Goto Section: 73.33 | 73.37 | Table of Contents
FCC 73.35
Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 73.35 Calculation of improvement factors.
A petition for an allotment (See Sec. 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
Sec. 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 Sec. 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
Sec. 73.183(c)(1).
[ 56 FR 64858 , Dec. 12, 1991]
Goto Section: 73.33 | 73.37
Goto Year: 2006 |
2008
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