SCR522 Airbourne Transceiver from WW2
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The SCR522 equipment comprises
a transmitter type BC624 and receiver type BC625 carried in a
metal case.
See the circuit diagram of the
complete installation (in two parts as it's very big)
PART 1 PART 2
It's designed for aircraft use
and operates on AM encompassing the aircraft band and covering
from 100 to 156 MHz.
The equipment is crystal controlled
and is mechanically tuned by an externally mounted relay module
which adjusts a set of variable capacitors whose settings were
preset prior to a particular mission.
The transmitter has four channels
and the receiver two channels.
Recently I was given a transmitter
unit which is pictured below. |
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Front view showing mechanical
selectors which control four tuned stages
From the pencilled markings
the transmitter might have been in the hands of a radio ham
This type of transmitter was
used on the 2 metre amateur band in the days when nearly all
VHF transmissions were crystal controlled.
One chose either a 6MHz or 8MHz
crystal which when multiplied developed a stable transmission
between 144 and 146MHz.
The rear view shows the input
circuit to the power amplifier valve, an 832 double tetrode which
could generate around 10 watts of power. |
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The third view shows the
output circuit |
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