Wayne, Thanks for the explanation. I should have realized that it might have been documented.
My question was prompted by the appearance of a question posted to the "ham radio" formum of Stack Exhange on-line. The OP (original post) of the question mentioned looking at a 1976 ARRL Handbook and seeing a circuit for the keying and wanted an explanation of how that circuit worked. The answers (at the time I read the post) were somewhat simplistic and directed to the circuit that was shown in the question which of course was technology going back to the 1940s or before. Thus, I was curious of the improvements possible with DSP. Thanks, phil, K7PEH > On Apr 7, 2019, at 10:25 PM, Wayne Burdick <[email protected]> wrote: > > By the way, a similar explanation can be found in the Theory of Operation > section of any of our transceiver manuals. > > Wayne > N6KR > > >> On Apr 7, 2019, at 9:58 PM, Phil Hystad via Elecraft >> <[email protected]> wrote: >> >> If you look at various old circuit diagrams of ancient radios made from >> electronic circuits you find that the telegraph keying for the radio >> involves switching on and off the driving oscillator frequency or something >> similar. >> >> However, with an SDR, you have other options and I have no idea how it is >> typically done. For example, a digital signal can be produced that >> represents the Morse coding and this signal need merely be converted to >> analog and amplified. Or, is there still an analog circuit being switched >> on and off for Morse code (telegraphy) keying with a modern SDR. >> >> Can someone describe how this is done in a radio like the KX2. And, is it >> done differently in the different Elecraft radios — I presume that the K2 >> would have the more traditional sort of circuit but that is really just a >> wild guess on my part. >> >> 73, phil, K7PEH > ______________________________________________________________ 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
