In message , Andrey
writes
How do I design an automatic antenna tuner with no moving parts?

This is a good question.

How to do it - without relays, motor driven capacitors and inductor cotacts?



To make any tuner variable, you have to vary something (and this can
only be an L or a C).
If you don't vary them physically with moving parts, you have to vary
them electrically.
You can change C using Varicap diodes (where you vary a DC voltage.
You can change L by using inductors with cores which you can partially
saturate by varying a DC current.
Neither technique is really applicable to transmission.
Ian.


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