On 9/17/07, Dave Bernstein <[EMAIL PROTECTED]> wrote: > Busy detectors are the solution to the hidden transmitter problem for > unattended stations.
Actually, the problem is that a busy detector won't *see* a hidden transmitter. That's why it's called "hidden". If someone can make a busy detector that can solve the hidden transmitter problem, 802.11B/G (wifi networking) would be about 30%-60% more efficient in a multiple access point large campus network. And that's the *easy* case, where you don't care about stepping on non-wifi waveforms and know *exactly* what you're looking for in a gaussian microwave environment. It is feasible to create a busy detector that can detect one family of modulations on an ideal channel. It is very much not feasible to detect all likely modulations, especially in non-ideal "real world" HF channel conditions. This is true of "by ear" detecting even more than DSP logic. After all, there may be a QRP QSO that is below the noise floor to you. This doesn't mean that you'll be below their noise floor.
