AR 1000S1G6C, Operating And Service Manual

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Rev A 7
2. OPERATING INSTRUCTIONS
2.1 GENERAL
Operation of the Model 1000S1G6C broadband amplifier is quite simple. The amplifier’s input signal, whether
swept or fixed in frequency, is fed into the jack marked RF INPUT, and the amplifier’s output signal is taken
from the jack labeled RF OUTPUT . The unit is turned on by activating the front panel POWER switch. In
the event of a major malfunction, protection is provided by a circuit breaker located on the unit’s rear panel.
CAUTION:
The Model 1000S1G6C Amplifier will provide 100% of rated power
without foldback up to 3.0:1. Mismatch above 3:1 may limit output to 250
watts reflected power. The amplifier will operate without damage or
oscillation with any magnitude and phase of source and load impedance.
However, placing the amplifier in the Operate mode without a load
connected to the output connector is not recommended. It has also been
designed to withstand, without damage, RF input power levels up to
twenty (20) times its rated input of 1mW. However, signal levels higher
than 20mW or transients with high peak voltages can damage the
amplifier. Also, accidental connection of the Model 1000S1G6C output to
its input (either through direct connection or parasitic feedback paths)
will cause oscillations that may permanently damage the unit’s input
transistors.
The 1000S1G6C amplifier is protected from input overdrive by an automatic level control circuit. The
1000S1G6C RF power transistors are protected from over temperature by sensing the chassis temperature near
the RF output transistors. In the event of a cooling fan failure or an airflow blockage, the DC voltage will be
removed from the RF stages, when the chassis temperature reaches approximately 70°C.
Normal operation can be resumed after the chassis temperature drops below 70° C.