What is the Current Maximum Usable Frequency?

This page is part of the project "Understanding HF Propagation."
by Doron Tal, 4X4XM

The maximum usable frequency (MUF) is the highest frequency that can be reliably used for long-distance communication at any given time. It is affected by various factors, including ionospheric conditions, time of day, and location. As a result, there is no single "current maximum usable frequency" that applies universally.

Generally, the highest frequencies used for long-distance communication range from 30 MHz to 50 MHz during the day and 5 MHz to 10 MHz at night. However, these values can vary significantly depending on several factors, and different frequency bands may be better suited for various types of communication (e.g., voice vs. data).

One of the best tools to determine the current maximum usable frequency for a specific location is the MUF 3000 Km HF Propagation Map.

For further explanation, please visit: Regional HF Conditions.

The project "Understanding HF Propagation" provides a detailed overview and tutorials on HF propagation.