On 9/18/07, Rud Merriam <[EMAIL PROTECTED]> wrote: > In conjunction with getting contributions and collaboration for my site (see > sig line) I exchanged a few message with Rick KN6KB. I asked him for the > details on the SCAMP busy detect. He added digging out the details to a long > to-do list. He did indicate that detecting narrow band protocols (PSK, etc) > was fairly easy. Detecting broadband protocols is much more difficult > because when working properly they appear as noise, as per Claude Shannon. > He did not indicate whether voice could be detected.
Very cool. If you ever get this information, please share! If Rick is comfortable with it, I'd love to get details; if not, even a general outline would be useful. What you describe is pretty much what I'd expect from the method I described in my previous message. The voice and "noise-like" modulation pieces might end up needing much more complex detectors. I'd expect SSB to get detected some of the time, if a high-modulation burst hit during the busy-analysis window. A related but not identical challenge would be to find the "listen window" period that results in best busy-detection yet impacts the turnaround and transmission/message delay for the automated stations. Too long of a listen window both places more stress on the "busy channel" logic and significantly reduces the rate at which messages (or whatever) can be transferred between automated nodes. Too short a window leads to misdetecting the gaps in a QSO as clear channels. Regards, Robert Thompson
