CONTROLS:
Power Switch: On-Off
Volume Control: Controls intercom volume.
Squelch Control: This control is normally used to adjust for variations
in background noise found in different aircraft.
Auxiliary Audio Input Jack: Plug in your portable music source and
enjoy music or instructional recordings. Accepts 1/8” mini monaural
headphone plugs. Stereo and monaural adapters are available from
Sigtronics for your interface needs.
Auxiliary Audio Output Jack: Record intercom or radio work. Terrific
for instructional purposes.
STEP 1 – How To Use The Transcom II:
A. Connect the Sigtronics Transcom as illustrated in the Connection
Schematic. Be certain that the transmit switch and corresponding headset
mic plugs are connected on the same side as shown in the schematic,
since the mic input on the opposite side is disabled when a transmit
switch is activated.
B. Put on headset(s) and position the boom mic close to the mouth, as you
would with a hand-held mic. Voice clarity is best when the mic is at one
side of the mouth and 1/4” from the lips.
C. Set audio panel to “Headphone” position, if applicable.
D. Turn power ‘ON’ and set the volume control to a low level. (1/4th to
1/3rd open for best signal to noise ratio). Maintain minimum acceptable
volume for hearing protection.
E. Adjust squelch control clockwise until background noise becomes
audible. Then rotate counter-clockwise small, incremental amounts until
background noise disappears. This procedure is necessary because the
squelch is a ‘fast on, slow off’ circuit. Small adjustments may be necessary
if aircraft background noise changes significantly, such as from idle to
full power.
STEP 2 – Transmit Mode:
To transmit, depress the transmit switch and your voice is automatically
transmitted via the aircraft radio. When transmitting, your voice or side-
tone is heard in all headsets connected to the Trancsom II. The Transcom II
automatically provides simulated transmit side-tone. You may also transmit
from the pilot’s position with the unit ‘OFF’. (Fail Safe feature).
A small, square, trimmer potentiometer is provided inside the unit for
adjusting the mic input level to the radio. In the event of over-modulation
or reports of weak transmissions, an appropriate adjustment can be made.
Clockwise rotation of the screwdriver adjustment increases the mic output
level.
STEP 3 – Radio Monitoring:
When the unit is connected as in Step 1, radio monitoring is automatic.
The radio monitor circuit is always active, even with the intercom power
switch in the ‘off’ position or in the event of a Transom failure. No switching
is necessary. A ‘fail-safe’ feature.
BATTERY REPLACEMENT INSTRUCTIONS:
1. Turn unit “OFF”
2. Remove battery door by pressing on the center as you slide it out.
3. Remove the battery and disconnect the battery connector.
4. Connect a new battery and insert it into the unit the same way as the
original.
5. Slide the battery door back in and resume normal operation.
Battery Replacement Instructions for SPO-42, -62, -82 and -102:
The only indication of a low battery will be the lack of power, and neither
the front unit nor rear unit(s) will function. There will never be an indication
of low rear unit batteries, since the front unit battery will carry all units, if
needed. Therefore, make it a practice to change all batteries at the same time.
2
Model SPO-42
1-9-2012 trcm2.pdf
MIKE
XMIT SW
HDPH
MIKE
XMIT SW
HDPH
SQ
BATTERY
POWERED
ON
OFF
INPUT
AUX.
AUDIO
OUTPUT
VOL
Sigtronics Transcom II Connection Schematic
Aircraft Handmic
Jack
Aircraft Headphone
Jack
Aircraft Auxiliary
Power Jack
Squelch
Control
Volume
Control
On–Off Power
Control
Headphone Plug
Transmit Switch Plug
Microphone Plug
Pilot’s Jacks
Headphone Plug
Transmit Switch Plug
Microphone Plug
PTT-ICS*
Portable
Transmit
Switch
PTT-ICS*
Portable
Transmit
Switch
Microphone
Output
Cable
Audio (Headphone)
Input Cable
Power Input
Cable
LED Power
Indicator
Note: Transmit with the unit ‘OFF’ is
only from the pilot’s position.
* If your Push-To-Talk switch has a
female jack do not connect it.
