2 AGENDA ANTENNA GROUP OE-254/ GRC * PURPOSE * TASKS, CONDITIONS AND STANDARDS* DESCRIPTION* TECHNICAL CHARACTERISTICS* WARNING STATEMENTS* INSTALLATION INSTRUCTIONS* SUMMARY* HANDS ON EXERCISE
3 Antenna Group OE-254/GRC PURPOSE Provide in-depth training and evaluation in the installation of Antenna Group OE-254/GRC.
4 Install Antenna Group OE-254/GRC Tasks, Conditions and StandardsTASK: 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 , Aug 1978)STANDARDS: Soldiers will demonstrate ability to fully erect OE-254/GRC Antenna. (IAW TM , Aug 1978)
5 DescriptionOE-254/GRC* is an omni-directional, biconical antenna designed forbroadband operation without field adjustment from 30to 88 MHz frequency range up to approximately 500 watts.The antenna system includes:O A standard lightweight mast having a maximum heightof 41 feet and 9 inches.O A canvass carrying bag with assembly and erectionprocedures.O All necessary guy assemblies, stakes, base plate,tools, and other ancillary equipment required to makea complete antenna system.O All necessary coaxial cables and cable adapters.
6 Technical Characteristics Frequency Range to 88 MHzRF power capability watts nominalDistance Range (nominal) when used with radio sets (on high power) except theAN/PRC series:Between two AntennasGroup OE-254/GRCAverage terrain miles (57.9 km)Difficult terrain miles (48.3 km)Between AntennaGroup OE-254/GRC and vehicular whip antenna:Average terrain miles (48.3 km)Difficult terrain miles (40.3 km)Distance Range (nominal) using Radio Sets AN/PRC:Between two Antenna Groups OE-254/GRC miles (19.3 km)Between whip antenna and Antenna OE-254/GRC miles (12.9 km)
7 Technical Characteristics Antenna erection time (2 persons) minutesErected height (nominal) ft, 9 in. (12.7 meters)Input impedance to radio (nominal) ohmsType of radiation pattern NondirectionalWeight (packed) lbs 8 oz (19.73 kg)
8 TAKE IN CONSIDERATION: WARNING STATEMENTTAKE IN CONSIDERATION:- DISTANCE- TRANSMISSION- WEATHER
9 INSTALLATION INSTRUCTIONS A. Positioning baseplate and guy stakesB. Assembling antenna equipmentC. Assemble the antennaD. Erection using two personsE. Lowering the antenna
10 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 thebaseplate 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 mastsections, the lower adapter assembly, and three upper mast sections fitted togetherto mark the guy stake location.6. Drive the four guy stakes at a 45 degree angle into the earth facing away from the mast.
11 INSTALLATION INSTRUCTIONS B. Assembling antenna equipment. (If assembly is not to raised to its fullheight, the lower and upper adapter assemblies must be used.)1. Assemble five lower mast sections by inserting the keyed male endsinto the keyed female ends.2. Place the bottom section of the assembly over the movable portion ofthe mast and base assembly.3. Slide the guy plate, color coded blue, onto the male end of the loweradapter assembly. Assemble the lower adapter assembly to the fivelower mast sections.4. Assemble five upper mast sections and join them with the six alreadyassembled.5. Slide a guy plate, color coded red, onto the male end of the upperadapter 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 tothe holes of the lower guy plate.
12 INSTALLATION INSTRUCTIONS 8. Extend the guy ropes to the anchor assemblies and attach the free endguy loop of the guy snubber to the anchor hooks. When attached thisway, each guy rope can be pulled as taut as desired by lengthening theguy loop.9. Attach the upper four guys, color coded red, to the red guy plate andanchor 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 tautside guy ropes and adjust to the same length. Attach the bottom guyropes 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) andassemble to the mast. Do not use unusual force.13.Coat the screw threads of the AB-24, MS-117A and MS-116A with anticorrosioncompound. Assemble the antenna elements by screwing together six sets of mastsections, AB-24, MS-117A and MS-166A in each section.
13 CONCLUSIONSUMMARYTASK: 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.