Comparison of MUF, FOT and LUF for various antennas during a low
sunspot (SSN10) using the AN/GRC-142 (400 watts), RATT.
Unlettered frequency indicates 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 53 percent reliability for a 24-
hour period.
Using a 32-foot whip you can expect 87 percent
reliability for a 24-hour period. Using a doublet, sloping (quarter
wave), or inverted vee you can expect 90 percent reliability for a
24-hour period. Six 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.
145
Previous Page
