INTRODUCTION
This instruction sheet describes the operation of the Sigtronics
Sport 200 S intercom system. For information on Sport 200 S
installation see the separate Sport 200 S Installation Instruc-
tions.
The Sport 200 S series of aircraft intercoms incorporate voice
activated (VOX) intercom with “transmit through the aircraft
radio capability” using your push-to-transmit (PTT) switches,
and music input for two headset positions in a small single
chassis unit. In addition a Push-to-Intercom mode is available
for applications where voice activated (VOX) intercom operation
is not desired.
CONTROLS
Three controls are provided on the Sport 200 S units:
ON/OFF Switch - Turns the intercom “on” or “off”.
INTERCOM VOL - Volume Control - Controls the intercom volume.
(Except in OFF mode when the intercom is switched off)
INTERCOM SQ - Squelch Control - Sets the intercom turn-on
threshold for voice activated intercom (VOX) mode.
INTERCOM OPERATION
CAUTION - As is standard practice with all aircraft avionics equip-
ment, be sure that the aircraft radio master switch is turned off
when you start up the aircraft engine.
SQUELCH SETTING - To use the Sport 200 S intercoms voice
activated (VOX) feature, the Squelch Control will have to be set.
This can be performed by the following procedure:
1. To set the Squelch controls it is helpful to have some back
ground noise present and music sources off. With aircraft
electrical power on, set the Sport 200 S ON/OFF switch to the
“ON” position. Turn the Sport 200 S unit volume (VOL) control
to the 10 o’clock position.
2. Turn the Squelch control all the way counter-clockwise. Now,
without speaking, rotate the Squelch control clockwise just
until you hear the background noise in your headset. Next,
rotate the Squelch counter-clockwise a small amount and
wait (approximately 1 second) until the background noise
disappears. Finally, make small adjustments until your voice
triggers the unit at comfortable speaking levels. This proce-
dure is necessary because the squelch is a “Fast-on, Slow-off”
system.
Once set, the intercom stays silent until someone speaks in their
headset microphone (mic). Then it instantly turns on and relays
the conversation. After about a second of no conversation the
intercom goes silent again.
In most aircraft the squelch controls will not need to be set again
unless you change the type of headsets used with the system.
In some high noise aircraft it is better to set the squelch during
climb or cruise.
PUSH-TO-INTERCOM - Install a separate momentary switch
at each headset position. To use the push-to-intercom feature,
turn the squelch control on the intercom fully counter-clockwise.
Then to activate, press the push-to-intercom switch(s). See the
separate Sport 200 S Installation Instructions Figure 4 for switch
wiring instructions.
VOLUME SETTING - The Volume control should be set to the
minimum level for best performance. Intercom Volume levels set
too high allows excessive background noise to enter the head-
sets and promotes whispering into the headset microphones.
These combine to degrade what is called the “signal to noise
ratio” which decreases intelligibility and interferes with proper
Squelch (VOX) operation.
MUSIC OPERATION - Music is controlled at the music source
itself. To adjust the music volume level set the volume control
on the music source. Similarly, to turn on or off the music use
the appropriate control on the music source. When the music
source is “on” the Sport 200 S system automatically mutes and
restores the music to the headsets at the appropriate time. The
Sport 200 S default mode of operation is to partially mute during
intercom conversations and full mute during any aircraft radio
communications
Sigtronics Sport 200 S Operating Instructions
Specialists in “SOUND” Management
Sigtronics Corp. 178 East Arrow Highway, San Dimas, CA 91773 (909) 305-9399
Made in the U.S.A.
(2 pages)
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