AR 10046494, Operating And Service Manual, Page: 25 / 60

Rev A 5
2. OPERATING INSTRUCTIONS
2.1 GENERAL
Operation of the Model 60/40S1G18B broadband amplifier is simple. The input signal, whether swept or
fixed in frequency, is fed into the jack marked INPUT and the amplifier output signal is taken from the jack
labeled OUTPUT. The unit is turned ON by activating the power switch. In the event of a unit malfunction,
protection is provided by a circuit breaker located in the AC input receptacle. A polarized, three (3) wire AC
power cord is also included with the unit to provide cabinet and chassis grounding to the power mains.
CAUTION:
The Model 60/40S1G18B amplifier is not critical in regard to source and
load VSWR and will remain unconditionally stable with any magnitude
and phase of source and load VSWR. It is designed to withstand, without
damage, RF input power 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
60/40S1G18B output to the input causes oscillations which will
permanently damage the input circuitry.
CAUTION:
Although designed for overdrive and load tolerance described above,
subjecting the amplifier to these conditions simultaneously can cause
failure of the output transistor. Repeated failures of this nature will not
be covered under warranty.
CAUTION:
AR does not recommend using the amplifier at any frequency below
0.7GHz as this may cause damage to RF devices due to an unbalanced
configuration.
The 60/40S1G18B 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.