Hello Rick, 1200 bauds is equivalent to 1200 bits/sec as there is 1bit/symbol.
1 letter is worth 8 bits. So in one second, you transmit 1200/8= 150 letters In one minute you transmit: 150*60 or in words: 150*60/6=1500. But as there is an overhead due to adress... 1320 is more realistic. 73 Patrick ----- Original Message ----- From: KV9U To: digitalradio@yahoogroups.com Sent: Thursday, February 01, 2007 4:34 AM Subject: Re: [digitalradio] Re: FNpsk I used to struggle with converting from cps to wpm until one day my brain actually kicked in and I made the association this way: cps x 60 seconds / 6 characters per word = wpm Therefore, if 120 cps x 60 = 7200 / 6 = 1200 wpm Thus, to convert from cps to wpm, just add a zero. To convert from wpm to cps remove a zero. But it also means that your can roughly estimate wpm as being similar to the bps rate unless you are doing FEC and other coding: Thus 1200 bps ~ 1200 wpm. But because of overhead, I usually round a byte up to a nice even 10 bits so I would agree with using a slower value such as your 120 cps. Seem reasonable? 73, Rick, KV9U Walt DuBose wrote: >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 > > >
