Interesting. I have a set of 639 cans on my repeater on 446.175 with No problems at all. have no problem with the length of the tuning rods. No desense. and last time I checked about 50 watts out.. BTW the repeater is a SPECTRUM...has been working for years sitting out in the barn. NO I would never use it at a commercial site But its been giving me years of trouble free service. I last tuned it when it was installed back in 1994. last checked it in july this year. Bad connector up at the antenna.
Kevin Custer wrote: > Eric Lemmon wrote: > > >I have used several Wacom duplexers over the years, and I think they are > >excellent products. I recently tuned a WP-639 duplexer in a 2m portable > >repeater, and followed the tuning steps exactly per the instructions to > >achieve a high performance system. The Rexolite rods were between two > >and four inches extended on all cavities, and the response curves were > >almost identical to the curves shown in the instructions. When the PA > >is no more than 20 watts or so, and the receiver has very good front-end > >selectivity, the WP-639 works quite well. > > > > I agree with what is said, but will add one detail. If the repeater > transmitter has a *better than usual* sideband noise figure, the power > can be significantly higher than 20 watts. The GE PLL exciter and solid > state PA will allow about 100 watts with no desense with this duplexer, > or if you are fortunate to have a GE 4EF5A, about 200 watts. > > PLL and/or Tubes are better..... > > Kevin > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
