Sigtronics SPCC-2 - Manual (Page 3)

AUX BOTH
AUTO REC
VOL
XMIT
SELECT
SPCC-2
FM
OFF
OFF
SQ
INTERCOM INTERCOM
ON
BYPASS VOL
A/C
SQ VOL
MIC
XMIT SW
HDPH
MIC
XMIT SW
HDPH
AUX BOTH
AUTO REC
VOL
XMIT
SELECT
FM
OFF
OFF
A/C
automatically adjusts to 12 or 24 volt aircraft. The
SPCC can also be powered by an auxiliary battery
pack, if desired.
2. Aircraft Radio: The mic and headphone cords
on the unit are designed to plug into the mic
and headphone jacks in the panel of the aircraft.
If the aircraft does not have either one of these
jacks, they can be installed by any qualified
avionics technician. If you plan to use the SPCC in
a helicopter, please contact Sigtronics for advise
on adapting the general aviation plugs to the
helicopter jacks.
3. FM Radio: An interface cable is needed to
connect the SPCC to the FM radio. On one end
of the cable will be a five pin connector to plug
into the jack on the top of the SPCC. On the other
end will be whatever is required by your FM radio.
Since virtually any radio can be used and there
is little standardization among manufacturers,
no one cable will work for all radio transceivers.
Therefore, the FM radio interface cable will have
to be fabricated for your particular radio. This
cable can be supplied to you by Sigtronics or
made up by your radio technician. If you decide to
purchase a completed interface cable, Sigtronics
has an extensive cable making facility and can
provide you with one at minimum cost. We will
need to know what length cable you require and
the manufacturer and model number of the radio
you wish to use.
If you would rather have your radio technician
make the cable, the FM radio interface cable
connector pin assignments and some typical
cable wiring examples are located on page 7. A
five pin connector plug is supplied with each SPCC
unit for this purpose. You will also need the radio
mating connector and connection schematic or
hook-up drawing for your particular FM radio.
These can usually be obtained from the radio
manufacturer.
4. Auxiliary Radio: If you are using an auxiliary
radio, then a simple interface cable is also needed
to connect the SPCC to the auxiliary audio
input source. The SPCC accepts a standard 1/8”
monaural mini plug.
5. Push-to-Talk Switches: In order for pilot and
observer to transmit on their selected radios,
they will each need a push-to-talk (PTT) switch.
Page 3
Auxiliary
Audio
Source
FM
Radio
Aircraft
Headphone
Jack
Aircraft
Hand Mic
Jack
Cigarette Lighter or
Portable Battery Pack
* Portable
Transmit Switch
Mic Plug
Transmit Plug
Headphone Plug
Mic Plug
Transmit Plug
Headphone Plug
FIGURE 1
* The female jack on portable
push-to-talk switch is not used.
FM Radio
Interface Cable
FM Radio
Interface Jack
FM Radio
Mic Adjust
* Portable
Transmit Switch
A/C Radio
Mic Adjust
Aux. Audio
Input Jack
LED Power
Indicator