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Total 5 documents matching your query.

1. Re: LF: Re: Sub-9kHz walkabout tests (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Tue, 11 May 2010 15:55:10 +0100; There are several sources in the UK for toroidal mains transformers with various step-down ratios. See for example http://www.airlinktransformers.com/toroidal-transformers.asp . These sell for £12 to; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00099.html (14,618 bytes)
2. Re: LF: Re: Sub-9kHz walkabout tests (score: 1): Author: John Bruce McCreath <[email protected]>; Date: Tue, 11 May 2010 08:33:08 -0400; Hello LFers, I'm finding the posts related to the "dreamers band" quite interesting and it's nice to read of the various methods that are being tried. Has anyone used a PA amplifier with a 70 volt ou; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00150.html (10,386 bytes)
3. LF: Re: Sub-9kHz walkabout tests (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Tue, 11 May 2010 12:22:33 +0100; I'm intrigued by what mode the signal is propagating: the loop orientation for best reception clearly indicates induction, so I guess the TX end grounded electrodes and the feed wire (about 1-2m in t; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00174.html (14,945 bytes)
4. Re: LF: Re: Sub-9kHz walkabout tests (score: 1): Author: Horst Stöcker <[email protected]>; Date: Tue, 11 May 2010 14:52:57 +0200 (CEST); Hello J. B. in the wellknown standard work of John Tailor G0AKN exactly this is the method. He used a 70V transformer. And I started with an autio-transformer. too. Here the standard is 100V. After I; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00311.html (11,911 bytes)
5. LF: Re: Sub-9kHz walkabout tests (score: 1): Author: "Dave Sergeant" <[email protected]>; Date: Tue, 11 May 2010 16:58:11 +0100; Not sure that mains transformers are appropriate for 9kHz. Probably better would be switch mode psu transformers (normally operate 25kHz75kHz) and you could probably design what you wanted with readi; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00452.html (11,303 bytes)

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