[Lowfer] Alpha on a degaussing coil

[lloyd chastant]

Dex if you could send along a jpg of your copy of Alpha and sigs in
the 10-25Khz ..would like to see
de Lloyd

On Sun, Feb 28, 2010 at 6:54 PM, Dexter McIntyre W4DEX
<dmcintyre at att.net> wrote:
> Several have asked about the degaussing coil that I used to receive the Alpha
> signals.
>
> The coil is the degaussing coil of wire removed from a CRT TV.  I think this
> type of auto degaussing coil was added to color sets made after the late 60s or
> so.  I suspect the TV service degaussing coils used in the early sets have much
> more wire and probably are self resonant way below 10 KHz.
>
> Here's a pic, coil with LM386 audio amp:
>
> http://www.w4dex.com/vlf/degaussing_coil_a.jpg
>
> The audio amp is needed to receive Alphs with Winrad but not when using a SLM.
>
> (An hour later)
>
> I located a home brew degaussing coil I made in the 60s.  Back then color TVs
> didn't have built in degaussing coils so occasionally a color TV's CRT needed to
> be degaussed to keep the colors clean.  Especially when a high current device
> like a vacuum cleaner was turned on or off while near the set.  I'm sure 90% of
> the subscribers on this group already know that :)
>
> Anyway this coil is self resonant at 5 KHz:
>
> http://www.w4dex.com/vlf/degaussing_coil_b.jpg
>
> Dex
>
>
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