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 > > > > > > > > > > > > >
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