After a comment off list from Demeter I checked the Pactor specifications. It uses DBPSK or DQPSK.
Why do the reports about Pactor indicate it is more robust than the QEX article would indicate? Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net > -----Original Message----- > From: Rud Merriam [mailto:[EMAIL PROTECTED] > Sent: Thursday, October 25, 2007 1:10 PM > To: 'digitalradio@yahoogroups.com' > Subject: QEX Article on HF Digital Propagation > > There is a great article in the QEX I just received (Nov/Dec 2007). The > author is Daniel Crausaz HB9TPL in Switzerland. He reports on modeling and > testing PSK, RTTY, Olivia, MFSK, DominoEx and Feld-Hell under various > propagation conditions. I need to digest his work with respect to the OFDM > proposal since the results indicate PSK may not be an optimal choice. > > Olivia works better under all the conditions tested. MFSK seems to be > second. At first glance I would say this is because the transmission rate > is so slow for Olivia at 2.5 character per second. I would find that > painfully slow for even a chat mode. > > Interestingly, RTTY performs about the same under all the conditions > tested. > > PSK either works well or just fails. It has problems in flutter conditions > which seem to me be the conditions prevalent a lot of the time. > > > Rud Merriam K5RUD > ARES AEC Montgomery County, TX > http://TheHamNetwork.net >
