Since I am not a programmer, other than taking some rudimentary courses, reading some of Don Lancaster's books, and knowing that it is not something I could ever do very well, something still doesn't seem right to me when it comes to the claim that computers just can not meet the timing requirements of ARQ digital modes.
When I use the computer to key my ICOM 756 Pro 2 with Dave's DX Lab Commander software in order to run other programs that interface with Commander (such as Multipsk which is my main digital sound card program), it does not seem to have much latency at all. And if one could key relatively slow CW as is done with the software for the SDR1000, why would that not be almost a magnitude faster than you would need for adequate ARQ switching speed? How many ms do you need? Rick, KN6KB, the inventor of SCAMP, has said that the power in the typical Windows OS computer we use is something like a magnitude less than that available in the dedicated SCS modems and that is why they perform so well compared to a computer (for the dedicated part). I wonder where the dividing line will come so that computers will at least match the SCS type units? 73, Rick, KV9U Dave Bernstein wrote: >The issue is control over the operating system's scheduling >decisions. There are real-time versions of Linux that are comparable >in this dimension to the firmware running in a TNC; given sufficient >CPU horsepower, a Pactor-2 or Pactor-3 implementation on realtime >Linux is feasible. > >The Windows scheduler cannot be adequately controlled for use timing- >critical applications; as a result, the response time requirements of >protocols like Pactor-2 and Pactor-3 cannot be guaranteed, no matter >how fast the CPU. Generating CW with consistent timing is a challenge >on this platform. > > 73, > > Dave, AA6YQ > > > 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/ <*> 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/
