Greg, Theory says you should not have any problem. With 60 dB isolation and 1000 watts, there may be as much as 1 mW at the input of each receiver - that is 223.6 mV, which is a large signal, but still within the power handling capability of most receivers.
In the practical world, if there are any leakage paths *around* the switch or coupling between the coax lines, then even though the switch itself provides 60 dB isolation, the system isolation may be much lower - just how much depends on your setup. You could set it up and test at lower power - tune the other radios to the transmit frequency and see what the S-meters tell you. 73, Don W3FPR Greg Buhyoff wrote: > Group, > > This is off topic and I would deeply appreciate any responses to be > sent to me off list. I am posting here because I respect the > knowledge and experience of the people who are members of this > reflector. > > This may sound stupid but I have not had experience with this before, > so I ask before I do something stupid. > > I use an external antenna switch mounted on the outside wall of my > house to switch in one of six antennas and have a single coax line > coming into the radio room. I now have four separate radio stations, > 2 K3s and two other radios, all set up differently for different types > and modes of operation. All have amps in line that can be used when > needed -- one a KW and the others 750w output. Currently I manually > attach the output coax for the station I want to use to the coax lead > coming into the house from the external switch. A pain. > > I want to be able to simply use a manual switch to select the station > that would connect to the external antenna switch coax lead into the > radio room. I would then use the manual antenna switch to select the > station and the remote controller to select the antenna. I was > looking at the Alpha Delta manual switch with four switched ports and > a common and then would connect the common to the coax lead coming > from the external antenna switch (DX Engineering) and then each output > coax from each of four stations to the four ports on the Alpha Delta > and then could switch stations via the Alpha Delta manual switch (all > ports not selected go to ground) and, obviously, then select my > antennas as I have been doing using my remote antenna switch. > > Again, this sounds stupid, but I have not had to do this before and > always used manual "antenna" switches to simply select antennas. My > question is this: > > Given the Alpha Delta manual switch has >60dB port isolation -- is > this isolation good enough that I can use the this manual switch to > select stations even though each of the stations has the capability > delivering up to 1 KW output? I don't want to blow out the front ends > of the radios connected to this manual switch. > > I appreciate any answers that can be sent on to me. I know this > sounds stupid, but I have been a ham since 1958 and simply have not > had or needed to do this. I now have four great stations that I > carefully put together as part of a "plan" when I retired and I don't > want to do something stupid at this point. I have done plenty of > stupid things in the past and more will happen, but I thought I could > simply ask a question here with hopes someone can allay my fears of > using such a switching setup or educate me in those things I don't > understand or did not think of. > > Thanks so very much and 73, > Greg K2UM > > ______________________________________________________________ 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
