FCC 22.861 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 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]
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