5
INSTALLATION
INSTALLATION
A. Read the BEXT warning, shipping and warranty information at the front of the manual.
B. Handle the unit as carefully as possible.
C. Unpack the amplifier and, before any other operation, check that the amplifier isn't damaged and
that all controls on the front and rear panel are in good condition.
D. Save the original packing materials.
MECHANICAL / ELECTRICAL
A. Operate the unit with adequate ventilation in a relatively cool environment.
B. Check that the A.C. supply is adequate for the expected power consumption and that the line
voltage matches the taps in the unit with minimal line voltage variation. If the line voltage
fluctuates frequently and extensively, a voltage regulator is recommended. A surge/transient
suppression system is also highly recommended.
C. Never operate the unit without a dummy load or properly matched antenna load.
D. If you are going to operate solid state equipment as a final amplifier in a very crowded
transmitting site, it is suggested that a fundamental frequency/cavity bandpass filter be inserted in
the line between the equipment and the antenna. The BEXT staff can assist you.
OPERATION
A. Open the cover and check the voltage setting on the transformer. The transformer offers several
taps for different voltages. If it is found necessary to move the taps, move only the A.C. primary
taps. Do not move the fan wires which are connected to the same terminal block.
B. Turn the "power adjust" of the exciter to zero and turn the power switches to the "off" position of
both the amplifier and the exciter. Set the exciter to the desired frequency of operation.
C. Connect the RF output of the exciter to the input of the amplifier. The input of the amplifier uses
a type "N" connector. Use good quality cable to prevent RF leakage. Connect the RF output of
the amplifier to a suitable dummy load or antenna.
D. Connect the exciter A.C. cord to the plug provided on the rear of the amplifier. This will provide
protection by shutting down the exciter when an alarm condition is detected by the amplifier.
Connect the amplifier A.C. cord to the A.C. supply.
E. Turn the amplifier power on. The power indicator should come on and the fans should begin
running. CAUTION:
Do not apply RF drive unless the fans are running properly. If the unit does
not come on the user should check the following:
1. Check the A.C. line fuses.
2. Check the A.C. line connections.
3. Check the internal transformer taps and the fan/blower itself.
F. Turn on the exciter. The power indicator light should come on and a lock indication should come
on. The exciter blower should also be running. Check all power supply voltages on the amplifier
and exciter to ensure they are correct before proceeding. The amplifier voltage should be
approximately 28 volts. Exciter voltages will be marked on the front panel of the exciter and will
vary with the type of exciter.
G. Set the power meter switch to the forward power position on both the exciter and the amplifier.
Slowly advance the power on the exciter until RF power output is observed on both meters.
Check now for VSWR. If the standing wave reading appears normal (less than 1.5:1) then
proceed to raise the power. The voltage on the amplifier should remain steady at approximately
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