On Apr 25, 11:51*pm, Tim Wescott wrote:
David wrote:
Was just wandering if anyone has used or experimented with television
IF, Video and Detector coils, most are slug tuned coils that have a
few uh to several hundred uh, some are sheilded some are not, i have
about 500 that i bought years ago, a lot of them look very close too
the old loopstick type coils, looking for
ideas.
Thanks David

They'll have very low Q, and therefore not really be suitable for a
crystal radio, where low-Q coils fight your ability to get good
selectivity without burning up all your signal before it gets to the
headphones.

There's a whole bunch of _other_ cool things you can do with them, just
not Xtal sets.

--

Tim Wescott
Wescott Design Serviceshttp://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details athttp://www.wescottdesign.com/actfes/actfes.html

I tinkered around a lot with crystal radios back when I was a kid. It
seemed that the most important thing was matching the impedance of the
radio to the antenna. This is much more critical on crystal set than a
modern superhet The only ham in the county impressed me very much with
what a crystal set could do if properly matched to a good antenna
system. He had worked all the states and a lot of the countries using
a crystal radio as his rx. I do think he kind of cheated though by
finding the signal on his regular station rx and then listening for it
on the crystal set.

Jimmie