EV>TW>I built my first crystal set up in Great Falls Montana in 1947. At night
EV>  >I used to pick up XERO the Full Power Mexican Station down near
EV>  >Clint Texas.

EV>Since reading about your building a Crystal Set, it made me remember the
EV>one I built in High School Radio I Class 1957-1958.

EV>One thing I remember is Shellacking the Toilet Paper Roll's CORE and
EV>winding a long piece of wire on it, and then winding a second Coil over
EV>the first one.

EV>I've noticed the CORE has a bigger diameter Now than when I was younger.

EV>I can remember each Roll having 365 sheets on them back in the late
EV>1960's to early 1970's (when I married the YF) and a package of Four
EV>Rolls cost 79 cents U.S.

EV>Now a "Double Roll" in a package purchased recently has
about 2/3rd's of
EV>the paper on it as it was back in the good old days of the late '60's.

EV>And since the Core is so large it would take a much longer length of
EV>wire to wrap 400 (+ or -) turns on the core.

EV>Wouldn't that change the Inductance in the Circuit???

Inductance of a coil is dependent on 4 factors.
Wire Diameter, Number of turns of wire, coil diameter, and the Relative
Permeability of the coil core material.
Air has a permeability factor on 1 so it is really not a factor in air
core inductors.
I used and on line calcualtor to check and doubling the diameter of the
coil almost doubles the Inductance of the coil.

EV>BTW, I didn't use a Germanium Detector with a Wire Contact when I made
EV>mine, I had to go to get a 1N34A Crystal Detector when I built 'MY'
EV>Crystal Radio Set.

EV>I think I paid 99 cents U.S. for the 1N34A in 1957.


EV> * SLMR 2.1a #T348 * Beware of the .. Oh, NOOO!  Arghhh!!
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