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Adding a VFO to a Cobra 142

Discussion in 'CB Radio Modifications' started by Shadetree Mechanic, Dec 21, 2020.

  1. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

    Oct 23, 2017
    Likes Received:
    tecnicoloco and Dmans like this.
  2. nomadradio

    nomadradio Analog Retentive

    Apr 3, 2005
    Likes Received:
    Pretty much any CB with a PLL. The VCO in most such radios will prove to be a drifty VFO. Stability is not a big issue when the PLL circuit is 'tweaking' the tuning voltage ten thousand times a second, locking it to your 10.24 MHz crystal.

    But using the radio's Voltage-Controlled Oscillator as an open-loop VFO will reveal that it's not terribly stable.

    Cute idea, though.


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