PMA4000 Audio Panel
Panel mounted audio selector panel w/the added capability of a 4-station intercom. Provisions for switching two communications transceivers & navigation receivers, as well as providing a speaker amplifier are all part of this integrated, compact unit.
IntelliVoxT
PS Engineering’s exclusive IntelliVoxT with individual volume controls.
Approval Basis The PMA4000 Audio Selector Panels (P/N 11942) are FAA approved under TSO C50c (Audio Amplifiers).
Audio Selector
Intercom Mode Selector Switch
Microphone (Transmit) Selector Switch
Microphone Selector
The up switch position is C8; 1. Both pilot and copilot will be connected to the Com l transceiver. While in the C8; 1 or C8; 2 mode, the intercom 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== mode. Only the person who presses their Push To Talk (PTT), will be heard over the aircraft radio. Placing the toggle switch in the C8; 2 position will place pilot and copilot on Com 2. The PMA4000-Series has an automatic selector mode. Audio from the selected transceiver is automatically heard in the headsets and speaker (when selected). You can check this function by switching from C8; 1 to C8; 2 and watch the selected audio light on the selector change from C1 to C2. This ensures the pilot will never transmit on a radio is not listening to. When switching from C8; 1 to C8; 2 while Com 2 has NOT been select switching the mic selector will not effect the selection of Com receiver audio.
Volume Control
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. The passenger volume is also adjusted by the copilot volume control. Most general aviation headsets have a built-in volume control, so volume can be adjusted “locally.” The copilot volume control is also controllable through the rear connector, so a tandem aircraft can adjust the volume from a different location.
Aircraft Intercom Modes Table
The audio selector panel has provisions for an entertainment input device. While in the ISO (Isolate) mode, only the copilot and the two passengers will hear the entertainment device. 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 radio or intercom activity ceases. Push to talk Intercom Mode
In some extremely high noise environments, it may be desirable to have a push-to-talk (PTT) intercom, instead of relying on voice activation (VOX). In the PMA4000 audio panel, the PTT intercom capability is added. To operate the PTT, Activate the panel-mounted VOX override switch. Then, the ICS PTT switch.
Emergency Procedures
In the event that the unit exhibits any anomalous behavior, such as an audio failure, transmitter failure, or other difficulty, the unit can be switched off in the following manner:
1. Placing the Intercom Mode Selector Switch (see Figure 1-2) into the “OFF” position.
2. Pulling the Audio Panel Circuit Breaker. This activates the fail-safe mode, which connects the pilot’s headset directly to Com 1. This allows communications or the pilot only, on Com 1 only
or maintenance as determined by us. This warranty is void if there is any attempt to disassemble this product without factory authorization. This warranty gives you specific legal rights, and you may also have other rights that may vary from state to state.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusions may not apply to you. Factory Service The PMA4000 is covered by a one-year limited warranty. See warranty information. Call PS Engineering, Inc. at (865) 988-9800 before you return the unit. This will allow the service technician to provide any other solutions beforehand.
