[time-nuts] Fwd: [hpsdr] SDR experiment for the solar eclipse
alan.melia at btinternet.com
Thu Aug 3 15:57:29 EDT 2017
A Time Nut would measure phase change across the path of totality using GPS
locked SDR receivers :-)) As was done on the Eclipse that passed between the
UK and Iceland a couple of years ago. Keflavik NRK's ionospheric signal was
returned from inside the path of totality to most of the north of the UK,
giving a good measure of the change in height of the "apparent reflection
height" in the D-layer.
The quoted program looks a bit scattergun......lets record everthing and see
Hopefully it will involve a lot of school kids and maybe interest them in
science and electronics. If it does that it will be more useful that we
----- Original Message -----
From: "John Ackermann N8UR" <jra at febo.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Thursday, August 03, 2017 8:10 PM
Subject: [time-nuts] Fwd: [hpsdr] SDR experiment for the solar eclipse
> This is a little off-topic, but thought some of the group might be
> interested... so please forgive the interruption.
> -------- Forwarded Message --------
> Subject: [hpsdr] SDR experiment for the solar eclipse
> Date: Thu, 3 Aug 2017 15:07:57 -0400
> From: John Ackermann N8UR <jra at febo.com>
> To: FMT-nuts at yahoogroups.com, HPSDR list <hpsdr at lists.openhpsdr.org>
> ***** High Performance Software Defined Radio Discussion List *****
> I've been working with the "HamSci" group to set up an experiment for the
> solar eclipse: wideband recording of several HF bands before, during, and
> after the eclipse to look for propagation changes (or anything else that
> happens). All are welcome to participate in the experiment, and this is a
> *perfect* application for our SDRs!
> Here's the HamSci web page:
> Various SDRs and programs have wideband recording capability.
> Radios that support the HPSDR "old protocol" (which include Hermes-based
> boards as well as the Red Pitaya and possibly others) can do an even
> better trick: they can record multiple slices of the HF band
> simultaneously, thanks to work by Tom McDermott N5EG.
> Hermes can do 4 receivers (tested), Mercury/Metis/Atlas systems should
> handle 3 (not tested), and the Red Pitaya can support 6 (tested). This
> means that we can record most of the 80M band, and all of 40, 30, and 20M,
> in one gulp to look for effects of the eclipse -- frequency shift,
> propagation enhancement/reduction, noise floor, etc.
> I've written a Gnuradio .grc program that used N5EG's driver to record
> multiple receivers. By default it's configured for four receivers on
> 80/40/30/20M, but that's easy to change. I'll be posting that software to
> the TAPR github at https://github.com/TAPR as soon as we've done a bit
> more testing.
> This software runs on Linux and may work on Windows (I haven't had a
> chance to try, but Gnuradio has been ported to Windows). Recording 4
> 384kHz channels does take some computing horsepower and uses a lot of disk
> space -- about 3MB per receiver per second. My prior-generation i7
> machine with solid state drive seems to handle it OK.
> If you're interested in participating in this experiment, please (a) check
> out the HamSci web page; (b) check the ttps://github.com/TAPR in a day or
> two to grab the software and docs; and (c) feel free to contact me
> directly with any questions.
> John N8UR
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
More information about the time-nuts