Goto Section: 90.727 | 90.733 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 90.729 Limitations on power and antenna height.
(a) The permissible effective radiated power (ERP) with respect to
antenna heights for land mobile, paging, or fixed stations transmitting
on frequencies in the 220-221 MHz band shall be determined from the
following Table. These are maximum values and applicants are required
to justify power levels requested.
ERP vs. Antenna Height Table^2
Antenna height above average terrain (HAAT), meters Effective radiated
Up to 150 500
150 to 225 250
225 to 300 125
300 to 450 60
450 to 600 30
600 to 750 20
750 to 900 15
900 to 1050 10
Above 1050 5
^1Transmitter PEP shall be used to determine ERP.
^2These power levels apply to stations used for land mobile, paging,
and fixed operations.
(b) The maximum permissible ERP for mobile units is 50 watts. Portable
units are considered as mobile units. Licensees operating fixed
stations or paging base stations transmitting on frequencies in the
221-222 MHz band may not operate such fixed stations or paging base
stations at power levels greater than 50 watts ERP, and may not
transmit from antennas that are higher than 7 meters above average
terrain, except that transmissions from antennas that are higher than 7
meters above average terrain will be permitted if the effective
radiated power of such transmissions is reduced below 50 watts ERP by
20 log10(h/7) dB, where h is the height above average terrain (HAAT),
(c) Base station and fixed station transmissions on base station
transmit Channels 196-200 are limited to 2 watts ERP and a maximum
antenna HAAT of 6.1 meters (20 ft). Licensees authorized on these
channels may operate at power levels above 2 watts ERP or with a
maximum antenna HAAT greater than 6.1 meters (20 ft) if:
(1) They obtain the concurrence of all Phase I and Phase II licensees
with base stations or fixed stations receiving on base station receive
Channels 1-40 and located within 6 km of their base station or fixed
(2) Their base station or fixed station is not located in the United
States/Mexico or United States/Canada border areas.
[ 62 FR 15996 , Apr. 3, 1997, as amended at 63 FR 32590 , June 12, 1998]
Goto Section: 90.727 | 90.733
Goto Year: 2020 |
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