Watkins-Johnson Company AN/PRD-11 User manual

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OPERATOR’S AND ORGANIZATIONAL
MAINTENANCE MANUAL TM 11-5825-278-12-2
RADIO RECEIVER
DIRECTION FINDER SET
AN/PRD-11
(NSN 5825-01-188-3435)
DEPARTMENT OF THE ARMY
13 SEPTEMBER 1985

TM 11-5825-278-12-2
SAFETY SUMMARY
High voltage is used in the operation of this equipment.
Death
on contact may result if personnel fail to observe the followinq
—
safety
precautions (For Artificial Respiration, refer to FM 21-11):
Do not be misled by the term “Low Voltage.” Potentials as
low as 50 volts may cause death under adverse conditions.
Remove the batteries to the equipment when radio operation
has ceased. Leaving batteries in the equipment when it is
not in use can cause leakage or an explosion leading to
serious bodily damage.
When using any kind of batteries, be careful not to crush,
puncture, dissemble or otherwise mutilate them in order to
avoid possible injury to personnel or damage to the
equipment.
Do not attempt to recharge alkaline or magnesium batteries.
When using nickel-cadmium batteries, observe extreme caution
when recharging by ensuring proper electrical connections
and keeping the charger away from other equipment that may
spark and cause an explosion.
Do not remove the protective covers to the equipment unless
you are authorized to do so.
Do not work on electronic equipment unless there is another
person nearby who is familiar with the operation and hazards
of the equipment and who is competent in administering first
aid.
Whenever possible, turn off the power supply to the
equipment before beginning maintenance on the equipment.
Technician must tell operators where dangerous areas are.
A periodic review of safety precautions in TB 385-4, Safety
Precautions For Maintenance of Electrical/ Electronic
Equipment, is recommended.
Seek advice from your supervisor whenever you are in doubt
about electrical safety conditions.
To prevent electrical shocks or damage to the equipment, do not
operate your direction finder set until you understand the operation
and function of all controls, indicators and connectors.
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TM 11-5825-278-12-2
Battery BA-5598/U used in this equipment is hazardous.
It can
explode or generate high heat and catch fire during use or storage.
This hazard is present even after the battery is discharged and can
no longer operate the equipment. Take the following precautions:
Remove other combustibles from BA-5598/U storage area.
Do not mishandle the battery (short cells, try to charge,
incinerate, take apart, crush case or damage by dropping).
Protect hands from burns when removing overheated batteries
from equipment. Allow equipment to cool off if possible.
If equipment case becomes hot, immediately shut equipment
off.
Do not discard discharged batteries with combustibles.
Do not remove the protective covers to any of the units.
Voltages within these units can cause electrical shock.
Turn off
all power to the units before replacing any of the fuses.
Brackets and cable guide inside front covers have sharp edges
and may cut fingers.
Be careful that you do not catch your fingers as tripod legs
close.
The df antenna is easily damaged through careless or improper
handling.
Use care when setting up the df antenna.
The df antenna is easily damaged through careless or improper
handling.
Use care when tearing down the df antenna.
Do not position the tripod on a slope that is too steep to set
all legs securely on ground. Antenna should not lean more than 30O
from vertical.
Examine antenna mast cables to ensure they will not catch on
thumbscrew.
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TM 11-5825-278-12-2
Do not force compass arm assembly into compass mounting plate.
Aluminum tip will bend and may not be able to be removed.
If D-cell insert contains batteries:
Do not remove batteries before removing cardboard tubes.
Do not use metal tools to remove batteries or you will short
them out.
Wrap cables in loose circles sized to fit within the antenna
carrying bag. If the cables are too tightly wrapped, they will
break.
Before lowering antenna arm be sure antenna mast cables are free
of locking thumbscrews.
Ensure the correct single pin cable is connected to correct plug.
Do not overtighten any of the six single pin cables onto their plugs.
Turn off power to the direction finder set before using angle
simulator.
Do not pack any unit without first ensuring that the batteries
have been removed from the rear covers.
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