5
INSTALLATION
ATTACHING THE 
MICROPHONE HOLDER
You can attach the microphone holder to
either side of the transceiver or to anoth-
er location in your vehicle.
To attach the holder to either side of the
transceiver, secure the holder to the
side using the supplied screws, wash-
ers, and lock washers. 
To attach the holder to another location
in the vehicle, such as the dashboard,
follow these steps.
1. Using the holder as a template,
mark the positions for the mounting
screw holes at the desired location.
2. At each marked position, drill a hole
slightly smaller than the supplied
mounting screws.
Caution:
 Be careful not to drill into
anything behind the mounting sur-
face. 
3. Attach the holder at the mounting
location using the supplied 3 mm
machine screws, spring washers,
plain washers, and nuts. 
Note:
 If you cannot reach behind
the mounting surface to attach the
nuts on the machine screws, use the
supplied 3 mm plain washers and
self-tapping screws.
MOUNTING THE 
TRANSCEIVER
The most common mounting location for
this CB is under a vehicle’s dashboard.
However, if you plan to use the TRC-
503 as a base station, you can place it
on a desk, shelf, or table (see “Using the
Transceiver as a Base Station” on
Page 9.
If you are mounting the CB in a vehicle,
choose a location where:
• You can easily reach the CB.
• Wires and cables are clear of the
vehicle’s pedals or other moving
parts.
• The CB is not directly in front of
heating vents.
• All wires and cables can reach their
connection points.
21-1703a.fm  Page 5  Thursday, August 5, 1999  4:41 PM