Hi
> On Jul 30, 2020, at 7:56 AM, glen english LIST <glenl...@cortexrf.com.au> > wrote: > > Before I commit the soldering iron, can anyone share their sub-harmonic > injection locking experiences ? > > I have to make 393.216 from 49.152 . > Yes, lots of ways.... I know. > > injection locked at 1/8 of the frequency from the decent source. > > There wont be any issue of locking to the wrong harmonic, the VCO will be on > the money.I was thinking of using a dielectric loaded TEM resonator or TEM > coax line VCO . > > and why do this : ? > - I need all the non related spurs to be > 115dB down. A sub-harmonic injection locked oscillator can / does have spurs at the injection frequency and it’s multiples …… Bob > > - a double-double-double could work, but my experience is for x2 x2 x2 I > really need to filter well at each stage to avoid sum and difference > products.. which might be OK for this application , especially if I filter > really well after the first x2 . but avoid if I can. filters at 908 MHz need > space, and shield cans where it is going. > > - and I dont know too much about phase noise and SRD or varactor multipliers. > but maybe that's an option. > > - my attempts at generating low phase noise x6 with class C multipliers has > been dismal. > > - onboard VCO chip/PLLs have all sorts of unrelated spurs in the output. > > - sure I can use a good PLL and a external VCO, but if my N value is fixed, > and I can use injection locking, why bother with the PLL chip that is likely > to introduce PD related spurs anyway. > > regards > > glen > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
