On Mon, Mar 8, 2010 at 7:10 AM, Brian Lloyd <[email protected]> wrote:
> On Sun, Mar 7, 2010 at 10:58 PM, Anony Mous <[email protected]> wrote: > > > In my own designs, when one of the tones is lost (below a ratio), I > switch > > to a mark-against-noise or space-against-noise scheme and usually can > > recover the signal effectively if the remaining tone is half decent. > > Huh. I would have thought that they would have done that in the first > place. Wide shift is a form of frequency diversity and gives you some > ability to recover data in the presence of selective fading. > That's why I phrased the question as I did -- I thought perhaps it was there, but not working as it should. Also, though it is far less common, even 170 Hz shift RTTY can be subject to selective fading, or loss of one level due to interference. --Ben AA7AS
_______________________________________________ fldigi-alpha mailing list [email protected] https://lists.berlios.de/mailman/listinfo/fldigi-alpha
