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Communications, Radar & Electronic Warfare (201.. - Index of

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Predicting HF Radio 151Range (km)Figure 9.5(LUF).Absorption by the D-Iayer where the frequency used is below the Lowest Usable Frequency_ . _ . _ . _ . _ MUF'- " ' -.-FOTI.-. - ..-._._ . _ . _ .-'; .........---- --- ... - - LU - - ............"'- ...--- ----0-44-88-12 12-1616-20 20-24Figure 9.6Variations in LUF, MUF and FOT over a 24-hour period. This diagram is indicative only;in practice, it will vary from location to location and between successive days, weeks and months.

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