Well we think that the limit of users that we can still maintain full performance is about 13-16. We are not really sure yet as we have not built that many radios! THis is an area where theory only goes so far, we really need to test it.

When more users (than the maximum allowed) try to turn on, there TX will inhibit itself and tell you to wait for someone to turn off first. But even if things get hairy, the system degrades gracefully, maybe with an audible warning to tell you you are loosing data.

We are making our second system on 900 Mhz now, and it will have different performance. Same princepal but different data rates. We like 900 because of the much reduced path loss.