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1. LF: Re: WSPR and CW (score: 1)
Author: "Klaus von der Heide" <>
Date: Sat, 27 Dec 2008 23:53:18 +0100
Hello friends, my comments to the discussion WSPR vs. CW: (1) Modes only can be compared at a specified data rate. Of course, CW is "better" than every thinkable digital mode if we allow it to be slo
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00510.html (9,334 bytes)

2. Re: LF: PROPAGATION WSPR (score: 1)
Author: "Klaus von der Heide" <>
Date: Tue, 27 Jan 2009 18:59:02 +0100
Dear LF Group, we should clearly differenciate between all aspects. A propagation study does not need any information transfer via the radio path other than confidence on the identity of the station
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00953.html (12,873 bytes)

3. Re: LF: PROPAGATION WSPR (score: 1)
Author: "Klaus von der Heide" <>
Date: Wed, 28 Jan 2009 18:35:17 +0100
Hello Andy, Jim, Rik and all, yes it is just that what I wanted to point at: In a beacon mode we need not communicate information other than the confidence on the identity of the station "heard". Thr
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg01135.html (14,811 bytes)

4. Re: LF: Miles per Watt? (score: 1)
Author: "Klaus von der Heide" <>
Date: Sat, 28 Mar 2009 10:32:48 +0100
Hello Markus and all, if the reflector scatters isotropic then we have the decay of fieldstrength on the ways hence and forth which has the consequence that the received energy decays by the inverse
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-03/msg00111.html (10,418 bytes)

5. Re: LF: RX and Sound Card (score: 1)
Author: "Klaus von der Heide" <>
Date: Fri, 02 Oct 2009 13:00:51 +0200
Dear Members of the Group, since years I use a very simple method of measuring the output sample rate of the soundcard: (1) Choose an LF frequency normal such as HBG, MSF or DCF77 (2) Generate a sine
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-10/msg00345.html (9,787 bytes)

6. Re: LF: VLF THOUGHT (score: 1)
Author: "Klaus von der Heide" <>
Date: Wed, 01 Sep 2010 09:43:34 +0200
Hello All, two years ago someone disturbed my breakfast by a deeply hammering disco sound. So I took my car to search for the source. Surprisingly, the sound decreased to nearly zero when I drove som
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-09/msg00559.html (9,446 bytes)

7. LF: Re: Antennas, bandwidth, etc (score: 1)
Author: "Klaus von der Heide" <>
Date: Fri, 18 Jun 1999 09:25:11 +0200
Hello Lowfwer's Suppression of noise only works well when its behavior is known at the place where the suppression acts. A suppression of pulse type noise by a DSP will work even in the very narrow b
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-06/msg00108.html (10,146 bytes)

8. Re: LF: Transatlantic (score: 1)
Author: "Klaus von der Heide" <>
Date: Tue, 18 Jan 2000 22:15:01 +0100
A Comment on Antennas for Transatlantic QSO == 2 kilometers is a good wavelength. Then you have the chance somewhere to find some Hams living about a quarter of the wavelength apart from each other.
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00206.html (12,041 bytes)

9. LF: Transatlantic (score: 1)
Author: "Klaus von der Heide" <>
Date: Fri, 28 Jan 2000 11:28:11 +0100
Hello LF-Friends, the negative result of the recent transatlantic experiment only says that the usual ham methods for LF contacts are not adequate for a transatlantic distance. A weak signal never ex
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00322.html (12,131 bytes)

10. LF: Transatlantic (score: 1)
Author: "Klaus von der Heide" <>
Date: Tue, 1 Feb 2000 11:55:44 +0100
Hello dear LF Friends, thanks for the many and divergent replies to my post! My Mother celebrated her 90th this weekend, so I didn't have any time to give an answer immediately. Now, let me quickly t
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00004.html (13,896 bytes)

