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Rattan wrote: How can it be a case of “the length doesn’t matter, just make it as long as possible within the 3 meter total limit” and the length of the radiator having to be tuned for best resonance both be true?
Am I missing something here, or are there two (or more) schools of thought on this matter?
No, you’re not missing anything, this is just a function of how complex this issue really is.
On the one hand you can use an antenna of fixed length (say 3 meters) and fine tune using an inductor and/or capacitor. That’s the way this antenna works
On the other hand you can have an antenna with a fixed air coil inductor and tune it by varying the length of the antenna radiator, like this antenna
You can also use an antenna of fixed length and fine tune the air coil inductor using a piece of aluminum like 12vman did here
Or, you can use an iron powder bar in a small inductor to tune like the Talking House
This is why some of us are less inclined to accept the concept of a set of hard and fast rules for antenna construction. There is only one school of thought, because the RF obeys the laws of physics – but there are several ways to get to school 🙂
Experimental broadcasting for a better tomorrow!