The lowest usable high frequency (LUF), in radiotransmission, 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.
lowest, usable, high, frequency, lowest, usable, high, frequency, radio, transmission, frequency, band, which, received, field, intensity, sufficient, provide, required, signal, noise, ratio, specified, time, period, 0100, 0200, undisturbed, days, month, frequ. 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 See also editMaximum usable frequency Frequency of optimum transmissionSources editFederal Standard 1037C nbsp This article related to telecommunications is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Lowest usable high frequency amp oldid 1147110069, wikipedia, wiki, book, books, library,
