Hi Kevin,
I got inverted spectrum (that means sign of I or Q is changed) when I
only set the frequency with use of timed commands. I described the
ranges in the original post. We did measurements in 100-500MHz band. You
can see phase difference between two TwinRXes here:
https://imgur.com/4C09MSf
Pitor:
We've seen a similar issue and have worked around it by just using a slightly
different frequency. Can you post the frequencies that you're seeing it on? I
think Ettus should be able to duplicate. I saw an issue with spectral inversion
(I think I and Q are getting swapped somewhere) at 2
Hi,
After disconnecting LO cables signal on the daughter-board that imports
LOs disappears. So GNU Radio correctly configures distribution of LOs.
Also the +/- 90 degree changes happen completely deterministically in
given ranges of carrier frequencies.
So the question remains open: what is causi
Hi,
I don't know what this patch does, but there is not software required
under certain circumstances. The reference clock is 200 MHz and there
are a few PLLs which are used to generate your LOs. When the PLLs run in
interger-N mode (which can be defined in the API, when explicitly
setting the
To answer my own question:
https://github.com/EttusResearch/uhd/blob/master/CHANGELOG#L226
it seems the answer is yes.
--
Piotr Krysik
W dniu 03.04.2019 o 12:34, Piotr Krysik via USRP-users pisze:
> Hi,
>
> W dniu 03.04.2019 o 12:15, Fabian Schwartau via USRP-users pisze:
>> (...)
>> Keep in mind
Hi,
W dniu 03.04.2019 o 12:15, Fabian Schwartau via USRP-users pisze:
> (...)
> Keep in mind that it is not necessary to use LO-sharing to get a well
> defined phase relation between the channels. Depending on your
> frequency and bandwidth settings, it is possible to also achive this,
> as all LO
Hi,
yes, the result for multiple measurements (start ups of the system) at a
single frequency was different by multiples of 90°.
We did not investigated the problem any further, but I am quite sure
that gnuradio was not synchronizing the channels using the LO-sharing,
although it was selected.
Hi Fabian,
W dniu 03.04.2019 o 11:05, Fabian Schwartau via USRP-users pisze:
> Hi Piotr,
>
> we once had a very similar issue. But we also saw this on the same
> frequency when switching between frequencies. Can you try this as
> well? Just switch forth and back between two frequencies and just pl
Hi Piotr,
we once had a very similar issue. But we also saw this on the same
frequency when switching between frequencies. Can you try this as well?
Just switch forth and back between two frequencies and just plot one of
them?
As far as I remember the issue was because we were not using the
L
W dniu 03.04.2019 o 10:34, Piotr Krysik via USRP-users pisze:
> Hi all,
>
> I'm trying to do calibration of phase offsets between TwinRX channels.
>
> Configuration of X310 is following: two TwinRX'es, all sharing LOs from
> fist channel of the second TwinRX.
>
> The same signal is fed to all TwinR
Hi all,
I'm trying to do calibration of phase offsets between TwinRX channels.
Configuration of X310 is following: two TwinRX'es, all sharing LOs from
fist channel of the second TwinRX.
The same signal is fed to all TwinRX channels through a RF splitter.
What is expected is some additional grou
11 matches
Mail list logo
