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Part 15 FCC Rules

Part 15 Devices

Unlicensed operation on the AM and FM radio broadcast bands is permitted for some extremely low powered devices covered under Part 15 of the FCC's rules. On FM frequencies, these devices are limited to an effective service range of approximately 200 feet (61 meters). See 47 CFR (Code of Federal Regulations) Section 15.239, and the July 24, 1991 Public Notice (still in effect). On the AM broadcast band, these devices are limited to an effective service range of approximately 200 feet (61 meters). See 47 CFR Sections 15.207, 15.209, 15.219, and 15.221. These devices must accept any interference caused by any other operation, which may further limit the effective service range.

For more information on Part 15 devices, please see OET Bulletin No. 63 ("Understanding the FCC Regulations for Low-Power, Non-Licensed Transmitters"). Questions not answered by this Bulletin can be directed to the FCC's Office of Engineering and Technology, Customer Service Branch, at the Columbia, Maryland office, phone (301) 362 - 3000.


Some Other Part 15 Links!

Summation Below!

So, if you have read the information on this page, you may be wondering “how can I hear him, when I am more than 200 ft. from the transmitter?”  You should understand that given the power output, size limitations of antenna and grounding, that the “effective” service range is about 200 ft.  But, under ideal installations, using the power rating and maximum legal antenna size, and where everything is optimal, many people have achieved ranges of 1 to 1.5 miles with consistency.  And, yes, they are still considered to be legal - - Provided they have followed the rules and regulations regarding Part 15 transmitters!

ยง15.219 Operation in the band 510-1705 kHz.

(a) The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed 100 milliwatts.

(b) The total length of the transmission line, antenna and ground lead (if used) shall not exceed 3 meters.

(c) All emissions below 510 kHz or above 1705 kHz shall be attenuated at least 20 dB below the level of the unmodulated carrier. Determination of compliance with the 20 dB attenuation specification may be based on measurements at the intentional radiator's antenna output terminal unless the intentional radiator uses a permanently attached antenna, in which case compliance shall be demonstrated by measuring the radiated emissions.



Part 15 Rules    US-FCC-Logo.svg[1]

A.M. 1610  Part 15

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