7. Operating Procedure
Assuming the previous installation instructions have been completed and cautions noted, and the power
amplifier is ready to receive a properly modulated RF signal, proceed with the following steps to place
the system in operation. The power amplifier has been factory aligned for a specific frequency (per system
specification), signal levels and optimum performance.
IT IS HIGHLY RECOMMENDED THAT YOU RUN YOUR SYSTEM INTO A DUMMY
LOAD BEFORE INSTALLING TO MAKE SURE THERE ARE NO DAMAGES CAUSED
IN SHIPPING AND THE UNIT IS RUNNING PROPERLY
1. Verify that all control and RF cables are tight and properly seated in or on the mating connector.
2. Plug in the desired audio source: analog (left and right for stereo), digital or MPX. For mono audio
use the Right XLR input.
3. With the power amplifier loaded into the antenna, cavity, alternative load, or dummy load power
up the amplifier by turning on power supply either via the ON/OFF switch on the back of the power
amplifier.
4. Verify that the power amplifier fans are all on. The power amplifier fans are powered via DC
voltage so this is an indication that the power supply is started and running. There may be fans
installed in the filter or power supply enclosures, if applicable.
5. The internal soft start circuitry will turn the bias voltages off until the power supply to the amplifier
pallets is fully stable. The front display indicates when the soft start is running with either a
displayed message when an LCD option is installed or via maximum attenuation when a touch
screen option is installed. Once complete, the Forward and Reflected Power, Power Supply, and
Temperature readings will appear on the display. Deviation is shown on the FM screen.
6. Adjust RF output power on the power amplifier to about 10% of rated forward power. The output
power level is adjusted from the power amplifier’s RF Levels screen. Turn the carrier on. If the
unit contains more than one final amplifier pallet (illustrated in Error! Reference source not
found. Error! Reference source not found.), ensure that the final pallet currents on the multiple
finals all match within 10% of each other. With multiple finals, the final pallet currents should
always match within this range under all operating conditions.
Front panel readings will vary slightly upon turn on. Steady state parameters can be
taken after approximately one hour.
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.
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