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Need RF oscillator, phase modulation capable

Discussion in 'Electronic Design' started by George, Jan 30, 2013.

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  1. George

    George Guest

    Can someone suggest where I should look for a used tunable RF oscillator around 1 MHz that can be phase modulated from an external input?
     
  2. brent

    brent Guest

    Depending on what you are doing a Direct Digital Synthesizer might be
    a good way to do what you are trying to do. Another thought is to use
    quadrature modulation on a fixed 1MHz source.

    If you are looking for a 1 MHz VCO with a frequency adjust, it may be
    tough to translate that to phase modulation. I suppose you could
    build some kind of PLL.

    I think we need more info to give better advice.
     
  3. Nico Coesel

    Nico Coesel Guest

    A Rhode & Schwarz SMDA should do that. I recently sold mine for about
    $100
     
  4. o pere o

    o pere o Guest

    Simplest approach -which may or not satisfy your unstated requirements:

    If you just want some discrete phases (e.g 4, as in QPSK), you could
    start with on oscillator at 4 times the frequency and digitally generate
    the 4 phases. Then, choose the one you like and, if required, try to
    filter out harmonics.

    Pere
     
  5. If a square wave is OK, you could use the VCO from a 4046 type part.

    George H.
     
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