Thank you both, Marcus and Rob, for your responses! That clarifies
things—filter latency in the FPGA explains the dependency on sample rate. I
hadn’t fully considered that before. A signal change at the antenna takes time
to propagate, and with different filters engaged at varying sample rates,
Does anyone know if there is a way to get predictable phase offsets from an
X410? I am finding that from run-to-run, the 4 channels in an X410 have
completely random phase offsets from each other. I didn’t necessarily expect
the phase offsets to be zero, but was hoping they would at least be c
Okay but just a reminder, as far as I know only the one example script
"tx_waveforms.cpp" was fixed to address this problem, so it may be easier
to just print the latest version of that and follow that code structure in
your application (since I assume you're not just running tx_waveforms).
On Thu
Great, thank you! Will upgrade to UHD 4.8 and give it a shot.
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Thanks for that reminder. I took a look at that example. We are using the
RFNoC API (using the python bindings) and not the MultiUSRP API. I assume the
same sequence can be achieved setting up the SDR through RFNoC?
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Hi Heath and Marcus,
I was actually "R&D's plate" for this one. We worked through it and found
the issue. The root cause is the startup sequence in almost every example
UHD script is a bit out of order and had to be reorganized in terms of
clock setup and synchronized channel tuning. This problem
Hi, I have an X440 loaded with the X4_200 FPGA image running UHD 4.6. Using
the RFNoC API, I am streaming the same 1 MHz tone into two channels at the
same time (timed command) using a TX streamer going through the DUC
(upsampling from 10.24MSPS to 245.76MSPS) through the same Radio block
(same dau
On 27/03/2025 12:46, Heath Stamm wrote:
Hi, I have an X440 loaded with the X4_200 FPGA image running UHD 4.6.
Using the RFNoC API, I am streaming the same 1 MHz tone into two
channels at the same time (timed command) using a TX streamer going
through the DUC (upsampling from 10.24MSPS to 245.
I'm not the expert here but from everything I know about this issue, I
don't think it's possible just because the X410 apparently does not support
timed tuning... Here's the code excerpt from a commit where tx_waveforms
was specifically modified to exclude the X410 from timed tuning
(
https://githu
On 27/03/2025 15:31, Mann, John - 0662 - MITLL wrote:
Does anyone know if there is a way to get predictable phase offsets
from an X410? I am finding that from run-to-run, the 4 channels in an
X410 have completely random phase offsets from each other. I didn’t
necessarily expect the phase of
I'm not super familiar with the RFNoC stuff or the python workflow, but the
real key is to do timed frequency tuning of each channel, as seen in the
changes from this commit :
https://github.com/EttusResearch/uhd/commit/de1542331ff5f9dc29e252814ddeaa645f5641f3
As long as the API you're using provi
On 27/03/2025 14:55, Chris Rogers wrote:
I'm not super familiar with the RFNoC stuff or the python workflow,
but the real key is to do timed frequency tuning of each channel, as
seen in the changes from this commit :
https://github.com/EttusResearch/uhd/commit/de1542331ff5f9dc29e252814ddeaa645f
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