headphones, 150
Ω
stereo, up to 6 as required
C. Microphones, up to 6 as required
D. Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed)
E. Interconnect Wiring
F. Headphone Jacks (As Required)
G. Microphone Jacks (As Required)
H. Circuit Breaker: 1 ea. 2 amp.
1.8 LICENSE REQUIREMENTS
None
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PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
2. Section II -Installation
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnect instructions for the PS Engineering PMA6000-Series Audio Selector Panel/Intercom System and PMA6000M-Series
Audio Selector Panel/Intercom System with internal Marker Beacon.
With the exception of the internal marker beacon receiver, the PMA6000, PMA6000S,
PMA6000C and PMA6000SC are identical to the PMA6000M, PMA6000M-S,
PMA6000M-C, PMA6000M-S-C. All units will be identified hereafter as the PMA6000, where the information applies to all.
Please read this manual carefully before beginning any installation to prevent damage and post installation problems. Installation of this equipment requires special tools and knowledge. The equipment must be installed by an appropriately rated Certified Aircraft Repair
Station, in accordance with applicable regulations.
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 Section 1.6 (B). If any claim is to be made, save the shipping material and contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accessories shows 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 PMA6000 is not required. However the unit should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate cooling air provided.
NOTICE: To reduce the amount of heat dissipated in the audio selector panel, when used in a 28 Volt aircraft, it is suggested that the 15
Ω
, 15 Watt dropping resistor (p/n 701-015-1501) be installed in series with the power input.
If the PMA6000/M-S is installed in a 27.5 VDC aircraft system, a 15
Ω
, 15 Watt dropping resistor (p/n 701-015-1501) should be installed. Failure to do so will generate unnecessary heat inside the unit and may void PS Engineering's warranty.
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
2.3.2 Mounting Requirements
The PMA6000 must be rigidly mounted to the instrument panel of the aircraft structure and within view and reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2A. The unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.
NOTE: The mounting hole configuration for the PMA6000 is identical to the
KMA-24 Audio Selector Panel.
2.3.3 Mounting Rack Installation
2.3.3.1 Monaural (6000, 6000M, 6000C, 6000MC)
Remove the unit from the mounting tray by first removing the copilot volume and squelch knobs (the knobs are press-fit on the shaft) and then unscrew the 3/32-inch hex-head screw that is to the right of the copilot control knob shaft. Carefully slide the unit free of the tray. Set the unit aside in a safe location until needed. Install the tray using six FHP 6-
32 x ½-inch screws. The audio selector panel must be supported at front and rear of the mounting tray.
2.3.3.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is to the right of the squelch knob shaft. It is not necessary to remove the squelch knob.
Carefully slide the unit free of the tray. Set the unit aside in a safe location until needed.
Install the tray using six FHP 6-32 x ½" screws. The audio selector panel must be supported at front and rear of the mounting tray.
2.3.4 Connector Assembly
The unit connectors mate directly with the circuit boards in the PMA6000. The connectors are a Molex crimp-type, and require the use of a Molex hand crimp tool, EDP P/N 11-01-
0203, CR6115B (or equiv.). The connector is mounted to the unit tray with #4-40 screws, from the inside of the tray. Ensure that proper strain relief and chafing precautions are made during wiring and installation.
2.4 Cable Harness Wiring
Referring to Appendix B, C, D and E, assemble a wiring harness as required for the installation. All wires must be MIL-SPEC in accordance with current regulations. Two- and three-conductor with shield wire must be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct techniques may result in improper operation, electrical noise or unit failure. Damage caused by improper installation will void the PS Engineering warranty.
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
2.4.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft, there is a potential for both radiated and conducted noise interference.
The PMA6000 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 bottom connector, pin 20, of the PMA6000 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 PMA6000s were designed in a RFI hardened chassis and have 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).
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.
2.4.2 Entertainment Input
2.4.2.1 Monaural (6000, 6000M, 6000C, 6000MC)
Two entertainment devices (CD player, cassette player, etc.) can be connected to the unit.
Install two 1/8-inch stereo jacks in a convenient location so that the pilot can plug in the entertainment devices into the system.
For a stereo input, we recommend tying the left and right channels (tip and ring) together, so both stereo channels are provided to the monaural audio panel, and the audio amplitude available to the audio panel is increased. Audio signal at the entertainment input must be a minimum of 500 mV P-P for optimum music performance.
NOTE: The Soft Mute must be enabled in the 6000, 6000M, 6000C,
6000MC either by connecting top connector pins N and 12 together in the harness, or through an external Soft Mute Enable switch.
