TM 11-5985-362-13
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-10. OPERATION IN UNUSUAL WEATHER
CAUTION
Before lowering, check that on-site wind is below 20 mph (32km/h), to prevent structural damage
to the antenna. Make certain your electrical equipment has been TURNED OFF.
a. HIGH WIND CONDITIONS If winds are predicted with possible gusts in excess of 85 mph (135 km/h) lower the
antenna. The antenna must be lowered while on-site winds are still below 20 mph (32 km/h). See paragraph 2-8 for
lowering instructions.
If ice build up is more than 1/4" (6 mm) radially, and winds are predicted with possible gusts in excess of 75 mph
(120 km/h) lower the antenna. The antenna must be lowered while on-site winds are still below 20 mph (32 km/h).
See paragraph 2-8 for lowering instructions.
2-11. EMERGENCY PROCEDURES
Personnel MUST BE alert to emergency situations: a. Antenna damage such as broken radiator wires. If this
happens in any part of radiating system a high antenna voltage standing wave ratio (VSWR) will result. This can be
seen at the transmitter as high reflected power from the antenna. Continued operations will result in damage to
ANTENNA COUPLER and or the transmitter.
b. Check for damage at the low-frequency end of the curtain (long radiators). You may operate at the high frequencies
with transmitter power reduced.
c.
Emergency operation may be attempted at low transmitter power. This would allow operator to evaluate reflected
power. If reflected power is in acceptable limits operating power may be increased.
2-69/(2-70 Blank)
Previous Page