11. LF: DSP56002EVM with Atomic Clock (score: 1)
Author: "Klaus von der Heide" <>
Date: Sun, 27 Feb 2000 22:25:13 +0100
Hello LF-enthusiasts, some of you obviously use the DSP56002EVM. Therefore, let me again mention a simple method to synchronize an LF-receiver to an atomic clock. I do it the following way: The 24576
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00282.html (11,141 bytes)

12. Re: LF: PSK08 Tests / CPM (score: 1)
Author: "Klaus von der Heide" <>
Date: Sun, 27 Feb 2000 22:25:13 +0100
... <There is another modulation scheme suitable for this band that <does allow constant amplitude, and hence highly efficient class D <amplifiers. That is Continuous Phase Modulation (CPM), of which
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00283.html (11,809 bytes)

13. Re: LF: Re: Shrinking sounds - fiasco (score: 1)
Author: "Klaus von der Heide" <>
Date: Sat, 24 Jun 2000 12:23:09 +0200
If you plan to combine steps 3) and 4) by doing first decimating and then narrow band (sub-Hz) filtering, shouldn't you low pass filter the signal produced by the mixdown at 2) to have a bandwidth l
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00207.html (11,364 bytes)

14. Re: LF: PSK sidebands (score: 1)
Author: "Klaus von der Heide" <>
Date: Fri, 15 Dec 2000 13:42:28 +0100
Hello all, if PSK is done by choosing an appropriate continuous base band impulse form (raised Cosine, Gauss or Sinc) and modulating the phase at constant envelope (CPM), then the spectrum of PSK rap
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00308.html (8,210 bytes)

15. Re: LF: Re: RE PICs and DDS etc. (score: 1)
Author: "Klaus von der Heide" <>
Date: Tue, 20 Mar 2001 20:41:12 +0100
Hello Alberto, hello all, I thought again and, yes, the high order bit of the phase accumulator is not the squared up version of the sine output, but, after the phase accumulator, a DDS has a sine lo
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-03/msg00130.html (10,071 bytes)

16. Re: LF: re-long base line (score: 1)
Author: "Klaus von der Heide" <>
Date: Mon, 19 Nov 2001 22:40:14 +0100
You have heard of the proverbial sledge hammer to crack a nut, well this suggestion is like using a JCB to crack the same nut, and for what purpose. To exchange a few details like a callsign and rep
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-11/msg00277.html (9,815 bytes)

17. Re: LF: Long-Baseline Phased Arrays on LF (score: 1)
Author: "Klaus von der Heide" <>
Date: Mon, 19 Nov 2001 18:23:43 +0100
Dear all, nearly two years ago we had a discussion about Phased Arrays and Diversity on this reflector. Diversity is a method to choose the temporarily best signal from receivers that are many wavele
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-11/msg00283.html (10,754 bytes)

18. Re: LF: Re: Digital Sine Generators (score: 1)
Author: "Klaus von der Heide" <>
Date: Thu, 24 Jan 2002 11:16:44 +0100
Hello all, Thank you for your good humour and patience in answering my dumb questions. It's embarrassing for me to show my ignorance in public, but it's worth it if I learn something useful. The math
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-01/msg00117.html (13,473 bytes)

19. LF: Digital Sine Generators (score: 1)
Author: "Klaus von der Heide" <>
Date: Wed, 23 Jan 2002 11:08:39 +0100
Hello and thanks for the replies! As a lecturer, I never present all that can be said, and when posting the idea of a DDS basing on the Chinese Remainder Theorem, I hoped to get response. And it was
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-01/msg00157.html (15,366 bytes)

20. LF: Digital Sine Generators (score: 1)
Author: "Klaus von der Heide" <>
Date: Mon, 21 Jan 2002 12:06:24 +0100
Hello all in the group, If someone is interested in the following stuff, please e-mail. 73 de Klaus, DJ5HG amburg.de -- Digital Sin/Cos-Synthe
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-01/msg00202.html (12,647 bytes)


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