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§ 15.235 Operation within the band 49.82-49.90 MHz.
(a) The field strength of any emission within this band shall not
exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
paragraph is based on measurement instrumentation employing an average
detector. The provisions in § 15.35 for limiting peak emissions apply.
(b) The field strength of any emissions appearing between the band
edges and up to 10 kHz above and below the band edges shall be
attenuated at least 26 dB below the level of the unmodulated carrier or
to the general limits in § 15.209, whichever permits the higher
emission levels. The field strength of any emissions removed by more
than 10 kHz from the band edges shall not exceed the general radiated
emission limits in § 15.209. All signals exceeding 20 microvolts/meter
at 3 meters shall be reported in the application for certification.
(c) For a home-built intentional radiator, as defined in § 15.23(a),
operating within the band 49.82-49.90 MHz, the following standards may
(1) The RF carrier and modulation products shall be maintained within
the band 49.82-49.90 MHz.
(2) The total input power to the device measured at the battery or the
power line terminals shall not exceed 100 milliwatts under any
condition of modulation.
(3) The antenna shall be a single element, one meter or less in length,
permanently mounted on the enclosure containing the device.
(4) Emissions outside of this band shall be attenuated at least 20 dB
below the level of the unmodulated carrier.
(5) The regulations contained in § 15.23 of this part apply to
intentional radiators constructed under the provisions of this
(d) Cordless telephones are not permitted to operate under the
provisions of this section.
***NOTE THE PARAGRAPH PERTAINING TO HOME BUILT DEVICES***