The bps with packet is the same as the baud rate. With other modes that have different levels, the signalling rate (the baud rate) can have more than one bit sent per baud.
The fastest baud rate that Pactor uses is 200 baud, but the bps rate is many times faster with P2 and P3. The speed of conventional packet used to seem nearly fantastic when you watched 1200 baud data coming through with each packet. The lines of text would kind of lay down or unfold across the screen or across the printer if you were taking it directly as a printed document. In one minute, it would more than fill a page if you had a 100% connection with no retries due to weak signals or interference. Then we got 9600 and 14400 bps modems for our computers through the phone lines and 1200 baud radio seemed very slow indeed. Of course when the data goes through the phone line, the baud rate is not that high from what I understand. But with all the trellis codes and such, they could get the bps rate eventally up to almost 56k on a very good line because of the stability of wireline. We can not do that on RF circuits since there is more variation in amplitudes and more interference, etc. 73, Rick, KV9U Walt DuBose wrote: >So is 1200 baud = 1200 bps and 1200 bps (1200 / 8) = 120 cps? > >If so then 120 cps (120 / 6) = 20 wps X 60 sec. or 1200 WPM. > >That's over 1.5 pages per minute. (Page = 72-76 characters X 60 - 66 lines >per >page.) > >Walt/K5YFW > >Chris Jewell wrote: > > >>Walt DuBose writes: >> > 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. >> >>(120 chars/sec) / (6 chars/word) = 20 words / second (not per minute) >>20 x 60 = 1200 words/minute. >> >>Besides, while I don't know a lot about AX.25, I'm pretty sure that >>X.25, from which AX.25 is derived, is synchronous (no start or stop >>bits). >> >> >> > > > > >
