PickyPerkins,
Think it through.....
- There is no equipment in current aircraft capable of transmitting, or receiving and recording, a continuous 10 to 20 kb/sec data stream over a distance of a few hundred miles, omni-directionally.
- The FDR data in the aircraft (usually between FDAU and FDR) are perfectly useless for broadcasting... they would need additional time-stamps, sync, labels, etc. .... i.e., your scheme would require another piece of equipment for the re-coding, which currently doesn't even exist.
I can think of several other points why your scheme is impractical....
Only incremental improvements of existing equipment (such as the pingers) or very cheap add-ons (such as the dye markers) have any chance of being accepted to solve what is a very rare problem.
CJ