6
PMA6000-Mono Pilot Guide
The
PMA6000 provides adjustable VOX squelch controls for the pi-
lot 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 system. 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.
Intercom Modes
The center switch is a 3-position mode selector that allows the pilot to tai-
lor 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
Mode Pilot Hears Copilot
Hears
Passenger
Comments
ISO
A/C Radio
Pilot Sidetone
(during radio
transmission)
Copilot
Passengers
Music 1
Copilot
Passengers
Music 1
This mode allows the pilot to
communicate with the air
traffic control without the copi-
lot or passengers bothered by
the conversations. Copilot
and passengers can continue
to talk and listen to music
All
Radios
Sidetone
Pilot
Copilot
Passengers
Music 1
Radios
Sidetone
Pilot
Copilot
Passengers
Music 1
Radios
Sidetone
Pilot
Copilot
Passengers
Music 1
This mode allows all on board
to hear radio reception as well
as communicate on the inter-
com. Music and intercom is
muted during intercom and
radio communications
Crew
Radios
Sidetone
Pilot
Copilot
Radios
Sidetone
Copilot
Pilot
Passengers
Music 2
A second music source is
automatically enabled for the
passengers
Intercom Mode Table
5
PMA6000 –Mono Pilot Guide
trol, 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 in-
stalled), while the copilot will be on Com 1.
Split Mode (6000C, 6000MC)
Operation is identical to p6000, 6000M (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: In all PMA6000s, 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. Pas-
sengers still have intercom capability among themselves.
Intercom
Volume Control, Monaural (6000, 6000M, 6000C,
6000MC)
Figure 3 Volume Controls
The pilot volume control knob
adjusts the loudness of intercom
and music in the pilot’s head-
phones 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. This is a serv-
ice adjustment that can be accessed by the avionics technician. Many
general aviation headsets have a built-in volume control, so volume
can be adjusted “locally.”
Adjusting the VOX-Squelch control
