What is the maximum power permitted on the 2200-meter band?

The 2200-meter band (135.7 to 137.8 kHz) is a Low Frequency (LF) band where amateurs operate strictly on a secondary basis. To prevent harmful interference to primary users, such as utility companies operating power line carrier systems, the FCC restricts amateur output power. The maximum permitted power is 1 watt EIRP (Equivalent Isotropic Radiated Power). Because antennas at this extreme wavelength are physically small and highly inefficient, an amateur might use a transmitter outputting hundreds of watts (PEP) just to achieve that 1 watt of actual radiated power (EIRP). Therefore, limits based purely on PEP are incorrect for this band.