I agree completely, Jose. However, all these things can (and often are done) with other modes that do not run as fast. The bandwidths are no differerent than the wider sound card modes at either 500 Hz for Pactor 2 or closer to a voice bandwidth such as Pactor 3 uses. And the Pactor modes don't use particulary unusual modulation schemes either and 100 or 200 baud rates, which while a bit fast for certain kinds of conditions, seems to work better than one would expect.
So what are we doing wrong with existing sound card modes? 73, Rick, KV9U Jose Amador wrote: > >Block coding, to recover errors without >retransmission, interleaving, to convert block losses >into single bit losses (and make error recovery >possible), FEC, in the form of convolutional encoding >with Viterbi (soft) with maximum likelyhood decoding. >Compression, whenever applicable, reduces the data >volume to be sent, and so, content to be mistaken... > >Of course, multicarrier modulation, to allow high data >speeds with low signalling rates, to fight >multipath... >of course, it requires BANDWIDTH... > >It is not a "single trick", but a boxful of them... > >73 de Jose, CO2JA > > > > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
