CU-1658_CU-1669_antenna_coupler_serv2_TM11-5985-326-20_1970.pdf

TM 11-5985-326-20 D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L ORGANIZATIONAL MAINTENANCE MANUAL COUPLER ANTENNA CU-1658/A AND CU-1669/GRC H E A D Q U A R T E R S , D E P A R T M E N T O F T H E A R M Y NOVEMBER 1970 TM 11-5985-326-20 WARNING DANGEROUS VOLTAGES are used in the operation of this equipment. DEATH ON CONTACT may result if safety precautions are not observed. Electrical potentials up to 400 volts dc exist in the receiver-transmitter to which the antenna coupler is connected when the radio set is energized. Do not make contact with exposed wires or connectors when the equipment is energized. WARNING Operator and maintenance personnel should be familiar with the requirements of TB SIG 291 before attempting installation or operation of the equipment covered in this manual. Failure to follow the requirements of TB SIG 291 could result in injury or DEATH. WARNING The metal case handle of the antenna coupler in the extended carry or pull-out position is close to the output terminal. A short circuit is possible through the case whenever the antenna lead-in wire is connected to the output terminal and the handle is not in the down position. TM 11-5985-326-20 This manual contains copyrighted material owned by Collins Radio Company TECHNICAL MANUALHEADQUARTERS DEPARTMENT OF THE ARMY No. 11-5985-326-20WASHINGTON, D.C., 17 November 1970 Organizational Maintenance Manual COUPLER, ANTENNA CU-1658/A and CU-1669/GRC ParagraphPage CHAPTER1.INTRODUCTION Section I.General Scope.1-11-1 Indexes of publications .1-21-1 Forms and records .1-31-1 II.Description and Data Use of term hertz.1-41-1 Purpose and use.1-51-2 Technical characteristics.1-61-2 Components and dimensions.1-71-2 Nomenclature and common names.1-81-2 Description of equipment .1-91-2 Additional equipment required.1-101-3 Difference in models.1-111-3 System application.1-121-3 CHAPTER2.INSTALLATION General.2-12-1 Siting.2-22-1 Checking unpacked equipment.2-32-1 Interconnection procedures.2-42-1 Receiver-Transmitter, Radio RT-648/ARC-94 installation.2-52-2 Receiver-Transmitter, Radio RT-698/ARC-102 installation .2-62-2 3.OPERATION Section I.Operating Controls and Indicators Controls.3-13-1 Indicators.3-23-1 II.Operation Under Usual Conditions General.3-33-2 Starting procedures.3-43-2 Stopping procedures.3-53-2 CHAPTER4.ORGANIZATIONAL MAINTENANCE Section I.General Scope of maintenance.4-14-1 Tools, test equipment, and materials required.4-24-1 II.Preventive Maintenance General .4-34-1 Intermediate preventive maintenance checks and services.4-44-1 Intermediate preventative maintenance checks and services chart.4-54-2 Cleaning .4-64-2 Preservation .4-74-2 Periodic preventive maintenance checks and services.4-84-2 Periodic preventive maintenance checks and services chart .4-94-2 III.Organizational Troubleshooting General.4-104-3 Troubleshooting.4-114-3 *This manual supersedes so much of TM 11-5821-271-15, 6 March 1967; including all changes as pertains to organizational maintenance procedures. i TM 11-5985-326-20 Paragraph Page Section IV. Removal and Replacement Antenna coupler removal . 4-12 4-4 Antenna coupler replacement . 4-13 4-4 Indicator lamp removal . 4-14 4-4 Indicator lamp replacement. 4-15 4-4 CHAPTER 5. SHIPMENT, LIMITED STORAGE, AND DEMOLITION TO PREVENT ENEMY USE Shipment. 5-1 5-1 Limited storage. 5-2 5-1 Authority for demolition. 5-3 5-1 Methods of destruction. 5-4 5-1 6. ILLUSTRATIONS General . 6-1 6-1 List of illustrations. 6-2 6-1 APPENDIX A. .REFERENCES. A-1 B. MAINTENANCE ALLOCATION . B-1 LIST OF ILLUSTRATIONS Page Figure No. Title No. 1-1 Couplers, Antenna CU-1658/A and CU-1669/GRC, less mounting. iv 1-2 Couplers, Antenna CU-1658/A and CU-1669/GRC, outline and mounting dimensions. 1-3 1-3 Basic hf communications system, block diagram . 1-4 3-1 Couplers, Antenna CU-1658/A and CU-1669/GRC, indicators. 3-1 6-1 Receiver-Transmitter, Radio RT-648/ARC-94, Control, Radio Set C-4626/ARC-102, and Coupler, Antenna CU-1669/GRC, cabling diagram. 6-3 6-2 Receiver-Transmitter, Radio RT-648/ARC-94, Control, Radio Set C-4626/ARC-102, and Coupler, Antenna CU-1658/A, cabling diagram. 6-5 6-3 Receiver-Transmitter, Radio RT-648/ARC-94, Control, Radio Set C-3940/ARC-94, and Coupler, Antenna CU-1669/GRC, cabling diagram -. 6-7 6-4 Receiver-Transmitter, Radio RT-648/ARC-94, Control, Radio Set C-3940/ARC-94, and Coupler, Antenna CU-1669/GRC, cabling diagram (dual system). 6-9 6-5 Receiver-Transmitter, Radio RT-648/ARC-94, Control, Radio Set C-3940/ARC-94, and Coupler, Antenna CU-1658/A, cabling diagram -. 6-11 6-6 Receiver-Transmitter, Radio RT-698/ARC-102, Control, Radio Set C-4626/ARC-102, and Coupler, Antenna CU-1669/GRC, cabling diagram -. 6-13 6-7 Receiver-Transmitter, Radio RT-698/ARC-102, Control, Radio Set C-4626/ARC-102, and Coupler, Antenna CU-1658/A, cabling diagram -. 6-15 6-8 Receiver-Transmitter, Radio RT-698/ARC-102, Control, Radio Set C-3940/ARC-94, and Coupler, Antenna CU-1669/GRC, cabling diagram -. 