OK, it sure sounds like you want to use a commercial signal generator or something. But a different take:
14.5MHz is a standard stocked crystal at Mouser, Digikey, etc. Three stages of doublers with simple fundamental-reject filters at each stage get you to 116 MHz. If you want to make it time-nutty, there's the NIST JFET "push-push" frequency doubler we've talked about here in the past. I think you'll use substantially smaller number of turns on the 116MHz stage than on the 14.5MHz end of the transformers. http://www.ko4bb.com/~bruce/FrequencyMultipliers.html Tim N3QE On Mon, May 30, 2016 at 7:06 AM, Dr. David Kirkby (Kirkby Microwave Ltd) < drkir...@kirkbymicrowave.co.uk> wrote: > I was thinking about designing a 2 m (144-146 MHz) ->HF (28-30 MHz) > transverter, using a 116 MHz local oscillator feeding a level 30 mixer. > > 116 + 28 = 144 > 116 + 30 = 146 > > I'm wondering what's the best way to generate 116 MHz with very low phase > noise. Phase noise at < 20 kHz offset is particularly important, but 200 > kHz would be fairly important. Outside that, it does not matter too much. > > The ability to lock to 10 MHz would be "nice", but certainly not essential, > as absolute frequency stability would not be of prime importance. Getting > the phase noise as low as possible would be more important. I expect better > performance can be achieved if one forgets about locking the signal source > to something else, but I may be wrong. > > An HP 8663A sig gen has <-147 dBc/Hz at 10 kHz offset, but I'd hope its > possible to produce something better than is possible in a commercial sig > gen that covers up to 2.5 GHz. > > Dave > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.