Goto Section: 90.689 | 90.693 | Table of Contents
FCC 90.691
Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 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: 2006 |
2008
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