Hi Mark - I have not experienced K3 TX/RX antenna isolation problems with my station configuration. I expect that if there is an isolation problem with your rig's TX and external RX antenna routing/switching, that problem would be nearly impossible to quantify using your station's TX and RX antennas. The rig's TX/RX isolation would need to be measured on the bench, using good laboratory grade equipment.
Perhaps, Elecraft can provide a list of expected isolation values that were measured for each of the TX and external RX antenna routing/switching configurations possible with the K3 and K3S. Those measurements would surely have been done during the rigs' design performance verification tests. GL 73, Terry K4RX ++++++++++++++ Hi Bill, I think this is not what I meant here; I also do use BPF's and the Front End Savers. The problem is that while listening to your receiving antennas, there is also some signal from the transmit antenna getting through thanks to the internal cross-talk of your rig's TX/RX relay. I was wondering what people do besides the obvious 'kill the TX antenna input during RX mode' ? 73 Mark, PA5MW _________________ Topband Reflector Archives - http://www.contesting.com/_topband
