Sec. 24.238  Emission limits.

    (a) On any frequency outside a licensee's frequency block, the power 
of any emission shall be attenuated below the transmitter power (P) by 
at least 43 + 10 log (P) dB.
    (b) Compliance with these provisions is based on the use of 
measurement instrumentation employing a resolution bandwidth of 1 MHz or 
greater. However, in the 1 MHz bands immediately outside and adjacent to 
the frequency block a resolution bandwidth of at least one percent of 
the emission bandwidth of the fundamental emission of the transmitter 
may be employed. The emission bandwidth is defined as the

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width of the signal between two points, one below the carrier center 
frequency and one above the carrier center frequency, outside of which 
all emissions are attenuated at least 26 dB below the transmitter power.
    (c) When measuring the emission limits, the nominal carrier 
frequency shall be adjusted as close to the licensee's frequency block 
edges, both upper and lower, as the design permits.
    (d) 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.
    (e) 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.

   Policies Governing Microwave Relocation From the 1850-1990 MHz Band