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They shouldn't be, but the 1st harmonic of all of these frequencies falls in the 900 MHz band. Still, it is highly unlikely that a 1/2 watt FRS signal's harmonic (which is very weak) would happen to be near enough one of the robot's channels to interfere with it.
Are the IF radio modems FM? If they are, their signal probably cancels out most interference, unless the interference is very strong.
I'm guessing that most people's interference problems are coming from other robots, bad antenna positioning, or maybe cell phones, but even that seems unlikely to me.
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