Re: LF: Re: Sub-9kHz walkabout tests

[Roger Lapthorn <rogerlapthorn@gmail.com>]

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 £20 for ratings up to 160VA.  They are available up to at least 1kVA, but get expensive.

What is the best former material to use to wind your own tapped step-up transformer for this sort of application and where can you get it?

73s
Roger G3XBM

On 11 May 2010 13:52, Horst Stöcker <horst.stoecker@web.de> wrote:

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 had blown my audio-transformer I changed to a troroidal transformer for 220/15V.

Horst DO1KHS/DI2AN

-----Ursprüngliche Nachricht-----
Von: John Bruce McCreath <weazle@hurontel.on.ca>
Gesendet: 11.05.2010 14:33:08
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: Re: Sub-9kHz walkabout tests

>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 output (as used in stores, offices, etc) as a
>means of delivering some power into a pair of ground rods?
>
>73, J.B., VE3EAR
>
>LowFER Beacon "EAR"
>188.830 kHz. QRSS30
>
>
>
>
>
>

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