Section 73.51, Determining Operating Power

47 CFR Section 73.51 requires AM stations to make a notation in station log when using indirect measurement of power determination and to keep a recofd of the applicable value F (efficiency factor) to each mode of operation with a notation of its derivation. FCC staff use these data to assure that station is operating in accordance with authorization and by station personnel, if measurement by indirect method is necessary.

The latest form for Section 73.51, Determining Operating Power expires 2023-10-31 and can be found here.