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anTI°N GILA.RDI2iN
This FM- 20B is also equipped with a device which protects the
transmitter,
transmission line,
and antenna from abnormal load
conditions.
o
The unit consists of two sensitive d.c.
waplifiers whose input
signals are taken from the Micromatch coupler.
The voltages
from the coupler arc amplified and operate a pair of multi-
contact relays which operate the associated indicator lights
and alarm functions.
This unit can be set to operate under any pre- determined VSÁR
conditions.
This is done by adjusting the control Rll located
on the deck below the meter panel on the power cabinet.
The same procedure is then used in adjusting power control R10
to the desired level at which te relay RY1 operates.
The normally closed terinals of RY1 and RY2 are connected
in series and are included in the interlock circuits.
Therefore,
if any malfunction occurs because of improper trans-
mission line impedance or power,
the interlock circuit is opened.
The plate voltage on both the driver and amplifier is dropped.
The only way the transmitter can be operated is to clear the
responsible yaalfunction.
11/2/61
-1-
FM- 20B
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