Re: LF: VLF in Canada

To:	"[email protected]" <[email protected]>
Subject:	Re: LF: VLF in Canada
From:	Roger Lapthorn <[email protected]>
Date:	Mon, 23 Jun 2014 21:35:05 +0100
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Joe,

Alternatives are a large TX loop or even a large earth-electrode antenna. You'll need some high voltage caps but no large coils to wind.

73s

Roger G3XBM

On 23 June 2014 20:33, <[email protected]> wrote:

Dear Group,

I tried again to get an LOA for VLF. This time, the response from Industry Canada was favourable: 10 mW 8.0-8.3 kHz. Yesterday, after a few slight rf burns, and thanks to PA0RDT's miniwhip design and DL4YHF's Spectrum Lab and advice, VLF sigs on 8.277 kHz were heard at 200m from the 100m wire aerial. This was a reception outside my back yard! 10 watts from an 1970's keyboard amp (volume control set on 3) were stepped up with an xfmr to a lossy 500 ohm tuning coil peaked with a ferrite rod for maximum squeal at L=0.35 H.

Is it possible for someone who is not especially enthralled by winding
a mile of 0.7mm wire to use an iron core to make a VLF tuning coil?

73
Joe VO1NA

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