>If I were a company technology officer, of a company who's purpose was >developing communications technology...or the technology officer for >amateur radio, I would be very dis-heartened at the data >protocols/modes/modems produces as well as the HF E-Mail applications >developed. None are really as robust as the should/could be, none of the >sound card modes have the throughput that they should and there are is no >really good HF E-Mail program that is based on the capability of operating >"stand-alone" without using the Internet.
Walt, You have pointed out a basic principle with respect to data throughput. Throughput is a function of bandwidth, power, and coding. With amateur HF we are power, and bandwidth limited. The nature of the media we are opening in makes forward error correction a must, thus we suffer a loss of throughput because of coding. The very robust modes like MT63 and Olivia require interleaving and convolutional coding. Compare MT63 and Olivia with RDFT or amateur DRM. RDFT and DRM are great modes, but requires a fairly high S/N ratio. The challenge is there, but the solution is far from easy. 73, Mark N5RFX 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/
