Hello Tony If we are talking in the 2 meter ham band---read on.
The PD 497 series duplexer is a very good duplexer until old age sets in-----I have two of them here that have gone noisey---I should say that mine produce wide band noise when transmitter power is applied----lots of desense in spite of looking perfect on the tuneup instruments-----and they are not easily fixed----and a Tx/Rx reversal didn't help. In my case, space is tight---the 497 is shorter than most and replacement with a standard Telewave catalog unit was impossible at the low end of 2 meters . A little pleading with Telewave resulted in their making a special for me that fit nicely in place of the 497 and very nearly equaled the 497 performance which was more than enough for my application. If you are concidering a new duplexer---I suggest that you call Len Pringle (KH8A) at Telewave (1-800-331-3396) and ask about the "2 meter Ham Special" ----their PN TPRD-14556 that he had built for me. ----- Original Message ----- From: Tony L. To: Repeater-Builder@yahoogroups.com Sent: Wednesday, November 07, 2007 8:10 PM Subject: [Repeater-Builder] 2 Meter Duplexer Recommendations? My Celwave PD 497-1-1 VHF duplexer just can't seem to provide adequate tx/rx isolation (Micor 100 watt repeater with 0.6 MHz tx/rx separation). Everything else seems to check out okay; jumper cables, connectors, receiver, and hard line. I've heard the PD 497-1-1 isn't the latest in duplexer design and was wondering what other VHF repeater owners might recommend with regard to high performing, closed spaced duplexers for moderate power applications. Thanks.
