10mW is OK for taking a signal from a base station and transmitting it to a pair of goggles a few feet away. That way you don't have to be tethered to your base station.
RB
Very true, but the point is it's unsuitable for a downlink from the model. Anything more in the US for analog video in any band will require a HAM license to be legal.
<RANT>
Niggling point about the thread, however:
Part 15 compliance reg doesn't specify wattage at the transmitter in these bands, it specifies max power in millivolts/m at 3m past the antenna. For an isotropic antenna (theoretical antenna with equal radiation in all direction), you're down to 1/2mw for your analog signal to stay below that -- it will be less if you've got any antenna gain (focusing).
I'm sure someone (maybe not here, but somewhere) has seen a GOV reg that states this magical 10mW level, but I've never seen it and it probably applies only to *DIGITAL* signals. Unless you're flying a AR Parrot, I'd lay BETTER than good odds you're downlink is analog, and the regs are MUCH tighter.
Do not trust the OEMs to interpret FCC reg for you *ESPECIALLY* if they exist outside the US. A "Notice of Operation Without A License" is ALWAYS sent to the operator, never the OEM. Granted, it's almost impossible to get one for FPV flight made away from your residence, but the more people breaking the rules, the more likely the FCC will deal with the problem -- something NONE of us want.
</RANT>
Long story short, get your ham license. Several sections will seem like a waste, but you're going to learn things that help you build a better FPV rig -- better for your use with less interference on others.