Sigtronics SPCC-3 - Manual (Page 3)

OFF OFF
FM-1
XMIT SELECT XMIT SELECT SPCC-3
FM-2 A/C
OFF OFF OFF
FM-1 FM-2 A/C
OFF
SQ
REC VOL
INTERCOM INTERCOM
REC VOL
ON
BYPASS VOL SQ VOL
MIC
XMIT SW
HDPH
MIC
XMIT SW
HDPH
cally 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 he-
licopter, please contact Sigtronics for advise on
adapting the general aviation plugs to the heli-
copter jacks.
3. FM-1 Radio: An interface cable for the FM-1 ra-
dio is needed to connect it to the SPCC. 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 manufactur-
ers, no one cable will work for all radio transceiv-
ers. Therefore, the FM-1 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 de-
cide to purchase completed interface cables,
Sigtronics has an extensive cable making facility
and can provide you with them at minimum cost.
We will need to know what length cable you re-
quire and the manufacturer and model number
of the radios you wish to use.
If you would rather have your radio technician
make the cables, the FM radio interface cable
connector pin assignments and some typical
cable wiring examples are located on page 7.
Two five pin connector plugs are supplied with
each SPCC unit for this purpose. You will also
need the radio mating connectors and con-
nection schematics or hook-up drawings for
your particular FM radios. These can usually
be obtained from the radio manufacturer. 4.
FM-2 Radio: Same as step 3.
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.
The SPCC is compatible with all standard general
aviation type portable push-to-talk switches. The
male plug on the PTT switches plug directly into
the XMIT SW jacks of the SPCC unit. If your PTT
FM 1
Radio
FM 2
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-1 Radio
Interface Cable
FM-2 Radio
Interface Cable
FM-2 Radio
Interface Jack
FM-1 Radio Mic Adjust
FM-2 Radio Mic Adjust
* Portable
Transmit Switch
A/C Radio Mic Adjust
FM-1 Radio
Interface Jack
LED Power
Indicator
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