What Dale describes below is a very similar configuration to the MFJ switch I was given a year or so ago - an MFJ-1703.
I just popped the lid off and took a photo of the insides for you: https://www.dropbox.com/s/h28jny6vrkj7rdj/2017-01-01%2018.28.00.jpg?dl=0 The only difference being that it's basically a DPDT slide switch, rather than a rotary. Works just as well. At least, I think that's pretty much what he was describing anyway. Stick a dummy load on one output and your antenna on the other, and your two rigs on the two inputs. 73, and a firm left handshake, John (XLX) -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Dale Martin Sent: 01 January 2017 17:31 To: [email protected] Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan levandowski) Stan, I haven't taken the time to read all the other responses, but have you considered building your own coax switch. Parts: 1 aluminum box, 4 SO-239's, 1 two-pole, multi-position rotary switch (you only need 2 positions, but more is okay), 100w dummy load Mount the SO-239's (J1-J4) and rotary switch Wire up the switch thusly: Pole 1 to J1 (KX2) Contact 1 to J3 (antenna feedline) Contact 2 to J4 (dummy load) Pole 2 to J2 (KX1) Contact 1 to J4 (dummy load) Contact 2 to J3 (Antenna feedline) When you switch one radio the antenna, the other radio is then put on the dummy load. 73, Dale, kg5u > ------------------------------ > > Message: 3 > Date: Fri, 30 Dec 2016 17:49:21 -0500 (EST) > From: stan levandowski <[email protected]> > To: [email protected] > Subject: [Elecraft] {OT} - Variation on use of a coaxial switch > Message-ID: <[email protected]> > Content-Type: text/plain; charset=UTF-8; format=flowed > > I would like to use a coaxial switch for an unintended use and I'm not sure if > it's a good idea in terms of RF isolation and potential equipment damage. > > I'm no expert in this area but I know this list is a wealth of expert opinion, so > here's my question: > > > I want to buy a two position coaxial switch. ?I want to connect ONE > antenna to it and switch this antenna between a KX2/KXPA100 (100 > watts) and a KX1 (about 3 watts). ?The coax cable coming from this > switch to the KX2 is a short piece of RG8X and the coax cable going > from this switch to the KX1 is 25' of RG-174 (yes, I already computed > the dB loss and I can live with).? > > > Am I likely to cause any damage to to either piece of equipment? > > > Thanks, > Stan WB2LQF ************************************* ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
