Hi Win, Well, I opted out of the whole debate by installing a Quadra. Its Zin is 50 ohms resistive, in the range 1.8 ~ 54 MHz. The exciter's ATU is always switched out. The amplifier's ATU makes a fairly decent receive preselector. http://www.ab4oj.com/atu/presel/main.html Cheers for now, 73, Adam VA7OJ/AB4OJ Scanned for viruses by Blue Coat http://www.WinProxy.com/