PowerPoint of a presentation 'Wideband HF Waveform Design for MIL-ST-188-110C' given by Eric Johnson at last months HFIA meeting is at
http://www.hfindustry.com/meetings_presentations/presentation_materials/2010_feb_hfia/presentations/hfia02eej.pdf It outlines would could be achieved for HF groundwave comms using 256 QAM 3 kHz Bandwidth - 16000 bits per second 24 kHz Bandwidth - 120000 bits per second Obviously the raw data rate for both waveforms is significantly higher due to error correction overheads. I was thinking a 120,000 bps rate would permit Amateurs to send Video in the 29 MHz and 50 MHz bands. Other HFIA PowerPoints at http://www.hfindustry.com/meetings_presentations/2010_feb_hfia.htm 73 Trevor M5AKA
