Lowest usable high frequency: Difference between revisions

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The lowest usable high frequency (LUF), in radio transmission, is a 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. Any frequency lower than this is not able to fulfill those requirements, while higher frequencies usually yield better result until the maximum usable frequency is reached. The amount of energy absorbed by the lower regions of the ionosphere (D region, primarily) directly impacts the LUF.

Sources

Federal Standard 1037C

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+{{Short description|Radio transmission term}}
-The lowest usable frequencry is when the HF radio wave is absored in the D layer of the Ionosphere it dose not returen to Earth
+The '''lowest usable high frequency''' ('''LUF'''), in [[radio]] [[transmission (telecommunications)|transmission]], is a [[frequency]] in the [[High frequency|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. Any frequency lower than this is not able to fulfill those requirements, while higher frequencies usually yield better result until the [[maximum usable frequency]] is reached. The amount of energy absorbed by the lower regions of the [[ionosphere]] (D region, primarily) directly impacts the LUF.
+==See also==
-Barry
+*[[Maximum usable frequency]]
+*[[Frequency of optimum transmission]]
+==Sources==
+[[Federal Standard 1037C]]
+[[Category:Radio frequency propagation]]
+{{telecomm-stub}}