IMX "semi breakin" means that you do not need to physically throw any switches to go from transmit to receive.
Compared to "QSK", in semi-breakin you typically do not hear any signals between code characters, letter or even words. Often the timing is variable, but I've never seen anything approaching a specification for the fastest switching that qualifies as "semi-breakin" any more than I've seen a specification for the slowest switching that qualifies as QSK. Some consider a rig full QSK if one can hear between letters, others expect to hear between code elements. 73 Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Edward R Cole Sent: Tuesday, December 04, 2012 4:29 PM To: [email protected] Subject: [Elecraft] OT: definition of semi-breakin I suppose this forum is a good place to ask as so many are CW ops. I am evaluating a pcboard relay for switching RF (Tx/Rx) and need to know what speed that the relay needs to qualify for semi-breakin. Also, a precise definition of semi-breakin would be nice. I get that QSK results in transfer from Tx to Rx after every CW character. I'm guessing semi-breakin switches when there is a pause in transmitting. I can evaluate the switching speed of my candidate relays using a storage scope but need a precise number on how fast they need to be. 73, Ed - KL7UW PS: these relays will be switching 300w RF. ______________________________________________________________ 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 ______________________________________________________________ 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
