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A reading less than two is acceptable. Higher readings indicate a problem
in the antenna system. Problems may be caused by humidity, vibration,
a mistuned antenna, or corrosion. Check both ends of the coaxial cable
connector. Also check for damage to the cable or antenna. Tune the
antenna according to the instructions that came with the antenna.
RF Meter: Measures RF Output Power for transmitter. To use, set the
meter switch at S/RF. Press microphone PTT switch to read transmitting
power.
S-Meter: Measures incoming signal strength. To use, set the meter switch
at S/RF. The meter swings to indicate signal strength.
i.e. S 3, S 5, S 7 . . .
PREVENTIVE MAINTENANCE
Every six months:
1. Check the Standing Wave Ratio (SWR). See page 11.
2. Be sure all electrical connections are tight.
3. Inspect antenna coaxial cable for wear or breaks in shielding.
4. Be sure all screws and mounting hardware are tight.
MAINTENANCE
The PC78LTD is designed to give you years of trouble-free service. There
are no user-serviceable parts inside. Except for the fuse in the DC power
cord, no maintenance is required.
To replace a blown fuse:
1. Press ends of the fuse holder together. Twist to open.
2. Carefully separate the two pieces.
3. Remove the fuse and inspect. If blown, replace with the same
type fuse. Use only the fuse specified for your PC78LTD. Failure to
do so may void your warranty.
12
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