Goto Section: 22.913 | 22.921 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 22.917 Emission limitations for cellular equipment.
The rules in this section govern the spectral characteristics of
emissions in the Cellular Radiotelephone Service.
(a) Out of band emissions. The power of any emission outside of the
authorized operating frequency ranges must be attenuated below the
transmitting power (P) by a factor of at least 43 + 10 log(P) dB.
(b) Measurement procedure. Compliance with these rules is based on the
use of measurement instrumentation employing a reference bandwidth as
(1) In the spectrum below 1 GHz, instrumentation should employ a
reference bandwidth of 100 kHz or greater. In the 1 MHz bands
immediately outside and adjacent to the frequency block, a resolution
bandwidth of at least one percent of the emission bandwidth of the
fundamental emission of the transmitter may be employed. A narrower
resolution bandwidth is permitted in all cases to improve measurement
accuracy, provided that the measured power is integrated over the full
required reference bandwidth (i.e., 100 kHz or 1 percent of emission
bandwidth, as specified). The emission bandwidth is defined as the
width of the signal between two points, one below the carrier center
frequency and one above the carrier center frequency, outside of which
all emissions are attenuated at least 26 dB below the transmitter
(2) In the spectrum above 1 GHz, instrumentation should employ a
reference bandwidth of 1 MHz.
(c) Alternative out of band emission limit. Licensees in this service
may establish an alternative out of band emission limit to be used at
specified band edge(s) in specified geographical areas, in lieu of that
set forth in this section, pursuant to a private contractual
arrangement of all affected licensees and applicants. In this event,
each party to such contract shall maintain a copy of the contract in
their station files and disclose it to prospective assignees or
transferees and, upon request, to the FCC.
(d) Interference caused by out of band emissions. If any emission from
a transmitter operating in this service results in interference to
users of another radio service, the FCC may require a greater
attenuation of that emission than specified in this section.
[ 67 FR 77191 , Dec. 17, 2002, as amended at 82 FR 17583 , Apr. 12, 2017]
Goto Section: 22.913 | 22.921
Goto Year: 2020 |
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