So how does a frequency lock work? How is it implemented? Can someone sketch a schematic?
And what equipment or technique is used to measure a 2hz error at 100GHz? Bob >>> -----Original Message----- >>> From: time-nuts [mailto:[email protected]] On Behalf Of Tim >>> Shoppa >>> Sent: Wednesday, August 26, 2015 5:18 PM >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] Chinese GPSDO 10 MHz error >>> >>> Full KE5FX evaluation of BG7TBL GPSDO here: >>> http://www.ke5fx.com/gpscomp.htm >>> >>> I'm wondering out loud if it might, like many hobbyist GPSDO's, be >>> frequency-locked rather than phase-locked and thus susceptible to >>> last-digit- >>> counter bobble in some long-averaging counter. >>> >>> Tim N3QE >>> >>> On Wed, Aug 26, 2015 at 3:18 PM, Perry Sandeen via time-nuts < time- >>> [email protected]> wrote: >>> >>> > Hi, >>> > >>> > >>> > >>> > On the EEVBLOG (http://www.eevblog.com/forum/index.php) >>> > >>> > >>> > >>> > They mention that the "2014-11-06"version GPSDO that was “most >>> > extensively tested, so far (by ke5x and others). >>> > >>> > >>> > >>> > (Has a) known bug, outputfrequency is not exactly 10mhz >>> > (9,999,999.999,800 Hz). This translates to ~2hzerror at 100ghz.” >>> > >>> > >>> > >>> > A question is if this bug isjust for this particular model or all >>> > other versions suspect? >>> > >>> > >>> > >>> > I realize that in and of itsself it is very small error, but errors >>> > tend to multiply or cause incorrectconclusions to testing. >>> > >>> > >>> > >>> > Another question is will the LHdisplay unit they offer work with other >>> > Trimble units such as are offered byRDR? >>> > >>> > >>> > >>> > That said, these models seem tobe a very nice turn-key systems. >>> > >>> > >>> > >>> > Regards, >>> > >>> > >>> > >>> > Perrier >>> > >>> > _______________________________________________ >>> > 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.
