Hi Most of you who are into duplexers will know W1GAN's old QST-article "A Homemade Duplexer for 2-Meter Repeaters".
His design uses 4" copper tubes, but today many duplexer manufacturers use square aluminium profile as duplexer bodies, i.e. Sinclair but others as well. Now I wondered if W1GAN's design could be used for building such an aluminium square tube duplexer as well and if it would work equally well. Does anybody know? Instead of the 4" round tube, would a 4" square tube be used, or does the circumference matter? Kind regards Martin
