A good mix is 61, There is a winding table for the different cores located
at www.crystalradio.us
Also there are plans listed. Cores are a easy way to get a respectable Q.
The worldwide crystal set contest starts this weekend look for info at the
site




"beginner" wrote in message
...
I made an inductor by winding 14 turns on T82-75 torroid.
Using 180 pF variable capacitor, in a crystal radio circuit I could not
pick up any signal but even with a 470 uH modded inductor I picked up a
few
signals.

Is this material not suitable for this appication?

Thanks