TM 11-5985-362-13
Table 3-1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. HIGH VOLTAGE STANDING WAVE RATIO (VSWR) AT TRANSMITTER.
Step 1. Shutdown transmitter and tag "out of service."'
Step 2. Check to see if connectors of RF line running from transmitter to antenna
coupler are loose or if cable shows signs of damage or deterioration.
Re-tighten connectors or remove and replace cable if damaged
or deteriorated.
Step 3. Check to see if antenna coupler shows signs of damage or overheating.
Remove and replace if damage is suspected.
Step 4. Check to see if connection of vertical feedline to antenna coupler is tight.
Re-tighten if connection is loose.
Step 5. Check main radiator for broken wire(s) or damaged insulators on catenary
or rear guy drop wires.
Notify responsible maintenance unit.
2. ANTENNA COUPLER SPARK GAP SHOWS SIGNS OF ARCING.
Step 1. Shutdown transmitter and tag "out of service."
Step 2. Inspect for damage.
Clean carbon traces from conductor and standoff with fine sandpaper
(Item 9, Appendix D). Then set spark gap (para 3 - 5 b).
3. TOWER LIGHT ASSEMBLY FAILS TO CYCLE ON AND OFF.
Step 1. Check to see if power cable to light assembly control box is connected to an
active 115 VAC supply.
Re-connect or transfer to active 115 VAC supply.
Step 2. Shutdown transmitter and tag "out of service."
Step 3. Check power cable from 115 VAC supply to light assembly control
box for signs of damage or deterioration.
Notify responsible maintenance unit.
4. TOWER WINCH DOES NOT OPERATE FREELY.
Step 1. Inspect for insufficient lubrication.
Lubricate bearings.
Step 2. Check to see if case or gears are damaged or worn.
Notify responsible maintenance unit.
3-3
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