2.4.2.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
Two stereo entertainment devices (CD player, cassette player, etc.) can be connected to the unit. Install two 1/8-inch stereo jacks in a convenient location so that the pilot can plug in the entertainment devices into the system. The audio signal at the entertainment input must be a minimum of 500 mV P-P per channel for optimum music performance.
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
2.4.2.3 Soft Mute
The PMA6000-system incorporates a "Soft Mute" system. This will mute the entertainment devices during ICS or radio activity. While in the ALL or ISO modes, entertainment
#1 is heard by everyone (except by the pilot in ISO mode). While in the CREW mode, pilot and copilot will hear entertainment #1 while the passengers will hear entertainment #2.
Entertainment inputs #1 and #2 can be paralleled so a single entertainment source can serve both the passengers and the crew in "crew" mode. It is suggested however, that a switch (DPDT) be installed between the single entertainment device and entertainment input #1. This will allow the pilot and copilot to decide if they hear entertainment while in the Crew mode.
Local oscillators and internal signals from some entertainment equipment can cause undesired interference with other aircraft systems. Before takeoff, operate the entertainment devices to determine if there is any adverse effect within the aircraft systems. If any unusual operation is noted in flight, immediately switch off the entertainment devices.
NOTE: Use the low level output of any entertainment device to connect to the audio panel. Maximum signal level is 1 VAC p-p. DO
NOT use a speaker-level output, this will cause internal damage in the audio panel
2.4.2.4 Soft Mute (Stereo only)
Entertainment #1 input has a "Soft Mute" inhibit switch that is part of the volume control located on the front panel. By pressing it once, the entertainment device will not be muted, push it again and it will be muted by intercom and radio conversation.
2.4.3 External 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 radio. If the pilot and copilot both use the PTT, the copilot position has access to the radio. The pilot position will have PTT control regardless of the copilot when the PMA6000 is in the F
AIL
-
SAFE
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 mic 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).
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PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
2.4.4 Transmit Interlock
Some communications transceivers use a transmit interlock system. In order to fully utilize the Split Mode feature, this function must be disabled. Consult that manufacturer's installation manual.
2.4.5 Power
The PMA6000-Series are compatible with both 13.8 and 28 Volt DC systems. A two (2)
Amp circuit breaker is required. Power and ground wires must be a twisted #18 AWG pair.
Included with this product is a power dropping resistor to be connected in series with the power input, bottom connector, pin 20. This dropping resistor is supplied for 28 volt systems so that unnecessary heat dissipation inside the PMA6000 can be avoided.
NOTICE: To reduce the amount of heat dissipated in the audio selector panel, when used in a 28 Volt aircraft, it is suggested that the 15
Ω
, 15 Watt dropping resistor (p/n 701-015-1501) be installed in series with the power input.
2.4.6 Existing KMA-24 Installation
If the installation replaces a KMA-24 (series -01, -02 or -03), the existing 44 pin connector can be used for the bottom connector of the PMA6000 tray as it is, if it is properly installed and wired. A dropping resistor must be in series with the power in a 28V KMA 24 installation. No other changes are required except for external marker lights (see Section
3.7.2 for details). The "key" in the existing connector must be located between pins 7 and
8. This connector will be used in the bottom connector position. (See Appendix B, C, D and E for complete wiring harness details.)
2.4.7 "Swap" Mode
When a normally-open, momentary, push-button switch is connected between pin 10 on the top 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 of removing your hands from the yoke to change transceivers.
NOTICE: Some older model radios may cause the Swap mode to activate on the release of the PTT switch, due to the excessive back EMF from the collapsing relay coil field. Verify that back EMF suppression, in the form of a diode across the
T/R relay coil, is present if un-commanded Swap occurs.
2.4.8 Backlighting
The PMA6000 has an automatic back-lighting system controlled by a photodetector. Additional control can be gained by the aircraft avionics dimmer control. Connect the dimmer control line to bottom connector pin D for 14 volt systems, and to bottom connector pin F for 28 volt systems. Pin E is light ground. This installation provides the ability to bring the
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PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual back-lighting level to zero. If dimmer control is not used, a constant low level back light illumination has been established for night-time viewing. The photocell located at the lower right hand side of the unit face will automatically adjust the backlight of the pushbutton lamps as well as the rotary mic selector switch light intensity.
2.4.9 PA Mute
Bottom connector pin 18 is a TTL logic output that is pulled low during PTT operation.
This serves as an input to external public address system to prevent feedback during transmissions.
