Antenna Group OE-254/GRC PURPOSE Provide in-depth training

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ANTENNA GROUP OE-254/ GRC
AGENDA
PURPOSE TASKS, CONDITIONS AND STANDARDS
DESCRIPTION TECHNICAL CHARACTERISTICS
WARNING STATEMENTS INSTALLATION INSTRUCTIONS
SUMMARY HANDS ON EXERCISE
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Antenna GroupOE-254/GRC
PURPOSE
Provide in-depth training and evaluation in the
installation of Antenna Group OE-254/GRC.
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Install Antenna Group OE-254/GRC
Tasks, Conditions and Standards
TASK Prepare the OE-254/GRC for installation.
Inventory parts, components and running spare
parts making sure all necessary safety equipment
is on hand. Erect antenna to standard.
CONDITIONS Soldiers given complete OE-254/GRC
antenna. (IAW TM
11-5985-357-13, Aug 1978)
STANDARDS Soldiers will demonstrate ability to
fully erect OE-254/GRC Antenna. (IAW TM
11-5985-357-13, Aug 1978)
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Description
OE-254/GRC
is an omni-directional, biconical antenna
designed for broadband operation without field
adjustment from 30 to 88 MHz frequency range up
to approximately 500 watts.
The antenna system includes O A standard
lightweight mast having a maximum height of
41 feet and 9 inches. O A canvass carrying bag
with assembly and erection procedures. O
All necessary guy assemblies, stakes, base
plate, tools, and other ancillary equipment
required to make a complete antenna
system. O All necessary coaxial cables and cable
adapters.
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Technical Characteristics
Frequency Range-----------------------------------
---------------------------------30 to 88 MHz RF
power capability----------------------------------
--------------------------350 watts
nominal Distance Range (nominal) when used with
radio sets (on high power) except the
AN/PRC series Between two
Antennas Group OE-254/GRC
Average terrain---------------------------
---------------------------36 miles (57.9 km)
Difficult terrain---------------------
----------------------------------30 miles (48.3
km) Between Antenna Group
OE-254/GRC and vehicular whip antenna
Average terrain------------------------------
------------------------30 miles (48.3 km)
Difficult terrain------------------------
-------------------------------25 miles (40.3
km) Distance Range (nominal) using Radio Sets
AN/PRC Between two Antenna
Groups OE-254/GRC----------------12 miles (19.3
km) Between whip antenna and
Antenna OE-254/GRC-------- 8 miles (12.9 km)
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Technical Characteristics
Antenna erection time (2 persons)-----------------
--------------------15 minutes Erected height
(nominal)---------------------------------41 ft,
9 in. (12.7 meters) Input impedance to radio
(nominal)--------------------------------------50
ohms Type of radiation pattern--------------------
--------------------------Nondirectional Weight
(packed)------------------------------------------
-------43 lbs 8 oz (19.73 kg)
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WARNING STATEMENT
TAKE IN CONSIDERATION - DISTANCE
- TRANSMISSION - WEATHER

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INSTALLATION INSTRUCTIONS
A. Positioning baseplate and guy stakes B.
Assembling antenna equipment C. Assemble the
antenna D. Erection using two persons E.
Lowering the antenna
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INSTALLATION INSTRUCTIONS

A. Positioning baseplate and guy stakes 1.
Place the baseplate with the ribs up where the
antenna is to be erected. 2. Drive the stake of
the mast and base assembly through the center
hole of the baseplate with the hammer.
3. Drive the two pin stakes through opposite
corner holes of the baseplate. 4. Locate the
position of the four guy stake assemblies at a
maximum radius of 25 feet (7.62 meters)
from the center of the baseplate and a 90 degree
angle between stakes. The baseplate ribs
should be in alignment with two opposite stake
assemblies. 5. The guy stake positioning radius
can be approximated by using the five lower mast
sections, the lower adapter assembly, and
three upper mast sections fitted together
to mark the guy stake location. 6. Drive the
four guy stakes at a 45 degree angle into the
earth facing away from the mast.
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INSTALLATION INSTRUCTIONS

• B. Assembling antenna equipment. (If assembly is
  not to raised to its full
• height, the lower and upper adapter
  assemblies must be used.)
• 1. Assemble five lower mast sections by
  inserting the keyed male ends
• into the keyed female ends.
• 2. Place the bottom section of the assembly over
  the movable portion of
• the mast and base assembly.
• 3. Slide the guy plate, color coded blue, onto
  the male end of the lower
• adapter assembly. Assemble the lower adapter
  assembly to the five
• lower mast sections.
• 4. Assemble five upper mast sections and join
  them with the six already
• assembled.
• 5. Slide a guy plate, color coded red, onto the
  male end of the upper
• adapter assembly. Assemble the upper adapter
  assembly to the mast.
• 6. Turn the guy plates so that one hole of each
  is uppermost.
• 7. Attach the guy hooks, color coded blue, of
  the four lower guy ropes to
• the holes of the lower guy plate.

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INSTALLATION INSTRUCTIONS
8. Extend the guy ropes to the anchor assemblies
and attach the free end guy loop of the guy
snubber to the anchor hooks. When attached this
way, each guy rope can be pulled as taut as
desired by lengthening the guy loop. 9.
Attach the upper four guys, color coded red, to
the red guy plate and anchor assemblies in a
similar manner. 10. Pull the four guy ropes (two
upper and two lower) taut a secure them. The
method for pulling guy lines taut is as follows
A. Remove guy from snubber lock. B. Pull
snubber along guy in direction towards mast.
C. Secure guy by looping guy under snubber. 11.
Lay the two bottom (lower and upper) guy ropes
along one set of taut side guy ropes and
adjust to the same length. Attach the bottom guy
ropes to the back guy stake. 12. Coat the
insulating extension screw thread with
anticorrosion compound (silicone). Screw the
insulating extension into the feedcone structure
(handtight only) and assemble to the mast.
Do not use unusual force. 13.Coat the screw
threads of the AB-24, MS-117A and MS-116A with
anticorrosion compound. Assemble the antenna
elements by screwing together six sets of mast
sections, AB-24, MS-117A and MS-166A in each
section.

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CONCLUSION
SUMMARY
TASK Prepare the OE-254/GRC for installation.
Inventory parts, components and running spare
parts making sure all necessary safety equipment
is on hand. Erect antenna to standard.