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I shunt feed my 100' of Rohn 45 using a three wire cage. Matching is
performed with this "Shunt-C/Series-C" matching
system. I
use a remote motor driven vacuum variable capacitor. The matching
system is
enclosed in a black and clear waterproof Plexiglas enclosure with the
motor drive
vacuum variable control unit
located in the shack. Due to a lightning strike in 2023, the
shunt
capacitors have all been replaced. Probably a lower "Q" resulting in a
bit more bandwith. I can now tune the entire lower porion of the band
without need of adjustment in the series vaccum variable. (See the SWR
chart) I have also added a Watts Engineering common mode choke at the
feedpoint. The pictures below
provide more detail. |
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