Does adding these filter elements lower Q or affect Phase Noise? Thanks; Thomas Knox
> From: [email protected] > Date: Wed, 23 Apr 2014 17:47:26 -0400 > To: [email protected] > 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, [email protected] 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. > > [email protected] > > http://www.philpem.me.uk/ > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
