I know it is common and accepted practice to short out the turns on
an air-core plate tank coil for bandswitching, but is it ok for
powdered iron core toroids in that situation?
My understanding is that the turns on an air-core inductor are only
loosely coupled to each other and no harm results, but in a toroid
(or any iron core inductor) the turns are all tightly coupled to each
other and placing a short between taps will cause excessive losses.
My Command HF-2500 amp uses a large toroid for the 160/80/40 portion
of the tank coil, and the taps are shorted out for each band. In the
last five years I have burned up two of those toroids and I'm
wondering if that might be the cause. I do a lot of RTTY contesting
at the full legal limit, but the amp is supposedly designed to take
it. On the high bands, it does.
Comments welcome.
73, Bill W6WRT
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