[Amps] coil 3.72
Jim Thomson
jim.thom at telus.net
Sun Nov 24 12:13:44 EST 2019
Should have added...
I use his coil program for loading coils for 40m yagis... and also tank coils for hb amps. Since it spits out RF resistance for a given freq, and knowing the exact RF current flowing through the coil, pretty easy to then calculate the diss in watts...in the coil. For tapped tubing coils, like a 20m tubing coil, tapped for 17,15, 12,10m....and say on 15M, any heat is localized to the portion of the coil being used. I would have thought the un-used portion of
the coil would act as a heat sink.... it does not ! Unused turns remain at ambient room temp..... while used turns can be extremely hot to the touch.
Jim VE7RF
More information about the Amps
mailing list