My 432 brick has about a 5 DB loss on the receive side. I think it's the relay, but getting to that thing would be a nightmare and I'm not even sure that they're still available. I ran across K3PGP's 1/2 wave filter, and I see that it is an adaptation of the pair of 1/4 wave lines in the old Heath HA-201 amp that they used for T/R switching.
K3PGP's filter: http://www.k3pgp.org/432filter.htm
HA-201 circuit at bottom of djvu file: http://bama.edebris.com/download/heath/ha201/ha201.djvu
So to my question: would I likely encounter any problems using a pair of 1/4 wave coax lines with the diodes in the center to bypass the amp on receive? Has anyone done this sort of thing? I was thinking of putting it inside the case. Domenico, perhaps you? I see your call on K3PGP's page. :)
Bob - AE6RV