UPS Aviation Technologies
SL10 Series Audio Selector Panel and Intercom System
User’s Guide
Page 5
1.5.4 Adjusting the VOX- Squelch control, Stereo (SL10S,
SL10MS)
The stereo versions of the SL10 incorporate a single VOX Squelch
control for all positions. Like all UPS Aviation Technologies intercoms,
since the number of microphones active at any one time is reduced, the
unwanted 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.
1.5.5 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 access to the aircraft radios. They may also
listen to Entertainment 1. Passengers can continue to communicate with
themselves without interrupting the Crew and also may listen to
Entertainment 2. Anytime the SL10 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.