Sigtronics Sport 200 S Operating Instructions

Sigtronics Sport 200 S Operating Instructions
Sigtronics Sport 200 S Operating Instructions
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 Instructions.
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.
Three controls are provided on the Sport 200 S units:
disappears. Finally, make small adjustments until your voice
triggers the unit at comfortable speaking levels. This procedure is necessary because the squelch is a “Fast-on, Slow-off”
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.
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.
CAUTION - As is standard practice with all aircraft avionics equipment, 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
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 headsets 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
Specialists in “SOUND” Management
Sigtronics Corp. 178 East Arrow Highway, San Dimas, CA 91773 (909) 305-9399
Made in the U.S.A.
MUSIC MUTE LEVEL DURING ICS - During normal intercom
operation there are three possible muting levels, full, partial, or
none. Partial mute is the factory default. Alternately, “no mute”
or “full mute” modes are user selectable prior to intercom installation. Note: during radio transmission and reception, the music
will always full mute. This is for communication safety reasons.
Since the intercom is not needed during solo flights, it may be
turned to the “OFF” position. 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-transmit switch. If the aircraft
radio does not provide sidetone, then switch intercom mode to
the “ON” mode. To hear music, the intercom will also have to be
in the “ON” mode.
If power to the Sport 200 S unit fails, the pilot can still transmit
and receive on the aircraft radio(s) (assuming the radio(s) are still
functioning). If a problem is ever suspected, switch the intercom
“OFF”. In this mode you will still be able to transmit and receive
on the aircraft radio(s) from the pilot’s position. If the radio does
not provide sidetone, then the pilot will not hear his voice in this
“FAIL-SAFE” or “OFF” mode.
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 Sport 200 S stereo phone jacks. A monaural
plug in a stereo jack shorts out one of the audio channels. This
will not damage the Sport 200 S system in any way but will cause
reduced performance. 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 rewired for stereo.
3. Install the Sigtronics Sport 200 S system for monaural operation. See note 5 on page 2 in the “Wiring Instructions” section
of the Installation Instructions.
Model: SPA-200S
Stereo Music Systems
Most automotive stereo units operate from 12V-14V sources. If
you want to use a 12 volt music source in a 28 volt aircraft do
not connect them directly to power. Regulators or converters are
available to permit operation from 24V-28V sources.
Some AM-FM music receivers are capable of causing interference
with aircraft COM and NAV receivers. The aircraft panel should be
placarded accordingly. Most player only units (cassette or CD) do
not cause interference with aircraft receivers.
Line level stereo music outputs can also be used into the Sport
200 S system. Some line level outputs however, are a fixed level
and are not adjusted by the devices volume control. If this is the
case you will not be able to change the volume of the music you
hear in the headsets. Headphone level or Speaker level outputs
would be better in this case.
Stereo Headsets
The Sigtronics Sport 200 S systems are designed for use with
general aviation Stereo headsets with high impedance speakers
(300 to 600 ohms). Headsets with low impedance (less than 100
ohms) speakers should not be used with Sport 200 S systems
without modification. Contact Sigtronics for details. In general,
headsets with speakers of high and low impedance and/or
unmatched audio efficiencies should not be used together
without modifications.
Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
Phone: (909) 305-9399
E-mail: [email protected]
Web Site:
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