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Tom,
I use the L-match on all ants, from half-waves to
verticals, with a simple differential version for open-wire
doublets.
Currently, I have ~3000pF across the 50R coax at
the remote feed on MF [the resonating vario/L forms part of the
L-match].
Your 6600pF is a good indication of a low
input-resistance and resistive transformation from 50R downwards towards the
ant.
Coincidentally, Mike has just tried the
L-match with my sensitive resistive-reflectometer cct - he nulled at
5600pF.
Your R_in looks like ~24R [Mike's ~28R]; mine
is an appalling ~40R.
Rog.
P.S.
I use the L-match to arrive at i/p
resistance by measuring the C/L values of the nulled cct.
Then, use RFSim to simulate the ant load &
find X & R_in. The results can be verified by substitution on the
bench.
A really good/low R_in [<10R] will require
~15000pF or more on MF.
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