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1. LF: Re: RE: PSK experiments (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 20 Dec 2000 13:22:05 +0100
Hi all, Cool Edit can be used to generate white noise and mix it with your test signal at a desired S/N. Or you can record "real" noise off the air and mix it in desired ratio with signal. And it can
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00222.html (9,617 bytes)

2. LF: Re: amplifier design (score: 1)
Author: "Stewart Nelson" <>
Date: Sun, 10 Dec 2000 15:26:31 +0100
Hi Mal and all, While it would be great if we all had linear amplifiers, I believe that most modes of interest can be accommodated with a switching amp. Of course, CW, RTTY, and all forms of FM and F
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00370.html (11,642 bytes)

3. LF: Detection of QRSS ("LEK" raw data) (score: 1)
Author: "Stewart Nelson" <>
Date: Sun, 10 Dec 2000 13:36:56 +0100
Hi Bill, Lyle, and all, I have been looking at this signal to see how it might be received if it were 20 dB weaker (please don't laugh). IMO, coherent detection would be a big step toward that goal,
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00374.html (14,211 bytes)

4. LF: Re: [Lowfer] LEK's QRSS-CW signal copied in Canada using CRUNCH (score: 1)
Author: "Stewart Nelson" <>
Date: Thu, 7 Dec 2000 15:12:35 +0100
Hi Bill and all, Thanks for the CRUNCHed file. I took a close look at it, to see how well a machine might decode it. First, I found the spectral peak at about 799.875 Hz. This is amazing Tx and Rx fr
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00432.html (13,292 bytes)

5. LF: Virus posted here (was Re: G4CNN QRSS) (score: 1)
Author: "Stewart Nelson" <>
Date: Fri, 1 Dec 2000 17:18:45 +0100
Hi Bill and all, If you have not yet opened today's message from William Staples, don't - it has the VBS.KakWorm virus attached. If you have already opened it and didn't get an error message, you may
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00511.html (9,249 bytes)

6. LF: Proposed new LF signal format (score: 1)
Author: "Stewart Nelson" <>
Date: Sat, 27 Jan 2001 06:53:46 -0800
I believe that, by using a signal format designed specifically for LF weak-signal operation, it should be possible to communicate at S/N values at least 10 dB below what is typically needed for QRSS.
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00144.html (13,676 bytes)

7. LF: Re: wolf and inputpwr (score: 1)
Author: "Stewart Nelson" <>
Date: Sat, 24 Mar 2001 12:55:45 -0800
Hi Uwe and all, The present implementation of WOLF, unfortunately, has very poor dynamic range. The BPSK signal must be between -20 dB and -50 dB, relative to full scale. If you are receiving your ow
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00059.html (11,335 bytes)

8. LF: Re: Re: WOLF - Transmit (score: 1)
Author: "Stewart Nelson" <>
Date: Fri, 23 Mar 2001 11:06:56 -0800
Hi Andy and all, In my implementation, the code which uses pnpat is intertwined with modulation, etc., so I didn't include it. Sorry. The output of enccnv is an array 480 long, as is pnpat. You trans
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00066.html (9,158 bytes)

9. LF: Re: RE: Re: WOLF - Transmit? (score: 1)
Author: "Stewart Nelson" <>
Date: Thu, 22 Mar 2001 09:23:41 -0800
Hi Andy and all, Sorry that I don't have a good document on the format, but here is the code used to generate it; I hope that it is enough info for you to build something compatible with WOLF. You ca
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00082.html (12,413 bytes)

10. LF: Re: WOLF - Transmit? (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 21 Mar 2001 23:50:35 -0800
Hi Mike and all, Bill de Carle VE2IQ has added WOLF mode to his KEYER package. Can upload to keyer or provide data for an EPROM, etc. Download from Bill's web page at http://cafe.rapidus.net/bill1/bb
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00087.html (10,213 bytes)

11. LF: Re: WOLF (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 21 Mar 2001 01:25:06 -0800
Hi Rik and all, I think that this bug has been fixed, but I failed to post to the LF group. My apologies. If 0.52 doesn't fix the problem for you, please tell me what program you are using to record,
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00114.html (9,713 bytes)

12. LF: Re: Loran DX (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 21 Mar 2001 00:19:41 -0800
Hi Markus and all, I'm quite interested in this idea; perhaps we can work together to develop the code. We might call it the LAMP (Loran Analysis for Monitoring Propagation), but other suggestions ar
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00118.html (15,281 bytes)

13. LF: Re: Re: WOLF BPSK (score: 1)
Author: "Stewart Nelson" <>
Date: Tue, 20 Mar 2001 17:08:25 -0800
Hi Peter, It appears that Rik solved this problem, but if you're still having trouble, please let me know and I'll try to help. 73, Stewart KK7KA
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00122.html (8,996 bytes)

14. LF: Re: Success and failure (score: 1)
Author: "Stewart Nelson" <>
Date: Tue, 20 Mar 2001 17:06:23 -0800
Hi Mike, If you're still having trouble with Jim's WOLF signal, please email me a one minute .wav file, and I try to diagnose the problem. You can convert it to 8-bit samples to save some space, if y
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00123.html (12,016 bytes)

15. LF: Re: Re: WOLF BPSK tests tonight (score: 1)
Author: "Stewart Nelson" <>
Date: Mon, 19 Mar 2001 18:37:59 -0800
Hi Peter, I don't have Win98 myself, but several users have run WOLF under Win98 with no trouble. Please send me the failing console output, or tell me what OS error message you are getting, and I'll
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00160.html (9,849 bytes)

16. LF: Re: Re: [TECH] WOLF, FDK, AFK, etc. (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 18 Apr 2001 18:59:54 +0200
Hi Steve and all, FDK is only similar to BPSK in terms of a possible way it can be generated. Its spectrum over a 60 second epoch (the initial character duration for now) looks identical to a two ton
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-04/msg00122.html (13,523 bytes)

17. Re: LF: WOLF test results, soundcard trouble (score: 1)
Author: "Stewart Nelson" <>
Date: Wed, 18 Apr 2001 14:06:49 +0200
Hi all, Thanks for the interesting posts on frequency errors in sound cards and drivers. It appears that WOLF should use 11025 Hz, rather than 8000 Hz, as its standard sample rate. Upsampling or down
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-04/msg00124.html (10,525 bytes)

18. Re: LF: WOLF bandwidth suggestions (score: 1)
Author: "Stewart Nelson" <>
Date: Tue, 17 Apr 2001 11:37:36 +0200
Hi Rik and all, The real loss is indeed worse than 0.8 dB, but is extremely unlikely to come anywhere near 3 dB. That's because the message data is interleaved with a pseudo-random stream which is kn
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-04/msg00136.html (10,732 bytes)

19. LF: [TECH] WOLF, FDK, AFK, etc. (score: 1)
Author: "Stewart Nelson" <>
Date: Mon, 16 Apr 2001 16:41:41 +0200
Hi Steve and all, Sorry that some statements on my WOLF page might be misleading. Speaking about "multitone FSK", I meant COFDM (coded orthogonal frequency division multiplexing), and similar systems
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-04/msg00155.html (13,578 bytes)

20. LF: Re: WOLF bandwidth suggestions (score: 1)
Author: "Stewart Nelson" <>
Date: Sun, 15 Apr 2001 01:25:13 +0200
Hi Markus and all, Thanks for your post. I've fixed some of the minor problems, and have comments on the major ones. WOLF new version is 0.53, which can be downloaded at http://www.scgroup.com/ham/wo
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-04/msg00183.html (16,339 bytes)


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