Section
Ill
Installation
LOCATION
Prior
to
beginning operation
of
the transceiver, a basic installation must be
prepared. Installation
of
the transceiver itseif
is
a rather simple procedure.
In selecting the location for
the
unit, two basic factors must be considered.
1.
Access
to
a 120V,
60
Hz power source.
2. The location must be convenient for running the antenna lead-in cable
if
an outside antenna installation
is
proposed.
BASE
STATION
ANTENNA
Since
the
maximum allowable power
output
of
the
transmitter
is
limited
by
the FCC, the antenna
is
the most
important
factor affecting transmission
distance. Only a properly matched antenna system will allow maximum power
transfer from
the
50-ohm transmission line
to
the
radiating element.
The recommended method
of
antenna tuning
is
to
use an in-iine watt-meter
or VSWR bridge
to
adjust the antenna tuning for minimum reflected power on
channel 21.
The radio may be used with any type
of
50-ohm base station antenna. A
ground plane vertical antenna
will
provide the most uniform horizontal coverage.
This type
of
antenna is best suited for communication with a mobile unit.
For
point-to-point operation where
both
stations are fixed, a directional beam will
usually increase communicating range since this type
of
antenna concentrates
transmitted energy in one direction. The beam antenna also allows the receiver
to
"hsten"
in only one direct10n thus reducmg interfering signals.
Antenna height
is
an
important
factor when maximum range
is
desired.
Keep the antenna clear
of
surrounding structures or foliage. FCC regulations for
base station antenna height are:
8
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