Suurtaajuus

Suurtaajuus, also known as high frequency (HF), refers to the range of electromagnetic waves with frequencies between 3 and 30 megahertz (MHz). This frequency band is commonly used for various communication purposes, including amateur radio, shortwave broadcasting, and military communications. The term "suurtaajuus" translates to "high frequency" in Finnish.

The HF band is particularly useful for long-distance communication because it can propagate over the horizon and even reflect off the ionosphere, allowing signals to travel around the curvature of the Earth. This property makes HF suitable for international broadcasting and emergency communications.

The HF band is divided into several sub-bands, each with specific allocations for different types of communication. For example, the 3-30 MHz range is further divided into segments like 3-4 MHz, 4-5 MHz, and so on, each serving different purposes and having different propagation characteristics.

Despite its advantages, HF communication has limitations. Signal quality can be affected by solar activity, which influences the ionosphere's density and reflection properties. Additionally, HF signals can be subject to interference from other electronic devices and atmospheric conditions.

In summary, suurtaajuus, or high frequency, is a critical component of modern communication systems, offering reliable long-distance transmission capabilities despite its challenges.