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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*ULF\:\s+EbNaut\s+message\s+transmitted\s+from\s+ground\s+loop\s*$/: 25 ]

Total 25 documents matching your query.

1. ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Sat, 06 Apr 2019 22:39:52 +0200
Hello Markus, ULF, I'm now sitting in my car, TXing in the forest. It is very silent here. I can hear a faint 'crk' in the FETs when the phase toggles :-) Getting 2.44 A now on the 1130mground loop,
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00042.html (15,457 bytes)

2. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Paul Nicholson <>
Date: Sat, 6 Apr 2019 22:51:49 +0000
Solid copy here, obvious correct decode. Carrier Eb/N0 +1.0 dB, BER 39.1, constant reference phase. S/N: 17.03 dB in 133.5 uHz, -21.72 dB in 1Hz, -55.70 dB in 2.5kHz -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00043.html (11,264 bytes)

3. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Markus Vester <>
Date: Sat, 6 Apr 2019 22:56:08 +0000 (UTC)
Hi Stefan, perfect decodes at DL0AO: H-field (E-W): Eb/N0 = 5.0 dB(car), 5.4 dB(sym), E-Field: Eb/N0 = 11.0 dB(car), 10.9 dB (sym). Thanks for the nice nighttime activity! Best 73, Markus --Ursprüngl
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00044.html (15,521 bytes)

4. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Sun, 07 Apr 2019 01:10:12 +0200
Hello Paul, Markus, Wow, amazing! We've done it :-) 7 characters in 2 hours at ULF. A first message from DL > UK. Think about how long we needed to TX and stack for the 14 dB SNR spectrum peak 2 year
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00045.html (11,576 bytes)

5. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Paul Nicholson <>
Date: Sun, 7 Apr 2019 05:17:56 +0000
Yes well done, another milestone for the list - http://abelian.org/vlf/amateur-radio/ Perhaps also the longest ground loop antenna used for amateur transmission? -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00046.html (11,229 bytes)

6. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Roman <>
Date: Sun, 07 Apr 2019 10:46:32 +0300
Stefan, Paul - TNX for the chart! -- 73! Roman, RW3ADB
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00047.html (11,337 bytes)

7. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Sun, 07 Apr 2019 11:06:32 +0200
Am 07.04.2019 07:17, schrieb Paul Nicholson: Perhaps also the longest ground loop antenna used for amateur transmission? You never know. I can imagine that a few more people used similar antennas, bu
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00048.html (12,209 bytes)

8. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Sun, 7 Apr 2019 12:49:15 +0200 (CEST)
An OM (OT!) of my radio club told stories of his early radio experiments. He had a friend in some 100m distance and they lay out a small hidden wire into they ground between their QTHs, using the ear
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00049.html (11,763 bytes)

9. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: John Rabson <>
Date: Sun, 7 Apr 2019 14:20:15 +0200
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00050.html (14,460 bytes)

10. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Sun, 07 Apr 2019 17:54:05 +0200
Jacek, I'm right now trying to decode the message from your stream recording. First i did not expect much but a first attempt with vtread -T2019-04-06_20:25,+125m /jacek | vtcat -p | vtfilter -a th=4
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00054.html (13,723 bytes)

11. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Mon, 8 Apr 2019 22:44:42 +0200 (CEST)
this is the best i can do: ~$ vtblank -v -a30 -t80 -d0.0008 < pliktmp | vtmult -f 2970.1 | vtresample -r 240 | vtresample -r 10 | vtraw -oa | ebnaut -dp16K21A -r10 -c4 -v -f15 -f16 -M'DK7FC/P' -k16 -
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00055.html (14,057 bytes)

12. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Mon, 08 Apr 2019 23:39:37 +0200
Hello Jacek, Most interesting. Did you expect at all that you catched the signal? Below 3 kHz over that range, we thought it is completely impossible for amateurs, didn't we? Let's keep on trying! Be
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00056.html (16,568 bytes)

13. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Mon, 08 Apr 2019 23:41:55 +0200
Am 07.04.2019 01:10, schrieb DK7FC: Wow, amazing! We've done it :-) 7 characters in 2 hours at ULF. A first message from DL > UK. Think about how long we needed to TX and stack for the 14 dB SNR spec
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00057.html (12,048 bytes)

14. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 9 Apr 2019 22:02:07 +0200 (CEST)
Did you use your large computer at work to try to get the best result? no, unfortunately i had to give it back. but i did a simple search over a small set of parameters (a few hundred -a , -t and -d
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00059.html (11,663 bytes)

15. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Wed, 10 Apr 2019 08:59:24 +0200
RR Jacek, I did not get better results than 15.05 dB using vtread -T2019-04-06_20:25,+125m /jacek | vtcat -p | vtfilter -a th=4 -h bp,f=2970,w=3000 | vtfilter -h hp,f=2000,poles=8 -h lp,f=3600,poles=
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00060.html (14,695 bytes)

16. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Thu, 11 Apr 2019 21:39:48 +0200 (CEST)
Stefan, I've tried to bruteforce the right filtering and noise blanking parameters. So after a few thousand tries i get: :/stuff2/sq5bpf/vlf_stefan2$ vtcat -p < stefan_2970_1 | vtfilter
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00076.html (13,005 bytes)

17. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Thu, 11 Apr 2019 22:44:26 +0200
Hi Jacek, ULF, That's great! Amazing! 976 km distance in the ULF range! A decode at 15.63 dB carrier S/N. Can you describe your RX antenna and location/position of it? Thank you for your work! I will
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00077.html (15,444 bytes)

18. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: DK7FC <>
Date: Fri, 12 Apr 2019 09:25:16 +0200
Hi Jacek, For future tests it would be useful to have a grabber window on your side, showing 1...3 kHz in one spectrogram. It would be just to see how and when the QRN/M starts and when it has its mi
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00078.html (14,325 bytes)

19. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Fri, 12 Apr 2019 09:55:21 +0200 (CEST)
For future tests it would be useful to have a grabber window on your side, showing 1...3 kHz in one spectrogram. It would be just to see how and when the QRN/M starts and when it has its minimum at n
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00079.html (14,089 bytes)

20. Re: ULF: EbNaut message transmitted from ground loop (score: 1)
Author: Jacek Lipkowski <>
Date: Fri, 12 Apr 2019 10:11:06 +0200 (CEST)
That's great! Amazing! 976 km distance in the ULF range! A decode at 15.63 dB carrier S/N. Improved parameters: :/stuff2/sq5bpf/vlf_stefan2$ vtcat -p < stefan_2970_1 | vtfilter -a th=4
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-04/msg00080.html (16,984 bytes)


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