Greg AB7R wrote: > Other than that > there's no difference between AFSK and DataA.
Actually that turns out not to be the case if you care about the frequency you are tuned to, e.g. for spotting purposes. Data A is Upper sideband and the dial displays the suppressed carrier frequency (as it does in SSB). AFSK A, on the other hand, is Lower sideband, and the dial displays the actual Mark frequency of an RTTY signal tuned in at the selected PITCH (e.g. if PITCH is set to 2125, the display shows the carrier frequency minus 2125 Hz). So to receive a PSK31 station on 14071.5 kHz using narrow DSP filtering, in DATA A you would tune to 14070.00 kHz and set your audio tone to 1500 Hz, but in AFSK A you would tune to 14071.5 kHz and set your audio tone to 2125 Hz (assuming a PITCH setting of 2125-170) - or, to really center the signal exactly, tune to 14071.585 kHz and set the audio tone to 2210 Hz. 73, Rich VE3KI ______________________________________________________________ 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
