A year ago I did a number of tests on swinging link coil, type tuners... I
found that for todays 50 ohm, fixed tune, transceivers I always needed a series
cap on the link coil to cancel the reactance... I know that my old DX100B with
it's pi-net output had no problems loading a swinging link without a series
cap... Of course that was 1963 and I had more hair...
Anyway, the whole point of my experiments was for designing a series of
motorized, balanced, link coupled, antenna tuners... I got rid of the swinging
link as a series cap has a much wider tuning/coupling range than the variable
coil... We currently have three of these tuners out in the woods for 80 meters
and just finished building tuner #4 (for 160 meters - a thing of beauty)... It
is motorized (of course), has a fixed link coil wound inside of the tank
coil... Uses a series cap on the link of some 2,800 puffs...
So, to answer your question, based on my empiric testing you will have to
have a series cap..
denny / k8do
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