2.4.10 Intercom
The top connector is for the intercom function. All mic and headphone jacks must have insulating washers, the cable must be Teflon coated, twisted-shielded wire, and the shield must only be connected to the ground return wire only at the intercom connector. NOTE:
This harness can be custom made by PS Engineering, Inc. Simply call the factory and obtain a wire harness work-sheet. The harness will be made to your specifications and fully functionally tested. All hardware is included. (See Appendix C (mono) and E (stereo) for intercom connection configurations).
2.5 Adjustments
The PMA6000 is factory adjusted to accommodate the typical requirements for most aircraft configurations. There are three adjustments however, that will allow the installer to tailor the specific functions.
Marker Beacon
Audio Level
Cabin Speaker
Level
Adjustment Clockwise Results In
Cabin Speaker Level Increase Speaker Volume
Marker Beacon Level Decrease Marker Volume
Music Trip Level (Mono) Decrease Sensitivity
Pass. Headphone (Mono) Decrease Volume
To make the necessary adjustments, use a small jeweler's slotted screwdriver.
Music Trip
Level (Mono)
Passenger
Volume (Mono)
Figure 2-1 Adjustments
2.6 Marker Antenna Installation
Refer to aircraft and antenna manufacturer's installation instructions, as well as AC43.13-
2A (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.
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2.7 Communications Antenna Installation Notes
For best results while in Split Mode, it is suggested that the one VHF communications antenna be located on top of the aircraft while the other communications antenna be on the bottom. Any antenna relocation must be accomplished in accordance with AC 43.13-
2A, 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 PMA6000 in Split Mode.
2.8 Unit Installation
2.8.1.1 Monaural (6000, 6000M, 6000C, 6000MC)
To install the monaural PMA6000, remove the copilot volume and squelch knob. 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 screw next to the copilot control shaft until the unit is secure. DO NOT OVER TIGHTEN. Reinstall the knobs removed in step 2.3.3.1.
2.8.1.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
To install the stereo PMA6000S, 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 screw next to the squelch control shaft until the unit is secure.
DO NOT OVER TIGHTEN.
Warning: Do not over-tighten the lock down screw while installing the unit in tray.
Internal damage will result.
2.9 Post Installation Checkout
After wiring is complete, verify power is ONLY on pin 20 of the bottom connector, and airframe ground on bottom connector pin Z. Failure to do so will cause serious internal damage and void PS Engineering's warranty.
2.9.1 Operational Checkout, 6000, 6000S, 6000M, 6000M-S
1. Apply power to the aircraft and avionics.
2. Plug headsets into the pilot, copilot and passenger positions.
3. Rotate the Mic Selector Switch to the Com 1 position.
4. Verify that the C1 light comes on. Verify that the power LED (Light Emitting Diode) in the intercom section illuminates green. If the LED is red, stop testing and troubleshoot the microphone PTT installation.
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5. Verify proper transmit and receive operation on the copilot position, noting that the copilot PTT switch allows proper transmission on the selected transceiver.
6. 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.
7. Repeat for Com 2 and TEL, (if installed).
8. Rotate the mic selector switch to the C
OM
1/2 position. Verify that the pilot communicates on Com 1 and the copilot on Com 2.
9. Rotate the mic selector switch to the C
OM
2/1 position. Verify that the pilot communicates on Com 2 and the copilot on Com 1.
10. Rotate the mic selector switch to the
TEL
/
COM
1 position. Verify that the pilot communicates on the transceiver in the T
EL
position and the copilot on Com 1.
11. Verify proper operation of all receiver sources by selecting them using the keypad.
Note that the button for the receiver sources stays in, and the button illuminates to show which source is in use.
12. Push in the S (SPR) button. Verify that all selected audio is heard in the cockpit speaker. Verify that the audio mutes when the mic is keyed.
13. Verify that the LED in the intercom changes from green to red when a microphone is keyed. NOTE: LED does not change color in "Split Mode".
14. Verify proper Intercom system operation in the A
LL
, I
SO
And C
REW
modes.
15. 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.
2.9.1.1 Marker Checkout, 6000M, 6000M-S Only
1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test in HI sensitivity, verify that a 150
µ
Volts, 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 (M) push-button has been depressed. Select "S" for speaker to verify marker audio availability on the cabin speaker. Verify that the white (A) and blue (O) lights will illuminate within
±
3dB of the amber lamp, with
3000 HZ and 400 Hz applied, respectively.
2. Repeat with the unit in LOW sensitivity, with 1400
µ
Volts applied.
