12-18-06 Is it possible to lock a 10ghz gunn diode transceiver (supply voltage 10.00 vdc) to a 10 mhz standard? Signal applied to either gunn diode or varactor supply voltages. Rick

Rick, If you are talking about injection locking, that will probably not be practical. The Gunn is not stable enough (not the Gunn itself, but the cavity where it will be installed) to stay close enough to the right harmonic to stay locked, and the high order difference between the gunn and the injection signal makes it just about impossible. Even if you could lock it, you probably would have 10 MHz spurs (I am just guessing). Phase locking through a PLL system is possible of course, even though it will be relatively complicated, unless you find one of these synthesizer boards on eBay, designed for YIG oscillators, and modify it to drive a varactor. Didier KO4BB stork3264@comcast.net wrote: > 12-18-06 > > Is it possible to lock a 10ghz gunn diode transceiver (supply voltage 10.00 vdc) to a 10 mhz standard? Signal applied to either gunn diode or varactor supply voltages. > > Rick > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >

I agree that injection locking may not be ideal, but mainly because it's not that hard to do the job with an actual PLL. Here's an example of a quick-and-dirty Gunnplexer hack with an Analog Devices PLL chip and a Hittite prescaler: http://www.ke5fx.com/gunnpll.html . Close-in spectral purity was not great, but it would be fine for NBFM work. -- john, KE5FX > -----Original Message----- > From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On > Behalf Of Didier Juges > > If you are talking about injection locking, that will probably not be > practical. The Gunn is not stable enough (not the Gunn itself, but the > cavity where it will be installed) to stay close enough to the right > harmonic to stay locked, and the high order difference between the gunn > and the injection signal makes it just about impossible. Even if you > could lock it, you probably would have 10 MHz spurs (I am just guessing). > > Phase locking through a PLL system is possible of course, even though it > will be relatively complicated, unless you find one of these synthesizer > boards on eBay, designed for YIG oscillators, and modify it to drive a > varactor. >

>From the John's link, i found another interesting link: http://forms.analog.com/form_pages/rfcomms/adisimpll.asp adisimpll is a PLL design tool, especially useful in the loop filter design. 73 de Normand VE2UM Montreal, Qc. Canada --- John Miles <jmiles@pop.net> wrote: > I agree that injection locking may not be ideal, but > mainly because it's not > that hard to do the job with an actual PLL. Here's > an example of a > quick-and-dirty Gunnplexer hack with an Analog > Devices PLL chip and a > Hittite prescaler: http://www.ke5fx.com/gunnpll.html > . Close-in spectral > purity was not great, but it would be fine for NBFM > work. > > -- john, KE5FX > > > -----Original Message----- > > From: time-nuts-bounces@febo.com > [mailto:time-nuts-bounces@febo.com]On > > Behalf Of Didier Juges > > > > If you are talking about injection locking, that > will probably not be > > practical. The Gunn is not stable enough (not the > Gunn itself, but the > > cavity where it will be installed) to stay close > enough to the right > > harmonic to stay locked, and the high order > difference between the gunn > > and the injection signal makes it just about > impossible. Even if you > > could lock it, you probably would have 10 MHz > spurs (I am just guessing). > > > > Phase locking through a PLL system is possible of > course, even though it > > will be relatively complicated, unless you find > one of these synthesizer > > boards on eBay, designed for YIG oscillators, and > modify it to drive a > > varactor. > > > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com