I think the original crystal sets didn't use batteries or any external
source of power either.
The strong AM signal would excite the tuned circuit and you would get audio.
of course, you have to be fairly close to a powerful AM broadcaster to use
one of these with any success.
73
Colin, V A6BKX
----- Original Message ----- 
From: "tillfam3" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 30, 2007 12:39 PM
Subject: Re: interesting article - power over the air]


> Thanks Howard for the great article.  It reminds me of a hamfest I went to
> and the gentleman was displaying a set of radios that he made himself that
> received a AM or a FM station without using batteries or any other power
> what so ever.  You had to listen by using a headset, but the radio station
> came in well.  Sounds like the possibilities can be endless.  Gary KB2YAA
>
>
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