On 2022-01-14 18:10, Paul Atreides wrote:
Ok thanks. In my haste I was mistaken in assuming that the LO gain
would track with the RF output gain. Silly mistake. I’m still getting
used to separating out the LO.
I can put this on a SpectrumAnalyzer (with an attenuator in line) on
Monday.
I’m trying to take channel to channel phase measurements to determine
what level of phase control I can have over one channel.
My guess is that if you extrude the LO out and then loop it back in,
with equal-length, equal-type cables, the channel-to-channel phase error
will be quite small.
If the phase-error that results is *fixed* and *characterized*, you can
simply rotate the phase of one of the baseband signals to compensate.
It’s not critical that I use GNURadio but it seemed like the logical
option as it’s very easy to make those adjustments.
I will look at the python API and see if the commands Rob was talking
about can be invoked using Python instead of writing a C++ application.
Then I’ll see if that is included in gr-uhd. If not, I can submit a
pull request with any changes.
I think the only "missing piece" is the control for the splitter module,
and with GR3.9+ you can use a code snippet to insert that, I think.
I’ll ping the gnuradio chat later tonight.
Thanks for the help guys are in
<end transmission>
On Jan 14, 2022, at 17:43, Marcus D. Leech <patchvonbr...@gmail.com>
wrote:
On 2022-01-14 17:35, Paul Atreides wrote:
Using a B210 at f_c of the N321. TX LO OUT0 is plugged into RX2 of
the B210
You might want to put an attenuator inline, since the LO output is a
couple of dBm, which is
"loud as a heavy metal concert" from the perspective of a receiver
input.
If the splitter isn't enabled in this test, then what you're seeing
is the leakage through the RF
switch that enables the splitter, which means that once the
splitter is turned on, the
signal will be even louder...
image.png
On Fri, Jan 14, 2022 at 5:32 PM Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 2022-01-14 17:30, Rob Kossler wrote:
These thare the UHD commands. I don't know how these translate
to gnuradio.
% set both LO sources to use external
set_tx_lo_source(“external”, “lo1”, 0)
set_tx_lo_source(“external”, “lo1”, 1)
% export the internal LO to the 1:4 splitter
set_tx_lo_export_enabled(true, “lo1”, 0)
% enable the 1:4 splitter output port
get_device()->get_tree()->access<bool>("mboards/0/dboards/A/tx_frontends/0/los/lo1/lo_distribution/LO_OUT_0/export").set(true)
I don't think the current GR code has support for controlling
the splitter, so a "code snippet" would likely be required.
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