AR 100A400AM20, Operating And Service Manual

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Rev A 9
2. OPERATING INSTRUCTIONS
2.1 GENERAL
Operation of the Model 100A400AM20 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 100A400AM20 Amplifier is typically not critical in regard to
source and load Voltage Standing Wave Ratio (VSWR) and will remain
unconditionally stable with any magnitude and phase of source and load
VSWR.
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 100A400AM20’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 100A400AM20 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 AMPLIFIER FRONT AND REAR PANELS
Figure 2-1 shows the front panel of the Model 100A400AM20 Broadband Microwave Amplifier. Figure 2-2
shows the rear panel of the Model 100A400AM20 Broadband Microwave Amplifier.
Figure 2-1. Model 100A400AM20 Front Panel