AR 1000W1000G, Operating And Service Manual, Page: 29 / 70

Rev A 9
2. OPERATING INSTRUCTIONS
2.1 GENERAL
Operation of the Model 1000W1000G 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 1000W1000G Amplifier
will provide 100% of rated power
without foldback into a mismatched load. 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 1000W1000G’s 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 1000W1000G Amplifier is protected from input overdrive by an automatic level control circuit. The
1000W1000G 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.
2.2 CONTROL AND INDICATOR FUNCTIONS
The Model 1000W1000G’s front panel is shown in Figure 2-1; the unit’s rear panel features are detailed in
Figure 2-2.
2.2.1 Keylock Switch
The Keylock Switch is provided for protection from unauthorized use or unexpected remote control of the
amplifier. The amplifier can only be turned on locally when the Keylock Switch is in the LOCAL position.
Likewise, the unit can only be turned on or controlled remotely when the Keylock Switch is in the
REMOTE
position. Placing the Keylock Switch in the INHIBIT position places the amplifier in the RF Off mode and
prohibits any control of the amplifier.