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1. Re: LF: Directional Ants for 136. (score: 1)
Author: "M.J.Powell" <>
Date: Thu, 25 Nov 1999 20:00:55 +0000
Why don't you try a loop plus a short vertical to get a cardioid which has only one null? Mike G3IJE -- M.J.Powell
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00215.html (8,227 bytes)

2. Re: LF: Re: Bad experience with loop ant (score: 1)
Author: "M.J.Powell" <>
Date: Tue, 11 Jan 2000 20:57:49 +0000
....After realizing my loop I found out, that the capacity of the loop itself between the turns was already 800pF. That generates losses. Do you know that capacity in your loop? How can one measure
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00116.html (10,078 bytes)

3. Re: LF: Re: Big LF Antennas (score: 1)
Author: "M.J.Powell" <>
Date: Wed, 19 Jan 2000 12:09:09 +0000
<< What is the name of that game, may I join in? ;-) Vy 73 Geri, DK8KW (W1KW, ex: AA5SV, C31JE, F0BEG, G5BXG, JY8KW, OK8AHC, OM9AKW, etc. etc. etc. What !!!! No VO1/DK8KW ?? Is that G3IJE above? Oh n
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00224.html (9,252 bytes)

4. Re: LF: Re: Transatlantic (score: 1)
Author: "M.J.Powell" <>
Date: Fri, 28 Jan 2000 11:35:33 +0000
Would amateurs be allowed to relay the one second pips from time-signal stations? That should be synchronous across the pond. The receiving station could phase shift their local T/S pips to correspon
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00328.html (10,675 bytes)

5. Re: LF: Re: 8 kHz loading coil (score: 1)
Author: "M.J.Powell" <>
Date: Sun, 30 Jan 2000 13:40:52 +0000
With the figures you give I estimate you will be getting about 100 KV across the inductor. An air-cored coil , of substantial size, would seem to be the best way of doing things. By the way, in the e
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00350.html (9,720 bytes)

6. Re: LF: 73kHz Today (score: 1)
Author: "M.J.Powell" <>
Date: Tue, 1 Feb 2000 19:53:06 +0000
I would guess that the sidebands are due to power supply ripple, and that when FSK modulation is on, all the sidebands get modulated too. Since the data is probably not syncronised with the mains, th
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00020.html (9,385 bytes)

7. Re: LF: dxpedition (score: 1)
Author: "M.J.Powell" <>
Date: Wed, 9 Feb 2000 19:47:37 +0000
In message <>, g3kev <> writes Hi All. Was planning to operated from Cookstown/Tyrone (GI) this weekend but because of the gales foreca
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00109.html (10,079 bytes)

8. Re: LF: One Week Later, and more.... (score: 1)
Author: "M.J.Powell" <>
Date: Sat, 19 Feb 2000 11:52:58 +0000
snip I do not know how to interpret these flare warning messages. Easy way to remember: 'C's are small events and don't do much. 'M's are medium and cause some SW effects. 'X's are Biggies and can pl
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00188.html (9,291 bytes)

9. Re: LF: One Week Later, and more.... (score: 1)
Author: "M.J.Powell" <>
Date: Sun, 20 Feb 2000 13:22:02 +0000
Easy way to remember: 'C's are small events and don't do much. 'M's are medium and cause some SW effects. 'X's are Biggies and can play the devil. I can recommend the IPS service which I've subscrib
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00195.html (9,904 bytes)

10. Re: LF: Re: Re: 136kHz weak signals (score: 1)
Author: "M.J.Powell" <>
Date: Sat, 26 Feb 2000 11:38:09 +0000
... I noticed another weak signal had been recorded at around 137.740kHz. It turned out to be sending the same data as GM3YXM/P but with a mystery delay timing difference of around three seconds. Non
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00264.html (9,810 bytes)

11. Re: LF: Re: date error (score: 1)
Author: "M.J.Powell" <>
Date: Sun, 27 Feb 2000 13:16:09 +0000
I wasn't getting at you! Mike G3IJE -- M.J.Powell
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00276.html (8,383 bytes)

12. Re: LF: QRSS (score: 1)
Author: "M.J.Powell" <>
Date: Tue, 28 Mar 2000 11:08:41 +0100
snip A vertical antenna takes up less than 1 metre square of space and could have unlimited height. I live under Ringway flight path! Mike -- M.J.Powell
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00274.html (9,501 bytes)

13. Re: LF: 73kHz - Rugby (score: 1)
Author: "M.J.Powell" <>
Date: Thu, 30 Mar 2000 23:43:28 +0100
In message <>, Andy Talbot <> writes MSF has been off as well, just as I wanted to do some long duration frequency calibration tests,
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00311.html (9,294 bytes)

14. Re: LF: Wishing for key clicks (score: 1)
Author: "M.J.Powell" <>
Date: Mon, 17 Apr 2000 12:42:35 +0100
Another weekend gone and no key clicks here either. It seems that all I want for Christmas is some key clicks. Make my day, send me some key clocks, one for the start of every dit, another for the en
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00238.html (9,334 bytes)

15. Re: LF: Wishing for key clicks (score: 1)
Author: "M.J.Powell" <>
Date: Tue, 18 Apr 2000 12:26:47 +0100
Mike Hello Mike, You would have an enormous peak power, but unfortunately also an enormous bandwidth. So after all the signal-to-noise ratio would not improve. What a pity. Another good idea down the
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00247.html (9,725 bytes)

16. Re: LF: Re: Re: Morse tones / filters etc. (score: 1)
Author: "M.J.Powell" <>
Date: Mon, 22 May 2000 23:04:55 +0100
In message <>, Clifford Buttschardt <> writes Interesting observation on real time listening on LF. When I was at sea as a r
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-05/msg00349.html (10,474 bytes)

17. Re: LF: Re: Aerial tests. (score: 1)
Author: "M.J.Powell" <>
Date: Fri, 2 Jun 2000 16:08:39 +0100
Walter Blanchard quoted the RACAL expert who has in the past designed the Decca antennas as follows: (...) If the small one has an assymetric horizontal component (flat-top) this will complicate matt
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00032.html (10,877 bytes)

18. Re: LF: Re: Aerial tests. (score: 1)
Author: "M.J.Powell" <>
Date: Sun, 4 Jun 2000 13:43:08 +0100
over Mike Powell commented: And yet did not Marconi use a vertical antenna with a long horizontal wire to obtain directivity from Cape Race? When the original aerials came down in a gale he found eq
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00062.html (10,837 bytes)

19. Re: LF: Copying CW (score: 1)
Author: "M.J.Powell" <>
Date: Mon, 5 Jun 2000 20:46:21 +0100
In message <>, Mike Dennison <> writes I have been playing around with feeding differently derived audio into the two halves of stereo head
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00081.html (10,179 bytes)

20. Re: LF: Re: Copying CW (score: 1)
Author: "M.J.Powell" <>
Date: Tue, 6 Jun 2000 15:57:31 +0100
In message <>, Mike Dennison <> writes Dick, PA0SE wrote: I have tested "pseudo-stereophonic" reception of CW by feeding the halves of a st
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00086.html (11,463 bytes)


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