Hi The simple answer to the question is that over a reasonably long time period, the GPSDO is right. (assuming it’s a good GPSDO) How long “reasonably long” is depends a bit on various issues. Measure change on 1 pps outputs over a 24 hour period and you are likely well past any of the issues you are likely to run into. Bob > On Oct 17, 2024, at 1:31 PM, kevin.mortimerhampson via time-nuts <time-nuts@lists.febo.com> wrote: > > Hi,Many thanks for posting this. I did not get the same helpful response from Accubeat when I emailed them.I have an AR-40A which is fully operational, but the cal sticker is well out of date. I have compared it with the output of my BG7TBL GPSDO and the phase drift is incredibly slow, so I have resisted trying to align the two as who is to say which is right?Cheers,Kevin M-HSent from my Galaxy S6 Tablet > -------- Original message --------From: Russell Moore via time-nuts <time-nuts@lists.febo.com> Date: 17/10/2024 1:44 pm (GMT+00:00) To: time-nuts@lists.febo.com Cc: Russell Moore <rgmoore@gmail.com> Subject: [time-nuts] Manual for Accubeat AR-40A I contacted Accubeat for information on an AR-40A I picked up. They wereextremely helpful and sent me the attached manual. I hope others may findit as useful as I have. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com