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1. Re: LF: 137 Carrier (score: 1)
Author: "Clifford Buttschardt" <>
Date: Fri, 26 Mar 1999 10:27:19 -0800 (PST)
If there is some way in which the PSK31 baud rate of approx 31.6 can be converted to MS25 for use with the DeCarle COHERENT program, we have the best two worlds. The narrow bandwidth of PSK31 and err
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-03/msg00188.html (9,285 bytes)

2. Re: LF: psk31 (score: 1)
Author: "Clifford Buttschardt" <>
Date: Tue, 17 Aug 1999 10:13:45 -0700 (PDT)
Excellent information John. I have just that configuration but have yet to try an installation with a newer 16 bit card. Did you find any "quirks" to avoid? Cliff K7RR Just a note that psk31 also wor
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-08/msg00114.html (8,508 bytes)

3. Re: LF: Comparison of FFTDSP4 and Specrogram 5.09 on QRS (score: 1)
Author: "Clifford Buttschardt" <>
Date: Sun, 22 Aug 1999 16:33:40 -0700 (PDT)
Alan, your note comparing the these two programs was most valuable. Even though we can not join you on 136 KHz due to a strong US Navy station here in California, there are many other times when the
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-08/msg00137.html (8,826 bytes)

4. Re: LF: re: 500khz (score: 1)
Author: "Clifford Buttschardt" <>
Date: Sat, 30 Oct 1999 18:02:14 -0700 (PDT)
Hi Finbar and the group. Your logging of the 500 KHz stations was appreciated! I too spent a great deal of time at sea listening carefully on 500 KHz and even lower frequencies on old fashioned CW. A
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00216.html (9,081 bytes)

5. Re: LF: Receivers and power-line noise (score: 1)
Author: "Clifford Buttschardt" <>
Date: Thu, 18 Nov 1999 09:46:31 -0800 (PST)
It seems that some power transformers have so little leakage reactance that they are closely coupled to the power line. First, put about 0.01 uFd directly across the transformer secondary. Then place
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00144.html (11,543 bytes)

6. Re: LF: Jim M0BMU (score: 1)
Author: "Clifford Buttschardt" <>
Date: Sun, 9 Jan 2000 17:43:40 -0800 (PST)
Sort of???? << Subj: LF: Jim M0BMU Date: 1/9/00 11:59:51 GMT Standard Time From: (Alan Melia) Sender: Reply-to: To: rs
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00079.html (8,717 bytes)

7. Re: LF: Re: Bad experience with loop ant (score: 1)
Author: "Clifford Buttschardt" <>
Date: Tue, 11 Jan 2000 13:09:02 -0800 (PST)
Heinz...To measure the distributed capacitance of any inductor, make a linear plot of resonanting capacitance on the horizontal axis and frequency on the vertical. Plot at least two resonanting frequ
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00115.html (9,987 bytes)

8. Re: LF: 137 KHz in the Western US (score: 1)
Author: "Clifford Buttschardt" <>
Date: Mon, 17 Jan 2000 17:45:24 -0800 (PST)
Bill, WB6RIJ and I built a loop antenna of channel aluminum of approximately three foot diameter of 17 turns. This was resonated on 137 KHz with about 150 pFd. A one turn coupling loop was fed to an
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00182.html (10,564 bytes)

9. Re: LF: 137 KHz Dixon, CA off! (score: 1)
Author: "Clifford Buttschardt" <>
Date: Sun, 30 Apr 2000 10:27:33 -0700 (PDT)
Bill Lake, WB6RIJ and I have checked the Naval station near Sacramento, CA and found it to be off the air for the present moment. We both thought there must be some opportunity for listening tests fr
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00345.html (8,914 bytes)

10. Re: LF: Crossing the Pacific (score: 1)
Author: "Cliff Buttschardt" <>
Date: Sun, 30 Apr 2000 21:45:04 +0000
Bob. I am sure that we could not get transmitting privileges on short notice, but we can listen while the West coast transmitter is down. Cliff K7RR Cliff K7RR, A US west coast site with a good mast
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00347.html (9,178 bytes)

11. Re: LF: Re: Noise level Measurements by OH2LX 12 May 2000 (score: 1)
Author: "Clifford Buttschardt" <>
Date: Fri, 12 May 2000 11:22:42 -0700 (PDT)
I believe most of Jupiter's emmissions are in the 20 to 25 MHz region although NASA is finding all kind of other spectra from the giant! Cliff K7RR Hi "msr" and Vdinv, Hardly, Jupiter is on the other
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00163.html (8,700 bytes)

12. Re: LF: Optimal width for LF? (score: 1)
Author: "Cliff Buttschardt" <>
Date: Mon, 15 May 2000 20:57:26 +0000
Christer and the group. I was delighted to get the two URL's containing the 30 Hz filter and noise blanker. You might remember some years ago the "HDO" phase linear filter. That was when I was W6HDO
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00209.html (10,285 bytes)

13. Re: LF: Re: LF power amplifiers (score: 1)
Author: "Cliff Buttschardt" <>
Date: Wed, 17 May 2000 00:01:02 +0000
Screw that AOL!!! John, these damn fool people out to prove that the silliest error on the part of the "subscriber" is the guy that is paying the bill. I have learned to hate that fool outfit. Us "no
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00235.html (8,683 bytes)

14. Re: LF: Re: Re: Morse tones / filters etc. (score: 1)
Author: "Clifford Buttschardt" <>
Date: Mon, 22 May 2000 11:19:38 -0700 (PDT)
Interesting observation on real time listening on LF. When I was at sea as a radio officer I arranged two receivers one vertical and the other horizontal using the longwire 500 kHz antenna tuned to t
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00343.html (10,805 bytes)

15. Re: LF: Re: Litz wire (score: 1)
Author: "Cliff Buttschardt" <>
Date: Wed, 24 May 2000 15:01:33 +0000
This works so well it is phenomenal. Burning the insulation not new but immersing the hot wire in the spirits is! 73 Cliff Buttschardt K7RR container (a [metal] bottle cap is ideal) with methylated s
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00360.html (9,922 bytes)

16. Re: LF: Optimal width for LF? (score: 1)
Author: "Clifford Buttschardt" <>
Date: Fri, 26 May 2000 10:24:50 -0700 (PDT)
Further update on the filters mentioned below. I am convinced that any filter has enough tolerance variations that experimental "tweeking" is necessary for minimum ringing. Most of us are using 800 h
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00377.html (11,300 bytes)

17. Re: LF: Copying CW (score: 1)
Author: "Clifford Buttschardt" <>
Date: Mon, 5 Jun 2000 10:12:09 -0700 (PDT)
There are chips called "bucket brigade" delay lines that will do this job easily. Radio Shack and Digi-Key here in the States would have them. I'd check MAPLEN (spelling could be wrong here!) using t
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00078.html (10,497 bytes)

18. Re: LF: keep cool (score: 1)
Author: "Clifford Buttschardt" <>
Date: Tue, 5 Dec 2000 11:09:20 -0800 (PST)
Curie point in copper? Cliff K7RR
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00473.html (8,493 bytes)

19. Re: LF: Computer as DSP audio filter (score: 1)
Author: "Clifford Buttschardt" <>
Date: Tue, 13 Nov 2001 10:20:01 -0800 (PST)
Yes, putting a set of instructions on the reflector might be a very good idea, even before the author has had a chance to edit his HELP files as was indicated on the download site. Cliff K7RR Dick, c
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-11/msg00306.html (9,829 bytes)


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