STATION MONITOR - A39865
Thes A39865 was used as monitoring equipment for broadcasting stations. It provided continuous visual indication of the percentage modulation of the transmitter carrier and checked the frequency of the emitted wave by means independent from the transmitter
Frequency accuracy was plus or minus 50 cycles.
This unit has a carefully calibrated, temperature controlled, quartz crystal oscillator, operating at a very low power level. The output is then fed to circuits which produce a beat note between the oscillator and the transmitted carrier.
FREQUENCY DEVIATION METER
A galvanometer was used to indicate the deviation of the transmitter carrier frequency from that of the requency standard oscillator within plus or minus 100 cycles. ThIs meter is so. calibrated that when the station transmitter is exactly on it's assigned frequency, the reading is zero, Any
deviation in in the transmitted frequency will produce a note which will be registered on the meter as "cycles high" or "cycles low".
|Image provided by Lewis Bodkin|
Contributors and Credits:
1) Lewis Bodkin <05bodkin555(at)gmail,com>
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