----- Original Message -----
Sent: Sunday, September 25, 2011
17:04
Subject: Re: [Discuss-gnuradio] X-Ray
flare observations with GnuRadio software
On 25/09/11 08:29 AM, Patrik Tast wrote:
Most interesting,
Tell us more how you did it.
- antenna used?
- daugherboard?
- etc
Many SDR users in Northern Scandinavia are up day and
night listening on submarine traffic on VLF.
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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