[Amps] Alpha 87a

[Tom W8JI]

> with a slug like the TL-922A or  your 30L1, for example. 
> Maybe one can
> play with the spacing of the input torroids, but I doubt 
> that is easy or
> has much range.

I was surprised by how much inductance range iron cores 
produce as turns are bunched and spread.  I've measured 
various iron cores (T94 size iron toroids) and they can have 
about 30%  inductance change from fully spread to fully 
bunched turns. This is also measured far from 
self-resonance, so it is not the turn-to-turn capacitance at 
work.

That actually was a fix for some Dentron gear. Just squeeze 
the turns together and readjust the capacitors for lowest 
SWR on the input.

73 Tom