RG-8 is not good for duplex. The braid will make TX noise and get into the receiver. Cheap antennas can make the same problem. Test into a dummy load right at the duplexer. If no noise then you know it's the feed line and/or antenna.
6.5 inch dia cans are big ones so you should have plenty of isolation specially for 2 watts. On Fri, May 21, 2010 at 7:28 AM, kc0mlt <[email protected]> wrote: > > > Hello all. > > I am trying to figure out if the duplexer we have put together is up to the > task or not. Here is the situation. We have four cavities 6.5" dia. one is a > vari-notch the others are simple reject cans. Two rejects are on the TX side > and one reject and the vari-notch are on the RX side. All set and tuned with > rg-213 jumpers between cans and RG-142 from the cans to the Tee connector. > We are doing some light testing with a cheap dual ban antenna on the garage. > It is feed with RG-8 about 70 feet. We are having some issues with receive. > It kind of sounds like desense but I think it is something wrong with the > receiver. I was just wondering if the cobbeled together cans sound like thay > are doing a good enough job as a duplexer or if we do have something to > change on it. The repeater is only putting out 2 watts for testing. I would > think I have enough separation for that power level. Any suggestions or > thoughts woyuld be greatly appreciated. > > Thanks > Wade > KC0MLT > > > -- :wq Tim
