On Wednesday, October 22, 2014 5:09:16 PM UTC-5, Fred McKenzie wrote:
In article ,
Helmut Wabnig [email protected] --- -.dotat wrote:

Somebody wrote:

If 10 watts is delivered to a short antenna, where does it go if it is not
radiated just as well as 10 watts delivered to a long antenna?


Make it 100 Watts, make it 1000 Watts,

Transmit for 5 minutes, then switch off and measure temperature.

Is the short antenna hotter?

W.-

Yes. I use a Hustler mobile antenna with resonators for each band.
After transmitting 100 Watts, the resonator coils become hot to the
touch. It seems to be worse on the lower bands with larger resonators.

Fred
K4DII

I consider that part of the matching network though.
If you were to apply the same power to a non loaded same length
whip alone, and the matching were before the whip, IE: a tuner, the
whip would change temp very little, while the heat would build
in the tuner inductor. With the loaded antenna, the inductor is part
of the antenna, instead of in the tuner, and that part will get
warmer. But the whip above it, and the mast below it if center
loaded, will stay fairly cool.