HF NVIS Frequency Selection – Idaho ARES

TorchoftheBurningSky

Understanding propagation is critical to successful cloud burning.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

via Idaho ARES – HF NVIS Frequency Selection.

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