The 38 set was a man-pack worn on the front in a canvas carrier with a
similar pouch housing the dry-cell batteries giving 90V HT and 1.5V for the
valve heaters. There is probably one dial with a locking clamp and very
restricted tuning range, possibly just 6MHz to 8MHz or 4MHz to 6MHz as I
recall. A single vane type knob is used for TX/RX.
The TX output is amplitude modulated to 30%. The standard headset was used
with a throat microphone.
The crystal calibrator did little more than provide a marker at 100KHz
increments but as I last used these in the early 60's as a school cadet,
memory is a bit thin. Even so as cast-offs from the military they were
soon superseded even for cadet use by the 88 set with 4 VHF crystal
controlled channels.
There is a vehicle adaptation known as the 38 set AFV and you would
recognise this as such if you saw it. They were very low powered making
only a few hundred milliwatts and in service a mile is about it, there is
some innovation however in that the 38 set was based around a very subtle
phase locked loop for both TX and RX using just 4 valves, one of these
being the ATP 4 (Army Transmitting Pentode), the others are ARP 8's ?
Incidentally, nothing wrong with a radio being called a
wireless............................
Richard [G3ZOE]
(Southampton UK)
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