That's not in the least true, but those among us fixated on semantics
continue to push that tired old myth.
You could, for example, have an antenna with a feedpoint impedance of 50
- j40 ohms, and if you insert 40 ohms worth of inductance in series with
the feedline at the feedpoint you will TUNE that antenna to resonance
exactly the same as if you put an appropriate amount of reactance in the
antenna itself or adjust its length ... all of which do exactly the same
thing. The antenna and it's feedline are inseparable as far as the
overall network is concerned. One is not independent of the other ...
ever.
Furthermore, the adjustment (i.e., "tuning") can be done at the shack
end of the feedline with EXACTLY the same effect except for the
transmission line transformation by the feedline, and of course its
associated loss, since whatever is done at the shack end is reflected
back to the antenna end.
Yours is really a very tedious distinction that has no basis in actual
physics or network theory.
73,
Dave AB7E
On 7/17/2020 6:59 PM, Fred Jensen wrote:
No antenna has, at any time, anywhere in any of our lifetimes, been
"tuned" by an "antenna tuner." So called antenna tuners are 2-port
impedance matching networks ... all of them ... and their job is to
match the impedance on one port to another impedance on the second
port, period. Nothing gets "tuned." They come in a variety of
flavors ... a pair of push-pull 807's with a resonant tank and a link
feed to the antenna on open wire line is one. Everything that happens
on the feed line [regardless of it's construction] is the sole result
of the complex impedance at the antenna feed point and the
characteristic impedance of the feedline. No magic.
73,
Fred ["Skip"] K6DGW
"Captain Obvious"
Sparks NV DM09dn
Washoe County
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