What about measuring with kalibrate-uhd? https://github.com/cryptik/kalibrate-uhd
On Mon, 24 Jul 2017 at 13:11 Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > The best method for measuring a fundamental parameter like frequency drift > would be to use a signal source of known (and much-superior) stability, and > use something like uhd_fft with the B210 to observe drift over time (use > the peak-hold feature in the FFT display). > > The problem with using the end-application is that it is very very > difficult to "de-embed" the behaviors of the end application from the > parameter you're trying to measure. > > > > > > > > > On 2017-07-24 10:28, Marcus Müller via USRP-users wrote: > > Dear John, > > at this point my recommendation is: Describe your measurement setup in > more detail, and verify it's useful for measuring the clock quality of the > B210, and not the of your CC11xx system. In fact, from what you've > described, I can't really say I understand how this measures the clock > offset of the B210 – instead, it only measures how well the CC11xx works > together with your software; I'm having a bit of a hard time seeing how you > can derive statements on the frequency shift from that. > > Best regards, > Marcus > > On 07/24/2017 11:35 AM, john liu via USRP-users wrote: > > HI,all, > Do you have any suggestions about this? > thank you. > best regards > John > > On Mon, Jul 24, 2017 at 9:15 AM, 戚科峰(研三 福州) <qikef...@ruijie.com.cn> > wrote: > >> Hi,Marcus, >> >> >> >> we use The B210 as a basestation and cc1120 as the tranceiver of UE. >> >> The B210 uses the Frequency offset estimation algorithm to estimate the >> frequency offset of cc1120 and records it. >> >> there are several UE in the system,UE will receive the B210'signal >> periodically and will send a signal to B210 in another period. >> >> when the phenomenon of the 3.2k frequency shift occured， all UE could >> not receive the signal of B210.when time for UE to send a signal， >> >> B210 would estimate the new frequency shift and found that the Frequency >> offset of every UE shifts 3.2k。So we think the shifting occured in B210 >> instead of UE。 >> >> >> >> best regards >> >> >> >> >> >> *发件人:* john liu [mailto:johncorad1...@gmail.com] >> *发送时间:* 2017年7月21日 16:42 >> *收件人:* Marcus D. Leech >> *抄送:* USRP-users@lists.ettus.com; 戚科峰(研三 福州) >> *主题:* Re: frequency shift of B210 >> >> >> >> Hi,Marcus, >> >> We calculated this. >> >> The B210 not only generate a GFSK signal,but also received the signal >> from CC1120.The CC1120 and B210 both work in full duplex mode. >> >> Hi qi, >> >> Can you describe your test method?I am not clear for that. >> >> >> >> best regards >> >> John >> >> >> >> >> >> On Fri, Jul 21, 2017 at 10:47 AM, Marcus D. Leech <mle...@ripnet.com> >> wrote: >> >> On 07/20/2017 10:08 PM, john liu wrote: >> >> i am sorry. >> >> We generate a GFSK signal with B210 and received the signal with >> multiple cc1120.When frequency shift occurred,the cc1120 can not received >> the signal. >> >> Also, another b210 has been running for several days without such a jump >> phenomenon. >> >> So, sorry to be a bother, but, where did the 3.2kHz frequency shift >> measurement come from? The CC1120 is just a GFSK demodulating digital >> receiver. >> >> >> >> >> >> On Fri, Jul 21, 2017 at 9:37 AM, Marcus D. Leech <mle...@ripnet.com> >> wrote: >> >> No i mean what were you measuring? >> >> >> >> Were you using an external signal generator and what were its specs? >> >> >> >> >> Sent from my iPhone >> >> >> On Jul 20, 2017, at 9:09 PM, john liu <johncorad1...@gmail.com> wrote: >> >> HI Marcus, >> >> internal with TCXO. >> >> >> >> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mle...@ripnet.com> >> wrote: >> >> On 07/20/2017 02:22 AM, john liu wrote: >> >> >> >> What was your tuned frequency in this case? >> >> >> >> Hi,Marcus, >> >> >> >> It is 433.05Mhz >> >> That's about 7PPM. >> >> What was your signal source? >> >> >> >> >> >> On Thu, Jul 20, 2017 at 11:46 AM, john liu <johncorad1...@gmail.com> >> wrote: >> >> Hi all, >> >> We used B210 with TCXO,and run about 2 hours , a 3.2K frequency shift >> occurred when the temperature did not change significantly.Is it a normal? >> >> How can we improve this situation? >> >> >> >> thank you. >> >> best regards >> >> John >> >> >> >> >> >> >> >> >> >> >> >> >> > > > _______________________________________________ > USRP-users mailing > listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Marco Casaroli
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