blacklogo_orangetext.gif (13932 bytes)Changes in the MUF on HF during the day/night

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Establishing radio communication links in the lower HF bands (below 10 MHz) during a normal day is very difficult because the sun's radiation produces a lot of absorption of the radio signals. This absorption disappears at night as soon as the sun goes down, opening up these bands for use. However you generally loose the upper HF bands because the maximum useable frequencies (MUF) at night are much low.

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11/02/1999 Ruth Bamford