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
