Since I cannot do all the different modes, I keep wondering what is really the observed speed (throughput) and robustness. In the "old" days, on CW you gave an RST, QSB, QRN reports and assumed that an individual could 100% copy your signal at the speed you were sending or ask QRS. Of course these were all antidotal, but were useful and everyone got to understanding them.
Later we gave S Meter readings and everyone understood that an S9 or better signal gave very good copy and that "armchair" copy was 100%. But where are we today with the various modes? Do we measure throughput (in WPM/CPS)? Do we look at the signal and see if its above the noise, at the noise level or below the noise level if you don't have an S Meter. How do you measure the errors? To make our observations more accurate and useful in evaluating the various modes, we need to at lease start providing "standard antidotal signal analysis". (Yes I know...standard antidotal...) Anyone want to tackle this? 73, Walt/K5YFW Example: User Throughput in WPM/CPS = 60 WPM / 6 CPS Percent Errors = 3% Signal Level = slightly above the noise (well above the noise/at the noise/below the noise/you mean there really is a signal) -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Sent: Thursday, September 21, 2006 1:00 AM To: [email protected] 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 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 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/
