> Ok, so I was talking about SHARP bandpass filters. Most of us are only interested in what we can build or buy at reasonable cost (not for a Pentagon budget). What you're suggesting MUST be used at the output of a transmitter to reduce phase noise from the TX, so it would VERY difficult to build (and thus expensive). I've seen a few RX XTAL filters (Inrad makes a few) for use between the antenna and the RX (and could be used at the RX IN/OUT of the K3), but they won't help with TX phase noise that lands on your RX frequency.
In practice, the best way to run two rigs on the same band is with lots of separation between antennas and very good radios (like a K3). Remember that we pick up at least 6dB of attenuation by doubling the distance between antennas that are in each other's FAR Field, and even more if in the near field. Several of us who set up country expedition stations for the California QSO Party do that. This past year, we had two good tribanders on tower trailers separated by roughly 150 ft, both aimed to the east coast, and located so that they each was about 90 degrees off axis to the other. With both K3s driving decent 500W amps, we were able to have both rigs on 20M or 15M at the same time and work signals that were S7 or better. To work the weaker stations, we had to put those stations on different bands. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
