Goto Section: 90.212 | 90.214 | Table of Contents
FCC 90.213
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 90.213 Frequency stability.
(a) Unless noted elsewhere, transmitters used in the services governed by
this part must have a minimum frequency stability as specified in the
following table.
Minimum Frequency Stability
[Parts per million (ppm)]
Frequency range (MHz) Fixed and base stations Mobile stations
Over 2 watts output power 2 watts or less output power
Below 25 ^1,2,3100 100 200
25–50 20 20 50
72–76 5 50
150–174 ^5,115 ^65 ^4,650
216–220 1.0 1.0
220–222^12 0.1 1.5 1.5
421–512 ^7,11,142.5 ^85 ^85
806–809 ^141.0 1.5 1.5
809–824 ^141.5 2.5 2.5
851–854 1.0 1.5 1.5
854–869 1.5 2.5 2.5
896–901 ^140.1 1.5 1.5
902–928 2.5 2.5 2.5
902–928^13 2.5 2.5 2.5
929–930 1.5
935–940 0.1 1.5 1.5
1427–1435 ^9300 300 300
Above 2450^10
^1Fixed and base stations with over 200 watts transmitter power must have a
frequency stability of 50 ppm except for equipment used in the Public Safety
Pool where the frequency stability is 100 ppm.
^2For single sideband operations below 25 MHz, the carrier frequency must be
maintained within 50 Hz of the authorized carrier frequency.
^3Travelers information station transmitters operating from 530–1700 kHz and
transmitters exceeding 200 watts peak envelope power used for disaster
communications and long distance circuit operations pursuant to Sec. Sec. 90.242 and
90.264 must maintain the carrier frequency to within 20 Hz of the authorized
frequency.
^4Stations operating in the 154.45 to 154.49 MHz or the 173.2 to 173.4 MHz
bands must have a frequency stability of 5 ppm.
^5In the 150–174 MHz band, fixed and base stations with a 12.5 kHz channel
bandwidth must have a frequency stability of 2.5 ppm. Fixed and base
stations with a 6.25 kHz channel bandwidth must have a frequency stability
of 1.0 ppm.
^6In the 150–174 MHz band, mobile stations designed to operate with a 12.5
kHz channel bandwidth or designed to operate on a frequency specifically
designated for itinerant use or designed for low-power operation of two
watts or less, must have a frequency stability of 5.0 ppm. Mobile stations
designed to operate with a 6.25 kHz channel bandwidth must have a frequency
stability of 2.0 ppm.
^7In the 421–512 MHz band, fixed and base stations with a 12.5 kHz channel
bandwidth must have a frequency stability of 1.5 ppm. Fixed and base
stations with a 6.25 kHz channel bandwidth must have a frequency stability
of 0.5 ppm.
^8In the 421–512 MHz band, mobile stations designed to operate with a 12.5
kHz channel bandwidth must have a frequency stability of 2.5 ppm. Mobile
stations designed to operate with a 6.25 kHz channel bandwidth must have a
frequency stability of 1.0 ppm.
^9Fixed stations with output powers above 120 watts and necessary bandwidth
less than 3 kHz must operate with a frequency stability of 100 ppm. Fixed
stations with output powers less than 120 watts and using time-division
multiplex, must operate with a frequency stability of 500 ppm.
^10Except for DSRCS equipment in the 5850–5925 MHz band, frequency stability
is to be specified in the station authorization. Frequency stability for
DSRCS equipment in the 5850–5925 MHz band is specified in subpart M of this
part.
^11Paging transmitters operating on paging-only frequencies must operate
with frequency stability of 5 ppm in the 150–174 MHz band and 2.5 ppm in the
421–512 MHz band.
^12Mobile units may utilize synchronizing signals from associated base
stations to achieve the specified carrier stability.
^13Fixed non-multilateration transmitters with an authorized bandwidth that
is more than 40 kHz from the band edge, intermittently operated hand-held
readers, and mobile transponders are not subject to frequency tolerance
restrictions.
^14Control stations may operate with the frequency tolerance specified for
associated mobile frequencies.
(b) For the purpose of determining the frequency stability limits, the power
of a transmitter is considered to be the maximum rated output power as
specified by the manufacturer.
[ 60 FR 37266 , July 19, 1995, as amended at 61 FR 4235 , Feb. 5, 1996; 61 FR 18986 , Apr. 30, 1996; 61 FR 38403 , July 24, 1996; 62 FR 2040 , Jan. 15, 1997;
62 FR 18927 , Apr. 17, 1997; 67 FR 41860 , June 20, 2002; 69 FR 46443 , Aug. 3,
2004; 69 FR 67838 , Nov. 22, 2004]
Goto Section: 90.212 | 90.214
Goto Year: 2007 |
2009
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