[time-nuts] Locking gunn diode

[Normand Martel]

>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 at 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 at febo.com
> [mailto:time-nuts-bounces at 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.
> >
> 
> 
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