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Help! - circuit compared two RF freqs & triggers when same

Discussion in 'Radio and Wireless' started by gmcjetpilot, Mar 27, 2010.

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  1. gmcjetpilot

    gmcjetpilot

    13
    0
    Mar 27, 2010
    Help! - circuit compared two RF freqs & triggers when same

    The idea is compare a FIXED RF signal (any where from 455Khz to 12 Mhz at least, more range the better) with a sweeping Frequency (RF signal of fixed voltage). The idea is when they are the same, it triggers a pulse to the Z intensity input of the scope.

    I NEED HELP with the comparator and trigger. I have zero idea and hoping a few IC's will do it.

    [​IMG]
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Did you try to Google it? Here are some related results:
    http://www.freepatentsonline.com/6563346.html
    http://www.freepatentsonline.com/6642747.html
    http://www.freepatentsonline.com/6834093.html
    http://www.newcircuits.com/circuit.php?id=msr006
    Maybe the MC12040 can be used more or less directly?
    The comparator action is in principle an "ordinary" frequency demodulator, so a PLL or a quadrature demodulator might be used as the first part, then just a DC voltage window comparator.
    Beware of any delay in the comparator action causing a shift in the center indication, due to the sweep speed.
     
  3. gmcjetpilot

    gmcjetpilot

    13
    0
    Mar 27, 2010
    That is GOOD! Thanks George
     
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