Hi all, Probably we've all heard about the recent 2m QRA64 transatlantic contact:
http://www.arrl.org/news/transatlantic-contact-completed-on-2-meters What I find a bit strange is the signal reports of -36dB and -37dB SNR that they give. Even though QRA64 is quite good, I would expect that it's almost impossible to copy QRA64 signals at -36dB. I haven't seen sensitivity graphs for the QRA64 mode that has finally made it into WSJTX, but looking at the graphs in Nico's paper: http://microtelecom.it/qracodes/QRACodes-Rev10.pdf it seems that it's almost impossible to copy anything below -31dB or -32dB, even with lots of a priori info for the decoder. What do you guys think? Are the recordings of the contact available? 73, Dani EA4GPZ. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
