I use Diamond Antenna Switches originally purchased in Japan with good results.
See http://www.diamond-ant.co.jp/english/amateur/equipment/equipment5_swi.html <http://www.diamondantenna.net/cx210a.html>. The claimed isolation up to 200MHz for the two-port CX210A switch is 70dB. I have not actually measured the ones I have. These are available form DX Engineering for about $50.00 Oh, I do not have any connection with either Diamond Antennas or DX Engineering. Bob Nobis n7...@nobis.net > On Jan 2, 2017, at 20:23, Don Wilhelm <donw...@embarqmail.com> wrote: > > Jim, > > The most important factor when talking about connecting multiple transceivers > to antennas is isolation. > The real question is just how much RF energy will leak back into the > non-transmit transceiver. > Yes, there is the possibility of damage to the receiving circuits and T/R > switch of the receive transceive that is just supposed to be listening if it > gets too much RF at its receive input. > > That is what the real discussion is all about. The amount of isolation > required in the switch depends on the power level. If you are talking about > 100 watts power from the transmitter, 40 dB isolation is likely OK, but at > higher powers, you will need more isolation. > > 73, > Don W3FPR > > On 1/2/2017 9:53 PM, Jim Miller wrote: >> Off topic. Sorry. What are the functional disadvantages that make it >> apparently undesirable to build an antenna switch that is a crossover 2 >> radios x 2 antennas? What if you only used one path at a time but could >> switch them easily? Crosstalk? Is it so strong as to damage the other >> radio? Is it not possible to achieve acceptable compatibility with 2 radios >> and 2 antennas? Or to swap amplifiers between two radios and two antennas >> by placing one on the input and another on the output of the amplifiers? Or >> to swap in the better antenna for a short contact that you just can't seem >> to make on the current one? > ______________________________________________________________ > 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 > Message delivered to n7...@nobis.net > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
