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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 47 - Telecommunication
 Chapter I - Federal Communications Commission
 SubChapter D - Safety and Special Radio Services
 Part 90 - Private Land Mobile Radio Services
 Subpart T - Regulations Governing Licensing and Use of Frequencies in the 220-222 MHz Band

  § 90.729 - Limitations on power and antenna height.  

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  • § 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 Table2

    Antenna height above average terrain (HAAT), meters Effective radiated power, watts1
    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

    1 Transmitter PEP shall be used to determine ERP.

    2 These 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), in meters.

    (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 station; and

    (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]