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.
Transitional frequencies every 2 MHz between the night and
frequencies will be needed to maintain 24-hour communication.
Using a 15-foot whip you can expect 60 percent reliability for a 24-
Using a 32-foot whip you can expect 80 percent
reliability for a 24-hour period.
Using a sloping wire (quarter
wave) or inverted vee you can expect 85 percent reliability for a 24-
hour period. Using a doublet, you can expect 90 percent reliability
for a 24-hour period.
Eight 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