"Mogens" wrote in message
k...
Hi Zoran

"Zoran Brlecic" wrote in message
...


I'm just curious: how do you figure out a 1/4 wavelength on a nine-band
antenna?

OK it sounds funny I know. But on 20 meters the HF6/HF9 works as a 3/8
wavelenght antenna, which has a big feedpoint impedance. It would exibit a
high impedance to the tranciever resulting in a high swr.
This is solved by having a piece of 75 Ohms cable which acts as a quater
wave transformer. The resulting impedance is 50 Ohms.
On other bands the 75 Ohm cable has no influence and is also not needed.

Best 73 de OZ1AKN, Mogens



I dont know about the HF9, but Butternut calls for "RG-11 75 ohm coax,
11'4" if solid dielectric, 13'6" if foam type"

Hope this helps.

This is if the antenna shows high SWR on 20 mtrs, other bands OK.

Kevin