Goto Section: 90.275 | 90.281 | Table of Contents
Revised as of October 28, 2020
Goto Year:2020 |
§ 90.279 Power limitations applicable to the 421-430 MHz band.
(a) Base station authorizations in the 421-430 MHz band will be subject
to Effective Radiated Power (ERP) and Effective Antenna Height (EAH)
limitations as shown in the table below. ERP is defined as the product
of the power supplied to the antenna and its gain relative to a
half-wave dipole in a given direction. EAH is calculated by subtracting
the Assumed Average Terrain Elevation (AATE) as listed in table 7 of
§ 90.619 from the antenna height above mean sea level.
Limits of Effective Radiated Power (ERP) Corresponding to Effective
Antenna Heights (EAH) of Base Stations in the 421-430 MHz Band
Effective antenna height (EAH) in meters (feet) Maximum effective
radiated power (ERP) (watts)
0-152 (0-500) 250
Above 152-305 (above 500-1000) 150
Above 305-457 (above 1000-1500) 75
Above 457-610 (above 1500-2000) 40
Above 610-762 (above 2000-2500) 20
Above 762-914 (above 2500-3000) 15
Above 914-1219 (above 3000-4000) 10
Above 1219 (above 4000) 5
(b) The maximum transmitter power output that will be authorized for
control stations is 20 watts.
[ 52 FR 6157 , Mar. 2, 1987, as amended at 58 FR 44957 , Aug. 25, 1993]
Goto Section: 90.275 | 90.281
Goto Year: 2020 |
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