If you are planning to use closely spaced Tx and Rx antennas, I would suggest that you consider using a Reed relay or similar "fast acting" relay to short circuit the external preamp's input during transmit periods. Without it there is some risk that during transmit periods the external Rx preamp's input device could be damaged, even if the preamp's DC supply is turned off while transmitting.
Of course if diodes are used for protection instead of a relay, the diodes could generate Tx harmonics which are then radiated by the Rx antenna. 73, Geoff GM4ESD David Cutter write on Saturday, August 21, 2010 at 8:07 AM: > I'm thinking this might also act as a gate to prevent excessive rf getting > into the K3 2nd rx. I'm planning to have a horizontal receive antenna > located adjacent to my vertical transmit antenna for diversity reception. > I > was just investigating the ICE196, but this idea might be better. ______________________________________________________________ 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
