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Total 218 documents matching your query.

1. LF: G4JNT Now back on LF (score: 1)
Author: "Talbot Andrew" <>
Date: Mon, 14 Feb 2000 10:46:53 +0100
Hello all. After an absence of well over a year I'm now back on LF with a rebuilt transmitter (similar to G0MRF type) and 250 Watts reliably. Antenna tested out - still OK ! - but as its only a 7m hi
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00144.html (10,478 bytes)

2. LF: Preferred freqs (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 16 Feb 2000 15:14:03 +0100
As I've been away from this reflector for a year and lost touch with the LF scene, are there preferred freqs for any mode - apart that is from sitting between Loran spurs. In other words is there a B
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00162.html (8,690 bytes)

3. LF: RE: Preferred freqs (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 16 Feb 2000 17:37:44 +0100
PSK08 is a modification to the PSK31 data waveform, now very popular on HF, but operating at a quarter of the signalling rate, ie. 7.8 Bits/s. I modified G3PLX's software for the Motorola 56002EVM bo
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00164.html (9,649 bytes)

4. LF: PSK08 Tests (score: 1)
Author: "Talbot Andrew" <>
Date: Fri, 25 Feb 2000 15:02:24 +0100
Now I know a few copies of PSK08 are out there I'll transmit this evening around 2000z. Frequency will be 137.500 +/- 0.5 Hz, chosen after careful consulation with this group :-|) Probably won't list
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00243.html (9,703 bytes)

5. LF: High voltage reed relays (score: 1)
Author: "Talbot Andrew" <>
Date: Mon, 20 Mar 2000 11:29:05 +0100
I have a number of, quote, "High Voltage" reed relays. They were made by FR Electronics (as was) and I seem to recall are specified to something like 10kV and 1 Amp which means they may well work hig
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00175.html (9,014 bytes)

6. LF: HV Reed relays (score: 1)
Author: "Talbot Andrew" <>
Date: Tue, 21 Mar 2000 09:53:22 +0100
Managed to find six spare reed relays that look as if they may be suitable for LF antenna switching . The reed connection points are well separated from the coil connections by about 10mm in air with
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00192.html (8,860 bytes)

7. LF: RE: MSF (6O kHz) and DCF77 (77.5 kHz) (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 22 Mar 2000 10:06:29 +0100
MSF Rugby is at 52.36081 Deg N 1.17756 Deg E -- From: John Rabson[SMTP:] Reply To: Sent: 2000-03-21 22:23 To: Subjec
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00206.html (9,284 bytes)

8. LF: Automatic attachments (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 22 Mar 2000 14:26:54 +0100
A few people have commented to me about the annoying attachment that appears at the end of messages from this account. Some are even woried about its implications to themselves ! It is placed there b
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00210.html (8,897 bytes)

9. LF: RE: VLF Questions (score: 1)
Author: "Talbot Andrew" <>
Date: Thu, 6 Apr 2000 10:46:55 +0100
I am particularly interested in these low frequencies, especially as 137 and 73 have become just DXCC and CW operators bands. I was considering applying to our licensing agency for a narrow allocatio
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00069.html (9,062 bytes)

10. LF: RE: TransAtlantic II (score: 1)
Author: "Talbot Andrew" <>
Date: Mon, 10 Apr 2000 11:32:04 +0100
It would be unfortunate to limit ourselves to just use of these two relatively simple pieces of DSP software which at the end of the day are really just narrowband power detectors in not that narrow
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00109.html (10,971 bytes)

11. LF: Coil winding conundrum (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 12 Apr 2000 13:48:41 +0100
Moving from LF to MF for a bit, here's a problem for the topband operators and loading coil winders. At the weekend I made a loading coil to resonate the LF Tee antenna on topband. 34uH was needed an
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00124.html (10,986 bytes)

12. LF: Coil winding conumdrum (score: 1)
Author: "Talbot Andrew" <>
Date: Thu, 13 Apr 2000 09:39:30 +0100
Well, Gamal and Paul between them hit on the solution. It definitely appears to be proximity effect causing extra losses for the Litz wound coil. I re-measured both at 80kHz and the Litz one came out
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00149.html (10,561 bytes)

13. LF: DSP Experimentation, Antenna book etc. (score: 1)
Author: "Talbot Andrew" <>
Date: Fri, 14 Apr 2000 12:16:39 +0100
If anyone wants to experiment with simple DSP techniques beyong just plugging in Gram etc, or even wants to try some programming without having to learn Windows API calls and how to use the soundcard
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00173.html (12,684 bytes)

14. LF: RE: Spectran, Spectrogram and extreme QRS - a test ?This mail is UNCLASSIFIED (score: 1)
Author: "Talbot Andrew" <>
Date: Mon, 17 Apr 2000 12:16:33 +0100
I have not played with Spectran yet, but on the question of dot length...... The optimum dot will depend on the FFT and integration time of the software. Ideally the dot length will be a multiple of
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00235.html (10,932 bytes)

15. RE: LF: Wishing for key clicks (score: 1)
Author: "Talbot Andrew" <>
Date: Tue, 18 Apr 2000 08:16:50 +0100
Don't joke ! I have seen a genuine proposal / request for licence (and it was not an April fool) for a spread spectrum radio system that transmits data as very fast short pulses over a wide band to r
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00243.html (9,413 bytes)

16. LF: Re last message (score: 1)
Author: "Talbot Andrew" <>
Date: Thu, 20 Apr 2000 08:49:22 +0100
Andy G4JNT -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclo
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00260.html (7,992 bytes)

17. LF: LF Dopplergrams (score: 1)
Author: "Talbot Andrew" <>
Date: Thu, 20 Apr 2000 11:25:34 +0100
Last night I tried to make a Dopplergram trace of a carrier transmitted from Marco in a bandwidth of 0.12 Hz. On looking at the plot this morning I'm not too sure what to make of it an whether the re
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00261.html (9,181 bytes)

18. RE: LF: Carrier on 137.7446 (score: 1)
Author: "Talbot Andrew" <>
Date: Tue, 25 Apr 2000 11:33:55 +0100
I got the impression that carrier has only appeared recently - withn the last couple of months anyway, but my memory is probably fading with age ! I spotted it since It was sitting only a few 10s of
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00295.html (10,719 bytes)

19. LF: Transatlantic beacon tests (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 26 Apr 2000 12:45:14 +0100
I was receiving Marco's carrier during the night tests at 20 - 30dB above noise in a 2mHz bandwidth at a distance of 927km. Daytime was 10 - 15dB lower. In a Spectran bandwidth of 0.03 Hz that will c
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00306.html (11,998 bytes)

20. RE: LF: Transatlantic beacon tests (score: 1)
Author: "Talbot Andrew" <>
Date: Wed, 26 Apr 2000 16:36:15 +0100
I think most modern transceivers derive all their internal frequencies from one master oscillator. The IC746 uses a 30 MHz device which at extra cost can be replaced by a small 1-2ppm ovenned oscilla
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00309.html (11,736 bytes)


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