You can never be absolutely sure of your frequency, no matter how you measure it. That is the Holy Grail that the folks on this list pursue but can never attain.
Since the GPSDO I built (actually two of them) uses the GPS satellite system for frequency control, I feel it's as good as you can get in this price range. One experiment I tried to confirm that they actually worked was: One GPSDO 10 MHz output was used as the external reference for an EIP 535 Counter. The second GPSDO was used to lock up a 1 GHz PLO brick set to 970.000 MHz. Reading the output of the 970 MHz brick on the EIP counter produced a reading of 970 000 000. The last zero did fluctuate +/- 1 digit randomly. If I can resolve 1 Hz at 970 MHz, that's good enough for me and my uses for it. Can anyone do better for $100 ?? 73, Dick, W1KSZ -----Original Message----- >From: Attila Kinali <[EMAIL PROTECTED]> >Sent: Apr 20, 2008 5:50 AM >To: "Richard W. Solomon" <[EMAIL PROTECTED]>, Discussion of precise time and >frequency measurement <[email protected]> >Cc: Discussion of precise time and frequency measurement <[email protected]> >Subject: Re: [time-nuts] Frequency reference > >On Thu, 17 Apr 2008 08:47:48 -0700 (GMT-07:00) >"Richard W. Solomon" <[EMAIL PROTECTED]> wrote: > >> You can build a very good GPSDO for about $100 in parts. > >Stupid question, but if one builds his on frequency >reference, how can you be sure it's acurate and precise? > >Or to but it in other words: how do you measure self build >devices? > > Attila Kinali > >-- >The true CS students do not need to know how to program. >They learn how to abstract the process of programming to >the point of making programmers obsolete. > -- Jabber in #holo _______________________________________________ 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.
