BC 221 M Bundeswher

[rv12p2000]

Hello

Can you help :

I search some information and schematic diagram about the german rebuild for frequency meter/heterodyne BC 221 m bundeswehr version

The german improvement are a power supply and magic eye for the beat frequency control

The factory of this is in Munich

This version of this is long time ago on ebay http://ebays.com.ua/catalog/show/310315835807/

Regards
RV12P2000

[rv12p2000]

The name of this accessory is "Interpolation oscillator"
it 's use for measuring the audio frequency

[Val]

Could russian version help you?

http://www.wftw.nl/russian221.html

[rv12p2000]

Hello Val

Thanks I knew this Russian copy and there was also a French version : http://www.radiomuseum.org/r/ame_fre..._tr_tx_1c.html or http://retro-forum.com/viewtopic.php...20531&start=15

The Bundeswehr had added a power supply and the magic eye to know exactly the audio beat frequency to know the high frequency frequency exactly

the french navy are used a similar technic based on Wien Bridge to know the beat frequency

The former process is known as the oscillator of interpolation for example: general radio 617 c : http://www.mcmlv.org/Archive/TestEqu...adio_617-C.pdf


Regards

RV12P2000