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WWII NL OD Morse NSF OD Set →
The key was made by NSF especially for use in airplanes, and was available
in a number of variants: with a short or a long boom, with fixed wiring at
the bottom and with a protective cover.
The version used by the OD is slightly different. It does not have a
protective cover – the fixation bridge is missing – and its contacts are
brought out to three banana sockets at the rear.
The bare key has a
105 x 40 mm base and a 135 mm boom that pivots at 1/3rd from the rear.
It is bolted onto a 95 x 50 mm aluminium base plate,
which in turn is mounted on a wooden block.
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The wooden block measures 170 x 100 x 20 mm and is padded at the bottom with
a layer of 5 mm thick felt (185 x 120 mm).
The latter was done to reduce the acoustic
vibrations (i.e. the key clicks) when pushing down the morse key, which could
easily be heared through the walls of an appartment building.
As a general rule, not even the neighbours could be trusted at wartime [1].
The complete construction measures 200 x 120 x 80 mm, and weights 470 grams.
Of the three sockets at the rear, only the outer two contacts are wired, so that
the key can only be used as a normally open (n.o.) switch. The
normally closed (n.c.) contact is
bended out of the way, so that it
could not be used my mistake – it would have turned the transmitter
on when it was connected.
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The CJMV building – shown in the 1943 image on the right [5] –
was selected because of its strategic position.
The radio station was located in the attic, whilst the windows
at the top floor offered a good view of three surrounding
streets: Prinsegracht, the corner with Boekhorststraat and, opposite
the front door, Jan Hendrikstraat.
The building was also chosen because of the presence of electric
overhead lines of the tram. It was assumed that these lines would cause
interference when the Germans tried to locate the transmitter by means of
radio direction finding.
The transmitter was usually operated by wireless operators Adri van Mansum
(of Delft) and Joop Ketting (of The Hague), and occasionally also by
Dick Reijns, who had been appointed by wireless coordinator
Anton van Schendel
as the radio officer of OD Region 13
[3].
Reijns was a radio amateur (PA0RS) and had
a radio repair shop at Jan Hendrikstraat, close to the CJMV building.
He was responsible for the contact with London,
as well as for the contact with
other OD regions,
via the secret national OD communications network.
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Eindhoven was already liberated at this point.
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© Crypto Museum. Created: Tuesday 29 December 2020. Last changed: Thursday, 01 April 2021 - 10:09 CET.
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