Goto Section: 95.2777 | 95.2901 | Table of Contents
FCC 95.2779
Revised as of September 1, 2021
Goto Year:2020 |
2022
§ 95.2779 MURS unwanted emissions limits.
The requirements in this section apply to each MURS transmitter type
both with and without the connection of attachments, such as an
external microphone, power cord and/or antenna.
(a) Emission masks. Emission masks applicable to transmitting equipment
in the MURS are defined by the requirements in the following table. The
numbers in the paragraphs column refer to attenuation requirement rule
paragraph numbers under paragraph (b) of this section. The words “audio
filter” refer to the audio filter described in § 95.2775.
Channel center frequencies
(MHz) Paragraphs
151.820, 151.880 and 151.940 (1), (2).
154.570 & 154.600, with audio filter (3), (4), (7).
154.570 & 154.600, without audio filter (5), (6), (7).
(1) Each MURS transmitter type that transmits F3E or G3E emissions on
154.570 MHz or 154.600 MHz and incorporates an audio filter satisfying
the requirements of § 95.2775 in its design may comply with the less
stringent unwanted emissions attenuation requirements set forth in
paragraphs (b)(3), (4), and (7) of this section.
(2) Each MURS transmitter type that transmits on 154.570 MHz or 154.600
MHz, but does not incorporate an audio filter satisfying the
requirements of § 95.2775 in its design, must comply with the unwanted
emissions attenuation requirements set forth in paragraphs (b)(5)
through (7) of this section.
(b) Attenuation requirements. The power of unwanted emissions must be
attenuated below the transmitter output power in Watts (P) by at least:
(1) 7.27(fd−2.88 kHz) dB on any frequency removed from the channel
center frequency by a displacement frequency (fd in kHz) that is more
than 5.625 kHz, but not more than 12.5 kHz.
(2) 50 + 10 log (P) dB or 70 dB, whichever is the lesser attenuation,
on any frequency removed from the channel center frequency by more than
12.5 kHz.
(3) 25 dB on any frequency removed from the channel center frequency by
more than 10 kHz, but not more than 20 kHz.
(4) 35 dB on any frequency removed from the channel center frequency by
more than 20 kHz, but not more than 50 kHz.
(5) 83 log (fd ÷ 5) dB on any frequency removed from the center of the
authorized bandwidth by a displacement frequency (fd in kHz) that is
more than 5 kHz, but not more than 10 kHz.
(6) 29 log (fd2 ÷ 11) dB or 50 dB, whichever is the lesser attenuation
on any frequency removed from the channel center frequency by a
displacement frequency (fd in kHz) that is more than 10 kHz, but not
more than 50 kHz.
(7) 43 + 10 log(P) dB on any frequency removed from the channel center
frequency by more than 50 kHz.
(c) Measurement bandwidths. The power of unwanted emissions in the
frequency bands specified in paragraphs (b)(1) and (3) through (6) of
this section is measured with a reference bandwidth of 300 Hz. The
power of unwanted emissions in the frequency ranges specified in
paragraphs (b)(2) and (7) of this section is measured with a reference
bandwidth of at least 30 kHz.
Goto Section: 95.2777 | 95.2901
Goto Year: 2020 |
2022
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