W3FPR has the answer you need here, but I just wanted to add that you aren't changing the inductance of a toroid by changing the coil spacing. You are changing the distributed capacitance of the toroid by doing so.
Eric KE6US www.ke6us.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darrell Bellerive Sent: Sunday, August 28, 2005 4:32 PM To: [email protected] Subject: [Elecraft] Measuring Inductance with the MFJ-259 As I build my second K2, I want to try to measure the inductance of the toroids with my MFJ-259. The MFJ manual has instructions on how to do this. Essentially one builds a series LC circuit and measures the resonant frequency and then calculates the inductance. Has anyone tried this and have any tips or tricks to pass on? Am I correct in assuming I can adjust the value of inductance on a toroid slightly by compressing or expanding the spacing between turns? If so what can I use to hold the turns in place. Friction is probably good enough, but I wonder about a few drops of something like Q-Dope. Comments? 73, Darrell -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada _______________________________________________ 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 _______________________________________________ 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
