The Sinclair Q-202G's are excellent duplexers. If you get them tuned properly (not difficult with proper equipment) you will get great service from them. 73 de N5NPO Norm
----- Original Message ----- From: Repeater-Builder@yahoogroups.com <Repeater-Builder@yahoogroups.com> To: Repeater-Builder@yahoogroups.com <Repeater-Builder@yahoogroups.com> Sent: Tue Aug 11 18:01:13 2009 Subject: [Repeater-Builder] Re: Notch Cavities + 600KHz Repeater = Work? - Hi DCflux, Tried the bandpass + notches & didn't change much. On changing to the BpBr, any idea how much capacitance is needed? I have a fistfull of those Johanson caps. Also, a buddy of mine has a Sinclair Q202G that I'm thinking about also. Will pick it up tomorrow & see if it is any better. Thanks, Tim W5FN > If that doesn't work you might try converting them to BpBr. This would > be done by adding a very high quality piston trimmer such as a > johansen cap to the coupling loop, in series with the grounded end. Or > a BNC jack going to a piece of coax that can be trimmed to form a > gimmic capacitor. > > I like to salvage the capacitor from surplus Mastr 2 ICOMs that are > EC. But those have to be soldered in and I'm not sure what material DB > cans use on the rotatable whosis. > > The inner cavity jumpers should be 1/4 wavelength electrically, so you > have to calculate velocity factor of your cables. >
