Robert, I have a trio of those modules working together running the MChip MiWi protocol. The host processor is an 18f4620. Because those modules are able to report on noise levels it is simple enough to write code for them which causes them to find an empty channel.

I am able to run Zigbee and MiWi on the same channel due tot he fact that the 'return receipt' can be relied on to provide an accurate inidcation that a message arrived.

The reason those modules are so cheap is because the user has to write a protocol stack for use on the hist processor where as rhw Telegesis modules already have that part figured out. Although the MChip MiWi protocol is good enough for many ordinary uses, and that is free.

Tge Ember 260 chip is like a condensed ETRX2, but with more functions thrown in, and also has a very easy cgoing command set.

Chris