This could be another way to achieve continuos tuning input:
http://www.wb8erj.com/813mainsch.htm
Best regards
Guillermo - LU8EYW.
Bob Kirkland escribió:
> Carl,
> Use a dual 350/400 ufd cap out of an old tube type bc set. Coil should
> be 1 and 1/2 to 2 inches in dia approx 60 turns. Center tap the coil.
> Connect one side of the coil to one stator on the cap, the other end
> of the coil goes to the other stator. The center tap hooks to the
> rotor. Don't mind my approx, this will get you in the ball park. Ck
> with a grid dipper, you won't believe it. I built one that tunes from
> 2 to Mhz. Intend to use it in a 8877 amp this Summer. Almost forgot
> both sides of the dual cap must be equal in ufd, Use a cap checker or
> a grid dipper with a 100 ufd cap. across one side at a time. Close
> the cap., and adjust the coil turns for equal low frequency or pull
> plates out of the cap if you have to.
> Bob,w5pvr
>
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