Hi Ok, if that still turns out to be correct … that’s just about 2 ppb. ( 1.6667…). To do that with the C field, you would need to make a *major* change. It’s essentially the whole range of the pot. You already know that it’s off in the direction of needing more counts on the dial. I *think* the current is lowest at that end, but I could easily be wrong. Either you need zero current or 2X normal. Either way that should be easy to spot.
Bob > On Dec 2, 2020, at 2:59 PM, paul swed <paulsw...@gmail.com> wrote: > > Yes absolutely it can go back and it is the same offset. I can get real > numbers from memory 3 seconds for 5ns drift and the units slow. Will > confirm and reshare. > Regards > Paul. > > > On Wed, Dec 2, 2020 at 2:52 PM Bob kb8tq <kb...@n1k.org> wrote: > >> Hi >> >> Just double checking….. Are we still after a change went past 1/3 of the >> pot range? >> >> Can we get the pot back to the original location and measure the frequency >> offset >> (even if only in a crude fashion)? >> >> Best guess is still that this should be a ppb or more of shift. If it’s >> down in the >> 4x10^-11 range then indeed, there’s something off in the C Field setup. >> >> Bob >> >>> On Dec 2, 2020, at 2:03 PM, paul swed <paulsw...@gmail.com> wrote: >>> >>> Corby will check. Though in looking at the cfield circuits it does appear >>> all to be correct. Its some other odd offset that has crept in. >>> Thanks >>> >>> On Wed, Dec 2, 2020 at 1:56 PM <cdel...@juno.com> wrote: >>> >>>> Paul, >>>> >>>> One other thing to check. >>>> >>>> Put a DC coupled scope on the C-field pot wiper and rotate the pot back >>>> and forth. >>>> >>>> Make sure there are no jumps or noise. >>>> >>>> Sometimes the pot gets noisy in a section. >>>> >>>> Rotating it back and forth across the bad sections will usually clean it >>>> up. >>>> >>>> Cheers, >>>> >>>> Corby >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
