LSMFT had several other meanings... :) -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info
On Tue, 2015-03-17 at 17:47 -0700, Lynn W. Taylor, WB6UUT wrote: > ... and it should be LSB because everyone knows: Low Space Means Fine > Teletype. > > On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote: > > > > Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A > > (LSB) reverses the sense of the tones - Mark is the lower of the two > > audio tones but the higher of the RF frequencies. > > > > 73, > > > > ... Joe, W4TV > > > > > > On 2015-03-17 6:48 PM, Fred Jensen wrote: > >> Hmmm ... this may be the first time Fred Cady's book has failed me. I > >> understand now "what" each mode does. What's still not clear is "why > >> would I choose one over the other?" Operator/User manuals tend not to > >> answer that question, they are understandably focused on exactly how to > >> operate the equipment. > >> > >> I'm very sure that, when I first set up RTTY, I went to AFSK A because I > >> knew what audio frequency shift keying was and I didn't know what DATA A > >> was. It all worked, so I never changed it or tried out the other > >> choice. I guess if AFSK A is LSB and works with MMTTY in its default > >> configuration, then DATA A is USB and I'd have to reverse the tones in > >> MMTTY. > >> > >> I'll leave it as I've been using it, it works so it obviously doesn't > >> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I > >> can't hear 2,125 Hz. Thanks Joe and Mike. > >> > >> 73, > >> > >> Fred K6DGW > >> - Northern California Contest Club > >> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 > >> - www.cqp.org > >> > >> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote: > >>> > >>> On 2015-03-17 12:41 PM, Fred Jensen wrote: > >>> > Can you 'splain the difference between AFSK and DATA A? > >>> > >>> AFSK A and DATA A are both audio modes. AFSK A uses LSB > >>> and FC is set to MARK - 85 Hz (the center of the two RTTY > >>> Tones). DATA A is USB and FC is set to 1500 Hz (the center > >>> of the transmit audio passband [200 - 2800 Hz]). > >>> > >>> AFSK A also allows use of the AFSK transmit filter (a tight > >>> filter around the Mark/Space tones to eliminate hum/pops/etc.) > >>> and the use of the Dual Tone filter on receive. > >> > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:Elecraft@mailman.qth.net > >> > >> This list hosted by: http://www.qsl.net > >> Please help support this email list: http://www.qsl.net/donate.html > >> Message delivered to li...@subich.com > >> > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to k...@coldrockshotbrooms.com > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to d...@nk7z.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
