PS Engineering PMA6000M-C Installation Manual - Manual (Page 18)

PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0100 Page 3-3 Rev. 1, March 2005
3.6 Intercom
3.6.1 Volume Control (6000, 6000M, 6000C, 6000MC)
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.
This is a service adjustment that can be accessed by the avionics
technician. Most general aviation headsets have a built-in
volume control, so volume can be adjusted “locally.”
3.6.2 Adjusting the VOX-Squelch control, (6000, 6000M, 6000MC)
The PMA6000 provides adjustable VOX squelch controls for the pilot and copilot (the copilot's VOX con-
trol 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.
3.6.3 Intercom Modes
The center switch is a 3-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.
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 when
SoftMute is active (See section 3.6.5.1). 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 ac-
cess to the aircraft radios. They may also listen to Entertainment 1. Passengers can continue to communi-
cate 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.
3.6.3.1 Soft Mute
Soft Mute must be enabled during installation by connecting 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.
Figure 3-3 Volume Controls