Didn't see this when the thread first appeared.
It's not that your AVX system won't work elsewhere.
The units will technically "work" anywhere.
A transmitter and matching receiver will function as a closed system and do the job just fine
The issue is that in one geographic area like the US or Europe the frequencies are coordinated so that devices from outside that system can interfere with the proper function of the home systems.
If you're in an open field in Norway - your US frequency AVX system will likely work just fine.
If, on the other hand, you put the same system in the middle of an RF rich London, Berlin or Tokyo setting, and the receiver gets hammered by other devices - you've got a problem because there's nothing regulatory protecting your US frequencies there.
It's not that they won't work. It's that the way they work loses proper regulatory interference protection.
Simple as that.
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