Federal Signal Corporation Personnel Alerting System, Installation And Operation Instructions Manual

Page: 61 / 84

INSTALLATION
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good, due to the DMM not having the
ability to check the cable at high
frequencies. If that does not take care
of the problem, replace the antenna.
Yagi Antenna Mounting
1. See Figure 5.5 for reference. Install
antenna, (using installation bracket or
equivalent) as high as possible, that the
antenna cable and obstacles will allow,
and install on side of mounting structure
closest to the receiving station. Aim the
antenna directly at the receiving station
antenna.
Note A: Objects around the antenna will
affect antenna performance. Keep the
antenna pointed away from obstructions.
2. Ensure antenna cable connections are
tight. Seal all connection points with
heat shrink or tape and seal with Scotch
Coat or equivalent.
3. Apply RF power to the antenna at the
transmit frequency to be used at that
antenna, and check the VSWR
(reflected power). Reflected power must
be less than 10% of the forward power.
4.
If the VSWR specification is
unattainable, replace the cable (a simple
ohm meter check of the cable does not
guarantee that the antenna cable is
good, due to the DMM not having the
ability to check the cable at high
frequencies). If that does not take care
of the problem, replace the antenna.
5.10 Omni Antenna Installation
Fiberglass, no tune models
1. See Figure 5.6 for reference. Install
antenna (using installation bracket or
equivalent) as high as possible, that the
antenna cable and obstacles will allow,
and install on side of pole closest to the
receiving station.
Note A: Objects around the antenna will
affect the antenna, keep antenna away
from objects.
2. Ensure antenna cable connections are
tight. Seal all connection points with
heat shrink or tape and seal with Scotch
Coat, or equivalent.
3. Apply RF power to the antenna at the
transmit frequency to be used at that
antenna, and check the VSWR
(reflected power). Reflected power must
be less than 10% of the forward power.
4.
If the VSWR specification is
unattainable, replace the cable (a simple
ohm meter check of the cable does not
guarantee that the antenna cable is
good, due to the DMM not having the
ability to check the cable at high
frequencies). If that does not take care
of the problem, replace the antenna.