After I had designed the RF generator (N&V June 2014), I started to toy with the idea of adding a sweep function to it. The circuitry is quite economical to build, and draws its power through a short cable that plugs into a connector at the rear of the RF generator. Although this unit was created for use on my original generator design, the basic architecture can be modified for use with commercial RF generators that are based on varactor diode tuning.
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