I was originally leaning in that direction, purchasing 2 more cans and a new phasing harness. I was told to stop what I was doing and rethink by other hams.
I think you are right. I will order the new cans and make another trip to San Antonio to see Don. Don, if your reading.. I'm a headin up there sometime soon! Aaron --- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <wb6...@...> wrote: > > Aaron, > > I think we've found the cause of your desense: The TPRD-1454 duplexer, > which has four 5" cans, is rated at 77 dB isolation, and is marginal with 20 > watts TX and RX sensitivity of 0.4 uV- which calls for at least 82 dB > isolation. At 100 watts, 95 dB is recommended. While these recommended > figures are ballpark estimates, they have been found to be quite realistic. > > If you were using a tube-type PA, you might get by with your duplexer, but a > solid-state PA needs more isolation. At 600 kHz separation, a duplexer with > four 8" cans or six 5" cans is the norm, and even more is better. Even when > tuned on a network analyzer, a TPRD-1454 duplexer seldom can reach 80 dB- > and that is simply not enough. > > 73, Eric Lemmon WB6FLY > >
