Sec. 27.53  Emission limits.

    (a) The power of any emission outside the licensee's frequency 
band(s) of operation shall be attenuated below the transmitter power (p) 
within the licensed band(s) of operation, measured in watts, by the 
following amounts:
    (1) For fixed, land, and radiolocation land stations: By a factor 
not less than 80 + 10 log (p) dB on all frequencies between 2320 and 
2345 MHz;
    (2) For mobile and radiolocation mobile stations: By a factor not 
less than 110 + 10 log (p) dB on all frequencies between 2320 and 2345 
MHz;
    (3) For fixed, land, mobile, radiolocation land and radiolocation 
mobile stations: By a factor not less than 70 + 10 log (p) dB on all 
frequencies below 2300 MHz and on all frequencies above 2370 MHz; and 
not less than 43 + 10 log (p) dB on all frequencies between 2300 and 
2320 MHz and on all frequencies between 2345 and 2370 MHz that are 
outside the licensed bands of operation;
    (4) Compliance with these provisions is based on the use of 
measurement instrumentation employing a resolution bandwidth of 1 MHz or 
less, but at least one percent of the emission bandwidth of the 
fundamental emission of the transmitter, provided the measured energy is 
integrated over a 1 MHz bandwidth;
    (5) In complying with the requirements in Sec. 27.53(a)(1) and 
Sec. 27.53(a)(2), WCS equipment that uses opposite sense circular 
polarization from that used by Satellite DARS systems in the 2320-2345 
MHz band shall be permitted an allowance of 10 dB;
    (6) When measuring the emission limits, the nominal carrier 
frequency shall be adjusted as close to the edges, both upper and lower, 
of the licensee's bands of operation as the design permits;
    (7) The measurements of emission power can be expressed in peak or 
average values, provided they are expressed in the same parameters as 
the transmitter power;
    (8) Waiver requests of any of the out-of-band emission limits in 
paragraphs (a)(1) through (a)(7) of this section shall be entertained 
only if interference protection equivalent to that afforded by the 
limits is shown;
    (9) In the 2305-2315 MHz band, if portable devices comply with all 
of the following requirements, then paragraph (a)(2) of this section 
shall not apply to portable devices, which instead shall attenuate all 
emissions into the 2320-2345 MHz band by a factor of not less than 93 + 
10 log (p) dB:
    (i) The portable device has a duty cycle of 12.5% or less, with at 
most a 312.5 microsecond pulse every 2.5 milliseconds;
    (ii) The portable device must employ time division multiple access 
(TDMA) technology;
    (iii) The nominal peak transmit output power of the portable device 
is no more than 200 milliwatts (25 milliwatts average power);
    (iv) The portable device operates with the minimum power necessary 
for successful communications;
    (v) The nominal average base station transmit output power is no 
more than 800 milliwatts when the base station antennas is located at a 
height of at least 8 meters (26.25 feet) above the ground;
    (vi) Only fixed and portable devices and services may be provided: 
vehicle-mounted units are not permitted; and
    (vii) Transmitting antennas shall employ linear polarization or 
another polarization that provides equivalent of better discrimination 
with respect to a DARS antenna;
    (10) The out-of-band emissions limits in paragraphs (a)(1) through 
(a)(9) of this section may be modified by the private contractual 
agreement of all affected licensees, who shall maintain

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a copy of the agreement in their station files and disclose it to 
prospective assignees or transferees and, upon request, to the 
Commission.
    (b) For WCS Satellite DARS operations: The limits set forth in 
Sec. 25.202(f) of this chapter shall apply, except that Satellite DARS 
operations shall be limited to a maximum power flux density of -197 dBW/
m2/4 kHz in the 2370-2390 MHz band at Arecibo, Puerto Rico.
    (c) 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.
[ 62 FR 16497 , Apr. 7, 1997]