3. Connect the marker antenna and verify proper operation.
2.9.2 Operational Checkout, 6000C, 6000M-C and 6000M-S-C
1. Apply power to the aircraft and avionics.
2. Plug headsets into the pilot, copilot and passenger positions.
3. Rotate the Mic Selector Switch to the C
OM
1 position.
4. Verify that the C1 light comes on. Verify that the power LED (Light Emitting Diode) in the intercom section illuminates green. If the LED is red, stop testing and troubleshoot the microphone PTT installation.
5. Verify proper transmit and receive operation on the copilot position, noting that the copilot PTT switch allows proper transmission on the selected transceiver.
6. 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.
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7. Repeat for Com 2 and Com 3, (if installed).
8. Rotate the mic selector switch to the C
OM
1/2 position. Verify that the pilot communicates on Com 1 and the copilot on Com 2.
9. Rotate the mic selector switch to the C
OM
2/1 position. Verify that the pilot communicates on Com 2 and the copilot on Com 1.
10. Rotate the mic selector switch to the C
OM
3 position. Verify that the pilot communicates on the transceiver in the Com3 position and the copilot on Com 1.
11. Verify proper operation of all receiver sources by selecting them using the keypad.
Note that the button for the receiver sources stays in, and the button illuminates to show which source is in use.
12. Push in the S (SPR) button. Verify that all selected audio is heard in the cockpit speaker. Verify that the audio mutes when the mic is keyed.
13. Verify that the LED in the intercom changes from green to red when a microphone is keyed. NOTE: LED does not change color in "Split Mode".
14. Verify proper Intercom System operation in the A
LL
, I
SO
and C
REW
modes.
15. Verify that the unit under test 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.
2.9.2.1 Marker Checkout, 6000M-C, 6000M-S-C Only
1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test in HI sensitivity, verify that a 150
µ
Volt signal, modulated 95% at 1300 Hz, will illuminate the amber (M) marker light, and that marker audio is present in the headphones when the Marker Audio (M) push-button has been depressed. Select "S" for speaker to verify marker audio availability on the cabin speaker. Verify that the white
(A) and blue (O) lights will illuminate within
±
3dB of the amber lamp, with 3000 HZ and 400 Hz applied, respectively.
2. Repeat with the unit in LOW sensitivity, with 1400
µ
Volts applied.
3. Connect the marker antenna and verify proper operation.
2.10 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 log book entry, FAA Form 337, weight and balance computation and other documentation as required. Return completed warranty registration application to PS Engineering.
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Installation Manual
3. Section III OPERATION
GENERAL INFORMATION
3.1 SCOPE
This section provides detailed operating instructions for the PS Engineering PMA6000,
PMA6000S, PMA6000M, PMA6000M-S, PMA6000C, PMA6000S-C, PMA6000M-C, and PMA6000M-S-C Audio Selector Panel/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 four sections covering the basic operating areas of the
PMA6000 systems. They are: Audio Selector, Transceiver Selection, Intercom, and
Marker Beacon Receiver (6000M, 6000M-C 6000M-S and 6000M-S-C only).
3.2 Audio Selector (All models)
Through the use of two momentary and seven latched, push-button, back-lit switches, it is possible to select any or all receiver audio. C1 and C2 are momentary switches.
Figure 3-1 Audio Selector
heard by the pilot and copilot (the crew), "Cl"
(Com 1) and "C2" (Com 2) push-buttons are of the momentary type and do not remain in when selected. This is also part of the "auto function." You will always hear the audio from the transceiver that is selected by the rotary mic selector switch.
When selected, an internal backlight will illuminate indicating which audio source is selected. Because the rotary switch controls what transceiver is being
The users can identify which receivers are selected by noting which push-button switches are illuminated. Push buttons labeled Nl (Nav 1), N2 (Nav 2), D (DME), M (Marker), A
(ADF), AX (auxiliary), and S (Speaker) are "latched" type switches. When one of these buttons is pressed, it will stay in the "in" position. Press the switch again and it be in the
"out" position and remove that receiver from the audio. While selected, the switch will also be annunciated by an internal lamp.
3.2.1 Speaker Amplifier
The "S" in the push-button section stands for speaker. This switch will place all selected audio on the cockpit speaker when this switch is selected. NOTE: The speaker amplifier is not active in the "Split Mode." It is recommended that the speaker be switched off when not in use.
