Ron, Your Q202G must be an earlier version, with a different method of adjusting the notch. A Sinclair bandpass cavity uses two loops, so the cavities you have are not bandpass. A photo would be helpful.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n4sfu Sent: Sunday, June 28, 2009 6:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Help with Duplexer Eric, Thanks for the reply. The Sinclair Q202G duplexers that I have do not have the tiny threaded cap next to the loop connector. 1 set of cans are labeled as High pass while the other set is marked as Low pass. I did notice a plate on top of all 4 cans that has noting going to it but cannot fing anything else that shows it can be changed other than the tuning rod. I do currently have these tuned at 146.715/146.115. 73 Ron Hill N4SFU --- In Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> , "Eric Lemmon" <wb6...@...> wrote: > > 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: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of n4sfu > Sent: Saturday, June 27, 2009 7:13 PM > To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > 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 >
