Re: KX3 Field Ant. for 80/40/30

Posted by Ignacy on Nov 22, 2017; 12:06am
URL: http://elecraft.85.s1.nabble.com/Re-KX3-Field-Ant-for-80-40-30-tp7636045p7636160.html

Antenna performance does not depend on how it is fed (if feeder losses are
low) but on height and ground type. For KX3 with AT, any special length
makes little sense, especially in portable conditions. KX3 matches most
random wires, and KX3 with 4:1 balun matches any wires. Lack of balance is
not too important with battery operation. I try to make random wire +
counterpoise at least 1/4 wave on the lowest frequency for reasonable
efficiency.

For 1.5 KW, an endfed with a 49:1 or so transformer makes lots of sense as
wideband tuners for QRO are rare, expensive and heavy. "Myantennas.com"
perfected a  transformer that has very small losses and does not
self-destroy at high power. But in inv V configuration, it is way down from
a flattop.

Ignacy, NO9E  



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