Galena crystals which can be used with a cat whisker to work as the detector
or go to radio shack and buy a bunch of genrmainium diodes (1N34A).
I see galena crystals for sale on ebay. Also there is a recipie for making
you own. Just search the net.
Better yet, Harry's homebrew page has a crystal radio made from coffee cans.
It's very kewl looking and working. Check it out here:
http://web.telia.com/~u85920178/
They are called cavity receivers and work on the concept of a resonant
cavity.
Robert VE3RPF
----- Original Message -----
From: "Fred Jensen" <[EMAIL PROTECTED]>
To: "Elecraft Reflector" <[email protected]>
Sent: Wednesday, October 12, 2005 10:22 PM
Subject: [Elecraft] POW Receiver
Off topic, I apologize, but I want to tap the knowledge pool in this
group, and I'll continue regardless:
I'm involved with a 6th grade teacher (a ham, he bought my TS830 a few
years ago) at a local, sort of disadvantaged school. He's trying to find
ways to reach his kids, and ham radio has worked out pretty well so far
with QSO's with a class in Portland OR via 2m and IRLP. I've offered to
help him.
I know the recipe for a "POW Radio Receiver" -- some wire in an inductor,
a capacitor made from rolled up gum wrappers, and a pencil lead on an
anodized razor blade, with some stolen headphones, and as new hams in the
late 50's, my buddies and I built these and listened to KFI. His kids and
he think this would be a great project. We won't hear the WW2 BBC, but we
might hear KFBK if we can make it work.
A couple of problems:
1. Razor blades have changed from the "Gillette Blue Blades" of yore. Can
I still get them?
2. "Razor blades" and "campus" don't sound like they belong in the same
sentence. Any suggestions for substitutes that would pass the "campus
security test?"
3. Any other info anyone might have to help me to, at the beginning of
the 21st century, recreate for these kids something from the middle of the
20th century (when their parents' hadn't yet been conceived).
There's a lot of learning to be had here ... history, reading, learning
how to sequence the steps of a project, and satisfaction in achievement,
and these kids are lacking in nearly all of these things. I wouldn't
attack this if I didn't have a Real Teacher in charge.
Thanks in advance,
Fred K6DGW
Auburn CA CM98lw
PS: We may get some young hams out of this.
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