Claim: Pseudo-Franklins have been employed below 1400 kHz (neither a Class C nor Class B local frequency), however, to good effect, but no where near as good as a true Franklin; which has an efficiency of about 510 mV/m/kW at 1 km.
Evidence: Pseudo-Franklins have been employed below 1400 kHz, however, to good effect, but no where near as good as a true Franklin. In some cases, a station's efficiency may be restricted to 362.10 mV/m/kW at 1 km for Class A stations, to 281.63 mV/m/kW at 1 km for Class B stations or to 241.40 mV/m/kW at 1 km for Class C stations, unless a higher efficiency was "grandfathered". A true Franklin (180 over 180 degrees; 360 degrees, total) has an efficiency of about 510 mV/m/kW at 1 km.