PS Engineering PMA8000D Installation Manual - Manual (Page 26)

PS Engineering
PMA8000D Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 3-2 Rev. 6, Oct. 2014
The PMA8000D “remembers” the receiver selection, so that when switching transmitters from COM 1 to
COM 2, if COM 2 or COM 3 audio was previously selected, COM 1 audio will continue to be heard. This
eliminates the pilot having to switch COM 1 audio back on, after changing transmitters.
When switching from COM 1 to COM 2 or COM 3 while that COM was not previously selected, COM 1
audio will be switched off. In essence, switching the mic selector will not override prior selection of COM
receiver audio.
In normal (not split) modes, the PMA8000D gives priority to the pilot’s radio Push-To-Talk (PTT). If the
copilot it transmitting, and the pilot presses his PTT, the pilot’s microphone will be heard over the selected
com transmitter.
3.2.1.1 Dual Transmission
N O T E
Due to the nature of VHF communications signals, and the size constraints in general aviation aircraft, it is
probable that there will be some bleed-over when both flight crew membes transmit at the same time on
different radios, particularly on adjacent frequencies. PS Engineering makes no warranty about the
suitability of dual transmit in all aircraft conditions.
3.2.1.2 Swap Mode (Switch from COM 1 to COM 2 or COM 3 remotely)
With a yoke mounted, normally open momentary switch, the pilot can change from the current COM trans-
ceiver to the other by depressing this switch. To cancel "Swap Mode," the pilot may either press the yoke
mounted switch again, or select a different COM with the XMT buttons. The PMA8000D can be configured
by the user to either Swap COM 1/COM 2, or COM 1/COM 2/COM 3. To change this function, press and
hold the swap switch, and push and release the COM 3 RCV button momentarily.
3.2.1.3 Monitor Mode
The PMA8000D is equipped with a Monitor function, which allows a secondary com radio audio to be
muted by the primary radio (selected for transmit). See §3.11.2 for more information. This feature is reset
on power cycles.
3.2.1.4 Stuck Microphone Protection (For units with serial number BD1023 and above)
The PMA8000D will sense if the pilot or copilot radio PTT remains keyed for more than 32 seconds. When
a stuck mic is detected, the key input is ignored, and the other crewmember can transmit normally. If the
stuck becomes ungrounded, normal operation is restored.
3.3 Audio Selector (4)
Communication audio from the other radio, not selected for transmit, can be heard by pressing the associat-
ed RCV button. You will always hear the audio from the selected transceiver.
Navigation receiver audio is selected through five momentary, push-button, backlit switches.
The users can identify which receivers are selected by noting which green switch LEDs are lit. Navigation
aid audio push buttons are labeled NAV 1, NAV 2, ADF and AUX (auxiliary). DME audio (if present) will
come through when the AUX button is selected. When one of these buttons is pressed, the mode is active,
and the LED will illuminate. Press the switch again and it will be "off" and remove that receiver from the
audio output.
Marker Audio (MKR) can be selected by pressing the MKR button for more than one second. (9)
3.4 Bluetooth Telephone
In a dual PMA8000D Installation, the pilot’s Bluetooth transceiver services music and telephone for the
pilot only. It is not possible to share the phone connected to the pilot’s audio panel. If the pilot’s cell phone
does not provide sidetone on the Bluetooth connection, the pilot will not hear himself on the telephone,
even if sidetone enabled per §3.4.1.