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1. VLF: Some natural signals (score: 1): Author: Paul Nicholson <[email protected]>; Date: Sun, 23 Apr 2017 06:33:38 +0000; The 'dawn chorus' recorded this morning at Todmorden, 05:39 to 05:53. http://78.46.38.217/au170423a.mp3 15 minutes, mono 64 kbps, 6.4 Mbytes. https://en.wikipedia.org/wiki/Dawn_chorus_(electromagneti; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00316.html (9,845 bytes)
2. Re: VLF: Some natural signals (score: 1): Author: Marco IK1ODO -2 <[email protected]>; Date: Sun, 23 Apr 2017 10:27:34 +0200; The 'dawn chorus' recorded this morning at Todmorden, 05:39 to 05:53. http://78.46.38.217/au170423a.mp3 15 minutes, mono 64 kbps, 6.4 Mbytes. https://en.wikipedia.org/wiki/Dawn_chorus_(electromagnet; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00317.html (9,612 bytes)
3. Re: VLF: Some natural signals (score: 1): Author: Andy Talbot <[email protected]>; Date: Sun, 23 Apr 2017 09:46:56 +0100; Is that recorded with antenna direct into soundcard (metaphorically speaking ) ? Or with any frequency translation or processing ? I'll play it to the birds in my garden as they cluster round the f; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00318.html (11,088 bytes)
4. Re: VLF: Some natural signals (score: 1): Author: Paul Nicholson <[email protected]>; Date: Sun, 23 Apr 2017 09:31:08 +0000; Yes. There's no frequency shift, just amplification of the audio frequencies present on the E-field probe. Not even that much amplification, on the order of x50 voltage gain before the soundcard (wh; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00319.html (10,583 bytes)
5. RE: VLF: Some natural signals (score: 1): Author: <[email protected]>; Date: Sun, 23 Apr 2017 06:34:07 -0400; Thanks Paul, What a wonderful sound. Unfortunate that bird's magnetic sensors dont have the sensitivity/bandwidth for what you captured; they could perhaps tune their nav systems for reduced sensitiv; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00321.html (11,644 bytes)
6. Re: VLF: Some natural signals (score: 1): Author: Claudio Pozzi <[email protected]>; Date: Sun, 23 Apr 2017 16:14:44 +0200; Hi Jim. Interesting question,but how can I made this audio translation? The 10 mHz signal period (T=1/F) is 100 seconds. So if I modulate in frequency or in amplitude a 1000 Hz carrier what sound can; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00322.html (11,766 bytes)
7. RE: VLF: Some natural signals (score: 1): Author: <[email protected]>; Date: Sun, 23 Apr 2017 11:38:34 -0400; Hello Claudio, Yes I agree with your sentiment, I was thinking of listening to the time-domain sub-Hz content; mixing or demodulating to remove any carrier (using Spectrum Lab or Matlab for example); /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00325.html (14,674 bytes)
8. Re: VLF: Some natural signals (score: 1): Author: Andy Talbot <[email protected]>; Date: Sun, 23 Apr 2017 17:00:34 +0100; I once made an overnight recording of (the carrier of) some HF broadcast signals around 3MHz arriving via a skywave path. The recording was done using G3PLX's Dopplergram software, and was made a; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00326.html (16,801 bytes)
9. RE: VLF: Some natural signals (score: 1): Author: <[email protected]>; Date: Mon, 24 Apr 2017 15:51:31 -0400; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-04/msg00347.html (25,226 bytes)
10. Re: VLF: Some natural signals (score: 1): Author: [email protected]; Date: Mon, 1 May 2017 11:33:37 -0230 (NDT); Hi Stefan, Amazing work on ULF. This is very inspring for for someone lamenting over yet another fried VLF helix. Undaunted, I've sought more wire to wind a new one. It is easy to lock to NAA and may; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00005.html (11,677 bytes)
11. Re: VLF: Some natural signals (score: 1): Author: DK7FC <[email protected]>; Date: Mon, 01 May 2017 16:18:01 +0200; Hi Joe, Am 01.05.2017 16:03, schrieb [email protected]: Hi Stefan, Amazing work on ULF. This is very inspring for for someone lamenting over yet another fried VLF helix. Thank you :-) It is easy to lock; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00006.html (13,113 bytes)
12. Re: VLF: Some natural signals (score: 1): Author: Bill de Carle <[email protected]>; Date: Mon, 01 May 2017 18:46:12 -0400; My grabber is currently active in FN15nt (70 uHz/bin) centered on 8270 Hz. Might be able to see Joe if he puts a carrier on the air for a few hours. http://www.magma.ca/~ve2iq/grabs/ Bill VE2IQ Am 01; /rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00012.html (11,475 bytes)

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