Wiring instructions, Figure 3 microphone jack, Page 3 – Sigtronics SCI-6 User Manual

Page 3

MOUNTING HEADPHONE AND MICROPHONE JACKS (See
Figure 3)

1. Locate the mounting areas. (One mic and one headphone jack

required for each headset). Again, make sure that the jacks will
not interfere with any aircraft control components. (Note that the
jack contacts will expand when a plug is inserted into the jack.)

2. Drill 3/8” diameter holes for headphone jacks and install.

3. Drill 1/2” diameter holes for the mic jacks and install with the

insulating washers supplied. (See Figure 3)

Note: If the aircraft already has pilot headset jacks, they can be
used for intercom, however, the mic jack must be re-wired as
follows:

1. Remove any existing wires from the tip, ring, and barrel

connections.

2. Connect the intercom white/black wire to the ring terminal.

3. Connect one end of a wire to the barrel terminal of the mic jack

and connect the other end to Point “A”.

4. Install insulating washers as necessary if the barrel of the mic

jack is mounted in metal.

For the headphone jack, remove any existing wires from the
tip connection. Connect the green wire (J2 pin 1) to the tip
connection.

WIRING INSTRUCTIONS

Connections should be made as shown in Figure 4 and indicated
in Table 1 and 2. If longer wire lengths are required, use a good
quality hook-up wire - 22 gauge or larger. Although not necessary,
shielded audio wire can be used if desired. This can simplify the
wiring process.

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Figure 3

Microphone Jack

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page 3

This manual is related to the following products:

SCI-4