Ron, If you really have a Q202G (I'm guessing that "Q020G" was a typo) cavity set, they are not bandpass. What suggests that they are bandpass? The standard Q202G BpBr duplexer has only one loop per can, and a blank plate is installed where a second loop would be. A tiny threaded cap next to each loop connector covers the notch adjustment. Be aware that a Q202G duplexer that was in commercial service will probably have the high-split harness that measures about 12" between the centers of each tee, and will not tune down to the 2m band. The harness drawing is found here: <www.repeater-builder.com/sinclair/sinclair-q202-g-cable-harness.pdf>
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of n4sfu Sent: Saturday, June 27, 2009 7:13 PM To: [email protected] Subject: [Repeater-Builder] Help with Duplexer I dont usually post on the forum but rcv the emails everyday and follow all posts. I recently purchased a 4 can set of Sinclair Q020G cavities not knowing until I had them tuned and connected to the MSR2000 that they are Bandpass only. Needless to say that desense will not permit the rcv of weak signals at all say 5 miles away. Does anyone know of a good place to acquire a couple of the notch cavities with the cables to go with this set or of a good set of BP/BR cavities at a reasonable price to complete this repeater installation. We are located in South GA and are locating this repeaer on 146.715 mhz. All help is appreciated. Ron/N4SFU
