Goto Section: 90.689 | 90.693 | Table of Contents
FCC 90.691
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 90.691 Emission mask requirements for EA-based systems.
(a) Out-of-band emission requirement shall apply only to the "outer"
channels included in an EA license and to spectrum adjacent to interior
channels used by incumbent licensees. The emission limits are as
follows:
(1) For any frequency removed from the EA licensee's frequency block by
up to and including 37.5 kHz, the power of any emission shall be
attenuated below the transmitter power (P) in watts by at least 116
Log[10](f/6.1) decibels or 50 + 10 Log[10](P) decibels or 80 decibels,
whichever is the lesser attenuation, where f is the frequency removed
from the center of the outer channel in the block in kilohertz and
where f is greater than 12.5 kHz.
(2) For any frequency removed from the EA licensee's frequency block
greater than 37.5 kHz, the power of any emission shall be attenuated
below the transmitter power (P) in watts by at least 43 + 10Log[10](P)
decibels or 80 decibels, whichever is the lesser attenuation, where f
is the frequency removed from the center of the outer channel in the
block in kilohertz and where f is greater than 37.5 kHz.
(b) When an emission outside of the authorized bandwidth causes harmful
interference, the Commission may, at its discretion, require greater
attenuation than specified in this section.
Goto Section: 90.689 | 90.693
Goto Year: 2010 |
2012
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