Re: [USRP-users] 答复: frequency shift of B210

2017-07-26 Thread john liu via USRP-users
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 wrote: > Hi Jong, > > Marcus Leech and Marco have both offered good advice on testing the > frequency s

Re: [USRP-users] 答复: frequency shift of B210

2017-07-26 Thread Ralph A. Schmid, dk5ras via USRP-users
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

Re: [USRP-users] 答复: frequency shift of B210

2017-07-26 Thread Derek Kozel via USRP-users
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

Re: [USRP-users] 答复: frequency shift of B210

2017-07-25 Thread john liu via USRP-users
Hi all, Any suggestions is welcome. best regards Jong On Mon, Jul 24, 2017 at 5:35 PM, john liu 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) > wrote: > >> Hi,Marcus, >> >> >> >> we use The B210 as

Re: [USRP-users] 答复: frequency shift of B210

2017-07-24 Thread Marco Casaroli via USRP-users
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 k

Re: [USRP-users] 答复: frequency shift of B210

2017-07-24 Thread Marcus D. Leech via USRP-users
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

Re: [USRP-users] 答复: frequency shift of B210

2017-07-24 Thread Marcus Müller via USRP-users
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 of

Re: [USRP-users] 答复: frequency shift of B210

2017-07-24 Thread john liu via USRP-users
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) 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 >