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1、 NAVWEPS 16-30ARC5-501 Handbook BENCH TEST And ALIGNMENT PROCEDURE RADIO EQUIPMENT AN/ARC-5 PUBLISHED BY DIRECTION OF THE CHIEF OF THE BUREAU OF NAVAL WEAPONS 1 October 1949 TABLE OF CONTENTS SECTION I INTRODUCTION 1-1. PURPOSE OF BENCH MAINTENANCE PROCEDURE. 1-4. DESCRIPTION OF PROCEDURE. 1-6. USE
2、OF THE PROCEDURE. 1-11. GENERAL DESCRIPTION OF AN/ARC-5 EQUIPMENT. 1-14. TEST EQUIPMENT. SECTION II PERFORMANCE CHECKS 2-1. GENERAL. 2-4. RECEIVER CHECKS. 2-9. BAND NOISE. 2-12. SENSITIVITY. 2-15. SELECTIVITY. 2-17. AVC CHARACTERISTICS. 2-21. TRANSMITTER CHECKS. 2-26. TRANSMITTER TRACKING AND LOADIN
3、G. 2-29. MODULATION CHECK. SECTION III ALIGNMENT PROCEDURE 3-1. RECEIVER ALIGNMENT. 3-6. TRANSMITTER ALIGNMENT. SECTION IV TROUBLE ISOLATION 4-1. RADIO RECEIVER. 4-4. AUDIO-FREQUENCY CIRCUIT. 4-6. INTERMEDIATE-FREQUENCY CIRCUIT. 4-8. CONVERTER CIRCUIT. (Follow chart below). 4-10. RADIO-FREQUENCY CIR
4、CUIT. 4-11. ANTENNA CIRCUIT. 4-12. TRANSMITTER AND MODULATOR. 4-15. OSCILLATOR. 4-16. FINAL AMPLIFIER. 4-17. MODULATOR. Figure 1-1. AN/ARC-5 Equipment SECTION I INTRODUCTION 1-1. PURPOSE OF BENCH MAINTENANCE PROCEDURE. 1-2. The basic approach used in the development of this manual has been that of d
5、ividing all equipments into two categories: a. Components operating at or above a minimum standard of satisfactory performance. b. Defective or poorly performing components. 1-3. Bench maintenance is reduced, first, to determining whether or not an equipment is operating satisfactorily, and, second,
6、 repairing the equipment if it is found to be defective. This division results in a procedure having four sections: a. INTRODUCTION - This section presents a brief description of the basic function of the subject equipment, its primary power requirements, inter-unit connecting cables, a suggested be
7、nch mock-up, and other information necessary for quick reference with respect to proper maintenance techniques. b. PERFORMANCE CHECKS - These are of primary importance and are to be performed in sequence upon the subject equipment. An equipment that meets all the requirements of this series of check
8、s is thereby determined to be satisfactory. An equipment that fails in any one of several of the check requirements is assigned, by means of proper references, to the appropriate steps in one or both of the two sections described below. c. ALIGNMENT - This section details the steps necessary to retu
9、rn the equipment to a properly aligned condition. Practical methods requiring a minimum of maintenance time are employed. d. TROUBLE ISOLATION - This section of the procedure is divided into sections, each of which deals with a specific component, stage or stages according to the function of the equ
10、ipment. When the maintenance technician is referred to a section of TROUBLE ISOLATION by the failure of the equipment to meet the standards set up in PERFORMANCE, he will find detailed instructions and data pertinent to the function. Additional aids in the form of sectional schematics and suggested
11、testing techniques are at his fingertips. This eliminates time-consuming manual searching, thus increasing the work output and efficiency of the technician. 1-4. DESCRIPTION OF PROCEDURE. 1-5. The procedure begins with a general description of the appearance, function, and operational characteristic
12、s of the AN/ARC-5 Communications Equipment. It is followed by a block diagram, list of test equipment and tools, and other necessary information. The procedure proper consists of PERFORMANCE CHECKS, ALIGNMENT, and TROUBLE ISOLATION sections, each of these making use of pictorial diagrams, photograph
13、s, and sectional schematics. These aids are related to the written material by means of three types of symbols: a. A star-encircled letter indicates a MAJOR CHECK POINT, at which satisfactory PERFORMANCE can be most easily determined. b. An encircled numeral indicates SECONDARY CHECK POINT, at which
