ipscone: Yes, tuning a duplexer does require good equipment. Tuning by watching meters doesn't tell you the whole story. I've seen too many duplexers tuned that way (including ones I've tried to do that way) and then put on a spectrum analyzer with tracking generator only to be shocked at what I see. If possible you should try to solicit someone in the area that has the equipment to do it right. Make sure to ask them the dynamic range of their equipment. Often it's not enough to properly tune a duplexer. The equipment should be able to do at bit more than the rated isolation of the duplexer.
Lots of good duplexers available. I've found a number of them on Ebay. Here's probably more information than you want to know on duplexers. http://www.repeater-builder.com/antenna/ant-sys-index.html#duplexers http://www.repeater-builder.com/rbtip/duplexerspecs.html Chuck - N8DNX ipscone wrote: > How much trouble is there in tuning a duplexer? I'm not equipped, at > present, with a lot of test equipment. I suspect I could get one pre-tuned > to a test frequency pair but eventually it would be moved to a cordinated > pair and I'd be stuck with tuning it. :-) I'm sure I could get local > repeater owners to help but just curious how difficult it is to tuning. It > seems that it should be pretty straight forward but I was wondering if it's > possible to tune them by watching power meters and such. Or does it require > freq generators and spectrum analyzers. > > Also, are there any that have discrete tuning capability (i.e. marked for > various freqs. > > Finally, can someone recommend a good duplexer for the 70cm band. > > Thanks > >
