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Vackar VFO Design Help

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New Member

I need help in understanding Vackar VFO. I searched on google, but all I found was some circuits with no listed formulas. Wikipedia article is a joke. I hear that Vackar VFO is the most stable discrete oscillator. If anyone know anything about it, please share.

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New Member
Since the Vackář is a variant of the Colpitts oscillator, you should be able to begin with the same formulas. Keep the same general range of reactance, and similar capacitance ratios and you have a good starting point.


Active Member
Take a look in amateur radio publications, particularly ARRL Handbooks. July 1997 QEX magazine may include an article on that design.
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