CHAPTER 2 INSTALLATION
LOCATION
Plan the location of the transceiver and microphone bracket before starting the
installation. Select a location that is convenient for operation and does not
interfere with the driver or passengers. In automobiles, the transceiver is
usually mounted below the dash panel with the microphone bracket beside it.
MOUNTING THE RADIO
The transceiver is supplied with a universal mounting bracket. When mounting
the bracket and radio to your car, make sure it is mechanically strong. Also,
provide a good electrical grounding connection to the chassis of the vehicle.
Proceed as follows to mount the transceiver :
1. After you have determined the most convenient location in your vehicle, hold
the transceiver with mounting bracket in the exact location desired. If
nothing will interfere with mounting it in the desired position, remove the
mounting bolts. Before drilling the holes, make sure nothing will interfere
with the installation of the mounting bolts.
2. Connect the antenna cable plug to the standard receptacle on the rear panel.
Most transceiver antennas are terminated with a type PL-259 plug and mate
with the ANT receptacle.
3. Connect the red DC power input wire (with the fuse) to +13.8V DC. This
wire extends from the rear panel. In automobile installation, +13.8V DC is
usually obtained from the accessory contact on the ignition switch. This
prevents the set being left on accidentally when the driver leaves the car and
also permits operating the unit without the engine running. Locate the
accessory contact on most ignition switches by tracing the power wire from
the AM broadcast receiver in the car.
4. Connect the black lead to -13.8V DC. This is usually the chassis of the car.
Any convenient location with good electrical contact (remove paint) may be
used.
5. Mount the microphone bracket on the right side of the transceiver or near the
transceiver, using two screws supplied. When mounting in an automobile,
place the bracket under the dash so that the microphone is readily accessible.
IGNITION NOISE INTERFERENCE
Use of a mobile receiver at low signal levels is normally limited by the
presence of electrical noise. The primary source of noise in automobile
installations is from the generator and ignition system in the vehicle. Under
most operating conditions, when signal level is adequate, the background noise
does not present a serious problem. Also, when extremely low level signals are
being received, the transceiver may be operated with vehicle engine turned off.
The unit requires very little current and therefore will not significantly
discharge the vehicle battery.
Even though the transceiver has ANL and NB controls, in some installations
ignition interference may be high enough to make good communications
impossible. The electrical noise may come from several sources. Many
possibilities exist as variations between vehicles require different solutions to
reduce the noise.
ANTENNA
A vertically polarized, quarter-wavelength whip antenna provides the most
reliable operation and greatest range. Shorter, loaded-type whip antennas are
more attractive, compact and adequate for applications where the maximum
possible distance is not required. Also, the loaded whips do not present the
problems of height imposed by a full quarter-wavelength whip.
Mobile whip antennas utilize the metal body of the vehicle as a ground plane.
When mounted at a corner of the vehicle they are slightly directional, in the
direction of the body of the vehicle. For all practical purposes, however, the
radiation pattern is non directional. The slight directional characteristic will be
observed only at extreme distances. A standard antenna connector (type
SO-239) is provided on the transceiver for easy connection to a standard
PL-259 cable termination.
If the transceiver is not mounted on a metal surface, it is necessary to run a
separate ground wire from the unit to a good metal electrical ground in the
vehicle. When installed in a boat, the transceiver will not operate at maximum
efficiency without a ground plate, unless the vessel has a steel hull.
Before installing the transceiver in a boat, consult your dealer for information
regarding an adequate grounding system and prevention of electrolysis between
fittings in the hull and water.
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