Re: [time-nuts] OCXO inside the FEI AN/URQ-23
I have measured the Phase noise: freq dBc/Hz 1Hz -115 10Hz-135 100Hz -148 1kHz-160 10kHz -167 100kHz-171 Luciano www.timeok.it Da "time-nuts" time-nuts-boun...@febo.com A time-nuts@febo.com Cc Data Tue, 25 Jul 2017 10:48:24 -0400 Oggetto [time-nuts] OCXO inside the FEI AN/URQ-23 Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual looks promising. Question if it is frequency or ADEV Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OCXO inside the FEI AN/URQ-23
Bert wrote: Has any one run tests of the OCXO inside the AN/URQ-23. I've played with several of the pulled oscillators. They're nothing special -- xDEV at most frequencies for the ones I've seen is around 5-20x worse than an HP 10811. I tested them after they had been running for 2-3 weeks -- I've never taken the time to let one settle for months or years -- so some long-term improvement may be possible. But I doubt that the ones I've seen would ever equal a 10811. Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OCXO inside the FEI AN/URQ-23
> In my opinion ADEV does hide changes in Frequency and we see it when > we compare ADEV plots with at the same time frequency measurements. On purpose ADEV reduces hundreds, even hundreds of thousands of measurements to a single number. If this is what you mean by "hide" then ok. In my opinion, ADEV does not hide changes in frequency; it statistically summarizes them in a standard way. In general one should always look at phase residual or relative frequency strip charts before using ADEV. Another trick is using Stable32's DAVAR or TimeLab's multi-trace feature, both of which will expose variations in ADEV across a large data set. Or use histograms, etc. However, as you seem to imply, if you are seeing unexpected differences between frequency measurements and time (phase) measurements or between freq / time and ADEV statistics, then your measurement system(s) are broken. With only a single DUT, if different "at the same time" measurement systems report different results, then that's a smoking gun to find which measurement system(s) is failing you. > The URQ shows frequency specs 2E-12 most likely ADEV. See Table II on Page 9 of the manual [1]. /tvb [1] http://mil-spec.tpub.com/MIL-T/MIL-T-28816/MIL-T-288169.htm Original message From: Tom Van Baak <t...@leapsecond.com> Date: 7/25/17 11:37 AM (GMT-05:00) To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] OCXO inside the FEI AN/URQ-23 Bert, In the early days of time-nuts the URQ-10, and especially the URQ-23, were highly sought after because of their reported stability. By now they are quite rare. Do you have one? If it's important I can dig one out from the closet and run tests for you. > "Question if it is frequency or ADEV". I'm not sure what you mean. There is no such thing as "frequency" vs. "ADEV". /tvb - Original Message - From: "Bert Kehren via time-nuts" <time-nuts@febo.com> To: <time-nuts@febo.com> Sent: Tuesday, July 25, 2017 7:48 AM Subject: [time-nuts] OCXO inside the FEI AN/URQ-23 > Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual > looks promising. Question if it is frequency or ADEV > Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OCXO inside the FEI AN/URQ-23
Thanks I have 2. Will run some tests. In my opinion ADEV does hide changes in Frequency and we see it when we compare ADEV plots with at the same time frequency measurements. We see it with your plots on the Tbolt. The URQ shows frequency specs 2E-12 most likely ADEVBert Sent from my Galaxy Tab® A Original message From: Tom Van Baak <t...@leapsecond.com> Date: 7/25/17 11:37 AM (GMT-05:00) To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] OCXO inside the FEI AN/URQ-23 Bert, In the early days of time-nuts the URQ-10, and especially the URQ-23, were highly sought after because of their reported stability. By now they are quite rare. Do you have one? If it's important I can dig one out from the closet and run tests for you. > "Question if it is frequency or ADEV". I'm not sure what you mean. There is no such thing as "frequency" vs. "ADEV". /tvb - Original Message - From: "Bert Kehren via time-nuts" <time-nuts@febo.com> To: <time-nuts@febo.com> Sent: Tuesday, July 25, 2017 7:48 AM Subject: [time-nuts] OCXO inside the FEI AN/URQ-23 > Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual > looks promising. Question if it is frequency or ADEV > Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OCXO inside the FEI AN/URQ-23
Hello to the group. I think I have a beta AN URQ-23. Flea market special. Its oscillator never behaved correctly. (Most likely why it was at the Flea) I had no real details then and its a bit of a boat anchor. Its been a while and I think I hacked around in it without any real success. Regards Paul WB8TSL On Tue, Jul 25, 2017 at 11:37 AM, Tom Van Baak <t...@leapsecond.com> wrote: > Bert, > > In the early days of time-nuts the URQ-10, and especially the URQ-23, were > highly sought after because of their reported stability. By now they are > quite rare. Do you have one? > > If it's important I can dig one out from the closet and run tests for you. > > > "Question if it is frequency or ADEV". > > I'm not sure what you mean. There is no such thing as "frequency" vs. > "ADEV". > > /tvb > > - Original Message - > From: "Bert Kehren via time-nuts" <time-nuts@febo.com> > To: <time-nuts@febo.com> > Sent: Tuesday, July 25, 2017 7:48 AM > Subject: [time-nuts] OCXO inside the FEI AN/URQ-23 > > > > Has any one run tests of the OCXO inside the AN/URQ-23. Data in the > manual > > looks promising. Question if it is frequency or ADEV > > Bert Kehren > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OCXO inside the FEI AN/URQ-23
Bert, In the early days of time-nuts the URQ-10, and especially the URQ-23, were highly sought after because of their reported stability. By now they are quite rare. Do you have one? If it's important I can dig one out from the closet and run tests for you. > "Question if it is frequency or ADEV". I'm not sure what you mean. There is no such thing as "frequency" vs. "ADEV". /tvb - Original Message - From: "Bert Kehren via time-nuts" <time-nuts@febo.com> To: <time-nuts@febo.com> Sent: Tuesday, July 25, 2017 7:48 AM Subject: [time-nuts] OCXO inside the FEI AN/URQ-23 > Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual > looks promising. Question if it is frequency or ADEV > Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] OCXO inside the FEI AN/URQ-23
Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual looks promising. Question if it is frequency or ADEV Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
