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MOBILE ANTENNAS
A few general rules should help you install any mobile antenna properly.
1. Keep it as far as possible from the main bulk of the vehicle.
2. Keep as much of it as possible above the highest point of the vehicle or
3 .
During operation, it must be vertical.
Thus, it should be mechanically
Ag _
figid so it will remain vertical when the vehicle or boat is in motion.
4,
Mount
it as far as possible from sources of noise (ignition
em,
gauges, etc.) and keep the transmission
line away from thesaoicdy
sources.
| Amantenna mounted in a boat requires a ground.
This can be either a
metal hull or a ground made of tin-foil or copper sheeting.
This ground
should
cover an area of 12 square feet (1 m2) or more.
Be sure the
_ Transceiver also has an adequate ground.
Our Catalog Number 21-912
has been designed so no additional ground is needed, so if you use this
antenna it will save you an extra bit of work.
There are two types of mobile CB antennas: a full-length whip or loaded
whip.
Your local Radio Shack store has a complete line of both types and
the salesperson can help you choose the best antenna for your needs.
A vertically polarized whip antenna is best suited for mobile service.
It is
omni-directional
and
can
be the
loaded
type
or
a full quarter-wave
(quarter-wave being more efficient).
There are many possible antenna locations on a car.
Four of the most
popular are shown and discussed below.
BUMPER
ee
tt
res
ee
oe
a
——OOlF,
FRONT
~—
ae
COWL
MOUNT
ROOF
MOUNT
—
In this position the antenna
radiates equally in all
directions.
Since the normal
% wavelength
whip antenna
is too long
(102'' or 2.6 m) for roof mounting on a vehicle, the antenna is shortened
and a loading coil is used to provide the proper electrical length.
Our
Fiberglass
Roof-Mount
Catalog Number
21-925,
is a good
durable
antenna.
,
—
te Ye pe
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