[Elecraft] A/B antenna switch for ladder line fed antennas

[Ron D'Eau Claire]

Kevin, KD5ONS wrote:
I have a fancy switch for A/B antenna testing for coaxially fed antennas 
but do not know what folks use for antenna switches with antennas fed by 
ladder lines.  I want to compare a 160 meter full wave loop fed with 
homebrew ladder line to a G5RV fed by 450 window line.  Any suggestions?  

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One of the problems you run into A/B testing is that you can't wait for a
re-tune. Any delay more than a fraction of a second is too long under most
conditions unless you're working on a very long wavelength (160/80 meters)
and testing ground wave signals.

So the smart thing to do is to put a proper matching network at the end of
each ladder line, then switch the 50-ohm coaxial links to the rig. 

If you're not sure of your matching networks, reverse them after collecting
data and make sure you get the same results.

Ron AC7AC