5MHz

5 MHz refers to a frequency of five million Hertz. Hertz is the unit of frequency, defined as one cycle per second. In radio communication, 5 MHz falls within the High Frequency (HF) band, specifically around the lower end of the amateur radio spectrum. This band is known for its ability to propagate signals over long distances, particularly during the day, by reflecting off the ionosphere.

Historically, 5 MHz was part of the AM broadcast band in some regions, though its primary modern use is in amateur radio. Amateur radio operators, often referred to as "hams," utilize this frequency for both local and intercontinental communication. Its characteristics allow for reliable communication during propagation conditions that might be unfavorable for other HF bands.

The 5 MHz band is also allocated for various industrial, scientific, and medical (ISM) applications and for certain government uses in different countries. However, its most common and widely recognized application is within the amateur radio community, where it serves as a valuable resource for global connectivity and emergency communications.