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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:1.9.1.15) 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: https://github.com/patchvonbraun/SIDSuite 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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