Is the antenna cut for the repeater freq? In any case I've never known a bad match into a duplexer tuned into a good match to work.
I've often fudged...Look at forward power while injecting a signal that is noisy (when transmitter is keyed). Gently rock the cavity frequency just a bit. If you hear the receiver improve you get the idea... Not perfect, but may get 'er going for you. GeorgeC W2DB --- In Repeater-Builder@yahoogroups.com, "tahrens301" <tahr...@...> wrote: > > Hi folks, > > Just a bit of an update... got the 6 cavity Telewave > duplexer tweaked up - looks liket pretty much hit > the specs in the data sheet. > > With a dummy load at the 'antenna' port, I used an > "iso-tee" to inject a signal at both the receiver > input, and between the antenna port & the dummy > load. With a weak signal, both places showed me that > there was no desense. Very weak signal would hold in > the repeater. > > However, putting the system on the antenna (a 150-160 mhz > DB-224 100' horizontally & 10' vertically separated) > through a metal building fed with 7/8 heliax, there > seems to be no end to the desense! > > The wattmeter shows 30 watts forward & 3 watts reflected > at the antenna port, if my math serves, it's less than 2:1. > > Can the less than 1:1 match be the culprit? > > Thanks, > > Tim W5FN >
