On 08/16/2020 01:08 PM, Koyel Das (Vehere) wrote:
If you want I can send you the matlab code. You just have to capture
two channels of usrp better with grc and save those as .bin files.
Then you can run my matlab code. You just have to change the file
names in the code with the names that you give in your .bin files. You
should be getting same phase differences across frequency and channels
and the values are stored in one vector in the code that you can see
I don't use Matlab.
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*From:* USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of
Koyel Das (Vehere) via USRP-users <usrp-users@lists.ettus.com>
*Sent:* Sunday, August 16, 2020 10:16:54 PM
*To:* Marcus D. Leech <patchvonbr...@gmail.com>;
usrp-users@lists.ettus.com <usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
The measurement is not initial phase but the phase difference between
two channels
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*From:* Koyel Das (Vehere) <koyel....@vehere.com>
*Sent:* Sunday, August 16, 2020 10:15:48 PM
*To:* Marcus D. Leech <patchvonbr...@gmail.com>;
usrp-users@lists.ettus.com <usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
the phase difference between two channels of USRP as a function of
frequency and time, when measured by splitting the same signal and
feeding two channels of usrp, are wandering around wrt one another
which was not happening before. I had given demo more than 30 times
based on this principle and tested previously more than 50 times and I
got correct result every time. Now only suddenly it started happening.
The frequency is 2.4 GHz and bandwidth I tried from 1 MHz to 100 MHz.
Previously the whole bandwidth was showing similar values but then
suddenly started behaving abnormally giving near to correct result
sometimes and sometimes junk.
Regards,
Koyel
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
*Sent:* Sunday, August 16, 2020 10:05 PM
*To:* Koyel Das (Vehere); usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 11:59 PM, Koyel Das (Vehere) wrote:
No it doesn’t look better again after reducing gain. Sometimes the
phase differences are closeby but not so same as we were getting
before and most of the times they are totally incorrect. Strength of
the signal when we tried with maximum gain was near -40 dbm.
Regards,
Koyel
To clarify some things.
(A) The phase errors are just the initial phases--they don't wander
around with respect to one another during a run?
(B) What frequency range?
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*From:* USRP-users <usrp-users-boun...@lists.ettus.com>
<mailto:usrp-users-boun...@lists.ettus.com> on behalf of Marcus D.
Leech via USRP-users <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Sent:* Sunday, August 16, 2020 12:25:37 AM
*To:* usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>
<usrp-users@lists.ettus.com> <mailto:usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] Incorrect data from usrp 2955
On 08/15/2020 01:16 PM, Koyel Das (Vehere) via USRP-users wrote:
Hi,
We are using USRP 2955. Something has gone wrong. Before we were
getting constant phase difference across channels for limited
bandwidth and with time when we split single antenna signal using
splitter and fed two channels of USRP but now it is not doing so.
This happened on Friday that after getting a series of correct
results : constant phase difference across channels by feeding
signal using splitter as mentioned above, we suddenly started to
receive wrong data: random phase across channels and with time
using the same setup with splitter. The thing we did was setting
gain to near maximum and receiving 100 MHz sample rate. But I don't
think amplifier has damaged because in this usrp we have four
independent channels and when we connected the splitter to unused
channels then also we got wrong data. What can go wrong that USRP is
streaming data but phases are wrong? What do you think? Please let
me know.
Regards,
Koyel
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Does it look better again when you reduce the gain?
What is the magnitude of the signals going to the RX ports?
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