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1. Re: LF: trace 8270 nr Moscow ? (score: 1)
Author: Paul Nicholson <>
Date: Fri, 11 Jul 2014 14:01:26 +0000
Curious. Appears to fade down with the background, so distant? Well, nothing stands out here in Todmorden, 00:00 to 03:00 UT in 96 uHz. PS some photos of my loop antenna, rebuilt last weekend to be a
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-07/msg00040.html (9,715 bytes)

2. Re: LF: Re[2]: LF: trace 8270 nr Moscow ? (score: 1)
Author: Paul Nicholson <>
Date: Wed, 16 Jul 2014 12:32:45 +0000
Thanks! Very nice. I particularly like the spectrograms which reveal the shifting cavity mode spectrum of the distant sferics as the ionosphere height increases. Have you seen anything more of the m
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-07/msg00049.html (10,831 bytes)

3. Re: LF: RE: ZEVS question (score: 1)
Author: Paul Nicholson <>
Date: Fri, 29 Aug 2014 05:41:18 +0000
Carrier comes on and off at irregular times each day. Here is a plot of 82Hz over the last three days http://abelian.org/vlf/tmp/zevs-140829a.gif (1.67mHz bandwidth, 10 minute samples) It's a strong
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-08/msg00209.html (9,614 bytes)

4. VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Sun, 30 Nov 2014 06:27:36 +0000
In only a few weeks we will be half way through the VLF season. Is there any interest to try some more experiments? - Extending the T/A distance record further into Europe? - Try lower frequencies -
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00323.html (9,288 bytes)

5. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Sun, 30 Nov 2014 19:11:57 +0000
Recording. LWPC prediction for the path assuming 150uW ERP http://abelian.org/vlf/tmp/141130a.gif Looks like stable phase from 22:00 UT to 08:00, a much longer window than we had in June. -- Paul Nic
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00340.html (9,438 bytes)

6. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Sun, 30 Nov 2014 20:01:27 +0000
Maybe something is not working. No sign of W4DEX at Forest, VA, range 254km, checked 17:30 to 19:30 UT. Should be a strong signal at that range. There's a bit of a signal, unstable, varying 3 to 5 mH
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00342.html (9,690 bytes)

7. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Sun, 30 Nov 2014 21:15:26 +0000
Certainly transmitting - but where is the carrier? Without GPS lock, the HP source should be OCXO stable anyway? I searched at Forest +/- 0.5Hz now maybe I have found you, 0.1Hz low? The frequency lo
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00347.html (10,008 bytes)

8. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Sun, 30 Nov 2014 22:06:14 +0000
I'll leave running a spectrum plot from Forest, updating about every 10 minutes http://46.4.26.83/sp8820_vlf35.png -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-11/msg00354.html (9,967 bytes)

9. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Mon, 01 Dec 2014 08:23:00 +0000
Spectrogram of W4DEX at Forest, VA (range 254km) through Mike Smith's receiver which is streamed over the Internet, http://abelian.org/vlf/tmp/141201a.png Appeared close to 8819.9 Hz then after the s
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00009.html (10,029 bytes)

10. Re: VLF: Experiments - anyone? (score: 1)
Author: Paul Nicholson <>
Date: Mon, 01 Dec 2014 17:31:52 +0000
Glad you found the problem Dex. Will look forward to another test tonight or soon. I'll try to put out my new E-field receiver this evening if I can finish some alterations quickly. It has much lower
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00018.html (9,506 bytes)

11. Re: VLF: 8270 Hz (score: 1)
Author: Paul Nicholson <>
Date: Mon, 01 Dec 2014 18:05:03 +0000
Bearing looks a few degrees south of bearing for DJ8WX and signal is a bit weaker than normal for Uwe. It's a lovely sharp line at about 0.12fT and the frequency appears exact. -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00020.html (8,320 bytes)

12. Re: LF: 8820 Hz again (score: 1)
Author: Paul Nicholson <>
Date: Mon, 01 Dec 2014 22:45:57 +0000
Strong signal at Forest VA, frequency looks good. http://46.4.26.83/sp8820_vlf35.png updates about every 10 mins with the last 20 mins of signal. New E-field rx running tonight at Todmorden, alongsi
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00027.html (8,749 bytes)

13. VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 13:07:32 +0000
Spectrogram of W4DEX at Forest, VA (range 254km) http://abelian.org/vlf/tmp/141202a.png No sign of any frequency lock problems now. All the energy is concentrated in one frequency bin so the signal a
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00033.html (11,802 bytes)

14. Re: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 16:45:39 +0000
Another plot from Wolf's receiver at Bielefeld, http://abelian.org/vlf/tmp/141202e.gif This covers the full transmission from 22:30 UT in 50.5 uHz bandwidth. The line at 8820.0000 is 11.7 dB above th
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00035.html (10,143 bytes)

15. Re: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 18:20:07 +0000
Indeed it is tempting. With that 50.5 uHz spectrum the odds of a false peak is probably one in a few tens of thousands. Perhaps Dex should change frequency a small amount before tonight's transmissio
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00040.html (12,254 bytes)

16. Re: LF: Re[2]: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 19:16:14 +0000
LWPC prediction for path W4DEX to KO85HA http://abelian.org/vlf/tmp/141130b.gif Signals are ~20dB weaker because of the extra distance which is mostly over land - much higher attenuation. Map http://
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00044.html (10,558 bytes)

17. Re: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 20:36:41 +0000
I swept a range of times and bandwidths and this one from Bielefeld is even more convincing http://abelian.org/vlf/tmp/141202j.gif That's 13.4 dB S/N averaged over the 3 hours. More from LWPC Bielefe
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00048.html (10,508 bytes)

18. Re: LF: 8820 Hz QRT at 2030UT (score: 1)
Author: Paul Nicholson <>
Date: Tue, 02 Dec 2014 22:07:45 +0000
Oh well, never mind. Another try soon. The receivers all continually record on 10 day loops so fire up any time. There's plenty of data to examine from last night. Have to try to understand how the s
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00051.html (8,622 bytes)

19. Re: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Thu, 04 Dec 2014 18:00:53 +0000
Examining W4DEX at Todmorden overnight on 1st/2nd Dec... S/N dB in 278uHz and signal phase in 1 hour steps: From dB phase 22:30 7.6 80.4 23:00 8.9 90.9 23:30 9.1 115.6 00:00 6.3 106.2 00:30 7.9 30.6
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00061.html (11,712 bytes)

20. Re: VLF: W4DEX in Europe at 8820 Hz (score: 1)
Author: Paul Nicholson <>
Date: Fri, 05 Dec 2014 07:18:42 +0000
A spectrum from the natural radio receiver at Sebring Florida 27.516N,81.517W range 869.4 km run by Joel Gonzalez, http://abelian.org/vlf/tmp/141204b.png S/N is 12.6 dB in 55.5 uHz. The noise level t
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00064.html (11,483 bytes)


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