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Total 686 documents matching your query.

1. LF: RX Problems (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Sun, 31 Oct 1999 14:12:04 +0100
Can anyone help? WRT Racal RA1792 filters - my rx seems very wide. Is Plessey PRS2282 more suitable for 136? 73, Laurie G3AQC
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00218.html (7,716 bytes)

2. LF: Date: Wed, 3 Nov 1999 12:06:35 -0000 (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Wed, 03 Nov 1999 12:07:02 +0000
From Laurie G3AQC Just put 3 top wires on my Marconi T antenna instead of only one.No increase in antenna current,although I did have to re-tune to compensate for extra capacity.will just have to try
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00014.html (8,078 bytes)

3. LF: re.Ropex Mods J.M.Valstar (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Tue, 16 Nov 1999 23:35:44 +0100
If 4060 used as Xtal oscillator/divider you could replace xtal with tuned circuit.I use this in my exciter and it is quite stable.73 laurie G3AQC.
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00113.html (7,768 bytes)

4. LF: radials/counterpoises etc. (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Wed, 17 Nov 1999 17:21:20 +0100
Radial=Counterpoise,usually several radials required if buried up to 120! but only one counterpoise so to be effective it has to be resonated-if short add inductance,could use ant tuning coil as sugg
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00129.html (8,293 bytes)

5. LF: Radial / Counterpoise systems (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Fri, 19 Nov 1999 20:48:01 +0100
Re. the ongoing discussion about radials etc. I once saw a 500 Khz installation which used a marconi "T" ant. with 3 top wires.Below was a counterpoise earth system which consisted of about 10 spaced
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00155.html (8,587 bytes)

6. LF: Interferance (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Sun, 21 Nov 1999 12:07:10 +0100
I have much trouble with a source of interferance centered on 98/99Khz.this appears to be a digital/data sort of transmission which spreads as far as 145Khz and which results in a high background noi
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00165.html (8,278 bytes)

7. LF: B&K Audio Amps (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Sun, 21 Nov 1999 12:24:19 +0100
I am using a B&K Audio amp as a power amp on 136.But it runs out of steam rapidly beyond 100Khz.I can only get about 100W! Are there any mods etc to get more from this amp,or should I start again and
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00166.html (7,928 bytes)

8. LF: BK Amp (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Tue, 23 Nov 1999 21:15:14 +0100
Thanks to Mike G3XDV and Lech G3KAU for advice re BK Amp.I now get 300 w after changing nfb components.Will have to change OP Tx as it now gets hot! 73 Laurie G3AQC.
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00196.html (7,647 bytes)

9. LF: Directional Ants for 136. (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Thu, 25 Nov 1999 18:24:23 +0100
I am plagued here on the coast by the Loran station on 100Khz located in northen France .The path to my QTH is mainly over water so sigs very strong even in our band. I needed to reduce the strength
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00212.html (9,185 bytes)

10. LF: Re DL3FDO (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Thu, 25 Nov 1999 23:22:20 +0100
Hrd CQ de DL3FDO rst 3/4/9 at 2145 on 136.54 QSX 1863 but sri not QRV on 160! try 80! 73 Laurie.
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-11/msg00216.html (7,696 bytes)

11. LF: DK7KOHeard (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Tue, 07 Dec 1999 13:54:24 +0100
Heard Vs de DK7KO Test at 1150 today strength 3/4/9 73s Laurie.
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00015.html (7,627 bytes)

12. LF: Re.LF tests 5th December 1999. (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Wed, 08 Dec 1999 23:14:09 +0100
No recent changes to my TX ant but xmit pwr increased to 250/300 Watts fron 29/11/99.So possibility is that any increase in sig strength due to this.Unfortunately my Rx ant was faulty, so recieved si
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00018.html (8,663 bytes)

13. LF: Re. Insulators (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Thu, 09 Dec 1999 19:32:52 +0100
Tom, I bought some nice ribbed ceramic insulator from a Tandy store about 2 years ago.But havnt seen any since.I think they were a Tandy stock item and so must be available,just that most stores dont
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00024.html (7,876 bytes)

14. LF: Insulators (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Sat, 11 Dec 1999 21:32:08 +0100
Re. Insulators, it ought to be possible to check plastic by the same means as used for coil formers.Put a sample of the plastic in the microwave with a cup of water.Run for a minute or two, water sho
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00039.html (7,905 bytes)

15. LF: Re.LF 162Khz field strength. (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Fri, 17 Dec 1999 16:33:17 +0100
The report by Andre Kesteloot on 15/12/99 re LF propagation prompted me to read some old IEE journals of the late 1940s when there was much intrest in VLF.There are an enormous number of refs and I h
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00082.html (9,652 bytes)

16. LF: Re.QRS and Spectrogram. (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Fri, 17 Dec 1999 18:39:37 +0100
I should like to look at some slow CW transmissions.I have access to a gram program which I think is spectrogram.dll by R.Horne.But I dont think it is suitable for slow CW.I have tried to download sp
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00084.html (8,432 bytes)

17. LF: Re Spectrogram (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Sun, 19 Dec 1999 12:10:11 +0100
Many thanks to all who replied to my "gram" enquiry.I am still suffering from this Flu. bug so dont feel much like working on the computer or radio.Will try to sort it out when I feel better,thanks.7
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00093.html (7,742 bytes)

18. LF: QRSS (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Tue, 21 Dec 1999 17:28:23 +0100
Thanks to all who sent me advice re spectrogram.I have now solved the problem and of course it turns out to be "finger trouble",but all the information and advice was most valuable. I shall now be lo
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00106.html (9,093 bytes)

19. LF: Andre.Re. LF QRSS (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Wed, 22 Dec 1999 12:04:10 +0100
Thanks Andre for your message re. spectrogram.All the advice I recieved was on this reflector,so I assume you have access.If not please let me know. Merry xmas and 73s Laurie.
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00115.html (7,729 bytes)

20. LF: Re: CQ LFCC (score: 1)
Author: "LAWRENCE MAYHEAD" <>
Date: Fri, 24 Dec 1999 22:45:45 +0100
Hello, The deadline for your comments about the new CQ Low Frequency Countries Certificate (LFCC) is on Monday 27 December 1999. After that date, the rules will be published in all appropriate bulle
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00128.html (8,504 bytes)


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