Julian, G4ILO wrote: > > Mike-39 wrote: > >> >> Hi Julian - >> >> Direct keying = FSK >> Audio keying = ASFK >> >> See http://www.aa5au.com/gettingstarted/rtty_start_intro.htm for some >> pro/con arguments re: RTTY. I've always used FSK, so it's my preference >> not to change. I also don't want to deal with the offset between SSB and >> FSK. Or does the K3 deal with that internally? >> >> I'm not too sure about the PSK31 scheme either. >> >> >> > > I took a look at that article, and it seems to me that the K3 negates all > the arguments it raises against using AFSK. The K3 has a dedicated data mode > so you don't need to worry about disabling compression and switching the > audio source, that's done automatically, and it does let you use narrow > filters on receive. Furthermore it's very easy to set up the audio drive > level so you would have to try very hard to overdrive the TX and produce a > distorted signal. > > I'm not sure what you mean about the offset between SSB and FSK. Personally > it has never bothered me that the display is reading the suppressed carrier > frequency while I'm operating somewhere 400 - 2400Hz higher. But in fact > just about all of the sound card software will add the audio frequency on to > the dial frequency so it will log the exact frequency anyway. I appreciate your points, but I want to do it the way I want to do it. <g> That of course may change as it seems to be unusually difficult to accomplish with a K3. Re: PSK/direct earlier... Copied from the K3 user manual
"Modes USB, LSB, AM, FM, CW, and DATA. In DATA mode: FSK D (Direct), AFSK A (Audio), PSK D (Direct) and DATA A (Audio; PSK, etc.). Built in PSK, RTTY, and CW text decode/display." What I mean by offset is having to tune xnnn Hz up/down from the carrier frequency. I'ts just one more mental step that slows me down, and it's un-necessary. I don't understand what your comment about the 400-2400Hz means, unless it's the offset I'm talking about. I've never operated AFSK, so I may be using the wrong terminology. We may be in the area of, as someone said, 'The U.S. and England are two great friends separated by a common language'. Or something like that. I don't really care what frequency is logged, as long as the band is correct. Prehaps log is not what you meant? I use the MMTTY engine in my home brewed logging program, but not the MMTTY GUI. ______________________________________________________________ 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
