Thanks Eric, That is exactly what I was needing to know. This will give us a good starting point and since it is looking to run only 35 watts it should be OK. That is better than I expected. Anyway I believe it, (the duplexer) is only rated at 50 watts.
Your a gentleman & a scholar. Thanks Randy --- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <wb6...@...> wrote: > > Randy, > > Using a TX frequency of 443.000 MHz and a RX frequency of 448.000 MHz, and > with a receive sensitivity of 0.35 uV, my CommShop program calculates that > 100 watts of TX power requires at least 74 dB of isolation. Since a mobile > (notch only) duplexer is hardly an ideal choice, I'd suggest keeping the > power below 50 watts. Keep in mind that CommShop, like most similar > programs, makes many assumptions that may or may not be true in your > particular case. Keeping the PA from burning up due to a high duty cycle in > repeater service may be more important than avoiding desense. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb8art > Sent: Wednesday, May 27, 2009 11:11 AM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] TX max power > > > > Can some one with one of those fancy programs like Comm-Shop run it and tell > me the max power a Exec II on UHF ham band run with a 75 isolation mobile > duplexer. Assuming that the coax and ant are a ideal setup. > > Randy WB8ART >
