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Clandestine receiver
This miniature valve-based receiver was designed in 1954 by SG Hart (VK5HA)
when working for the HMGCC at Borehamwood (UK). It was intended as a replacement
for the war-time MCR-1 and was built around 5 subminiature
valves.
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The Mk.301 is a superheterodyne receiver, suitable for the reception of AM
and CW signals, housed in a very small metal case, of which one corner
section was missing.
The missing section was filled by a coil pack that could be inserted in four
different orientations, thereby effectively replacing the four individual
coil units of the MCR-1.
The complete radio came packed in a small carton, together with an
accessory box of the same size and an instruction booklet.
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After opening the box, a brown envelope containg a checklist and the
instruction booklet was reveiled. The circuit diagram was part of
the instruction booklet. Next, two grey painted metal boxes of identical size
were discovered. One was the actual receiver, with the coil pack plugged in.
The other one was the accessory box.
The lid of the accessory box can easily be removed with, say, a coin.
Inside it are the accessories, such as the wire antenna, the headphones,
power cable, etc. The lid holds a frequency translation
table on the inside. When the accessories were removed, the accessory box acted as a battery compartment for both voltages (1.5V LT and 67.5V HT).
The receiver was intended for several services that were controlled by
Hanslope park (UK), but it was later adopted for use by the Army's
Special Forces as well.
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Some Mk.301 units were supplied with a mains power supply unit (PSU).
When present, the Mk.301PP AC mains adapter would be placed inside the
accessory box and fitted exactly in the space that was normally used for
the batteries.
The PSU shown in the image on the right is a good-looking replica that
was built to the original specifications and sizes.
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- Louis Meulstee, Wireless for the Warrior, volume 4
ISBN 0952063-36-0, September 2004
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© Copyright 2009-2011, Paul Reuvers & Marc Simons. Last changed: Tue,12 Apr 2011.22:37:36
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