[CQ-Contest] Coax stubs located at outside antenna switch?

[Jim Brown]

On 7/12/2024 3:31 PM, Mike Smith VE9AA wrote:
> I am thinking of modifying my SO2R station's antenna setup (would take too
> long to explain what craziness I have going on here now, hi) but do any of
> you locate coax stubs outside, at your remote antenna switches?

Hi Mike,

The effectiveness of stubs is quite sensitive to their precise position 
along the line. I've done serious work on this, and published it several 
years ago in National Contest Journal. It's on my website.

http://k9yc.com/LocatingStubs.pdf

There's also a slide pdf for talks I've done about it at Visalia and 
Pacificon and to some clubs.

http://k9yc.com/StubPlacement.pdf

The answer is yes, they can go on the antenna side of the switch, but 
you've got to go through the calcs to figure out where to put them along 
the line to each antenna if you want them to be effective. My work is 
specifically directed to stubs to kill the second harmonic of power amps.

73, Jim K9YC