WIRING INSTRUCTIONS
Figure 4 and Table 1 show how to make the wiring connections.
If you need longer wire lengths, use good quality hook-up wire,
22 gauge or larger. Shielded audio wire can be used, however, it
is not necessary. This can simplify the wiring process.
*1. The blue wire from Pin 3 must be connected to the aircraft
radio headphone output - NOT the speaker output.
*2. Connect all intercom mike jack grounds to a single aircraft
chassis ground point - Point “A” - See Figure 4. (Use the
black washers supplied to insulate intercom mike jacks
from aircraft chassis ground).”
*3. Do NOT connect transmit switches to white (key) wire.
*4. Red wire may be connected to either 12V (I 4V) or 24V (28V)
power source. No switching or adjustments are necessary
to operate from either source.
*5. Tan wires (pins 8 and 9) and white / orange wires (pin 10)
are only used on installations that require extra intercom
positions.
**NOTE: Use this intercom central grounding point so that no unwanted
electrical noise, such as alternator whine or strobe noise, will be induced into
the intercom system through the grounds. Each intercom mike jack barrel
should be insulated from ground and connected back to Point ”A” on its
individual ground wire. Similarly, both intercom ground wires (pin 4) and the
push-to-talk switch grounds should be connected back to Point “A”. It is not
necessary, however, to connect the headphone jack barrels to Point “A”. They
can be grounded where you mount them or some place nearby.
Table 1
Pin Wire Color Function Connection
1 White / Black Pilot Mic Input Ring Terminal of Pilot Intercom Mic Jack
2 White / Red Pilot Transmit Switch Input Pilot Transmit Switch (PTT) (Switch to Ground to Transmit)
3 Blue *1 Headphone–Radio & Intercom Output Radio Headphone Output & Intercom Headphone Jacks
4 Black **2 Intercom Central Grounding Point Aircraft Chassis Ground
5 White *3 Radio Transmit Key Control Output Tip Terminal of A/C Hand Mic Jack or Key Input of Audio Panel
6 Brown Transmit Mic Audio Output Ring Terminal of A/C Hand Mic Jack or Mic Input of Audio Panel
7 Red *4 12 thorough 24 VDC Power Input Intercom Circuit Breaker
8 Tan *5 Passenger Mic Input Ring Terminal of Passenger Intercom Mic Jack
9 Tan *5 Passenger Mic Input Ring Terminal of Passenger Intercom Mic Jack
10 White / Blue No Connection
11 White / Orange Passenger Mic Input Ring Terminal of Passenger Intercom Mic Jack
12 Yellow Bidirectional Intercom Link To Other Intercom Yellow Wire
* See Wiring Instructions
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