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21. Re: VLF: 8270 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Sat, 06 Dec 2014 19:40:54 +0000

Some signals on the band would be handy. Trying to test new E-field rx against old with the two planted side by side on a bleak moorland hillside. Needed some weak signal so made up a little near fi

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00066.html (10,268 bytes)

22. VLF: 8819.9 Hz in Virginia? (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 11 Dec 2014 19:25:48 +0000

A signal appears close to 8819.9 Hz at Forest VA. Doesn't look like Dex, frequency is not stable and not exact multiple of 0.1Hz. http://abelian.org/vlf/tmp/141211a.gif AA5BW perhaps? It would be qui

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00097.html (8,927 bytes)

23. Re: VLF: 8819.9 Hz in Virginia? (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 11 Dec 2014 19:45:56 +0000

In a bandwidth more suitable for the width of the signal http://abelian.org/vlf/tmp/141211b.gif I think this is probably Dex running without GPS lock, the frequency offset is about right for the free

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00098.html (9,373 bytes)

24. Re: VLF: 8819.9 Hz in Virginia? (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 11 Dec 2014 20:10:44 +0000

And neither is Dex so we have a mystery signal! Tomorrow I'll look back over the 10 day recording loop. Meanwhile the spectrum plot updates every 10 minutes at http://46.4.26.83/sp8820_vlf35.png -- P

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00100.html (9,458 bytes)

25. Re: VLF: 8819.9 Hz in Virginia? (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Fri, 12 Dec 2014 08:24:36 +0000

Spectrogram covering 24 hours yesterday http://abelian.org/vlf/tmp/141211c.gif A wandering signal from a crystal source of average stability. These are fairly common when you dig deep enough into the

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00106.html (9,709 bytes)

26. Re: LF: 8957 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Fri, 12 Dec 2014 21:23:22 +0000

Spectrum at Forest VA, updating every 10 minutes http://46.4.26.83/sp8957_vlf35.png Timing system at Todmorden behaving badly on the E/W loop tonight. Soundcard rate xtal drifting due to drafts. If i

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00115.html (9,132 bytes)

27. Re: LF: Re: 8957 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Sat, 13 Dec 2014 20:40:01 +0000

W4DEX at Todmorden and Bielefeld (DL4YHF) in 1 hour steps Start Todmorden Bielefeld S/N Phase S/N Phase 21:00 8.9dB -16.9 0.6dB 21:30 10.7dB -29.0 1.1dB 22:00 7.7dB -51.0 -5.3dB 22:30 4.1dB -73.3 -3.

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00123.html (11,224 bytes)

28. Re: LF: Re: 8957 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Sun, 14 Dec 2014 10:11:03 +0000

Last night Dex was testing at 9177 Hz. W4DEX at Todmorden and Bielefeld (DL4YHF) in 1 hour steps at 9177 Hz: Start Todmorden Bielefeld S/N Phase S/N Phase 22:00 10.4dB -39.3 5.8dB -62.2 22:30 11.7dB

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00130.html (12,063 bytes)

29. VLF: W4DEX reaching Italy and Germany? (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Sun, 14 Dec 2014 11:59:16 +0000

At Cumiana Italy 44.96N,7.42E run by Renato Romero IK1QFK: Examining 9177Hz S/N and phase in 1 hour steps (278uHz) 20:00 2.9dB 20:30 3.2dB transmission started around 21:20 21:30 6.2dB -102.3 22:00 1

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00131.html (9,444 bytes)

30. VLF: W4DEX to DL4YHF at 8822 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Tue, 16 Dec 2014 05:37:06 +0000

W4DEX transmitting 8822 Hz carrier 2014-12-15 20:50 to 2014-12-16 04:00 UT. Reception at Bielefeld Germany by DL4YHF http://abelian.org/vlf/tmp/141216a.gif This confirms a previous reception at 8820

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00148.html (9,296 bytes)

31. Re: VLF: W4DEX to DL4YHF at 8822 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Tue, 16 Dec 2014 16:19:41 +0000

Spectrogram of W4DEX at Forest, VA (Mike Smith KE4RJQ) showing a very strong signal at range 254km, http://abelian.org/vlf/tmp/141216b.png I played around with gnuplot to make this fancy 3D spectrogr

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00152.html (9,227 bytes)

32. Re: VLF: W4DEX to DL4YHF at 8822 Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Wed, 17 Dec 2014 17:25:41 +0000

Another long transmission last night from Dex. Signal and noise at Forest, VA - KE4RJQ at range 254km http://abelian.org/vlf/tmp/141217a.png http://www.vlf.it/smith1/opticalink.html on Renato Romero'

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00155.html (10,728 bytes)

33. VLF: W4DEX to IK1QFK at 8822Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 18 Dec 2014 18:53:56 +0000

Another night of poor reception further into Europe but, for a couple of hours W4DEX came out of the noise at Cumiana http://abelian.org/vlf/tmp/141218a.gif and averaged 11.4dB S/N in 139 uHz. Except

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00156.html (9,420 bytes)

34. Re: VLF: W4DEX to IK1QFK at 8822Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 18 Dec 2014 20:59:57 +0000

Last night was the best reception of W4DEX so far in Todmorden. S/N and phase in one hour steps - 19:00 -1.4dB 20:00 7.0dB -143.2 21:00 7.5dB 133.9 22:00 9.6dB 138.6 23:00 10.8dB 116.4 00:00 12.7dB 1

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00159.html (10,852 bytes)

35. Re: VLF: W4DEX to IK1QFK at 8822Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Thu, 18 Dec 2014 22:13:39 +0000

That's about right for a quiet night. That's after sferic blanking - before the blanker the background is some 20dB or more higher. The system noise floor is about 0.2 fT RMS in 1Hz. There happens t

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00161.html (9,851 bytes)

36. Re: VLF: W4DEX to IK1QFK at 8822Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Fri, 19 Dec 2014 18:33:12 +0000

Overnight 2014-12-18/19: The carrier was detectable in IK1QFK's on-line receiver at Cumiana from around 23:00 to 05:00 with a gap around 03:00. It barely shows up on a spectrogram though, http://abel

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00165.html (11,010 bytes)

37. Re: VLF: W4DEX to IK1QFK at 8822Hz (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Sat, 20 Dec 2014 20:20:56 +0000

Last night: 2014-12-19/20 Cumiana IK1QFK - best S/N was 11.2dB from 00:17 to 05:47 in 50.5uHz, http://abelian.org/vlf/tmp/141220a.gif Signal was a bit lower than previous night and the noise a bit hi

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00185.html (10,886 bytes)

38. Re: VLF: 8270 Hz BPSK (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Mon, 22 Dec 2014 21:59:03 +0000

Your last transmission I think was on 2014-11-07 and I just examined the recording: You were S/N 14.7dB in 278uHz between 12:00 and 14:00. Signal is strong enough to send data quite fast. You could u

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00222.html (10,612 bytes)

39. Re: VLF: 8270 Hz BPSK (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Mon, 29 Dec 2014 12:42:22 +0000

No, the transmissions are invisible on a spectrogram. Really they are quite stealthy, they just look like noise. So I have to know the exact start time. I see some carrier from you which ends about

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00295.html (9,185 bytes)

40. Re: VLF: 8270 Hz BPSK (score: 1)

Author: Paul Nicholson <vlf0403@abelian.org>

Date: Mon, 29 Dec 2014 15:19:07 +0000

I searched for the message using start times between 11:00:00.0 and 11:00:02.0 but nothing decoded. The earlier carrier had S/N 11.7 dB compared with the 14.7 dB you had in November. Hopefully the S/

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00297.html (9,570 bytes)