Comparison of MUF, FOT and LUF for various antennas during a low
sunspot cycle (SSN10) using an AN/GRC-42 (400 watts).
Unlettered frequency 90 percent, B 80-90 percent, C 60-80 percent, D
40-60 percent, E 20-40 percent, F 0-20 percent reliability.
Transitional frequencies every 2 MHz will be needed between the night
and day frequencies to maintain 24-hour communication.
Nine frequencies should be available, anything less, reliability will
decrease.
A change in frequency at other than the time indicated
will vary. There will be times when fewer frequencies are required.
See page 121 for frequency bands to avoid.
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