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Total 259 documents matching your query.

1. Re: LF: MF TX (score: 1)
Author: Jacek Lipkowski <>
Date: Mon, 21 Dec 2015 22:59:46 +0100 (CET)
More reports pse 474.2kHz "G3KEV MERRY XMAS" 549 in Poland. fb sigs VY 73 es Merry Christmas Jacek / SQ5BPF
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00389.html (8,405 bytes)

2. Re: LF: MF Christmas CW bacon ? (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 22 Dec 2015 21:02:10 +0100 (CET)
Beacon is on air again 474.100 474kHz is the BIA carier, sidebands are 473 and 475kHz, please move away at least 300Hz from them VY 73 Jacek / SQ5BPF
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00403.html (11,490 bytes)

3. Re: LF: digi es CW (score: 1)
Author: Jacek Lipkowski <>
Date: Fri, 25 Dec 2015 19:33:55 +0100 (CET)
DIGI MODES Fall asleep over the keyboard Go for Xmas Dinner Go down the pub and get drunk Sleep for a week Little does he know that the magical black box spawns radio waves no more! The collector cu
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00456.html (11,185 bytes)

4. LF: using a dvb-t dongle for receiving VLF/LF/MF (score: 1)
Author: Jacek Lipkowski <>
Date: Wed, 30 Dec 2015 23:34:15 +0100 (CET)
Hello I've made a small patch to use Paul's excellent vlfrx-tools with direct sampling mode on RLT2832 DVB-T dongles. This is a nice cheap option for a remote VLF/LF/MF receiver, just keep in mind th
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-12/msg00497.html (10,187 bytes)

5. Re: LF: 8270Hz/SQ5BPF (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 19 Jan 2016 15:50:30 +0100 (CET)
Hi Uwe, I've tried to decode it, but with no luck. Maybe the time synchronisation on my side is not good enough (only ntp at the moment). However after the transmission there was a long carrier (prob
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-01/msg00315.html (11,543 bytes)

6. Re: LF: Direct Upconversion from audio (score: 1)
Author: Jacek Lipkowski <>
Date: Mon, 25 Jan 2016 14:10:06 +0100 (CET)
Hello, Why not try it another way: in software upconvert the audio to 20kHz (or 40kHz if you have a 96kHz sound card), mix up to 136kHz or 472kHz and filter out the remaining sideband which is 40kHz
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-01/msg00385.html (10,509 bytes)

7. Re: LF: Direct Upconversion from audio (score: 1)
Author: Jacek Lipkowski <>
Date: Mon, 25 Jan 2016 23:02:32 +0100 (CET)
Having true baseband as an intermediate step is useful for other bands - in particular 24GHz where several types of off the shelf surplus equipment already has an image cancelling mixer, just needin
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-01/msg00397.html (12,476 bytes)

8. Re: VLF: Back on 5.17 kHz / 58 km... (score: 1)
Author: Jacek Lipkowski <>
Date: Mon, 9 Jan 2017 16:42:08 +0100 (CET)
I'm often thinking about the old VLF propagation graphs https://dl.dropboxusercontent.com/u/19882028/VLF/fig_02_25a.png (what was the original paper where it comes from?) which make more and more se
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00103.html (12,597 bytes)

9. Re: VLF: Carrier on 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 17 Jan 2017 23:29:14 +0100 (CET)
just turned on spectrum lab (hope this is not an artifact, we'll see then the signal runs for a while). this is with 357uHz fft bins. jacek Attachment: 20170117_1.png Description: PNG image
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00155.html (10,277 bytes)

10. Re: VLF: Carrier on 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Wed, 18 Jan 2017 00:44:15 +0100 (CET)
this is from 2.86mHz FFT bins. fft time only 5.8min! very good S/N jacek Attachment: 20170118_1.png Description: PNG image
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00158.html (11,862 bytes)

11. Re: VLF: Carrier on 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Wed, 18 Jan 2017 00:54:31 +0100 (CET)
ok, seems my previous results were too good to be true :) the signal is synchronized via 1pps on the other channel of the sound card and there is some crosstalk between these channels. when zooming o
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00160.html (12,095 bytes)

