Comparison of MUF, FOT and LUF for various antennas during a low
sunspot (SSN10) using the AN/GRC-142 (400 watts), RATT.
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 between the night and
day
frequencies will be needed to maintain 24-hour communication.
Using a 15-foot whip you can expect only a 50 percent reliability for
a 24-hour period.
Using a 32-foot whip you can expect only an 80
percent reliability for a 24-hour period.
Using a doublet, sloping
wire (quarter wave), or inverted vee you can expect 90 percent
reliability for a 24-hour period.
Four frequencies should be
available, anything less, reliability will decrease.
A change in
frequency at other than the times indicated will vary. There will be
times when fewer frequencies are required.
See page 121 for
frequency bands to avoid.
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