> 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 _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
