RadioBanter - View Single Post

December 25th 05, 12:40 AM posted to rec.radio.amateur.antenna

wrote:
I leave only this.

At VHF and up it's common to use a shorted 1/4 wave section for
second harmonic suppression at the output. Very effective and dirt
cheap. The finals are not the least bit bothered.

If a short appeared near a 1/4 wave node at operating frequency
it might go unnoticed.

I'm afraid it wouldn't go unnoticed. The transmitter would see an open
circuit, instead of the proper load of typically 50 ohms. The effect on
the transmitter would be the same as disconnecting the feedline at the
transmitter.

Roy Lewallen, W7EL