14、 more detailed circuit information such as voltage readings and waveforms, can be obtained for trouble analysis. c. C-49 - Manufacturers circuit symbols, used to cross-reference all diagrams with the written material. 1-6. USE OF THE PROCEDURE. 1-7. The proper procedure to follow in bench maintenanc
15、e work is that given by the sequence of the PERFORMANCE CHECKS. These checks follow an order which will most quickly reveal the proper or improper performance of the equipment. 1-8. The failure of the equipment to meet one of these checks suggests the need for ALIGNMENT, or TROUBLE ISOLATION, and ap
16、propriate references are made. 1-9. When the reason for defective operation is found and the defect has been corrected, the technician is directed to return to the PERFORMANCE section, repeat the step at which defective operation was first noted, and, if PERFORMANCE is satisfactory, to continue with
17、 the remainder of the PERFORMANCE CHECKS. 1-10. Satisfactory completion of the last PERFORMANCE CHECK completes the bench maintenance for the equipment. 1-11. GENERAL DESCRIPTION OF AN/ARC-5 EQUIPMENT. 1-12. The model AN/ARC-5 Aircraft Radio Communication Equipment (See figure 1-1.) is a multi- chan
18、nel radio transmitter and receiver for use on aircraft having a 22 to 30-volt d-c power supply. The receivers cover a frequency range of 190 kc to 9.1 mc in five independent units, each unit designed to be mounted interchangeably into the receiver racks. Racks are available for either two, and/or th
19、ree- unit installations, the receivers operating singly or simultaneously, depending upon requirements. Provisions have been made for either local or remote control, but only remote controls are furnished with the equipment. The receiver mounting racks will accommodate other rack types of equipment
20、such as the AN/ARR-2 Receiver and AN/ARC-5 VHF Transmitter-Receiver. These units will not be covered in this procedure. The weight of the equipment, less cables and mechanical linkages, is 23.6 pounds for a two-receiver installation and 55.2 for a three-receiver installation. 1-13. The receivers are
21、 designed for the reception of CW, MCW or VOICE modulation. Manual gain control is employed in conjunction with high level automatic gain control. The outputs of each receiver may be paralleled on one line to a single headset, or divided for double headset reception by more than one operator. A 600-
22、ohm headset is to be used with this equipment. A single antenna is used for all receivers and transmitters. The tuning dials are calibrated directly in mc and their accuracy is better than 0.5 per cent. The transmitters cover the frequency range of 2.1 to 9.1 mc in five independent units. They are d
23、esigned to be installed in pairs. The transmitter frequency control dial is calibrated in megacycles with an accuracy of .03 per cent or better. A crystal calibrator is used in conjunction with an electron resonance indicator to spot-check the dial calibrations of each unit. The current drain from t
24、he d-c power source is 8.8 amperes when transmitting with CW emission, and is reduced to 2.5 amperes on stand-by. The carrier power output varies between eight watts with VOICE modulation to 25 watts with CW emission. Figure 1-2. Receiver and Transmitter Block Diagrams 1-14. TEST EQUIPMENT. DESCRIPT
25、ION RECOMMENDED STANDARD ALTERNATE 1. Bench Test Set AN/GRM-1 AN/ARC-5 TEST BENCH HARNESS Stock No. RI6-R- 1047-25 2. Frequency Meter LM-13 LM Series 3. RF Signal Generator TS-413/U LP-5 4. Audio Signal Generator TS-382A/U HP-200C 5. Output Meter Weston 695 Daven OP-182 6. Voltmeter TS-352/U Simpson
