Coils getting hot in antennatuner. Is this normal ?

May 10th 08, 03:01 PM posted to rec.radio.amateur.antenna

D. Huizinga D. Huizinga is offline

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Coils getting hot in antennatuner. Is this normal ?

Hi there.

My 40 mtr doublet is fed with a balanced line of 300 Ohms. Nicely tunable
to 1:1 . But after twenty minutes or so the coil gets rather hot! It is a quality
coil of 3 mm and shiny silvered or chromed on a ceramic body of 1 inch.

How are your experiences with a 100 W tx ? I calculate just 0.3 Amps thru it.
The mind boggles on this..! Where does that heat come from ?

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