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3.3 Mic Selector Switch (Fail Safe Operation)
Unit power is turned on and off by the Mic selector switch. In the
OFF
or "
FAIL
-
SAFE
" position, the pilot is connected directly to Com
1 allowing transmit and receive capability regardless of unit condition. Any time power is removed or turned
OFF
, the audio selector will be placed in the fail-safe mode. The first position clockwise from O
FF
is C
OM
1. Both pilot and copilot will be connected to the
Com l transceiver. While in the C
OM
1 or C
OM
2 mode, the inter-
Figure 3-2 Mic
Selector
com functions normally. Both the pilot and copilot have transmit capabilities on the selected transceiver. All hear the selected audio if the intercom is in the A
LL
mode. Only the person who presses their
Push To Talk (PTT), will be heard over the aircraft radio. Turning the rotary switch to the
C
OM
2 position will place pilot and copilot on Com 2.
The PMA6000-Series has an automatic selector mode. Audio from the selected transceiver is automatically heard in the headsets and speaker. You can check this function by switching from C
OM
1 to C
OM
2 and watch the selected audio light on the selector change from C1 to C2. This ensures the pilot will always hear the audio from the transceiver he is transmitting on.
In PMA6000-series units, Serial Number T03092 and above, when switching the mic selector rotary switch from C
OM
1 to C
OM
2, while C
OM
2 audio had been selected, Com 1 audio will continue to be heard. This eliminates the pilot having to switch Com 1 audio back on, if desired.
When switching from C
OM
1 to C
OM
2 while Com 2 has NOT been selected, Com 1 audio will be switched off. In essence, switching the mic selector will not effect the selection of
Com audio.
Important: When the mic selector is in the full counter clockwise position, the
PMA6000 power is removed, and it is in the
FAIL
-
SAFE
mode. The pilot headset and microphone is connected directly to Com 1.
3.3.1 Mic Selector Switch, Com 3 (6000C, 6000MC 6000SC and 6000MSC only)
In units designed to accommodate a third communications transceiver, placing the mic selector switch in the C
OM
3 position connects the pilot and copilot to that radio. This is similar to C
OM
1 and C
OM
2, except that the swap mode is not active.
3.3.2 Swap Mode (Switch from Com 1 to Com 2 remotely)
With a yoke mounted, momentary switch, the pilot can change from the current Com transceiver to the other by depressing this switch. When "Swap Mode" is active, an amber annunciator will illuminate, indicating that the Mic Selector switch position is no longer valid. To cancel "Swap Mode," the pilot may either press the yoke mounted switch again, or turn the Mic Selector Switch to the Com that is active.
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3.4 Split Mode (6000, 6000M, 6000S, 6000MS)
Turning the rotary switch to C
OM
1/C
OM
2 places the PMA6000 into "Split Mode". This places the pilot on Com 1 and the copilot on Com 2. Pilot and copilot are isolated from each other on the intercom, but can use their respective radios simultaneously. An example of this useful feature is when the pilot may want to talk to Air Traffic Control, while the copilot may be speaking to Flight Watch.
The "Split Mode" radio selection can be reversed by switching to C
OM
2/C
OM
l. The pilot will be on Com 2 and the copilot will be on Com 1. A third "Split Mode" selection is
T
EL
/C
OM
l. This will place the pilot on airborne radiotelephone, HF or other transceiver (if installed), while the copilot will be on Com 1.
3.5 Split Mode (6000C, 6000MC, 6000SC, 6000MSC)
Operation is identical to section 3.4 (above) except turning the mic selector clockwise to the C
OM
3 position places both pilot and copilot on Com 3, and exits the split mode. All selected audio inputs and intercom function return.
Note: Split Mode turns off all other (Nav, ADF, etc.)selected audio to pilot and copilot. Additionally, there is no intercom function between pilot and copilot. Passengers still have intercom capability among themselves.
3.6 Intercom
3.6.1 Volume Control, Monaural (6000, 6000M, 6000C, 6000MC)
Figure 3-3 Volume Controls Mono
The pilot volume control knob adjusts the loudness of intercom and music in the pilot’s headphones only. It has no effect on selected radio audio levels. The copilot volume control adjusts the loudness of the intercom and music in the copilot headset only. The passenger volume is factory set at a comfortable level. Most general aviation headsets have a built-in volume control, so volume can be adjusted “locally.” The overall passenger volume can be adjusted by a pot accessed through the top of the unit. (see Figure 2-1)
3.6.2 Volume Control, Stereo, (6000S, 6000MS, 6000SC, 6000MSC)
Figure 3-4 Volume Control Stereo
The volume control knob adjusts the loudness of the intercom and music for the pilot and copilot only. It has no effect on selected radio levels or passengers' level.
