Hi, I'm relatively new to the HAM scene and have been getting increasingly interested in D-Star (although don't have any D-Star capable equipment).
In the protocol spec I see that there is a flag (Flag 1:bit 7) which denotes data-only or voice+data modes, but otherwise information is a bit sparse on the data side. Q1. In the case of the data-only mode, is the data packed into 96 byte (72+24) frames and sent across the link until complete? I do note that every xx frames is a required to be a sync frame to ensure receiver lock. Q2. Is there any encoding scheme (not the scrambling/line coding) to compress the data to make better use of airwaves and provide FEC? By this I mean a scheme where x byte of ASCII (binary, C40, etc) can be compressed into <x bytes in order to shorten transmission time. Cheers, Simon VA6SDW
