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11 MICROPHONE
INSTALLATION
11.1 CH-103 AND CH-103PA CONNECTIONS
There are several versions of microphones available for use with the radio. In all cases, there is a 14-pin
connection to the front panel of the Control Head.
1.
Plug the microphone’s 14-pin connector to the Control Head’s microphone connector as follows:
Align the white arrows on the mating connectors, then push the cable’s connector into the mate—the
outer ring of the connector will rotate during the insertion. The outer ring will lock into place (arrows
aligned) when full connection is made and a click will be sensed.
NOTE
For safety reasons, the mating of the 14-pin microphone connector can be pulled out
with sufficient force. This will prevent incidental cable damage or personal injury if a
snag occurs. However, the cable must be stretched substantially before enough force is
exerted to unlock these mating connectors.
A microphone clip is included with the microphone head. The radio can be configured to provide a
monitor function when the microphone is cradled in the clip.
2.
Using the microphone clip as a template, drill mounting holes in the surface of the selected location.
3.
Attach the microphone clip to the mounting surface using self-threading screws.
4.
The microphone clip must be grounded to the vehicle’s chassis. If not mounted to a grounded metal
surface, complete this requirement by adding a jumper wire attached from chassis ground to the clip.
11.2 COMMON MICROPHONE INTERFACE CONNECTIONS
(CH-103PA ONLY)
Microphone audio can be channeled to an optional Federal Signal Electronic Siren/Light Control System
(purchased separately) for broadcasting through a public address (PA) speaker. This feature is only
supported through the Common Microphone Interface of the CH-103PA. See and follow the procedure
below to make the connections:
1.
Connect the 4-pin connector of the Common Microphone Interface Cable (part number
MACDOS0014-RN050 for right-angle connector or MACDOS0014-NN050 for straight) to the
“
AUX
” connector on the back of the CH-103PA. See Figure 9-3. Visually align the ¾-moon-
shaped keys of the connectors, and then push and turn the outer locking ring of the cable
connector clockwise until it stops. A mild click will be sensed to confirm proper mating.
2.
Route both the black cable and purple wire through the vehicle’s channeling to the Federal Signal
unit. Remove interior panels, door kick panels, etc., as necessary. Protect the cable from possible
chafing as necessary.
3.
Connect the phone plug at the end of the black cable to the MIC input jack on the Federal Signal
unit.
4.
Using the supplied butt-splice, strip and crimp the purple wire to the purple wire in the Federal
Signal unit’s cable harness. Fifty feet of this wire is supplied; cut off and discard excess length.
5.
Loop and tie-up the cable and wire as necessary.
6.
Follow the installation instructions included with the Federal Signal unit to complete its
installation, if necessary.