I believe if you don't set the end of burst flag it won't reset the
accumulator.
On another note, how difficult would it be to reset the accumulator at
the start of burst. While doing it at the end makes it coherent with
itself, the xmit waveform still has a starting phase change from pulse
On 05/29/2019 06:49 PM, Michael West via USRP-users wrote:
Thanks to Michael's persistence, we did find an issue in the DUC and
DDC where the phase accumulator was the wrong resolution (24-bit
instead of 32-bit) and was not being reset at the end of each burst.
The fix is now available on the
Thanks to Michael's persistence, we did find an issue in the DUC and DDC
where the phase accumulator was the wrong resolution (24-bit instead of
32-bit) and was not being reset at the end of each burst. The fix is now
available on the head of the UHD-3.14 branch and will be included in the
Hi Mike,
Let's keep the discussion on the mailing list. I attach the scripts as
they are quite small. There is however a data folder with two 4MB files
containing noise in complex short format. The version of the archive
with those files is here:
Hi all,
I looked at this thread and it reminded me of something.
Once we purchased few X310 with UBX160 daughter-boards.
One of them had some frequency offset on Tx channel, that decreased over
time it was running, but very slowly.
The daughter-board was then replaced by National Intruments
I have switched and am currently running the release 3.14.0.0
Sent from my iPhone
On Apr 6, 2019, at 8:58 AM, Marcus D. Leech wrote:
On 04/05/2019 11:43 AM, Michael R. Freedman wrote:
> Hello,
>
>
>
> If I remove the DSP from the equation by setting the DSP tuning policy to
> manual and
On 04/05/2019 11:43 AM, Michael R. Freedman wrote:
Hello,
If I remove the DSP from the equation by setting the DSP tuning policy
to manual and assigning it to zero, I am coherent from tx to rx on all
frequencies. I'm now beginning to think that the DSP is doing it's
tuning differently for
On 04/05/2019 11:43 AM, Michael R. Freedman wrote:
Hello,
If I remove the DSP from the equation by setting the DSP tuning policy
to manual and assigning it to zero, I am coherent from tx to rx on all
frequencies. I'm now beginning to think that the DSP is doing it's
tuning differently for
Hello,
If I remove the DSP from the equation by setting the DSP tuning policy
to manual and assigning it to zero, I am coherent from tx to rx on all
frequencies. I'm now beginning to think that the DSP is doing it's
tuning differently for tx and rx. Or there is an accumulated error in
On 03/27/2019 04:48 PM, Michael R. Freedman wrote:
This is on a single UBX card within a single USRP.
./uhd_usrp_probe --args=addr=192.168.40.100
[INFO] [UHD] linux; GNU C++ version 7.3.0; Boost_106501;
UHD_3.14.0.0-0-unknown
[INFO] [X300] X300 initialization sequence...
[INFO] [X300]
On 03/27/2019 03:39 PM, Michael R. Freedman via USRP-users wrote:
Marcus,
I tried a 10MHz LOOffset with no change. I also tried it at 1155.0MHz
and 1160.0MHz. At 1155 the phase rolls... at 1160 it does not.
Mike
Could you give us a dump of uhd_usrp_probe for an X310 that displays
this
Marcus,
I tried a 10MHz LOOffset with no change. I also tried it at 1155.0MHz
and 1160.0MHz. At 1155 the phase rolls... at 1160 it does not.
Mike
On 03/27/2019 11:10 AM, Marcus D. Leech via USRP-users wrote:
On 03/27/2019 10:41 AM, Michael R. Freedman via USRP-users wrote:
Any
On 03/27/2019 10:41 AM, Michael R. Freedman via USRP-users wrote:
Any thoughts on this?
Mike
Given that in this case, the incoming carrier will be fighting DC-offset
removal rather hard, I wonder if this is a weird artifact of DC-offset
removal?
If you use offset tuning on the RX, do
Any thoughts on this?
Mike
On 03/25/2019 01:04 PM, Michael R. Freedman via USRP-users wrote:
Marcus,
190Hz is what we calculated. I have attached a text file with the
data we used. This is a single UBX40 tuned to 155MHz sampling at 2MHz.
Mike
On 03/25/2019 12:34 PM, Nick Foster
Marcus,
190Hz is what we calculated. I have attached a text file with the
data we used. This is a single UBX40 tuned to 155MHz sampling at 2MHz.
Mike
On 03/25/2019 12:34 PM, Nick Foster wrote:
Well, according to your description, you could transmit a carrier from
TX to RX (through an
Well, according to your description, you could transmit a carrier from TX
to RX (through an attenuator) with both sides set to the same frequency.
Your received signal should look like a sine wave at the frequency of the
offset.
On Mon, Mar 25, 2019 at 9:16 AM Michael R. Freedman via USRP-users <
Hello,
Do you have any suggestions as to how to measure the frequency delta
between the transmit channel and the receive channel?
As I sat down to do this, I realized I have no real way to do that.
Mike
On 03/24/2019 03:23 PM, Marcus D. Leech via USRP-users wrote:
On 03/24/2019 02:39
Marcus,
Thanks for engaging in this. I will have frequency deltas for you first
thing this afternoon.
Mike
On 03/24/2019 03:07 PM, Marcus Müller wrote:
I can fully understand that! You don't happen to have an estimate for
that frequency offset's magnitude? Is it always the same drift?
Marcus,
In this setup I have 6 UBX-160 v2 and 6 UBX-40 v2. The USRPs are all
X310 Rev 11, Rev_compat 7. I have tried 3.13.1 as well as 3.14-rc3.
Thanks!
Mike
On 03/24/2019 03:23 PM, Marcus D. Leech via USRP-users wrote:
On 03/24/2019 02:39 PM, Freedman, Michael - 1008 - MITLL via
On 03/24/2019 02:39 PM, Freedman, Michael - 1008 - MITLL via USRP-users
wrote:
It is not just a phase offset. It is a frequency offset. The phase drifts
between the two. I can tolerate a phase offset at startup. A freq offset
however is causing problems.
Mike
Sent from my iPhone
On Mar 24,
I can fully understand that! You don't happen to have an estimate for
that frequency offset's magnitude? Is it always the same drift? I'm
trying to narrow down analog vs numerical accuracy issues here.
Best regards,
Marcus
On Sun, 2019-03-24 at 18:39 +, Freedman, Michael - 1008 - MITLL
wrote:
It is not just a phase offset. It is a frequency offset. The phase drifts
between the two. I can tolerate a phase offset at startup. A freq offset
however is causing problems.
Mike
Sent from my iPhone
On Mar 24, 2019, at 4:28 AM, Marcus Müller wrote:
Can you elaborate on what "not
Can you elaborate on what "not coherent" means to you – the relative
phase should be constant after each tune, but if you don't tune
simultaneously, i.e. with timed commands, random at each tune.
Best regards,
Marcus
On Sat, 2019-03-23 at 17:06 -0400, Michael R. Freedman via USRP-users
wrote:
>
Hello,
I have an issue where I tune both the TX and RX side of a UBX40 card in
an X310 to the same frequency and find that the transmitted signal and
what is received are not coherent. I am using an external 10MHz
reference and have tried the documented suggestions.
at 150MHz it is
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