Richard, Without knowing the exact part number of the Celwave duplexer, it is impossible to give you an exact answer. However, if we assume that the Celwave duplexer is a notch-type mobile duplexer with six helical resonators AND is designed to operate in the 460-470 MHz band, it will probably work okay- since GMRS has a 5 MHz split.
Your "local" advisors are correct only to the point that a bandpass/bandreject duplexer may have better performance at a busy RF site, but for GMRS at a quiet site it is a wash. Besides, the small mobile notch duplexer will fit inside the ARU-251 cabinet, while a full-size BpBr duplexer will not. Don't forget to use only double-shielded cable to connect the duplexer to the TX and RX ports on the repeater. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Richard Bessey Sent: Wednesday, November 26, 2008 3:40 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Cellwave Duplexers All, I am hopeful you could all enlighten a beginner. I have a GMRS repeater up and rolling with two antennas using a Uniden ARU-251 repeater. Its not perfect but it works. I am shopping for a duplexer and found the little Cellwave duplexers on Ebay, I can get one tuned and to my door step for roughly $100 Good/Bad? The locals tell me I have to get a large duplexer that is any good, is that true? From what I understand, the larger the more efficient but I am not 100% sure. Any thoughts would be greatly appreciated. -- Regards, Richard Bessey System Administrator Vivio Technologies