12. Re: VLF: Carrier on 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Wed, 18 Jan 2017 01:09:39 +0100 (CET)
Are you really sure? The signal generator is turned off? I can hardly imagine that the signal is so strong. Does the carrier disappear since 22:30 or 23 UTC? i was quite sure (until i didn't zoom out
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00161.html (12,408 bytes)

13. Re: VLF: Transmission announcement for 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 31 Jan 2017 00:22:38 +0100 (CET)
Stefan's signal in 46.3 uHz bins, 6 hours of signal starting from 20170127 20:00 UTC. QTH is Warsaw/Poland. Analysys is done using Paul's wonderful vlfrx-tools. The sound card is locked to GPS. VY 73
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00278.html (11,280 bytes)

14. Re: VLF: Transmission announcement for 8270 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 31 Jan 2017 01:10:04 +0100 (CET)
Signal at 8269.995Hz in 46.3 uHz bins, 12 hours of signal starting from 20170129 00:00 UTC. QTH is Warsaw/Poland. Not sure who's signal this is (i think Uwe's?). VY 73 Jacek / SQ5BPF Attachment: 2017
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-01/msg00279.html (11,114 bytes)

15. Re: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow by RN3AUS (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 14 Feb 2017 17:22:19 +0100 (CET)
Nice decode here for your transmission on 13 Fen 2017 20:40 found rank 0 ber 3.0469e-01 Eb/N0 10.7 M -1.697070885e+01 [XX] ps [ 0 0 0 0 0] carrier phase: 5.3 carrier Eb/N0: 10.9 carrier S/N: 21.44 dB
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00131.html (13,155 bytes)

16. Re: LF: Re[2]: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow by RN3AUS (score: 1)
Author: Jacek Lipkowski <>
Date: Thu, 16 Feb 2017 20:01:56 +0100 (CET)
Stefan Fine decode again from your 20170215 transmission: found rank 0 ber 2.6562e-01 Eb/N0 5.5 M -1.785849953e+01 [DL-RU] ps [ 0 0 0 0 0] carrier phase: 4.2 carrier Eb/N0: 4.7 carrier S/N: 19.27 dB
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00157.html (11,125 bytes)

17. Re: VLF: EbNaut also on 8270.033333 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Sat, 18 Feb 2017 20:54:40 +0100 (CET)
Yes, the whistlers are amplified in the magnetosphere by wave particle interaction. do you need any particular polarisation to couple to the magnetosphere? Bielefeld is, as usual, well placed for th
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00171.html (11,719 bytes)

18. Re: VLF: EbNaut also on 8270.033333 Hz (score: 1)
Author: Jacek Lipkowski <>
Date: Tue, 21 Feb 2017 16:11:20 +0100 (CET)
I wonder if Jacek, Eddie or Stefan might have been able to decode this one as well? Unfortunately i've had some technical problems, and couldn't record the signal, so i can't attempt a decode. Now i
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00196.html (11,431 bytes)

19. Re: VLF: New EbNaut announcement... (score: 1)
Author: Jacek Lipkowski <>
Date: Thu, 23 Feb 2017 08:23:53 +0100 (CET)
found rank 0 ber 2.5223e-01 Eb/N0 8.2 M -1.913291931e+01 [XXXXXXXX] ps [ 0 0 0 0 0] carrier phase: 0.7 carrier Eb/N0: 9.0 carrier S/N: 25.57 dB in 24.8 uHz elapsed 41 Eb/N0 is 8.2 (compared to 5.5 fo
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00202.html (13,254 bytes)

20. Re: VLF: New EbNaut announcement... (score: 1)
Author: Jacek Lipkowski <>
Date: Thu, 23 Feb 2017 10:20:16 +0100 (CET)
Last night the noise was similar to overnight 13th/14th. So yes, maybe you have gained 3dB. thanks for the anylysis Paul! i was just about to write you an email how to do it (especially how to estim
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-02/msg00205.html (12,854 bytes)


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