26、 260 7. VTVM TS-375/U RCP 662 or RCA Voltohmyst 165 8. Oscilloscope TS 239/UP Dumont 241 9. Tube Tester Hickok 547 Hickok 545 or 540 1-15. One additional extension cable will be required for the bench test setup to record modulation wave forms in TROUBLE ISOLATION. It should be a two-conductor cable
27、 about six inches long attached to terminals 10 and 17 of plug 6962 (the plug that fits into modulator receptacle (J-77). The other end of the two wire extension cable is terminated in two insulated phone-tip jacks, properly identified as terminals I0 and 17 respectively. Note If the AN/ARC-5/ARR-2A
28、 Test Bench Harness, ASO stock No. R16-R-1047-25, is used in place of the AN/GRM-1, there will be an individual meter for each of the switch positions of the I-104-A and the TS-58/GRM-1. The chart below shows the corresponding meter for each of the switch positions on the I-104-A and the TS- 58/GRM-
29、1. Figure 1-3. Test Equipment Diagram I-104-A SWITCH POSITION TEST UNIT #7369 METERS LABELLED CIRCUIT I-104-A READING #7369 READING 1 INPUT VOLTAGE Input voltage from primary source. 56 28 V DC 2 INPUT CURRENT Total input current from the primary source. 14-17 1.4-1.7 A 3 PLATE VOLTAGE Plate supply
30、to 12SF7, 12SK7, and 12K8 tubes, and screen grid voltage on 12A6 tube. 46-50 230-250 V 4 SCREEN VOLTAGE Screen grid voltage to 12SF7, 12SK7 and 12K8 tubes. 38-50 76-100 V 5 CATHODE CURRENT Cathode current of R-F amplifier and 1st I-F amplifier tubes, type 12SK7s. 44-60 11-15 ma 6 None Basic movement
31、 of meter (50 micro-amperes) direct to-and- TEST METER binding posts on front panel of I-104-A. I-104- A. Insert jumper wire between these two posts to protect the meter movement. TS-58/GRM- 1 READING #9556 READING TS-58/GRM-1 SWITCH POSITION TEST UNIT #9556 METERS LABELLED CIRCUIT TONE CW TONE CW 1
32、 INPUT VOLTAGE Input voltage from primary source 54 54 27 27 2 SCREEN VOLTAGE Screen grid voltage to PA tubes 28-31 48- 60 140- 155 240- 300 3 PLATE VOLTAGE Plate voltage to final PA tubes 51-56 51- 55 510- 550 510- 550 4 OSC. PLATE CURRENT Plate current of master oscillator tube, type 1626 32-46 32
33、- 46 16-23 16- 23 ma 5 AMP. PLATE CURRENT Plate current of final PA tubes type 1625 27-40 60- 80 68- 100 150- 200 ma TEST SET COMPONENTS TYPE QTY DESIGNATION ARMY NAVY USE 1 Antenna A-61-A Phantom antenna (LF, MF, HF radio transmitter) 1 ANT. Relay Unit BC-442-A RE-2/ARC-5 Antenna relay (LF, MF, HF
34、radio transmitter) 1 Control Unit C-29/ARC-5 Transmitter control (or C- 30A/ARC-5) 1 C-43/ARC-5 Receiver control 3 MC-237 Local tuning crank 1 Cord CD-525 DC Outlet to modulator 2 CD-527 6-Conductor 1 CD-528 5-Conductor 2 CD-531 DC Outlet to receiver rack (2- Conductor) 2 CD-532 8-conductor 1 CD-706
35、 Receiver Rack adapter (7- Conductor) 1 CD-905 Sidetone test 2 CX-31/GRM-1 12-Conductor 1 CX-32/GRM-1 18-Conductor 1 CX-33/GRM-1 Transmitter rack adapter (7- Conductor) 6 Diagram Instructions for test equipment AN/GRM-1 1 Dynamotor DM-33-A DY-8/ARC-5 Dynamotor (transmitting) 1 Modulator MD-7/ARC-5 M
36、odulator equipped with tubes 1 Mounting Base FT-279-A MT-62/ARC-5 Mounting for MT-63/ARC-5 or FT-277-A Receiver rack 1 FT-227-A MT-70/ARC-5 Mounting for MT-71/ARC-5 Radio transmitter rack 1 FT-225-A MT-76/ARC-5 Mounting (modulator) 1 FT-229-A MT-77/ARC-5 Mounting (antenna relay unit) 1 Mounting Plat
37、e FT-228-A MT-80/ARC-5 Mounting (transmitter control C-29/ARC-5 or C-50A/ARC-5) 1 FT-222-A MT-98/ARC-5 Mounting (Receiver control C- 43/ARC-5) 1 Mounting Rack FT-277-A MT-63/ARC-5 Rack for two radio receivers 1 MT-71/ARC-5 Rack for two radio transmitters 1 Test Unit I-104-A Test unit for radio recei
38、vers 1 TS- 58/GRM-1 Test unit for radio transmitters 1 Cord CD-307-A Headset extension cord 1 Microphone RS-38A Microphone 1 Headset HS-33 600-ohm headset (two ANB- H-1 receivers or equivalent) Figure 1-4. Cable Assemblies CD 532 and CD 528 Figure 1-5. Cable Assemblies CD 531 and CD 525 Figure 1-64.
