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Originally Posted by TinCanAlley
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Does anyone know what is now using the channel 3 range? I don't want to interfere with something if I end up with too much power.
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Channel 3 (low VHF) is still used for commercial TV broadcast in some cities. you need to consult the FCC site or a site like antennaweb.org to determine what RF channels are in use in your area. Note that a strong signal on channel 3 can cause adjacent-channel interference on channels 2 and 4.
I haven't looked at Part 15 recently, but I think it may specify field strength, not output power. If so, this will be a real problem to measure without a calibrated field strength meter and antenna.