Eric, Are you sure about your six-cavity recommendation? The MASTR II PLL exciter has 22 dB less side-band noise than a typical multiplier exciter - using 600 kHz TX to RX separation. Assuming his preamp isn't driven into a non-linear region (it shouldn't be), a good 4 cavity duplexer, like a WACOM WP-641, should give plenty of isolation...
Kevin Custer > My CommShop calculates 99.65 dB is required. I'd definitely be looking at a > six-cavity BpBr duplexer for this station. > > 73, Eric Lemmon WB6FLY > > --------------------------------------------------------------- > Hope someone may have a program,commshop? What I need to know is what amount > of isolation with duplexers that is required for a GE m2 receiver with > .1...@12db and a m2 pll exciter,100 watt PA on vhf,600kc split?1/2in > helix,with 4pole db224 antenna at 70 ft. > > thanks kj4si
