Hi What are you going to use the 25 MHz for? Will it drive any sort of radio? If so, cleaning up the phase noise of the GPSDO is a *very* good idea. With a PLL, you can *subtract* noise. With a multiplier you can only *add* noise. The narrow bandwidth PLL combined with a low nose VCXO is your friend in this case.
I would take the process one step further. I’d lock up a 100 MHz VCXO to the 10 MHz. Then you can get 100, 50, 25, and 20 MHz outputs. The 100 MHz is the key if you want to head up into the microwave region. Bob > On Jan 18, 2017, at 8:40 PM, Loren Moline WA7SKT <lmol...@hotmail.com> wrote: > > Are you talking about locking the 50MHz VCXO to my 10 MH. Standard? I want > the 25MHz to be from my 10MHz OCXO which is my station standard which will > locked to GPS eventually. > > Loren WA7SKT > > > > > On Wed, Jan 18, 2017 at 4:01 PM -0800, "Richard (Rick) Karlquist" > <rich...@karlquist.com<mailto:rich...@karlquist.com>> wrote: > > > A better and easier way is to phase lock a crystal oscillator. > I would use a 50 MHz VCXO and divide the output by 2 to get a > 25 MHz square wave. > > Rick N6RK > > On 1/18/2017 10:28 AM, Loren Moline WA7SKT wrote: >> Hello, >> >> I am looking for a good X5 multiplier to use to generate a 25MHz signal from >> my 10MHz OCXO. I want to divide by 2 and multiply by 5 with a bandpass >> filter in the output and then a 3.3 volt 25MHz signal out. >> >> >> Maybe someone has better ways? >> >> >> Loren Moline WA7SKT >> >> Member: Pacific Northwest VHF Society and ARRL >> Member: Hearsat Satellite Monitoring Group. www.uhf-satcom.com >> Member: CVARS-Chehalis Valley Amateur Radio Society >> Starchat IRC: Channel = #hearsat >> RF Electronics: Starchat IRC: Channel = #rfelectronics >> Grid: CN86mr >> _______________________________________________ >> 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. > > _______________________________________________ > 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.
