Sunday night, while trying to NCS the Old Military Radio CW Net on 3570 kc at 2100 EDT, I had really strong interference from a very wide high speed RTTY signal down the band, which seemed to be centered around 3655 kc. It sounded like a military/commercial transmission, went on continuously for the duration of the net, and long afterwards. I though it might be an image response on my BC-348, but I was also able to hear it, although at a lower signal level, on several globaltuners.com internet receivers in the north central and north eastern USA and Canada.
Is that part of 80 meters shared spectrum with other services?
How do you know it was high-speed RTTY and not some other mode? Assuming that you weren't able to decode it, what is it about the audio that sounded "military/commercial" ?