Ah yes . . . The Johnson T-R switch came in two iterations, as I recall. The first one suffered from suck-out, as did the second, but less so.
I still have the later one, having used it for years with a Gonset GSB-100 and HQ-170, and later with my Drake B-twins to operate true QSK (receiver not-muted but protected and monitoring the sending) on the NTS traffic nets. Need to dust that little gem off and get it back in service one of these days. BUT . . . the K3's QSK spoils ya! 73, Kent K9ZTV On 7/8/2010 11:19 PM, Bill W4ZV wrote: > > The E.F. Johnson TR Switch was commercially available in the 50s and allowed > QSK with a single antenna (note the following schematic is dated 1-2-58): > > http://www.w8ji.com/johnson_tr_switch.htm > > I used QSK with one of these at ~500 Watts out and a 75A-4 in the 1959-1962 > era but don't use QSK now because of the complexity of my receiving > antennas. > > 73, Bill > ______________________________________________________________ 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
