PS Engineering PMA6000M-S - Manual (Page 19)

PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0006 Page 3-2 Rev. 6, March 2005
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 posi-
tion 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 intercom func-
tions normally. Both the pilot and copilot have transmit capabilities on the se-
lected 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 (when selected). 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 never transmit on a radio is is not listening to.
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 re-
moved, 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 LED annunciator will illuminate, indicat-
ing 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.
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.
Figure 3-2
Mic Selector