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BN-22/1
DC power supply unit - this page is a stub

BN-22/1 was a solid-state DC power supply unit (PSU), developed in the early 1960s by Pfitzner in Germany, for use in combination with the BN-22 (FS-7) clandestine transmitter. It allows the transmitter to be powered from a 12V DC voltage, such as the battery of a car. Together with the BN-22 transmitter and the BN-22/2 AC mains PSU, the device is part of the SP-15 spy radio set.

The device is housed in a grey hammerite 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 are two banana sockets for connection the external battery. At the front panel are a small voltage meter and a lever to select the desired transmitter power output. It allows selection between full or half power. 		  
DC power supply

DC power supply
DC power supply
Front panel
Transmitter output power selector
Connector
A
×
A
1 / 5
DC power supply
A
2 / 5
DC power supply
A
3 / 5
Front panel
A
4 / 5
Transmitter output power selector
A
5 / 5
Connector
❮ ❯

Interior
Interior
Power inverter circuit
Battery input and relay
B
×
B
1 / 3
Interior
B
2 / 3
Power inverter circuit
B
3 / 3
Battery input and relay
❮ ❯

Documentation
  1. Power inverter for FSS-7, circuit diagram 1
    Date unknown.

  2. Circuit diagram as printed inside the bottom lid 1
    Date unknown.
  1. Document kindly provided by Jim Meyer [1]

References
  1. Helmut 'Jim' Meyer, HS0ZHK, My way to Ham - Radio and beyond
    Website QRZ.COM. Personal correspondence. Retrieved April 2013.
Further information
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© Crypto Museum. Created: Sunday 20 January 2019. Last changed: Sunday, 20 January 2019 - 17:48 CET.
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