On 06/08/2018 12:06 PM, Glen I Langston wrote:
Hi Marcus,
Thanks for your note. Yes, certainly I know that I should have not had IQ
balance running now,
but I falsely assumed leaving the default setting would not hurt anything.
Really a
major time sink, finding this trivial problem…
Concerning your use of the Odroids did you say use VNC with them or just ssh
in and run
without graphics display? If you do use VNC, which VNC program did you
install?
Thanks again,
Glen
I've been in the "I/Q correction hurting me" space before. Took me
quite a while to figure out what was going on, too...
My Odroid systems (C1 and XU4Q) are oriented towards completely-headless
operating. For 99.9% of an observing run, you
don't need real-time visualization. You just need the data recorded
for further processing.
So, to that end, I've been working, as you may know, on a system to
"meet in the middle". With data recording and 1st-order processing
happening on the Odroids, and quasi-real-time visualization via the
web. Starting/stopping experiments is also via the web, as is rudimentary
system configuration.
I call this system "Orion". Observational Radio Instrument On the
Net. I hope to have system images available for both C1 and XU4Q
sometime in
the next "little while". For certain values of "little while".
Right now the system supports what I call a "combo radiometer" mode with
both FX and "fast" versions. This is a two-channel affair, computing
the total power on each channel, the differential, and the
cross-correlation, as well as the spectral estimates for both channels.
The "fast"
version eliminates the FX structure, and does scalar
cross-correlation only, and the spectral estimators run in a "stuttered"
mode. This
should roughly double the maximum sample rate on an XU4Q to somewhere
around 12-15Msps.
The other mode, that I just added, is really targeted at a Odroid C1
with 3 RTLSDR dongles, to do that D1 exploration we discussed on another
forum.
The current code-base (most of it, some of the system-config stuff isn't
in the repo yet, and I don't have a Makefile yet) is at:
https://github.com/ccera-astro/school_telescopes
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