Well, that's certainly true, Lee. I was just wondering aloud, if the transformers were indeed 1:1, if the point might be common-mode isolation like we work to achieve in the transformers of our flag, pennant and KAZ antennas - although in those cases the matching transformer also matches the 50/75 ohm feedline to a higher impedance of 800-1000 ohms.
73, Charlie, K4OTV -----Original Message----- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Lee K7TJR Sent: Monday, August 31, 2015 12:17 AM To: topband@contesting.com Subject: Topband: KD9SV-OK1RR relays ??? (RX Front End Protector) Sorry Charlie, I don't think I made my thoughts very clear. James was quoting from a QST article that there was an impedance transformation because of the transformers. This was to make a higher voltage at the diodes. My point was that if the transformers being used on their circuit board are 1:1 then there is no impedance transformation and the diodes are fed with the straight RF from the RX antenna at the 50 ohm level. The design must have changed after the QST article or something. The QST description is incorrect if they are using 1:1 transformers as shown in their circuit board pictures. Lee K7TJR _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband