Sorry, but why not buy a used Bird Coaxwitch with his isolation higher than 80 dB?I use them and like them very much. Ian IK4EWX
Invio eseguito dallo smartphone BlackBerry 10. Messaggio originale Da: Richard Fjeld Inviato: lunedì 2 gennaio 2017 07:13 A: [email protected] Oggetto: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan levandowski) Years ago, I built such a switch to prevent accidents should one radio transmit when comparing two radios. It is basically an a/b switch such that a radio became the active radio by switching the antenna to it, and simultaneously switching the dummy load to the inactive radio. Neither radio is without a load regardless of the switch position. My switch is just a prototype using an aluminum project box. I called MFJ and suggested they build one. A couple guys got on the call with me, and not long afterward, I saw a product advertised that seemed to be it. It had decent specs for isolation. I can't find it on their site now. The only thing that comes close to it might be the MFJ-1705, but they are describing it differently and there is no schematic. If this isn't the correct switch, It could easily be converted. The important hardware is there. I think I used a DPDT switch (I could check mine). It should have the small coax wired between the connections. I Don't remember the nomenclature for that. Dick, n0ce On 1/1/2017 5:18 PM, Harry Yingst via Elecraft wrote: > I've also have thought about running a switch so I can switch between a > couple of radios here (and a way to idiot proof it). > > I have considered building up something using relays (or a manual switch) > that would switch each radio into either a dummy load or into the antenna > path. > > > > ______________________________________________________________ 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]
