No piston trimmer that I can see, unless it's inside the can across the loop. I was thinking of cracking one open to find out. Anyway, though, it would have to be adjustable to peak up the cavity, so why would they hide it in there?
On the ring duplexer, it supposedly just inverts the notch of the can into an equally sharp bandpass....by making a steep cut away from the rx frequency, it should hold off the tx to some extent....right? As I said, I have one additional can now, with two ports in/out, so I'll throw that one in the tx lead to make a 3-can setup. If this sounds all wet, please let me in on the right answer. -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Kelley Sent: Friday, August 12, 2005 5:50 PM To: [email protected] Subject: Re: [Repeater-Builder] Duplexer Configuration Question > I have procured a set of Decibel D4140-2C cavity filters (just 2 cans) > setup for 153.695 pass and 153.290 reject. These are notch-type > cavities (I guess) since they have only one loop port each. I'm not familiar with those particular cavities, but many of the Decibel pass-reject cavities only have one loop / connector. Is there a piston trimmer right beside the RF connector? > I've been thinking about trying > the "hybrid ring" technique with these, cascaded on the > rx side (leaving the tx side as straight through to the > antenna). It's a quiet site, and the antenna will be a > Ringo mounted on the side of the tower at about 50 feet. Umm... I need to review the operating principle of the hybrid ring duplexer, but how would you get both protection from the TX carrier and TX noise on the RX freq with that configuration? This may be a stupid question... as I said I need to review the theory on that... been a LONG time... Paul, N1BUG Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.8/71 - Release Date: 8/12/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.8/71 - Release Date: 8/12/2005 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
