If you are tuning a pass/notch type duplexer you must always tune the pass part first then tune the notch last. Never touch the pass part of the tuning again after you have finished with the notch. You may need to go back and forth sometimes but the notch should always be the last thing that you touch.
73 Gary K4FMX _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Daron J. Wilson Sent: Friday, March 02, 2007 12:14 PM To: [email protected] Subject: RE: [Repeater-Builder] repeater problems, duplexer etc. Anyone have any ideas? Are our crude methods of tuning the duplexer too crude? I would say yes. I've done UHF cans with my service monitor for the signal generator (very adjustable) and an HT to receive it on, and been moderately successful. However, your individual mileage may very, if you are practiced with this method of tuning, you can do quite well. If this is what you have to deal with, I'd try peaking the PASS part of the cans with a wattmeter after you have done all you can with the signal source. That should get you the most through the pass port, though you won't know what the skirts look like or anything, but you will get more power out. Assuming that works, then I'd go for the notch tuning again and see if you can get it close enough. It's tough without the right tools. Good Luck!
