47 CFR 22.759 - Power limit for BETRS.
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§ 22.759 Power limit for BETRS.
(a)Maximum ERP. The effective radiated power (ERP) of central office and rural subscriber station transmitters in BETRS must not exceed the applicable limits in this paragraph under any circumstances.
ERPw = 557,418 ÷ hm2
where ERPw is the effective radiated power in Watts
hm is the average (eight cardinal radial) antenna height above average terrain in meters