HI,Derek, I am sorry,something wrong with my mail which can not received the replay. I found the answer on user list. thank you. best regards John
On Wed, Jul 26, 2017 at 10:03 PM, Derek Kozel <derek.ko...@ettus.com> wrote: > Hi Jong, > > Marcus Leech and Marco have both offered good advice on testing the > frequency stability of the B210 against outside references. Have you tried > either? > > Marcus Muller also asked for additional information about your test setup. > > Regards, > Derek > > On Wed, Jul 26, 2017 at 2:04 AM, john liu via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi all, >> Any suggestions is welcome. >> >> best regards >> Jong >> >> On Mon, Jul 24, 2017 at 5:35 PM, john liu <johncorad1...@gmail.com> >> 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 list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >
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