AS-2731_antenna_serv_user_TM11-5985-355-13_1978.pdf

TM 11-5985-355-13 TECHNICAL MANUAL OPERATORS, ORGANIZATIONAL, AND DIRECT SUPPORT MAINTENANCE MANUAL ANTENNA AS-2731/GRC (NSN 5985-01-017-0785) This copy is a reprint which includes current pages from Changes 1 and 2. HEADQUARTERS, DEPARTMENT OF THE ARMY APRIL 1978 TM 11-5985-355-13 WARNING Operator and maintenance personnel should be familiar with the requirements of TB SIG 291 before attempting installation or operation of the equipment. Failure to follow the requirements of TB SIG 291 could result in injury or DEATH. WARNING Dangerous rf voltages exist at all metal surfaces above plastic base insulator, including spring mount and lower ferrule of whip, when the radio is transmitting. WARNING DO NOT tie down the whip on a vehicle because of possible serious injury to personnel. TM 11-5985-355-13 C2 CHANGEHEADQUARTERS DEPARTMENT OF THE ARMY No. 2WASHINGTON, DC, 30 July 1982 Operators, Organizational, and Direct Support Maintenance Manual ANTENNA AS-2731/GRC (NSN 5985-01-017-0785) TM 11-5985-355-13, 12 April 1978, is changed as follows: 1. New or changed material is indicated by a vertical bar in the margin of the page. 2. Added or revised illustrations are indicated by a vertical bar in front of the figure caption. 3. Remove and insert pages as indicated below: RemoveInsert i and ii. i and ii 1-1 through 1-3 . 1 through 1-4 2-1 and 2-2. 2-1 and2-2 3-1 and 3-2. 3-1 and3-2 4-1 through 4-5 . 4-1 through 4-5 6-1 through 6-7 . 6-1 through 6-7 A-1 and A-2. A-1 and A-2 B-1 andB-2. B-1 andB-2 C-3 and C-4 . C-3 and C-4 E-1 and E-2. E-1 and E-2 Figure FO- 1. Figure FO-1 4. File this change sheet in front of the publication for reference purposes. By Order of the Secretary of the Army: E. C. MEYER Official:General, United States Army Chief of Staff ROBERT M. JOYCE Brigadier General, United States Army The Adjutant General Distribution: To be distributed in accordance with DA Form 12-51, Operator, requirements for ANVRC-12, AN VRC-43 Thru 49, AN/VRC-64 and AN/GRC- 160. TM 11-5985-355-13 WARNING SERIOUS INJURY OR EVEN DEATH CAN HAPPEN IF THE FOLLOWING ARE NOT CAREFULLY OBSERVED WHEN INSTALLING AND USING THE ANTENNAS USED WITH YOUR RADIO SETS. IF POSSIBLE, TRY TO MAINTAIN MOBILE COMMUNICATIONS WITH YOUR ANTENNA(S) TIED DOWN. MAKE SURE AN ANTENNA TIP CAP IS SECURELY TAPED ON THE END OF EACH WHIP ANTENNA. DO NOT LEAN AGAINST OR TOUCH A WHIP ANTENNA WHILE THE TRANSMITTER IS ON. DURING CROSS-COUNTRY OPERATION, DO NOT ALLOW ANYONE TO STICK AN ARM, LEG OR WEAPON OVER THE SIDES OF THE VEHICLE. IF YOUR ANTENNA ACCIDENTALLY TOUCHES A POWERLINE AND A LEG, ARM OR WEAPON CONTACTS A DAMP BUSH OR THE GROUND, A SERIOUS OR FATAL ACCIDENT CAN HAPPEN. IF YOU ARE NOT SURE THAT AN ANTENNA ON YOUR VEHICLE WILL CLEAR A POWERLINE, STOP BEFORE YOU GET CLOSE TO THE POWERLINE AND EITHER CAREFULLY TIE DOWN THE ANTENNA OR REMOVE ANTENNA SECTIONS TO MAKE SURE THAT YOU CAN SAFELY DRIVE UNDER THE POWERLINE. Change 1 0-i TM 11-5985-355-13 Change 1 0-ii TM 11-5985-355-13 TECHNICAL MANUAL. HEADQUARTERS DEPARTMENT OF THE ARMY No. 11-5985-355-13 WASHINGTON, DC, 12 April 1978 OPERATORS, ORGANIZATIONAL, AND DIRECT SUPPORT MAINTENANCE MANUAL ANTENNA AS-2731 /GRC (NSN 5985-01-017-0785) REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form (Recommended Changes to Publications and Blank Forms), or DA Form 2028 2 located in the back of this manual direct to Commander, US Army Communications-Electronics Command, ATTN: DRSEL- ME MQ, Fort Monmouth, NJ 07702. In either case, a reply will be furnished direct to you. Paragraph Page CHAPTER 1. INTRODUCTION SECTIONI. General Scope. 1-1 1-1 Index of technical publications. 1-2 1-1 Maintenance forms, records and reports . 1-3 1-1 Destruction of Army electronics material . 1-4 1-1 Administrative storage. 1-5 1-1 Reporting equipment improvement recommendations (EIR). 1-5.1 1-1 SECTIONII. Description and data Purpose and use. 1-6 1-2 Tabulated data. 1-7 1-2 Description. 1-8 1-2 CHAPTER 2. INSTALLATION AND OPERATION SECTIONI. Service upon receipt of equipment Checking unpacked equipment. 2-1 2-1 Siting. 2-2 2-1 Installation instructions. 2-3 2-1 SECTIION II. Operating instructions Operators control and connectors. 2-4 2-5 Operating procedure. 2-5 2-5 CHAPTER 3. OPERATOR CREW MAINTENANCE Scope of operators maintenance . 3-1 3-1 Materials required . 3-2 3-1 Operators crew preventive maintenance. 3-3 3-1 Preventive maintenance checks and services periods. 3-4 3-1 Cleaning. 3-5 3-2 CHAPTER 4. ORGANIZATIONAL MAINTENANCE Scope of organizational maintenance. 4-1 4-1 Test equipment, tools and materials required. 4-2 4-1 Organizational preventive maintenance checks and services (PMCS) . 4-3 4-1 Touchup painting. 4-4 4-1 Organizational maintenance troubleshooting procedures. 