6-17 6-9 Receiver-Transmitter, Radio RT-698/ARC-102, Control, Radio Set C-3940/ARC-94, and Coupler, Antenna CU-1658/A, cabling diagram. 6-19 ii TM 11-5985-326-20 A. COUPLER, ANTENNA CU-1658/A Figure 1-1. Couplers, Antenna CU-1658/A and CU-1669/GRC, less mounting. iv TM 11-5985-326-20 CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1. Scope a.This manual describes Couplers, Antenna CU- 1658/A and CU-1669/GRC (fig. 1-1) and covers its installation, operation, and maintenance. It includes operation under usual conditions, cleaning and inspection of the equipment, and replacement of parts available to second echelon maintenance. b.The maintenance allocation chart (MAC) is in appendix B. 1-2. Indexes of Publications a.DA Pam 310-4. Refer to the latest issue of DA Pan 310-4 to determine whether there are new editions, changes, or additional publications pertaining to this equipment. b.DA Pam 310-7. Refer to DA Pam 310-7 to determine whether there are modification work orders (MWOs) pertaining to the equipment. DA Pam 310-7 lists all authorized Department of the Army modification work orders, identifying the type, model, series, and Federal stock number of the item to be modified; number, date, and classification of the MWO; category of maintenance authorized to perform the modification; and the man-hours required to apply the modification to each item. 1-3. Forms and Records a.Reports of Maintenance and Unsatisfactory Equipment. Use equipment forms and records in accordance with instructions given in TM 38750. b.Report of Packaging and Handling Deficiencies. Fill out and forward DD Form 6 (Report of Packaging and Handling Deficiencies) as prescribed in AR 700-58 (Army), NAVSUP Publication 378 (Navy), AFR 71-4 (Air Force), and MCO P4610-5 (Marine Corps). 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 (Army), NAVSUP Publication 459 (Navy), AFM 75-34 (Air Force) and MCO P4610.19 (Marine Corps). d.Reporting of Equipment Manual Improvements. Reporting of errors, omissions, and recommendations for improving this manual by the individual user is encouraged. Report should be submitted on DA Form 2028 (Recommended Changes to Publications) and forwarded direct to Commanding General, U.S. Army Electronics Command, ATTN: AMSEL-ME-NMP-EM, Fort Monmouth, N.J. 07703. Section II. DESCRIPTION AND DATA 1-4. Use of Term Hertz The National Bureau of Standards has officially adopted the term Hertz (abbreviated Hz) for cycles per second (abbreviated cps). The table below provides the common equivalents. The term Hertz is used throughout this manual except where equipment markings or decals reflect the old term. Unit/ quantityOld termOld abbrNew termNew abbr Frequency.Cycles per second.cpsHertzHz 10-3 cycle per second . Millicycles per second.mcMillihertzmHz 103 cycles per second.Kilocycles per second .KcKilohertzkHz 106 cycles per second. Megacycles per second.McMegahertzMHz 109 cycles per second .Gigacycles per second.GcGigahertzGHz 1-1 TM 11-5985-326-20 1-5. Purpose and Use a.Purpose. The purpose of Couplers, Antenna CU-1658,/A and CU-1669i/GRC is to electrically match the impedance of a whip antenna (25 feet or longer) or a long wire antenna (25 to 100 feet) with a 50-ohm coaxial transmitter output line. b.Use. Couplers, Antenna CU-1658/A and CU- 1669,/GRC are high frequency (hf) antenna couplers covering the frequency range of 2.000 to 29.999 MHz. They are automatically tuned in 3 seconds when a new frequency is selected, using any high frequency radio set such as Receiver-Transmitter, Radio RT- 698,/ARC-102. Coupler, Antenna CU-1658/A is employed for airborne use; Coupler, Antenna CU- 1669,/GRC is employed for ground use. The antenna couplers will match a whip antenna of 25 feet or longer, or a long wire antenna between 25 and 100 feet. Antennas shorter than 25 feet may also be matched with the aid of external loading coils. 1-6. Technical Characteristics Frequency range.2.000 to 29.999 MHz Power requirements.115 volts ac (vac), single phase, 400 Hz. Power consumption.130 watts maximum during tuning; 20 watts during operate. Duty cycle.Continuous Rated input radio- frequency (rf) power.630 watts peak envelope power (pep); 200 watts average. Tuning time.3.0 seconds, typical 5.0 seconds, maximum Tuning accuracy.1.3 to 1 voltage standing- wave ratio (vswr) maximum for all operating conditions when tune power is greater than 70 watts. Receiver-transmitter compatibility.Completely compatible with Receiver- Transmitter, Radio RT- 648/ ARC-94; Receiver- Transmitter, Radio RT- 698/ARC-102; and Receiver-Transmitter, Radio RT-311/ARC-38. Ambient temperature: Operating.-55 degrees C (-67 degrees F) to 71 degrees C (159.8 degrees F). Nonoperating .62 degrees C ( -79.6 degrees F) to 85 degrees C (185 degrees F). Altitude.0 to 30,000 ft (9,100 meters) operating. Shock.15 G, 11-millisecond duration. Vibration .5 to 500 Hz, MIL-E-5400F (curve IV with vibration isolators and curve II nonoperating). 1-7.Components and Dimensions (fig. 1-2) a.Components. Couplers, Antenna CU-1658/A and CU-1669/GRC. b.Dimensions. Refer to figure 1-2. 1-8. Nomenclature and Comm