Joe Joe Gwinn wrote: > Bruce, > > At 9:50 PM +0000 12/19/08, [email protected] wrote: > >> Message: 8 >> Date: Sat, 20 Dec 2008 10:50:46 +1300 >> From: Bruce Griffiths <[email protected]> >> Subject: Re: [time-nuts] Sub Pico Second Phase logger >> To: Discussion of precise time and frequency measurement >> <[email protected]> >> >> Joe >> >> Joe Gwinn wrote: >> >>> Bruce, >>> >>> At 3:54 AM +0000 12/19/08, [email protected] wrote: >>> >>> >>>> Message: 6 >>>> Date: Fri, 19 Dec 2008 16:54:12 +1300 >>>> From: Bruce Griffiths <[email protected]> >>>> Subject: Re: [time-nuts] Sub Pico Second Phase logger >>>> To: Discussion of precise time and frequency measurement >>>> >> >> <[email protected]> >> >> [snip] >> >> I'll breadboard an oscillator over the holidays and take some samples. >> >>>> >>>> >>> A rainy-day activity for sure. In the Boston area, the issue is >>> snow - a noreaster is just now starting, with a foot of snow expected. >>> >>> Joe >>> >>> >>> >> AFAIK it has never snowed here. >> > > So it instead rains heavily? > > > Yes, it does rain heavily from time to time but nothing like a monsoon. >> It does snow on the central NI Plateau but not usually in December. >> > > Well, I've just dug out of 1.5 feet of snow already, and it continues > to snow. The threat is that later we will get rain, and then it will > all freeze into solid ice. This in the Boston area. > > > >> I'll start with a diode limited (soft clamps - resistance in series with >> diodes) oscillator and move to a lower distortion one if necessary. >> > > What distortion level do we need? Given that the parts cost nothing, > I'd be tempted into some overkill. > At some stage we need to emulate the distortion level that is likely from the mixer output which could be as high as a few percent depending on the RF input level. Saturating the Mixer RF port as is usually recommended will increase the distortion.
May build a quadrature oscillator as this then allows testing with the 2 sound card channels either driven in quadrature or in phase. Can either use diode soft clamping or a photoresistor based AGC to control the output level. > Joe > > Bruce _______________________________________________ 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.
