Goto Section: 22.859 | 22.863 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 22.861 Emission limitations.
The rules in this section govern the spectral characteristics of
emissions for commercial aviation systems in the Air-Ground
Radiotelephone Service. Commercial aviation air-ground systems may use
any type of emission or technology that complies with the technical
rules in this subpart.
(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 resolution 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 the
measured power is integrated over the full required measurement
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 power.
(c) Alternative out of band emission limit. The licensee(s) of
commercial aviation air-ground systems, together with affected
licensees of Cellular Radiotelephone Service systems operating in the
spectrum immediately below and adjacent to the commercial aviation
air-ground bands, may establish an alternative out of band emission
limit to be used at the 849 MHz and 894 MHz 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.
[ 70 FR 19310 , Apr. 13, 2005]
Goto Section: 22.859 | 22.863
Goto Year: 2020 |
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