Darrell, There may be a small apparent change in inductance when adjusting the turns spacing of a toroid, but it would only be a small percentage - look at the formulas for a toroid inductor to verify that fact - there is no term for the turns spacing, and the diameter of the toroid fixes the coil length. Check out http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/indtor.html for the detailed formulas.
If you move all the turns to one side of the toroid core, it may begin to behave more like a solenoidal inductor and the inductance could possibly change because the effective length of the solenoidal inductor will change, but I have not persued that 'angle'. Elecraft usually specifies that the winding should occupy about 85% of the core, so that 'fixes' the length of the coil question for a properly wound Elecraft toroid. The inter-turn capacity is bound to change with the turns spacing, and that may show up as an apparent change in 'inductance' on many meters because they do measure inductance at a specific frequency. The best way I can think of to prove or disprove it would be to measure the time constant in an LR series circuit. 73, Don W3FPR > -----Original Message----- > > Well, it seems now that I am receiving contradictory information. > Specifically > that compressing the turns on a toroid will raise the inductance. > > What is the real scoop. Does compressing or expanding the spacing of the > winding on a toroid change the inductance? Or just the distributed > capacitance of the toroid? Or is this much more complex than I would have > expected? > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.10.16/83 - Release Date: 8/26/2005 _______________________________________________ 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
