[USRP-users] 答复: frequency shift of B210

john liu johncorad1988 at gmail.com
Thu Jul 27 01:42:31 EDT 2017


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.kozel at 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 at lists.ettus.com> wrote:
>
>> Hi all,
>> Any suggestions is welcome.
>>
>> best regards
>> Jong
>>
>> On Mon, Jul 24, 2017 at 5:35 PM, john liu <johncorad1988 at 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) <qikefeng at 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:johncorad1988 at gmail.com]
>>>> *发送时间:* 2017年7月21日 16:42
>>>> *收件人:* Marcus D. Leech
>>>> *抄送:* USRP-users at 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 <mleech at 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 <mleech at 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 <johncorad1988 at gmail.com> wrote:
>>>>
>>>> HI Marcus,
>>>>
>>>> internal with  TCXO.
>>>>
>>>>
>>>>
>>>> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech at 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 <johncorad1988 at 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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>>
>
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