1
Safegua
rds
2
Terms and
Warranty
3
Principl
e o
f
Operati
on
4
Ins
talla
tion
5
Operati
on
6
C
ont
rol Syst
em
7
RF Componen
ts
8
Power
Supp
ly
9
Maintenan
ce
10
Troubleshoo
ting
7. Ideally, the RFL Power should read zero. However, should a high VSWR be
detected, the system will automatically fold back. Under normal conditions, a
well installed and setup system should indicate RFL power less than 3% of
FWD power.
8. Adjust RF output power on the power amplifier to desired level. The output
power level can be adjusted from the power amplifier’s RF Levels screen.
Keep in mind that the system will fold back or shut down (depending on
severity) should the forward RF output power level exceed the trip overdrive
point.
Pease note that 100% should be the maximum FWD power. Typically,
customers run the systems at 90% to avoid occasional AC power line spikes
or transients from tripping the shutdowns. The difference of 10% will provide a
marginal difference in range (tower height will have a much more significant
effect on range in the case of over-the-air) or cavity excitation.
9. Verify that the power supply reads correctly (see supplied final inspection
sheet for factory settings of power supply levels) on the display of the power
amplifier. You should see no more than 3% fluctuations in DC supply voltage,
and even less with a properly conditioned AC source to the power supply.
10. Look at the transmitted output using suitable test equipment. If the output
quality is unsatisfactory, check the input signals, connections to the antenna
system, antenna and transmission line VSWR, and the physical condition of
the antenna.
11. Select the appropriate input from the FM Controls screen on the front panel.
12. Adjust the attenuation for the input if needed from the Audio Levels screen on
the front panel. Check the modulation level on the main RF Display or FM
display on the front panel.
13. After warm up, compare the temperature of the equipment from the front
display to the temperature recorded in the final inspection sheet, included in
shipping. Assuming ambient temperatures are close (our factory is typically
around 18 to 25
˚
C), your temperature reading should be very close to the
factory reading. Use your temperature measurement as a method to monitor
fan performance (though on higher power units, fan current is also
monitored). A fan failure or air blockage will show an increase in temperature,
assuming ambient temperature is not varying.
