); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Pete wrote: > Chris, > > The 3575A does NOT have adequate phase resolution to set an Rb > source to match a GPSDO. A few, now rather old, phase meters were > sold for this purpose, but they used a strip chart recorder to average > phase shift over 1 to 24 hour measurement times & required great > investments of time to use. > > I proposed a 1KHz heterodyne scheme for this very purpose on this > list a few months ago. The scheme took a few hits for lack of state- > of-the-art performance, but I'm still using it without suffering any > disappointments. It does require you to have a few items of test > equipment (readily available on eBay) which not everyone has & > it requires some circuit construction using readily available parts. > Except you must wind a couple of 5mH inductors on your own. > > Contact me off-list if you want more details. > > Regards, > Pete Rawson > > _______________________________________________ > Pete
Despite your claims the hits werent just for lack of state of the art performance. This circuit is an example of poor design practice and a lack of understanding of some of the fundamentals of electronic design. Just throwing something together without a good understanding of its operation and its limitations is never a recipe for reliable operation. You can also do much better with well designed circuit preferably with a lower beat frequency. It is also relatively easy to build a phase meter circuit with a resolution of around 1E-11/T or better using a few flipflops and a sigma delta ADC instead of a chart recorder. 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.
