Interesting. I tried to run an Odroid C1+ and two RTLSDRs with POE and found the power was not reliably sufficient.
Do you see Ethernet RFI? I found a lot of that with similar confine a few years back. Sent from my iPhone > On Sep 20, 2019, at 12:59 PM, Glen Langston <glen.i.langs...@gmail.com> wrote: > > Very nice work Marcus! > > We’re working on various images of the sky too. I’ve now got 4 horns > running simultaneously > making transit observations at different elevations. These all use > gnu radio for the data takings software and run on Raspberry Pi 4s in > computer boxes > at the base of each horn. We need scans spaced by about 5 degrees elevation, > so > takes 23 scans, divided by 4 telescopes, = 6 days. Plus calibration > observations. > We now have a central host that has a GPS receiver and provides a NTP timing > reference > to each of the Pis. All are now powered over ethernet, so only one ethernet > cable to each horn. > > The code and documentation is all at > > http://www.github.com/WVURAIL/gr-radio_astro > > and analysis which is really, not a part of gnu-radio, at > http://www.github.com/glangsto/analyze > > Regards > > Glen > > PS What software are you using for gridding/mapping? > > <HornsInGreenBank - 1.jpg> >> On Sep 20, 2019, at 12:14 PM, Marcus D. Leech <patchvonbr...@gmail.com> >> wrote: >> >>> On 09/20/2019 07:47 AM, Glen Langston wrote: >>> Very nice map of the entire sky. >>> I’m looking forward to your memo. >>> >>> Best regards >>> >>> Glen >> A goodly chunk of it anyway--about 75% of the northern sky >> >> We might be able to get another 5 degrees northwards, but towards the south, >> we can't go below -35 without running into ground clutter issues... >> >> >>> >>>> On Sep 20, 2019, at 12:16 AM, Marcus D. Leech <patchvonbr...@gmail.com> >>>> wrote: >>>> >>>> I haven't posted any CCERA updates recently--mostly because there hasn't >>>> been much of relevance to this group. >>>> >>>> But the most recent update at least contains a pretty picture: >>>> >>>> http://www.ccera.ca/uncategorized/ccera-completes-first-pass-of-21cm-sky-survey/ >>>> >>>> I'll be working on a memo in our "memo" series about the overall system, >>>> software, etc. >>>> >>>> Marcus Leech >>>> President >>>> Canadian Centre for Experimental Radio Astronomy >>>> http://www.ccera.ca >>>> >>>> >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >
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