4-5 4-1 Repair procedures: General. 4-6 4-2 Antenna Element AS- 2732 GRC removal and replacement. 4-7 4-2 Matching Unit-Base MX-9146 GRC removal and replacement . 4-8 4-4 Using Test Set, RF Power AN URNI-182 with AS-2731 GRC. 4-9 4-4 Painting. 4-10 4-4 CHAPTER 5. CIRCUIT ANALYSIS General . 5-1 5-1 Matching Unit-Base MX 9146 GR. 5-2 5-1 Change 2 i TM 11-5985-355-13 ParagraphPage CHAPTER 6.DIRECT SUPPORT MAINTENANCE INSTRUCTIONS SECTIONI.Troubleshooting Scope of direct support maintenance .6-16-1 Tools, test equipment, and materials required.6-26-1 Direct support maintenance troubleshooting .6-36-1 SECTIONII.Repair procedures General .6-46-1 Special precautions.6-56-1 Antenna Element AS-2732 GRC parts removal and replacement.6-66-1 Matching Unit-Base NlIX 9146 GRC parts removal and replacement.6-76-2 Antenna performance test.6-86-7 APPENDIX A.REFERENCES.A-1 APPENDIX B.COMPONENTS OF END ITEM LIST SECTIONI.Introduction .B-1 SECTIONII.Integral Components of End Item .B-2 APPENDIX C.MAINTENANCE ALLOCATION SECTIONI.Introduction .C-1 SECTIONII.Maintenance Allocation Chart.C-3 SECTIONIII.Tool and Test Equipment Requirements .C-4 SECTIONIV.Remarks.C-5 APPENDIX E.EXPENDABLE SUPPLIES AND MATERIALS LIST SECTIONI.Introduction .E-1 SECTIONII.Expendable Supplies and Materials List.E-2 LIST OF ILLUSTRATIONS FigureTitlePage 1-1Antenna AS-273 GRC, overall view, less restraint assembly.1-3 1-2Restraint assembly, installation.1-3 2-1Antenna siting locations, good and poor.2-2 2-2Antenna AS 2731 GRC, partial view, parts location.2-3 2-3NIX 9146 GRC, bottom view, installed in mounting bracket, parts location.2-4 2-4Tvpical bonding jumper setups .2-5 2-5Antenna AS 2731 GRC, control and connectors.2-6 4-1Typical receiver-transmitter test setup with AN URNI-182.4-5 6-1Antenna Element AS 2732 GRC. partial view, parts location.6-2 6-2Cable Mount Assembly, exploded view, parts location.6-3 6-3Matching Unit-Base MX 9146 GRC, side view, parts location with restraint assembly.6-5 6-4Matching Unit-Base MX-9146 GRC, case cover removed parts location .6-6 6-5Cable Assembly, Special Purpose MX-13055 GRC, schematic diagram.6-7 FO-1Matching Unit-Base MX 9146 GRC, schematic diagram .Back of Manual ii TM 11-5985-355-13 CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1.Scope a. This manual describes Antenna AS-2731 GRC and covers its installation, operation, and operators, organizational, and direct support maintenance. Detailed functioning of the AS-2731 GRC is covered in the circuit analysis chapter. Maintenance coverage is limited to those procedures that do not require operation of the AS- 2731 GRC as part of a specific communication system. b. The AS-2731 GRC is always used as part of a communication system. The information in this manual supplements the information given for the AS-2731 GRC in the technical manual for the radio set with which the AS-2731 GRC is used. c. Antenna AS-2731 GRC is usually mounted on vehicles. Mounting instructions will differ for the various vehicles on which the AS-2731 GRC is installed. Refer to SB 11 - 131 for the list of authorized vehicular radio sets and installation kits. d. The basic issue items list appears in appendix B, and the maintenance allocation chart appears in appendix C. 1-2.Index of Technical Publications Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertaining to the equipment. 1-3.Maintenance Forms, Records and Reports a. Reports of maintenance and Unsatisfactory Equipment. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by TM 38-750, The Army Maintenance Management System. b. Report of Packaging and Handling Deficiencies. Fill out and forward SF 364 (Report of Discrepancy (ROD) as prescribed in AR 735-11-2.DLAR 4140.55 NAVNMATINST4355.73 AFR 400-54 MICO 4430.3E. c. Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361 as prescribed in AR 55-38 NAVSUPINST4610.33B AFR75-18 MCO 4610.19C DL AR 4500.15. 1-4.Destruction of Army Electronics Materiel Administrative Storage of the AS-2731 GRC will be handled as follows. The requirements apply whether the antenna is stored as part of the vehicle, with an associated radio, or stored alone. a. If the AS-2731/GRC is removed from the vehicle, the mounting hardware should be stowed in a small bag attached to the MX-9146 GRC. Apply a layer of graphite grease (item 2, app F) to the screw threads to prevent rust. b. Before and after storage, perform the following: (1) Clean the unit (para 3-5) and spot-paint bare metal parts (para 4-4). (2) Perform quarterly PMSC (table 4-1). Correct all deficiencies. c. Store in dry, moisture-free area. Records and reports shall be maintained as prescribed in TM 38-750 for equipment in use. 1-5.1. Reporting Equipment Improvement Recommendations (EIR) If your AS-2731 GRC