|From:||Marcus D. Leech|
|Subject:||Re: [Discuss-gnuradio] X-Ray flare observations with Gnu Radio software|
|Date:||Sun, 25 Sep 2011 10:04:30 -0400|
|User-agent:||Mozilla/5.0 (X11; U; Linux i686; en-US; rv:184.108.40.206) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10|
On 25/09/11 08:29 AM, Patrik Tast wrote:
I use a square-loop antenna, roughly 1.5M in diameter. I have roughly 80M of 22ga wire wound onto it.
This feeds a Behringer Mini-Mic 800 microphone preamplifier, which is then fed into a 96KHz sound
card--no USRP required.
The software I wrote for this I call SIDsuite. It's available via GitHub:
It works by measuring the received signal stength for various VLF transmitters--most of them are indeed
submarine communications systems. The signal strength follows a diurnal pattern involving solar
radiation and the D and E layers of the ionosphere. When there are strong solar X-ray events, that
pattern is disturbed--sometimes spectacularly.
-- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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