Okay, this is interesting so I approached an answer in my usual way. I grabbed a loose toroidal inductor that had nicely spaced turns filling 90% of the circumference of the core and stuck it in my L-meter. 3.1 uH.
Scrunched all the turns tightly together. They filled about 20% of the circumference. Inductance now 3.3 uH. The L-meter uses a low frequency signal so capacitance shouldn't make much difference in the reading. So fully spaced to totally scrunched, in this case, yielded a 9% change in inductance. It's nice to work the numbers, but I've always tended toward a direct experiment whenever possible. Back in school, I always knew where my soldering iron was but was forever forgetting where I had put my slide rule. I haven't changed. (For the newer readers, a slide rule is the ancestor of the pocket calculator. For comparison, a slide rule is to a calculator as working CW on 40 meters is to making a cell phone call.) Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
