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    #1

    BC 221 M Bundeswher

    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
    Tags: None
    #2
    The name of this accessory is "Interpolation oscillator"
    it 's use for measuring the audio frequency

    Comment

      #3
      Could russian version help you?

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

      Comment

        #4
        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
        Last edited by rv12p2000; 06-09-2016, 10:13 AM.

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