try OLIVIA under brutal conditions.... it does better than PSK, and almost as well as CW . bonus is the FEC which works very well
John VE5MU ----- Original Message ----- From: Vojtìch Bubník To: digitalradio@yahoogroups.com Sent: Thursday, September 21, 2006 12:00 AM Subject: Re: [digitalradio] Don't hear much clamor about, Chirp, DominoEx, MFSK16 anymore! > I would like to see a very narrow FEC PSK mode which > could be used when condx are very tough. Better to get something through > slowly than not at all. There is FEC built into QPSK31 and PSK63F.PSK63F uses FEC and is roughly as fast as BPSK31. PSK signal is distorted by multipath delay, selective fading, doppler shift and flutter. Sending it slower makes everything better, only succeptibility to rapid doppler shifts and polar flutter will be worse. The reason is that phase shifts introduced by phase modulation will be comparable to phase shifts introduced by ionosphere flutter. It may help to switch to higher baud rates in that case to make modulation phase differences bigger. 73, Vojtech OK1IAK ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.0.405 / Virus Database: 268.12.6/453 - Release Date: 9/20/06 [Non-text portions of this message have been removed] 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/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> 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/
