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Date: Wed, 7 Jan 2009 17:25:29 -0500
From: "Warren Ziegler" <wd2xgj@gmail.com>
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Subject: Re: LF: "Crystal" set sorts
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Tom,
> Selectivity was the strongest signal. Is this the "Luxemburg effect?"


   The Luxembourg effect has nothing to do with crystal sets!
The Luxembourg effect is when a very high power transmitter causes
non-linearity in the ionosphere resulting in mixing of different rado
signals. This effect was 1st observed prior to WWII on the very high
power LF transmissions from Radio Luxembourg.

73 Warren K2ORS



On Wed, Jan 7, 2009 at 5:14 PM, Dr. Tom Gruis <donnatom@netins.net> wrote:
>
> Good afternoon, here in EN31do.
>
> Please do not flame me.
>
> I have the top US Commercial 'Phone license (since 1954 - with radar
> endorsement), extra ham radio license, and 40 years in broadcasting mostly
> on the technical side. I am marginally conversant at best on digital
> technology and modes - but still interested. I am not a CW fan because I
> could never develop the coordination necessary; same reason that I could
> never be a very good clarinet player. (I van not even make the "Vulcan"
> sign!)
>
> A question was asked and this is an insight.
>
> A very long time ago I talked to an old ham that said he had done the razor
> blade or equivalent receiving thing. I can no longer find my notes even
> though I still have a crystal set diagram from a junior high teacher of
> mine, a Mr. Harrison in the 1950 period of time.
>
> The earphone, in his recounting, had come from a pilot that had been shot
> down and somehow was not divested of that device before being incarcerated.
>
> A corner of the blade was use against a dissimilar metal or even rust but
> not corrosion. The usual filter capacitor was probably not present and in
> effect is somewhat optional. My memory does not work for the aerial/antenna
> but if the fence wasn't electrified that might be a possibility.
>

>
> There were many prison camps. No doubt there were different schemes for
> reception when it could be done. Of course there is no "pat" answer but it
> is interesting and not all things interesting are practical at all times.
> Maybe this helps.
>
> AND then there is the "stolen power" crystal set scheme which is one section
> for the detection and another to provide a flimsy power supple for an FET or
> some such.
>
> 73 - and happy New Year from Iowa, U.S.A.
>
> Doc.
>
>
>
>
>



-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1