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2.4.3
Maintaining System Performance
Over time, any communications system requires a degree of preventative maintenance to
ensure peak operating efficiency. Periodic checks of master and remote sites should be
made to identify and correct potential problems before they become threats to system
operation. The following areas should be given special attention:
Antennas and Coaxial Cable
Visually inspect the antenna and coaxial cable for physical damage, and make sure the
coaxial connections are tight and properly sealed against the weather. When using
directional antennas, be sure that the antenna heading has not shifted since installation.
The SWR (Standing Wave Ratio) of the antenna system can be checked from time to time
using a through-line wattmeter. Defects in the antenna system will frequently show up as
reflected power on the meter. It is good practice to accept only a maximum reflected power
of about 5%; this corresponds to an SWR of approximately 1.5:1. For any condition
exceeding this value, search for and correct the cause – damaged antenna, defective or
improperly installed connectors, water in the coaxial feedline, etc.
2.4.3.1
Cable Connections
All power, data, and ground connections should be secure and free of corrosion.
2.4.3.2
Power Supply
The voltage of the station power supply should be measured to verify that it is within the
operating specifications for the radio. If possible, the radio should be keyed during this test
to ensure maximum current draw from the supply. Batteries, if used, should be checked for
charge level and signs of leakage or corrosion.
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