The passenger volume level is factory set for a comfortable listening level. Most general aviation headsets today have a built-in volume controls, therefore, volume can be adjusted at the headset. If it is desired to change
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Installation Manual the overall passenger volume, your avionics shop can install a volume control (installer to supply) in series with the passengers headset. This will allow external adjustment to the passenger's headset for a comfortable listening level.
3.6.2.1 Mono headsets in Stereo Installation
All passenger headsets are connected in parallel. Therefore, if a monaural headset is plugged in to a PMA6000 Stereo installation, one channel will be shorted. Although no damage to the unit will occur, all passengers will lose one channel. PS Engineering modifies headsets to add stereo capability, using high-fidelity speakers. Contact factory for details.
3.6.3 Adjusting the VOX-Squelch control, Monaural (6000, 6000M, 6000MC)
The PMA 6000 provides adjustable VOX squelch controls for the pilot and copilot (the copilot's VOX control also adjusts the passengers VOX squelch) Since the number of microphones open at any one time is reduced, the amount of background noise is diminished.
This also allows the use of dissimilar headsets with the same intercom. The user can adjust the trip level of the VOX to fit the individual's voice and mic, which helps eliminate the frustration of clipping the first syllables.
With the engine running, set the VOX control knob by slowly rotating the S
QL
control knob clockwise until you no longer hear the engine noise in the headphones. When the microphone is positioned properly near your lips, normal speech levels should open the channel. When you have stopped talking, there is a delay of about ½ second before the channel closes. This helps prevent choppy communications.
3.6.4 Adjusting the VOX- Squelch control, Stereo (6000S, 6000MS, 6000SC
6000MSC)
The stereo versions of the PMA6000 incorporate a single VOX Squelch control for all positions. Like all PS Engineering intercoms, since the number of microphones active at any one time is reduced, the unwanted background noise in the headphones is diminished.
This also allows the use of dissimilar headsets with the same intercom.
With the engine running, set the VOX trip level by slowly rotating the S
QUELCH
control knob clockwise until you no longer hear the engine noise in the headphones. When the microphone is positioned properly near your lips, normal speech levels should open the channel. When you have stopped talking, there is a delay of about ½ second before the channel closes. This prevents closure between words and prevents choppy communications.
3.6.5 Intercom Modes (All versions)
The center switch is a three position mode switch that allows the pilot to tailor the intercom function to best meet the situation. The description of the intercom mode function is valid only when the unit is either in the C
OM
1 or C
OM
2 position of the Mic Selector switch. When the unit is in the "Split" mode, only the passengers have intercom function.
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I
SO
: (Up Position): The pilot is isolated from the intercom and is connected only to the aircraft radio. He will hear the aircraft radio reception (and sidetone during radio transmissions). Copilot and passengers will hear the intercom and music on Entertainment 1, but not the aircraft radio receptions or pilot transmissions.
A
LL
: (Middle Position): All parties will hear the aircraft radio, intercom, and music from entertainment input #1. However, during any intercom communications, the music volume automatically decreases. The music volume increases gradually back to the original level after communications have been completed.
C
REW
(Down Position): Pilot and copilot are connected on one intercom channel and have exclusive access to the aircraft radios. They may also listen to Entertainment 1. Passengers can continue to communicate with themselves without interrupting the Crew and also may listen to Entertainment 2. Anytime the PMA6000 is in either the C
OM
1/C
OM
2,
C
OM
2/C
OM
1, or T
EL
/C
OM
1, ("Split Mode") the pilot and copilot do not have any intercom function. The passengers will maintain intercommunications.
3.6.5.1 Soft Mute (Mono)
Soft Mute must be enabled during installation by jumpering top connector pins 12 and N.
A SPST switch can be installed between these pins for a pilot selectable mute mode.
Without this connection, music is not muted during intercom activation. This “Karaoke
Mode” prevents the music muting when a sing-along is desired. "Soft Mute" mode only applies to entertainment input #1. Entertainment #2 does not mute.
3.6.5.2 Soft Mute (Stereo)
"Soft Mute" mode can be selected. by pressing in the Volume control knob once. Both entertainment devices have the "Soft Mute" mode, however, only entertainment input #1 has the mute inhibit capability.
3.6.5.3 Entertainment Input
The audio selector panel has provisions for up to two separate entertainment input devices. Which device is heard is determined by the position of the three position mode switch located in the center of the intercom section of the audio panel. (See Table 3-1 for overview.)
