I was under the impression it was a relatively low phase noise design... In any case, my 10MHz crystals are parallel-resonant. Are there any alternative oscillator designs you'd suggest I look into?
Thanks, Phil. On 24/04/14 02:38, Bob Camp wrote: > HI > > The circuit they show is not very low phase noise, so adding stuff is not > going to degrade it much. It will lower Q, but again, it’s not really Q > limited over most of the range. > > The real issue with the circuit is that it has lousy load isolation. > > Bob > > On Apr 23, 2014, at 9:06 PM, Tom Knox <act...@hotmail.com> wrote: > >> Does adding these filter elements lower Q or affect Phase Noise? >> Thanks; >> >> Thomas Knox >> >> >> >>> From: li...@rtty.us >>> Date: Wed, 23 Apr 2014 17:47:26 -0400 >>> To: time-nuts@febo.com >>> Subject: Re: [time-nuts] Wenzel oscillator - L1 value? >>> >>> Hi >>> >>> Roughly (very roughly) speaking, the series combination of C1, C2, C3 and >>> L1 should equal the load capacitance of the crystal. If there is a varicap, >>> it’s likely in series as well. If the crystal is cut for series, then L1 >>> resonates with the caps in series. >>> >>> You can put it on a Spice program and get more accurate results. >>> >>> Bob >>> >>> On Apr 23, 2014, at 10:23 AM, li...@philpem.me.uk wrote: >>> >>>> Hi, >>>> I'm currently playing around with crystal oscillators (specifically a >>>> homebrew OCXO) and came across the Wenzel low-distortion crystal >>>> oscillator: >>>> http://www.wenzel.com/pdffiles1/pdfs/xtalosc.pdf >>>> >>>> This uses an inductor (L1) to trim the crystal frequency, with the note >>>> that a varactor/varicap could be added to allow the frequency to be >>>> trimmed electronically. >>>> >>>> Has anyone built one of these oscillators? >>>> >>>> How would you pick a value for L1? I've been reading up on other crystal >>>> oscillator types (Colpitts, Clapp,...) and have yet to find anything which >>>> uses this style of frequency trimming. >>>> >>>> Where would I add the varactor if I wanted to add EFC? Across C3? >>>> >>>> Thanks. >>>> -- >>>> Phil. >>>> phil...@philpem.me.uk >>>> http://www.philpem.me.uk/ >>>> _______________________________________________ >>>> 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. > -- Phil. li...@philpem.me.uk http://www.philpem.me.uk/ _______________________________________________ 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.
