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SBO RX Germany SP-15
AC power supply unit
BN-22/2 was a solid-state mains AC power supply unit (PSU),
developed in the early 1960s by H. Pfitzner in Germany,
for use in combination with the
BN-22 (FS-7) clandestine transmitter.
It allows the transmitter to be powered from any AC mains voltage between
95 and 235V, allowing it to be used virtually anywhere in the world.
Both devices were part of the SP-15 spy radio set.
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The device is housed in a grey hammer paint die-cast aluminium
enclosure, that has the same size as the
FS-7 transmitter.
At the right side is a black 8-pin connector that mates with the
8-pin socket at the left side of the transmitter.
At the left is the socket for connection to the local mains network.
The voltage selector at the front panel, should be set to the correct
voltage, before connecting it to the local mains network.
To the right of the voltage selector is a
two-position lever, that allows selection between full (transmission) power
and reduced (half) power.
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At the front left of the top surface, is a small meter that can be used
to check the mains voltage before connecting the transmitter. The needle should
point somewhere in the black area.
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The interior can be accessed from the bottom,
after removing the four screws at the corners and taking off the
bottom panel. This gives access to the highly compact interior,
as shown in the image on the right. At the left is the mains transformer,
which occupies nearly half the case.
The other half is taken by the printed circuit board (PCB) with the
stabilizer, and the voltage selector (at the front right).
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Document kindly provided by Jim Meyer [1].
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© Crypto Museum. Created: Sunday 20 January 2019. Last changed: Wednesday, 27 April 2022 - 13:24 CET.
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