It is kind of ironic that MS-OS and Linux-OS are further from Real Time OS's than the older software. But even with a +/- 10 ms time (worst case 20 ms from one extreme to the other), wouldn't you just have to have a little bit longer "window" than existing ARQ modes in order to succeed?
I think the main thing I am asking is ... how long a window do you need? Pactor uses a 170 ms. idle time. Since the timing from a computer (20 ms maximum error) is not able to switch a transceiver fast enough for Pactor, would 20 times longer than the maximum error be enough? Ergo, 20 x 20 ms = 400 ms window or idle time? 73, Rick, KV9U Patrick Lindecker wrote: >Hello, > >When we were on MS-DOS PC (good old time HI), the clock (and all the hardware >in fact) was accessible by program (through registers) and it was easy to >determine the error of the PC cristal. I measured in several MS-DOS PC an >error of more or less 1/3000, which was not very good, but I suppose it was >not really indipensable to be precise for a PC. >I suppose that the modern PC have the same relative uncertainty. > >I have seen, thanks to Sholto G7TMG, that under Windows the time can be very >precise (down to 100 nanoseconds) but only 64 times by second, and there is no >interpolation between each sample. So the uncertainty in a Windows PC is +/- >7.81ms which rules out ARQ Pactor and Amtor in a Windows PC. > > 73 >Patrick > > > 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/
