Magnus, Indeed on my 5065a 8714 seems to be the right number. With the cfield I could trim to the gps just fine and hit the stability specification. By the table thats says I am -250 parts. OK, it works. But I would think I should be at 9999 or 0 offset by the table even though its not exactly zero. Second item is that if I adjust the lsd I would believe I should shift a bit. But it seems to have a much larger effect. As Corby said it doesn't actually matter. Just not making much sense though with your math maybe I need to run the numbers and see whats really going on. In that respect its much like the CS 5061standard.
I am curious that maybe back in 1974 atomic time was one thing and then a correction was done that makes it -250 from what it was. Maybe a historical adjustment. Regards Paul. On Sat, Oct 1, 2011 at 4:53 AM, Magnus Danielson <[email protected] > wrote: > On 30/09/11 17:46, [email protected] wrote: > >> Paul, >> >> The time scale selection is to match the offset in each particular >> receiver section and thus put it on frequency. Once there you can use the >> chart to determine offsets from the value you use. >> >> The synthesizer setting by virtue of how its designed does not allow one >> digit changes! You have to use one of the settings from the chart in the >> manual to get you within the C-field range when tuning! >> >> Also after a synthesizer change you have to wait a long time (or remove >> and replace the red wire powering the synthesizer) for the operation >> light to reset. >> > > I had one HP5065A with a totally non-standard setting. I put that setting > on paper and instead chose a standard one writen down on the front panel. > This gave me the wrong frequency, so I looked it up in the table of the > manual and tried a few others until I settled for one giving me good > frequency compared to by Thunderbolt locked to GPS. I the trimmed the > C-field up for the last piece. Once I decided to got this route, it didn't > take too much time to hit the spot. You are really lost without the table > with it's offset ordered sets of settings. > > There is a few hidden aspects to the synthesizer settings. The factor m and > n which reshape 5 MHz to 5,312.. MHz using m/n*5 MHz is not listed. The n > factor is n=10000-TW where as m is about 1.6 times n. The m factor > determines the loop gain in that PLL lock. However, it is only part of the > story, but it is interesting to note that there is a loop within a loop in > this rubidium where as the 5,312... MHz synthesis is done using other > methods in most other rubidiums. Dividing by 16 and mix up with 5 is not too > uncommon. > > Cheers, > Magnus > > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
