Sigtronics SRE-4 - Manual

TRANSCOM is a voice actuated aircraft intercom with the
capability for transmitting through the aircraft radio by the mere
push of a button. It was designed for simplicity of use.
Three controls are provided to operate the unit.
POWER SWITCH
--
Turns unit on and off.
VOLUME CONTROL
--
Controls the intercom volume. (The radio
volume is controlled conventionally.)
SQUELCH CONTROL- Controls the threshold of amplifier turn-
on. This control is normally used to adjust for variations in
background noise found in different aircraft.
HARDWARE PROVIDED:
Two Microphone Input Jacks
--
They accept the standard aircraft
mike plugs (i.e., carbon or amplified dynamic microphone).
Two Output Jacks
--
They accept the standard .250” aircraft
headphone plug.
Transmitting from both positions is possible on a one-at-a-time
basis. Each position disables the other while transmitting.
OPERATING INSTRUCTIONS
STEP 1. - INTERCOM MODE
A.Turn the power switch on.
B.Set the volume control to a low level.
C. Adjust the Squelch Control clockwise until background noise
increases or the voice is heard by speaking into mike. Rotate
the squelch counterclockwise until the noise diminishes. Then
make small adjustments until
SIGTRONICS CORPORATION
178 East Arrow Highway
San Dimas, California 91773
(909) 305-9399
the voice triggers the unit on satisfactorily. Small ad-
justments may be necessary if the aircraft background
noise changes significantly, such as from idle to full
power.
STEP 2.
—
TRANSMIT MODE
When ready to transmit, depress the Transmit Switch
and your voice is automatically transmitted via the
aircraft radio.
STEP 3— RADIO MONITORING
When the unit is connected as in “WIRING
INSTRUCTIONS” radio monitoring is automatic. The
radio monitor circuit is always active, even with the
TRANSCOM Power Switch in the OFF position.
HELPFUL HINTS
1. Position the boom mike in close proximity to the mouth,
as is the practice with a hand held mike, for best results.
2. Maintain minimum acceptable volume when using
TRANSCOM, particularly in low noise environments.
3. The hand held mike may be left plugged into the aircraft
mike input jack and used conventionally, However, the
TRANSCOM must be switched off during transmitting.
Radio reception will continue through the headphone,
even with TRANSCOM switched off.
4. When transmitting, the intercom is automatically
switched off and your voice is heard via the aircraft radio
sidetone return. In cases where there is no sidetone
return, nothing will be heard.
5. The push-to-talk switch circuit must have less than 5
ohms resistance for satisfactory operation.
SIGTRONICS “TRANSCOM” INSTALLATION AND OPERATING INSTRUCTIONS (REMOTE 4 WAY)
HEADPHONE
JACKS
4
MIKE
JACKS
4
SQUELCH
CONTROL
VOLUME
CONTROL
SWITCH
MOUNTING
HARDWARE
15 CONDUCTOR
CABLE
FIGURE 1