Mark,
Sorry I was a bit late as I was back in the hospital for most of this week.
I'm not as familiar with XBee as I am with the lower frequencies subject to FCC Part 15 Regulations but I believe it will be a better fit for what you want to do.
1. It's pre-approved by the FCC. Getting Part 15 approval can cost several thousands of dollars. There's a loophole for "homebuilt" designs but your application sounds too commercial to fit the loophole.
2. There's much more spectrum and frequency hopping is automagically included so I suspect you can meet your desired schedule. If not, since they are all transceivers, you can do a query/response schedule from a master unit which will be simpler to manage than random transmissions from multiple transmitters.
Good luck and keep us updated - this is likely to interest many others.
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