While in the ISO (Isolate) mode, only the copilot and the four passengers will hear entertainment device #1. In normal operation, whenever a person speaks or if the aircraft radio becomes active, the music will automatically mute and then will gradually return to the original listening level when the intercom or radio activity ceases.
Which entertainment device will be heard is determined by the mode selector switch.
When in the A
LL
mode, all parties will hear the entertainment input #1. While in the C
REW mode, pilot and copilot will hear entertainment input #1 while the passengers may listen to entertainment input #2.
It is also possible to use only one entertainment input device for both entertainment inputs.
It is suggested however, that a switch (DPDT) be installed between the single entertain-
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Installation Manual ment device and entertainment input #1. This will allow the pilot and copilot decide if they hear entertainment while in the Crew mode.
Table 3-1 Intercom Modes
Mode
Isolate
All
Crew
Pilot Hears
A/C Radio
Pilot Sidetone
(during radio transmission)
Pilot
Copilot
A/C Radio
Passengers
Entertainment #1
Pilot
Copilot
A/C Radio
Entertainment #1
Copilot Hears
Copilot and passenger intercom
Entertainment #1
Copilot
Pilot
A/C Radio
Passengers
Entertainment #1
Copilot
Pilot
A/C Radio
Entertainment #1
Passenger Hears
Passenger and Copilot intercom
Entertainment #1
Passengers
Pilot
Copilot
A/C Radio
Entertainment #1
Passengers
Entertainment #2
Comments
This mode allows the pilot to communicate with the ground without the copilot or passengers bothered by the conversations.
Copilot and passengers can continue to communicate and listen to music
This mode allows all on board to hear radio reception as well as communicate on the intercom.
Music and intercom is muted during intercom and radio communications
A second music source is automatically enabled for the passengers.
3.7 Marker Beacon (PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-
S-C)
The optional Marker Beacon Receiver uses visual and audio indicators to alert you when the aircraft passes over a 75 MHz transmitter.
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 "A," is the Airway/Inner marker and has a 3000 Hertz 'dot' tone.
The lamp and tone will be keyed at a rate of six times per second.
The audio from the Marker Beacon Receiver can be heard by selecting the "M" pushbutton switch. To adjust the volume level, there is a service adjustment located on the top of the unit. See Section 2.5
A three position switch is used to set the receiver sensitivity and to test the indicator lamps. Use "H
IGH
" sensitivity initially. This allows you to hear the outer marker beacon about a mile out. Then select the “L
OW
” sensitivity to give you a more accurate location of the Outer Marker. The momentary down switch position is labeled "T
EST
" and illuminates all three lamps simultaneously to assure the lamps are in working order.
Upon first application of power to the unit, the Marker enters a self test mode. The flickering blue marker light indicates a test in process. If the test continues for more than 10 seconds, or the lamps do not extinguish, return the unit for service.
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3.7.1 Middle Marker Sense
A Middle Marker sense output signal is available to automatically reduce the autopilot sensitivity after the aircraft has passed over the Middle Marker. This function will not operate during the test mode. This output will go to +4.75 VDC (
±
0.25 VDC) when a valid
Middle Marker signal is received.
3.7.2 External Marker Lights (6000, 6000S, 6000C, 6000SC)
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 (+9 VDC
±
0.5
VDC) when active. Maximum source current per lamp is 125 mA.
If using an external marker receiver, the audio input is lower connector, pin 11 (Aux. input).
3.7.3 Receiver Sensitivity
Although the PMA6000M meets FAA TSO-C35d sensitivity specifications, the sensitivity of the receiver has been adjusted to meet real world requirements (150
µ
V and 1400
µ
V
Soft). This will usually eliminate the need for the avionics shop to reduce the sensitivity in the field so as to prevent early detection of the marker beacons. If your particular installation requires more or less sensitivity, please call the factory for details on how to adjust the receiver sensitivity in the field.
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4. 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- certified avionics shop and authorized PS Engineering dealer.
An FAA Form 337 must also be accompanied by the warranty card for this warranty to be in effect. If the unit is being installed by in an experimental aircraft, a factory-made harness must be installed 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 one year from the date of installation. During this one 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.
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 CON-
SEQUENTIAL DAMAGES. This warranty does not cover a defect that has resulted from improper 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.
4.2 Factory Service
The unit is covered by a one-year limited warranty. See warranty information. Call PS Engineering, Inc. at (423) 988-9800 before you return the 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.
9800 Martel Rd
Lenoir City, TN 37772
(423) 988-9800 FAX (423) 988-6619
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5. Appendix A
External PTT Hook Up
Part of the installation includes the installation of PTT (Push To Talk) switches that allow the use of your aircraft radio for communications transmissions.
