[time-nuts] Passive Frequency Doubler (was Latest measurements on my FTS 4050/S24)
Christopher Hoover
ch at murgatroid.com
Sun Aug 20 20:21:56 EDT 2006
> A handy passive frequency doubler can be made just using a
> double-balanced mixer. Feed 5 MHz into the X and R ports
> connected together and take 10 MHz out of the L port. You'll
> loose a few db and the waveform becomes rather triangular but
> if your goal is to sync the internal oscillator in a counter
> to an external standard it works just fine. Mixers are often
> available on eBay for a very modest price.
>
> Regards, Brooks
Thanks for the suggestion. I've got a Mini-Circuits mixer in
my junk box somewhere; I'll give it a try.
The FTS 4050/S24 circuit is a Mini-Circuits half-wave doubler,
followed by a passive LPF and then cleanup by a discrete buffer.
Since I posted originally, I've wound a 1:4 transformer,
Roughly matched a pair of diodes and stuffed it all into a
Hammond box. It works OK. I haven't tried matching an
LPF yet.
-ch
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