JL
john liu
Mon, Jul 24, 2017 9:35 AM
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@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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@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
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@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@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 <mleech@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@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@gmail.com> wrote:
>
> HI Marcus,
>
> internal with TCXO.
>
>
>
> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
>
>
>
>
>
>
>
>
>
>
>
>
>
MM
Marcus Müller
Mon, Jul 24, 2017 2:28 PM
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) <qikefeng@ruijie.com.cn
mailto:qikefeng@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@gmail.com
<mailto:johncorad1988@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
<mailto: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
<mleech@ripnet.com <mailto:mleech@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@ripnet.com <mailto:mleech@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@gmail.com
<mailto:johncorad1988@gmail.com>> wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech
<mleech@ripnet.com <mailto:mleech@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@gmail.com <mailto:johncorad1988@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
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) <qikefeng@ruijie.com.cn
> <mailto:qikefeng@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@gmail.com
> <mailto:johncorad1988@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
> <mailto: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
> <mleech@ripnet.com <mailto:mleech@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@ripnet.com <mailto:mleech@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@gmail.com
> <mailto:johncorad1988@gmail.com>> wrote:
>
> HI Marcus,
>
> internal with TCXO.
>
>
>
> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech
> <mleech@ripnet.com <mailto:mleech@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@gmail.com <mailto:johncorad1988@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
M
mleech@ripnet.com
Mon, Jul 24, 2017 4:09 PM
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) qikefeng@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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
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) <qikefeng@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@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 <mleech@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@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@gmail.com> wrote:
>
> HI Marcus,
>
> internal with TCXO.
>
> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
MC
Marco Casaroli
Mon, Jul 24, 2017 4:24 PM
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) qikefeng@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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@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
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) <qikefeng@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@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 <mleech@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@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@gmail.com> wrote:
>>
>> HI Marcus,
>>
>> internal with TCXO.
>>
>>
>>
>> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
JL
john liu
Wed, Jul 26, 2017 1:04 AM
Hi all,
Any suggestions is welcome.
best regards
Jong
On Mon, Jul 24, 2017 at 5:35 PM, john liu johncorad1988@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@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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@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
Hi all,
Any suggestions is welcome.
best regards
Jong
On Mon, Jul 24, 2017 at 5:35 PM, john liu <johncorad1988@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@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@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 <mleech@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@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@gmail.com> wrote:
>>
>> HI Marcus,
>>
>> internal with TCXO.
>>
>>
>>
>> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
DK
Derek Kozel
Wed, Jul 26, 2017 2:03 PM
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 johncorad1988@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@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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@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
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 <johncorad1988@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@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@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 <mleech@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@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@gmail.com> wrote:
>>>
>>> HI Marcus,
>>>
>>> internal with TCXO.
>>>
>>>
>>>
>>> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
>
>
RA
Ralph A. Schmid, dk5ras
Wed, Jul 26, 2017 2:22 PM
To add my experience, my B210 is off about 1 KHz in the 433 MHz bands. A bit above 2 ppm, probably still covered by the specs, but not the best value for a 6 GHz transceiver :) This was better in the beginning, but I don't know if this came from ageing, or from changes in UHD and FPGA image. It became obvious to me a few weeks ago, when I monitored a 5 GHz ham radio beacon that appeared off for more than 10 KHz.
I have still one question open, does the internal PLL of the B210 lock automatically when it gets a 10 MHz reference directly to the REF input, or does the PLL need to be initialized to start working? Means, when I circumvent the reference switch, not via the SMA input.
Ralph.
From: USRP-users [mailto:usrp-users-bounces@lists.ettus.com] On Behalf Of Derek Kozel via USRP-users
Sent: Wednesday, July 26, 2017 4:03 PM
To: john liu
Cc: 戚科峰(研三 福州); USRP-users@lists.ettus.com
Subject: Re: [USRP-users] 答复: frequency shift of B210
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 mailto: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 <johncorad1988@gmail.com mailto:johncorad1988@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@ruijie.com.cn mailto:qikefeng@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@gmail.com mailto:johncorad1988@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 mailto: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 <mleech@ripnet.com mailto:mleech@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@ripnet.com mailto:mleech@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@gmail.com mailto:johncorad1988@gmail.com > wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@ripnet.com mailto:mleech@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@gmail.com mailto:johncorad1988@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 mailto:USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
To add my experience, my B210 is off about 1 KHz in the 433 MHz bands. A bit above 2 ppm, probably still covered by the specs, but not the best value for a 6 GHz transceiver :) This was better in the beginning, but I don't know if this came from ageing, or from changes in UHD and FPGA image. It became obvious to me a few weeks ago, when I monitored a 5 GHz ham radio beacon that appeared off for more than 10 KHz.
I have still one question open, does the internal PLL of the B210 lock automatically when it gets a 10 MHz reference directly to the REF input, or does the PLL need to be initialized to start working? Means, when I circumvent the reference switch, not via the SMA input.
Ralph.
From: USRP-users [mailto:usrp-users-bounces@lists.ettus.com] On Behalf Of Derek Kozel via USRP-users
Sent: Wednesday, July 26, 2017 4:03 PM
To: john liu
Cc: 戚科峰(研三 福州); USRP-users@lists.ettus.com
Subject: Re: [USRP-users] 答复: frequency shift of B210
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 <mailto: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 <johncorad1988@gmail.com <mailto:johncorad1988@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@ruijie.com.cn <mailto:qikefeng@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@gmail.com <mailto:johncorad1988@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 <mailto: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 <mleech@ripnet.com <mailto:mleech@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@ripnet.com <mailto:mleech@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@gmail.com <mailto:johncorad1988@gmail.com> > wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@ripnet.com <mailto:mleech@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@gmail.com <mailto:johncorad1988@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 <mailto:USRP-users@lists.ettus.com>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
JL
john liu
Thu, Jul 27, 2017 5:42 AM
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@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 johncorad1988@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@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@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 mleech@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@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@gmail.com wrote:
HI Marcus,
internal with TCXO.
On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech mleech@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@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
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@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 <johncorad1988@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@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@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 <mleech@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@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@gmail.com> wrote:
>>>>
>>>> HI Marcus,
>>>>
>>>> internal with TCXO.
>>>>
>>>>
>>>>
>>>> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech@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@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
>>
>>
>
