FCC 73.35 Revised as of December 4, 2012
Goto Year:2011 |
§ 73.35 Calculation of improvement factors.
A petition for an allotment (See § 73.30) in the 1605-1705 kHz band
filed by an existing fulltime AM station licensed in the 535-1605 kHz
band will be ranked according to the station's calculated improvement
factor. (See § 73.30). Improvement factors relate to both nighttime and
daytime interference conditions and are based on two distinct
considerations: (a) Service area lost by other stations due to
interference caused by the subject station, and (b) service area of the
subject station. These considerations are represented by a ratio. The
ratio consists, where applicable, of two separate additive components,
one for nighttime and one for daytime. For the nighttime component, to
determine the numerator of the ratio (first consideration), calculate
the RSS and associated service area of the stations (co- and adjacent
channel) to which the subject station causes nighttime interference.
Next, repeat the RSS and service area calculations excluding the
subject station. The cumulative gain in the above service area is the
numerator of the ratio. The denominator (second consideration) is the
subject station's interference-free service area. For the daytime
component, the composite amount of service lost by co-channel and
adjacent channel stations, each taken individually, that are affected
by the subject station, excluding the effects of other assignments
during each study, will be used as the numerator of the daytime
improvement factor. The denominator will consist of the actual daytime
service area (0.5 mV/m contour) less any area lost to interference from
other assignments. The value of this combined ratio will constitute the
petitioner's improvement factor. Notwithstanding the requirements of
§ 73.153, for uniform comparisons and simplicity, measurement data will
not be used for determining improvement factors and FCC figure M-3
ground conductivity values are to be used exclusively in accordance
with the pertinent provisions of § 73.183(c)(1).
[ 56 FR 64858 , Dec. 12, 1991]
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