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
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