There are three configurations that can be used, you must select the case that best fits your installation.
NOTE: Only the person who presses their PTT switch will be heard over the radio.
CASE I
The PTT is built into the pilot and copilot yokes
Simply install the plugs from the headset into the aircraft headphone jacks. Then use the yoke mounted
PTT to transmit. No other action is required.
CASE II
Built in PTT only on the pilot side only
This configuration requires a modified external PTT switch plugged into the copilot's mic jack. (See Details Below) When the copilot's PTT is depressed, this activates an internal relay that switches the mic audio to the aircraft radio from the pilot to the copilot.
Case III
No built in PTT switch at all.
Two built-in PTT must be installed, or two external, modified PTT switches will be required for both the pilot and copilot. Modifications to the PTT are required. (See details below)
Push To Talk Modifications
When received from the manufacturer, an after-market PTT switch opens the mic audio path to the "ring" connection of the PTT mic plug until the button is pressed. When the PTT is between the intercom and the headset, the intercom function will not work unless the PTT switch is depressed. A simple modification can be performed to allow proper intercom operation. NOTE: This mod does not alter normal operation.
Below are some examples of typical modifications. Contact PS Engineering or the PTT manufacturer for more details if necessary.
Procedures For David Clark PTT
1. Unscrew the round black plastic cover from the jack.
2. Connect the joined black wires to the red wire.
3. Replace the round black plastic cover.
Procedures for Telex PT-200
1. Unscrew the round black plastic cover from the jack.
2. Cut the red wire in the middle of the wire.
3. Strip both ends of the insulation.
4. Solder the two ends to the ground lug to the PTT jack.
5. Replace the round black plastic cover.
Procedures for Telex PT-300
1. Unscrew the round black plastic cover from the plug jack.
2. Remove the heat shrink material from the joined black wires.
3. Solder these two wires to the lug that has a white wire already soldered to it.
4. Replace the round black plastic cover
200-066-0001 Appendix A Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Appendix B Bottom Connector wiring, PMA 6000, PMA 6000M, PMA6000C PMA6000MC
200-066-0001 Appendix B Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Appendix C Bottom Connector wiring, PMA 6000S, PMA 6000MS, PMA6000SC PMA6000MSC
200-066-0001 Appendix C Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Appendix D Top Connector wiring, PMA 6000, PMA 6000M, PMA6000C PMA6000MC
200-066-0001 Appendix D Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Appendix E Top Connector wiring, PMA 6000S, PMA 6000MS, PMA6000SC PMA6000MSC,
200-066-0001 Appendix E Rev. 1, April 1998
PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
Appendix F -Instructions for Continuing Airworthiness
The PM6000 is considered an “on-condition” maintenance item. It should be checked prior to each flight during normal operation. There are no additional considerations for continuing airworthiness other than the practices detailed in AC 43.13-1A, Chapter 15,
Paragraph 750. This includes inspecting the unit to be sure it is securely fastened in its location, and that the wiring harness is not chafed or pinched, and remains secure. All panel jacks should be checked at each periodic inspection to ensure that they are tight and not in contact with other items behind the instrument panel.
Appendix G –Example for FAA Form 337
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 PM6000 audio panel you may use the following text as a guide.
Installed 6-place intercom/audio selector panel, PS Engineering PMA6000MS, part number 6000MS in center stack instrument panel location designated for panel mounted avionics at station . Installed per AC43.13-2, Chapter 2, paragraph 23 (Instrument Panel Mounting). Installed per PS Engineering Installa-
tion Operators Manual p/n 200-066-0001, revision 1, dated April, 1998.
This unit is FAA-Approved under TSO C50c for audio amplifiers, and TSO C35d for Maker Beacon Receivers, and meets environmental tests outlined in RTCA
DO-170B 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 the aircraft dimmer bus is accomplished per the installation manual and . Power is supplied to the unit through a 1A circuit breaker (type and part number), and total electrical load does not exceed % of the electrical system capacity with the PMA1000 added.
Aircraft equipment list, weight and balance amended. Compass compensation checked. A copy of the operation instructions, contained in PS Engineering document 200-066-0001, revision 1, March 1998, is placed in the aircraft records. All work accomplished listed on Work Order .
200-066-0001 Appendix F Rev. 1, April 1998

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Key features
- 6-station intercom
- 3 transceiver switching
- 6 receiver switching
- cabin speaker
- 2 entertainment inputs
- fail-safe mode