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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*VLF\:\s+Back\s+on\s+5\.17\s+kHz\s+\/\s+58\s+km\.\.\.\s*$/: 53 ]

Total 53 documents matching your query.

1. VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Tue, 27 Dec 2016 12:36:57 +0100
Hi VLF, It's time to come back to 5.17 kHz where i have been in the last kite experiments 2010/2011. The best result was about 10 dB in 3.8 mHz in 904 km distance, detected by SQ5BPF. His website abo
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00336.html (10,794 bytes)

2. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Fri, 30 Dec 2016 17:24:59 +0100
Hi VLF, I managed to resonate my antenna on 5170 Hz. It was necessary to increase the inductance from 1.2 H to 2 H. This was done by increasing the number of iron powder cores (T106-52) from 100 to 1
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00381.html (13,352 bytes)

3. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Fri, 30 Dec 2016 18:57:08 +0000
So far 12.1dB in 93uHz, -62.2dB in 2.5kHz, quite a decent signal. With that signal, I expect an easy decode at about Eb/N0 = 4.5dB. I cannot work out exactly where your antenna wire runs to so unabl
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00382.html (9,959 bytes)

4. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Markus Vester <>
Date: Fri, 30 Dec 2016 20:07:17 -0500
Hi Stefan, during the last hours a good peak apperared here, around 13 dB in 63 uHz. If this is really your carrier (and not just a local GPS harmonic), tomorrow's EbNaut sequence should become an ea
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00387.html (14,800 bytes)

5. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Sat, 31 Dec 2016 13:54:13 +0100
Hi Markus, Paul, VLF, Markus that looks great! Also the good SNR report from Paul made me most excited. It was uncertain which propagation has to be expected on 58km but from the first impressions it
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00395.html (17,523 bytes)

6. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Sat, 31 Dec 2016 16:41:13 +0000
Copied '58' with Eb/N0 = 4.5 dB, constant reference phase. S/N: 15.06 dB in 45.3 uHz, -62.4 dB in 2.5kHz. -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00402.html (9,945 bytes)

7. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Sun, 01 Jan 2017 16:17:24 +0100
Hello Paul, VLF, My congrats, the message is correct! :-) The first EbNaut on 5170 Hz!!! I did not stop transmitting since friday afternoon (unfortunately this makes my LF grabber unusable). So maybe
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00008.html (11,458 bytes)

8. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Sun, 1 Jan 2017 16:00:36 +0000
Distance 504.6km to Renato Romero's online receiver 'vlf15' at Cumiana via http://abelian.org/vlf Easy decode from the recording of vlf15 (this is after a stage of vorbis compression and decompressio
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00009.html (11,473 bytes)

9. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Sun, 1 Jan 2017 16:15:58 +0000
Copied '517' in Cumiana too: List rank: 1867, symbol error rate 43.75%, constant reference phase. Carrier Eb/N0: 0.3 dB Carrier S/N: 12.62 dB in 53.9 uHz, -64.0 dB in 2.5kHz. -- Paul Nicholson --
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00010.html (10,894 bytes)

10. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Markus Vester <>
Date: Sun, 1 Jan 2017 14:04:33 -0500
I did not stop transmitting since friday afternoon (unfortunately this makes my LF grabber unusable). So maybe you got some first informations about propagation on 58km? It seems to be a promising ba
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00011.html (13,882 bytes)

11. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Mon, 02 Jan 2017 10:19:18 +0100
Hi Paul, VLF, Many thanks for the decode and analysis of Renatos data! Well, 517 is correct of course. But HNY would have been the better choice for a message. But i just woke up 4 minutes before 9 U
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00021.html (12,673 bytes)

12. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Mon, 02 Jan 2017 12:17:55 +0100
Hi Paul, Am 30.12.2016 19:57, schrieb Paul Nicholson: I cannot work out exactly where your antenna wire runs to so unable to try calculations. I can see where one end is on the IUP building, but not
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00022.html (10,549 bytes)

13. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Mon, 2 Jan 2017 15:56:39 +0000
Stefan wrote (28th Dec): Stefan wrote (2nd Jan): Thanks. From Google it looks like the wire length is 53m. I put the significant buildings into LCnetgen and it gives antenna capacitance 402pF with 12
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00029.html (11,063 bytes)

14. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Mon, 2 Jan 2017 16:20:20 +0000
Could be. No such problems here due to using LP smoothed pulse for centroid measurement. Needs about 15.9 Gbyte RAM when using the optimum list length of 62k. Would be a silly amount of memory except
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00030.html (11,452 bytes)

15. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: DK7FC <>
Date: Mon, 02 Jan 2017 18:12:37 +0100
Let's try further challenges on 5.17 kHz. A first night transmission: f = 5170.000000 Hz Start time: 02.Jan.2017   17:00:00 UTC Symbol length: 40 s Characters: 5 CRC 16 Coding 16K25A Duration: 12h, 2
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00033.html (10,863 bytes)

16. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Mon, 2 Jan 2017 19:19:33 +0000
Looks good. Last night the carrier 2017-01-01_17:00,+44800 at 5169.99975 Hz measured 0.135 fT but the signal is spread across 70uHz for some reason. It may decode at Eb/N0 between 3 to 5dB, hard to s
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00035.html (12,545 bytes)

17. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Markus Vester <>
Date: Mon, 2 Jan 2017 14:50:37 -0500
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00036.html (12,602 bytes)

18. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Markus Vester <>
Date: Mon, 2 Jan 2017 15:00:36 -0500
Thanks Stefan. But I'm afraid it won't work: There was absolutely no hint of your offset carrier in my 63 uHz spectrogram, and also not in another one with 31 uHz bins. Perhaps I was too optimistic a
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00037.html (11,248 bytes)

19. RE: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: <>
Date: Mon, 2 Jan 2017 15:21:58 -0500
Paul and Stefan, Nice work, including parameters and modeling. Was the LWPC TX antenna angle parameter fairly close to actual angle? 73, Jim AA5BW Looks good. Last night the carrier 2017-01-01_17:00,
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00038.html (13,187 bytes)

20. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Paul Nicholson <>
Date: Tue, 3 Jan 2017 08:07:09 +0000
Received 'HELLO', BER 41.1%, constant reference phase. Carrier Eb/N0 = +1.0 dB, S/N: 15.57 dB in 22.3 uHz, A little weaker than expected. S/N -64.9dB in 2.5kHz after sferic blanking. Before the blank
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00044.html (12,726 bytes)


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