Frequency band (MHz) | Minimum path length (km) |
Below 1,990 | n/a |
1,990-7,125 | 17 |
12,200-13,250 | 5 |
Above 17,700 | n/a |
EIRP = MAXEIRP-40 log(A/B) dBW
Where:
EIRP = The new maximum EIRP (equivalent isotropically radiated power) in dBW.
MAXEIRP = Maximum EIRP as set forth in the Table in § 74.636 of this part.
A = Minimum path length from the Table above for the frequency band in kilometers.
B = The actual path length in kilometers.
Note 1 to paragraph (b): For transmitters using Automatic Transmitter Power Control, EIRP corresponds to the maximum transmitter power available, not the coordinated transmit power or the nominal transmit power.
Note 2 to paragraph (b): Stations licensed based on an application filed before April 16, 2003, in the 2450-2483.5 MHz band, for EIRP values exceeding those specified above, may continue to operate indefinitely in accordance with the terms of their current authorizations, subject to periodic renewal.
47 C.F.R. §74.644
Links authorized prior to April 1, 1987, are excluded from this requirement, except that, effective April 1, 1992, the Commission will require compliance with the criteria where an existing link would otherwise preclude establishment of a new link.