Topband: Submerging variable caps in oil as substitute for vacuum variables
Pete Smith N4ZR
n4zr at contesting.com
Wed Jan 29 17:42:20 EST 2014
The omega match for my shunt fed tower uses two 300 uF roughly 3000-volt
variables I bought from Henry radio a few years ago. I think
occasionally about running more than 100 watts on 160, but the cost of
the vacuum variables is a real issue. February QST has an article on
using mineral oil immersion to increase the voltage capability of
variables in a 600M amplifier. The article does not include any hi-pot
data, but indicates that the maximum capacitance went up a lot.
73, Pete N4ZR
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