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1. Re: LF: A question of calibration (score: 1)
Author: "Dave Brown" <>
Date: Sat, 29 Sep 2007 02:31:07 +1200
It's instructive to look at plots of the variation of wave impedance with distance from the source. These plots (acknowledgements to John Middleton and Marconi Insts, "Engineers EMC Workbook") http:/
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-09/msg00138.html (16,149 bytes)

2. LF: Re: Chebyshev (score: 1)
Author: "Dave Brown" <>
Date: Tue, 30 Oct 2007 01:26:21 +1300
Not online, but download, install and run-- http://www.aade.com/filter32/download.htm 73 Dave, ZL3FJ Anyone point me to an online tool for designing LPF's for say 5 7 or 9 pole Chebyshev's on LF or H
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00004.html (9,942 bytes)

3. LF: Re: SPRAT (score: 1)
Author: "Dave Brown" <>
Date: Tue, 30 Oct 2007 07:22:29 +1300
snip-- The old F M CAMM comic of years ago Methinks you meant F J Camm Dave ZL3FJ ( No FJ bias here......)
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00031.html (8,417 bytes)

4. LF: Re: RADCOM (score: 1)
Author: "Dave Brown" <>
Date: Mon, 29 Oct 2007 07:58:40 +1300
Glad I'm not the only one still waiting!! Thought 'the colonies' QTH may have had something to do with it-- perhaps not.... Dave, ZL3FJ (member since 1968) Actually I would simply like to see a copy
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-10/msg00055.html (10,366 bytes)

5. LF: Re: LF Presentation (score: 1)
Author: "Dave Brown" <>
Date: Tue, 11 Dec 2007 15:59:24 +1300
Warren I did one at national conference a few years back- there's a thread worth following using the history of LF experimentation and use- you can take this back right to the beginnings of radio-bot
/rsgb_lf_group-archives/html/rsgb_lf_group/2007-12/msg00283.html (10,213 bytes)

6. LF: Re: Re: Looking for 500 Khz xtal unit , any freq , inside 501 504 Khz , (score: 1)
Author: "Dave Brown" <>
Date: Thu, 24 Jul 2008 09:33:32 +1200
Use one of these http://sharon.esrac.ele.tue.nl/mirrors/zl1bpu/micro/EXCITER/Index.htm to generate half the output frequency and double that -you may even get by with feeding the ~250 kHz into the st
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-07/msg00096.html (13,307 bytes)

7. Re: LF: new cw yahoo group (score: 1)
Author: "Dave Brown" <>
Date: Sun, 17 Aug 2008 23:49:20 +1200
As far as I know commercial morse services never tried to use the morse code for printing. SNIP............ Wildly OT- but in fact- machine printing morse systems predated most other variants of mach
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-08/msg00252.html (10,751 bytes)

8. LF: Re: 137.777 -779 window (score: 1)
Author: "Dave Brown" <>
Date: Mon, 2 Mar 2009 23:52:06 +1300
Nothing official yet re VK operation- they have to wait till they get the word to start using the band and it seems a long time coming. I checked on this just yesterday with Steve Olney, VK2SRO. Not
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-03/msg00511.html (9,953 bytes)

9. LF: Re: Re: 500kHz Diurnal Noise Variation (score: 1)
Author: "Dave Brown" <>
Date: Mon, 8 Jun 2009 00:07:46 +1200
Back in 1997 we temporarily activated a 400 foot ex AM broadcast mast at Kumara on the West Coast of the South Island. With an SSB signal at around 100 watts PEP into the mast, we had good LF propaga
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-06/msg00121.html (13,291 bytes)

10. LF: Re: VLF (score: 1)
Author: "Dave Brown" <>
Date: Tue, 9 Mar 2010 08:25:39 +1300
Also been considering the ground loop option but for 136kHz- I can't recall any reference to this being tried anywhere by the amateur fraternity. If it has been tried, what were the results? Another
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-03/msg00263.html (13,380 bytes)

11. LF: Re: Motorola GPS Time Oddity (score: 1)
Author: "Dave Brown" <>
Date: Sat, 3 Apr 2010 18:05:00 +1300
Andy What happens if you talk to in in binary? Same results? NMEA seems to often be almost an afterthought in some receivers and often odd things happen when using it... DaveB, NZ -- Original Message
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-04/msg00470.html (10,077 bytes)

12. LF: PA0SE (score: 1)
Author: "Dave Brown" <>
Date: Tue, 1 Jun 2010 00:38:03 +1200
What's become of Dick? Is he still with us? 73 Dave, ZL3FJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00265.html (9,399 bytes)

13. Re: LF: VLF earth antenna article in wiki (score: 1)
Author: "Dave Brown" <>
Date: Mon, 28 Jun 2010 00:59:10 +1200
Not directly relevant, given its size, but interesting for comparison purposes. ** ELF, VLF and LF radiation from a very large loop antenna with a mountain core Author: Barr, R. Ireland, W. Smith, M.
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00004.html (17,956 bytes)

14. LF: Re: VLF QRP Earth mode: 5.1km DX tonight but no such thing as a free lunch (score: 1)
Author: "Dave Brown" <>
Date: Wed, 23 Jun 2010 22:18:28 +1200
RogerAs well as pipework, there's a strong possibility for assisted signal levels from coupling into buried telephone cables. Longitudinal induced audio frequency signals can propagate literally mile
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00610.html (17,807 bytes)

15. Re: LF: audio amps for LF driver service (score: 1)
Author: "Dave Brown" <>
Date: Fri, 23 Jul 2010 21:44:45 +1200
Thanks for the replies - some useful amps noted. I'd like to find something that could be used up to 500kHz but I guess an audio amp that performs up to that frequency is likely to be a rare beast. I
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00379.html (10,440 bytes)

16. LF: audio amps for LF driver service (score: 1)
Author: "Dave Brown" <>
Date: Wed, 21 Jul 2010 22:58:30 +1200
I've seen comments here from time to time about various audio power amps being used for low power tx purposes - any suggestions as to whats a useful one for 136 up to 500 kHz at the 5 watt level or t
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00412.html (8,497 bytes)

17. LF: Sound card recommendation (score: 1)
Author: "Dave Brown" <>
Date: Tue, 7 Sep 2010 22:04:06 +1200
Looking for recommendations and/or suggestions for an external (USB preferred) sound card for use with digital modes and SDR experiments, etc. Must have line level input capability and at least two i
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-09/msg00565.html (8,999 bytes)

18. Re: LF: Any ADSL2 BBand router / RF proof ? (score: 1)
Author: "Dave Brown" <>
Date: Mon, 29 Nov 2010 22:50:54 +1300
A large common mode choke on the incoming line, just down stream towards the modem from the ETP (=NTE over there I guess) and again at the input to the modem did it for me. Using a single ADSL filter
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-11/msg00212.html (20,733 bytes)

19. LF: Re: Efficient antenna (score: 1)
Author: "Dave Brown" <>
Date: Thu, 27 May 1999 19:50:40 +1200
Petr Use the T configuration as it will most likely keep the vertical section well away from earthed surroundings, which is most important for best performance. And use at least 0.5 metre spacing bet
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-05/msg00070.html (8,399 bytes)

20. LF: Re: Noise update (score: 1)
Author: "Dave Brown" <>
Date: Mon, 7 Jun 1999 21:02:38 +1200
John- re the noise problem. Were the poles with the 'noisy' down wires actually phone line poles or power line poles? Analysis you have done so far suggests the noise is mains related and sourced so
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-06/msg00034.html (8,951 bytes)


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