The bead on a wire idea works. It has been used frequently in crystal
radios.

"-=jd=-" wrote in message
. ..
On Fri 09 Apr 2004 12:40:57p, "CW" wrote in
message :

For many years, it was common practice to use a lead and aligator clip
in place of a roller inductor. Continuously variable and cheap.


I'm thinking a bead (say, 1/2") threaded on a rod (brass for both bead and
rod?), positioned so that the bead can be lifted just slightly, then slid
along the coil - but when you release the bead, there's a bit of tension
pressing it against the coil. I thought about the gator clip method, but
I'm
thinking it might be easier to fool with if I had something I could adjust
without taking my focus off the radio.

Then again, alligator clips and leads are a more widely available than the
pseudo roller inductor parts rattling around in my head...

-=jd=-
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