PS Engineering PMA6000M-S - Manual (Page 21)

PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0006 Page 3-4 Rev. 6, March 2005
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.
3.6.4 Adjusting the VOX- Squelch control, Stereo (6000S, 6000MS, 6000SC 6000MSC)
The stereo versions of the PMA6000 incorporate a single VOX Squelch control for all positions. Like all
PS Engineering intercoms, since the number of microphones active at any one time is reduced, the un-
wanted background noise in the headphones is diminished. This also allows the use of dissimilar headsets
with the same intercom.
With the engine running, set the VOX trip level by slowly rotating the S QUELCH 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 prevents closure between words and prevents
choppy communications.
3.6.5 Intercom Modes (All versions)
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.
3.6.5.1 Soft Mute (Mono)
Soft Mute must be enabled during installation by jumpering 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.
3.6.5.2 Soft Mute (Stereo)
Both entertainment devices have the "Soft Mute" mode. In units earlier than a “G” intercom board serial
number (second set of numbers), only entertainment input #1 has the mute inhibit capability. "Soft Mute"
mode for the Crew positions (Entertainment 1) can be selected by pressing in the Volume control knob
once. In later units the SQL knob controls the Soft Mute of the passengers entertainment (#2).