Tom, thanks for this.

Actually, I do not think it OT. My KAT100 is an unbalanced coupling unit, and my antenna is as described, so I am looking to match it properly! At present I have a 4:1 balun (relieved from duty at the font end of an HF LPDA) connecting the 450 ohm feeder to a short length of coax to the K2/KAT100. I have been told that this is not a very good set-up especially for 160 metres.

I have been reading transmission line and antenna coupling unit theory, but nothing beats theory plus practical knowledge which you seem to possess.

73
Kevin
VK3DAP / ZL2DAP


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