Sigtronics SPCC-3 - Manual (Page 2)

TECHNICAL HIGHLIGHTS which make the SPCC
unbeatable are:
Fail-Safe Bypass Switch allows the pilot to oper-
ate the aircraft radios even if the unit is turned off.
Automatic Sidetone Generation lets the pilot
and observer hear what the other is transmitting
over the radios.
Separate Transmitter Microphone Gain Ad-
justments adjust the aircraft radio and the two
FM radios independently.
Excellent RF Immunity guarantees clean, clear
transmissions.
Power Requirements: A standard cigarette
lighter socket (11 to 34 VDC) or a battery pack.
Standardized to general aviation headsets and
portable push-to-talk switches. (The unit can also
be wired into permanently installed PTT switch-
es). Helicopter headsets will also work with the
unit if headset plug adapters are used.
APPLICATIONS
• Airborne Law Enforcement - Small police de-
partments to large organizations like the FBI.
• Civil Air Patrol / Coast Guard - Air search and
rescue operations.
• Medevac Helicopters - Medical emergency air-
craft
• Airborne Fire Control
• Forestry Departments
• Wild Life Organizations - Survey and tracking
operations
• TV News Crews
• Airborne Traffic Reporters
• Ground Operations requiring more than one
radio.
• Additional aircraft VHF radio capability - Add
one or two inexpensive hand-held aircraft radios
without installation costs.
CONTROL FUNCTIONS
ON / BYPASS - Power Switch - In “ON” position; sup-
plies power to all SPCC circuits. In “BYPASS” posi-
tion; disables all unit functions, and connects pilot
directly to the aircraft radios. A fail-safe feature!
VOL - Intercom Volume - Adjusts intercom volume
level.
SQ - Intercom Squelch - Adjusts VOX operation of
the intercom for variations in headset microphones
and background noise levels.
XMIT SELECT - Transmit Select - Used to select
which radio to transmit on.
OFF/A/C, OFF/FM-1, OFF/FM-2 - Receive Select -
Used to select which radio is heard in any combina-
tion. Note: The radio selected by the XMIT SELECT
switch is always heard regardless of the positions of
the receive select switches.
REC VOL - Receive Volume - A general control used
to set the volume level of the aircraft radio(s), and
both FM radios.
A/C RADIO MIC GAIN ADJ - Aircraft Radio Micro-
phone Gain Adjustment - Sets the transmit mic au-
dio level for the aircraft radio(s).
FM-1 RADIO MIC GAIN ADJ - FM-1 Radio Micro-
phone Gain Adjustment - Sets the transmit mic au-
dio level for the FM-1 radio.
FM-2 RADIO MIC GAIN ADJ - FM-2 Radio Micro-
phone Gain Adjustment - Sets the transmit mic au-
dio level for the FM-2 radio.
SPCC INSTALLATION
The SPCC requires seven simple connections to put
it into operation. The power cord, the aircraft ra-
dio, the FM-1 radio, the FM-2 radio, the push-to-talk
switches, and the headsets must all be connected
for the system to work as designed. But do not fear,
Sigtronics has simplified the connection process, so
it will just take a few moments. Refer to the SPCC
connection drawing Figure 1 on page 3.
1. Power Cord: The four foot power cord with LED
Power Indicator is designed to plug directly into a
standard cigarette lighter socket. The LED indica-
tor will be on if power is available, it will be off if
no power or reversed socket wiring. Note: The
LED shows power available, not SPCC On or Off.
The SPCC will run on 11-34 VDC, so it automati-
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