Jim H wrote:
On Tue, 14 Jul 2020 18:07:01 +0100, in ,
Jeff wrote:

On 14/07/2020 14:16, wicklowham wrote:
On 11/07/2020 14:57, Jim H wrote:
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Antenna Matching Units ( I prefer not to use the word "Tuner") do have
fixed resistance in inductors and wiring as has been stated in this thread.


No! The amount of inductance varies depending on how much of the
inductor is used, thus the resistance of the unit varies with the
setting. Resistance also varies with frequency since the skin effect
is "deeper" (lower resistance) with lower frequency.

And, the antenna resistance to be matched also varies. When the
antenna is too short it will have a lower resistance, and thus any fixed
losses in tuner and feeder will have a higher relative effect.

All in all it is a completely wrong assumption that the losses will
be independent from frequency, even when te resistive values in the
tuner would be the same.