1. Railroads used medium frequency range ( crossband " ). 2. Medium frequency is defined as 5 15 kHz.3. Navtex broadcasts are primarily made on the medium frequencies of 518 kHz and 490 kHz. 4. At medium frequencies , this appears to " bend " or refract the signal beyond the horizon. 5. Sometimes, part of the medium frequency ( MF ) band ( 300 3000 kHz ) is included. 6. Typically an induction heater operates at either medium frequency ( MF ) or radio frequency ( RF ) ranges. 7. A " Z " marker was sometimes located at low / medium frequency range sites to accurately denote station passage. 8. Observe that for medium frequency you need less contrast than for high or low frequency to detect the sinusoidal fluctuation. 9. Another style of division considers low frequency to be under 1 kHz, and medium frequency at between 1 10 kHz. 10. The AQS-13 systems are all primarily active sonar transmitting in the upper end of the medium frequency sonar range.
