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 offsets to be zero, but was hoping they
would at least be consistent.
John
At the very least, use timed-commands to tune it. The ZBX board that
does the analog up/down conversion uses LMX2572
synthesizers, and I don't know how easy it is to phase-align those
synthesizers in practice.
*From:* Chris Rogers <c1337rog...@gmail.com>
*Sent:* Thursday, March 27, 2025 1:51 PM
*To:* Marcus D. Leech <patchvonbr...@gmail.com>
*Cc:* usrp-users@lists.ettus.com
*Subject:* [EXT] [USRP-users] Re: X440 Phase Coherent but not Phase
Aligned
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
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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 is fixed in UHD 4.7+ if you look at the
"tx_waveforms.cpp" example code... For your application, just make
sure to follow the same startup sequence.
Hope this helps,
Chris
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