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How powerful of a transmitter can you operate legally in the USA? How much space does that cover? I know there is some limit cause drive in theaters used to tra
by jjcon 4y ago
How powerful of a transmitter can you operate legally in the USA? How much space does that cover? I know there is some limit cause drive in theaters used to transmit on FM and I believe there even used to be adapters for cars that would transmit a very very short distance.
- cvoss 4y agoAccording to [0], a 200 ft radius is permitted for unlicensed AM/FM stations. [0] https://www.fcc.gov/media/radio/low-power-radio-general-information https://www.fcc.gov/media/radio/low-power-radio-general-info...
- RF_Enthusiast 4y agoIn the United States, without a license, on FM you can operate with 250 microvolts per meter, measured at a distance of 3 meters. That comes out to about 11 nanowatts. Depending on your receiver, that's probably about 200 feet. On AM, with some exceptions, you can operate with 1/10th of a watt with a 3 meter antenna (a/k/a an inefficient antenna). Depending on ground conductivity, frequency used, local electricity interference floor and the receiver, that can get you out a few hundred feet up to about 1.5 miles (in the most ideal conditions). Bluetooth Auracast is the way to go with terrestrial microbroadcasting in my opinion.