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Adding a VFO to a Cobra 142


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.

73
 

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