Sigtronics RMS-640 Operating Instructions - Manual (Page 2)

SAS is set to the “ISO” mode, only the pilot can transmit
and receive on the aircraft radio(s). The pilot will not hear
intercom and cannot talk to the other headsets. The co-
pilot and passengers still have intercom, but do not hear
the radios.
Solo Flights
Since the intercom is not needed during solo flights, it may
be turned “OFF”. The pilot will still hear the aircraft radio(s),
since this circuit is always active, and may transmit to ATC
via his headset and push-to-talk switch. The pilot can also
listen to music (interrupted only by aircraft radio traffic) by
turning “ON” the PILOT MUSIC ON/OFF switch.
Fail-Safe
If power to the SAS unit fails, the pilot can still transmit and
receive on the a/c radio(s) (assuming the radio(s) are still
functioning). Additionally, if a problem is ever suspected in
the intercom, simply turn it to “OFF”. In this mode you will
also be able to transmit and receive on the aircraft radio(s)
from the pilot’s position. The hand mic may also be used,
however, the SAS unit should be turned to “OFF” and you
should unplug your headset mic plug from the mic jack.
(Leave headphone plug in for radio reception).
MUSIC SWITCHER OPERATION
Switcher Panel Controls:
PILOT MUSIC ON/OFF Switch - Turns Pilots music switcher
on or off.
PASSenger MUSIC ON/OFF Switch - Turns Co-pilot and
Passengers music switcher on or off.
To operate, turn “ON” the appropriate MUSIC ON/OFF
switch(s). Connect your music source to the music input
jack, if applicable. Turn your stereo music source on and
adjust to suitable listening level.
The Pilot is automatically switched from the music source
to the aircraft VHF radio when a radio message is received
or transmitted and is switched back when the radio traffic
is completed. His music is also automatically switched out
while someone is talking on the intercom (in “ALL” mode
only).
The Co-pilot and passengers music is interrupted by the
intercom. If the SAS is in the “ALL” mode the Co-pilot and
Passenger music is also interrupted by the aircraft radio(s).
In order to eliminate VHF interrupt, it is necessary to turn
the VHF radio volume down or off.
Stereo Headsets
Sigtronics stereo headsets are specifically designed for the
aircraft high noise environment and give excellent noise
attenuation. They also provide full frequency response
stereo for maximum enjoyment. They are compatible with
aircraft mic circuits and can be used as general aviation
headsets in aircraft that are not equipped with stereo
headphone jacks. This is because they include a switch
to change from “Stereo” to “Monaural.” No adapters
required.
NOTE: General aviation headset (monaural) phone plugs
should not be plugged into Stereocom stereo phone jacks.
A monaural plug in a stereo jack shorts out one of the audio
channels and therefore renders the aircraft VHF radio and
intercom reception inoperative. (You may still hear music,
however). General aviation headsets may be used only if
one of the following three changes are made:
1. Monaural to stereo adapters are used on the headset
headphone plugs. (Only monaural music will be
heard.)
2. The general aviation headsets are re-wired for stereo
reception.
3. Install the Sigtronics Stereocom system for
monaural operation. See Note 9 under the “WIRING
INSTRUCTIONS” section of the ST-400 / ST-600
STEREOCOM INSTALLATION INSTRUCTIONS.
1-12-2007 ST440OPR.PDF
Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
Phone: (909) 305-9399
E-mail: [email protected]
Web Site: www.sigtronics.com