How can 1200 baud = 1320 WPM? In the case of AX.25 baud=bps since a mark-space=one bit.
An 8 bit ASCII character with start and stop bits would be 10 bps so 1200 bps=120 CPS. If a word is 6 characters, then 120 CPS = 20 WPM which we know is too slow. As far as a mode using a VariCode, the WPM throughput would normally be expected to be one CAP for every 60 lower case characters. That's less than 2% caps so I would think that you would get close to 190 WPM (maybe as low as 180 WPM) in a 200 WPM mode using the VAriCode such as used in PSK125. I would assmue that on keyboard-to-keyboard QSOs that the robustness would be more of a concern than the throughput. 73, Walt/K5YFW KV9U wrote: > According to the information in the help files from Multipsk: > > 1200 baud Packet = 1320 wpm > > BPSK125 = 148 wpm capital and 204 wpm small letter average speed at > about -8 db S/N > > Of course this assumes that both have good signal strengths and there > are no hits. If the PSK125 mode takes a hit it keeps on sending and the > receiving station gets errors. If the packet receiving station gets > errors, it requires retries and since this mode also requires much > greater signal strength to operate, it can easily have zero throughput > and time out eventally after many retries. Packet may need something > like +8 db S/N to function. This means it is about the same or slightly > worse than the OFDM mode used in digital SSTV programs. > > Anyone else have more real world numbers? > > 73, > > Rick, KV9U > > > Walt DuBose wrote: > > >>Here is an interesting question... >> >>What is the user throughput in WPM or CPS (what you see on your monitor) in >>1200 >> baud AX.25 and the 190-200 WPM user throughput of PSK125? >> >>I have send many, many pure SMTP messages using sendmail over AX.25 KISS mode >>with a NOS stack. >> >>I have also worked with HTML message/E-Mail templates and find only a couple >>hundred characters different in the template E-Mails/messages and those that >>are >>full and complete E-Mail such as used by sendmail. >> >>Walt/K5YFW >>
