Lowest usable high frequency

The lowest usable high frequency (LUF), in radio transmission, is that frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month. The amount of energy absorbed by the lower regions of the ionosphere (D region, primarily) directly impacts the LUF.

单词	Lowest usable high frequency
释义	Lowest usable high frequency 英语百科 Lowest usable high frequency The lowest usable high frequency (LUF), in radio transmission, is that frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month. The amount of energy absorbed by the lower regions of the ionosphere (D region, primarily) directly impacts the LUF.
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