39、 Cable Assemblies CX-31/GRM-1 and CS-32/GRM-1 Figure 1-74. Cable Assembly CD 527 NOTES 1. If Antenna relay unit RE-2/ARC-5, being tested, does not have a series capacitor, connect the transmitter to TRANS. Connect ANT of the antenna relay unit to terminal A, instead of to terminal 5, of antenna A-61
40、-A. 2. Test Unit I-104-A normally is used with adapter cord CD-706 as shown. It may be used by attaching cord CD-532 to either position of the receiver rack and when so employed, the meter will not indicate when the meter switch is in position four or five. Volume control on AVC directly affects sid
41、etone level. 3. The drawing shows the mechanical linkage (Part No. 6151) so that the mechanical tuning features of the control units C-26 and C-43/ARC-5 and radio receivers R-20 to R-27/ARC-5 may be tested. No linkage is furnished with the test equipment. Control unit MC-257 (local tuning crank) is
42、furnished for testing these receivers. 4. Test unit I-104-A may be made to function as a control unit and provide the channel selection when testing VHF radio receiver R-28/ARC-5, by connecting cord CD-527 between jack J-103 on the radio receiver and jack J-600 on the test unit. 5. Dynamotors *DY-2/
43、ARR-2 and *DY-2A/ARR-2 are furnished with the particular radio receivers as shown. Both dynamotors are interchangeable with dynamotors DM-32-A or CBY-21531. 6. Transmitters and receivers may be tested either by direct connection to the test equipment, using cords CX-33/GRM-1 and CD-706, or by mounti
44、ng in a one or two unit rack and using cords CX- 31/GRM-1 and CD-532. SECTION II PERFORMANCE CHECKS 2-1. GENERAL. 2-2. These PERFORMANCE CHECKS are to be made in the order given; when a performance requirement is not met, a reference is made to the appropriate voltage measurement or signal tracing p
45、rocedure in TROUBLE ISOLATION. ALIGNMENT PROCEDURES are included, but are to be used only as directed in TROUBLE ISOLATION. Signal tracing techniques are used after voltage readings have been found to be normal. The standard maintenance manual should be referred to for detailed information concernin
46、g the AN/ARC-5 Equipment. Note Receiver and transmitter PERFORMANCE CHECKS are divided as shown in the TABLE OF CONTENTS. 2-3. VISUAL CHECKS. Connect the unit to be checked on the Test Set AN/GRM-1 rack and inspect the unit for the following: l. Faulty plugs, threads and pins. 2. Improper fusing. 3.
47、 Note evidence of excessive dynamotor ripple at the headset while tuning through the frequency band. 4. Dirty and chattering antenna relay contacts. 5. Excessive vibration of the unit in rack. Note Open filaments can sometimes be detected by noting cold tubes. 2-4. RECEIVER CHECKS. 2-5. D-C POWER SU
48、PPLY AND OPERATING VOLTAGES. 2-6. LIMITS: Input voltage is 27.5 volts dc at 1.7 amps. Secondary voltage is 230-250 volts dc at 60 ma. 2-7. PRELIMINARY INSTRUCTIONS: Use Test Set AN/GRM-1, as shown in figure 1-3. Use Optional Wiring for greater ease in maintenance testing. Do not key the transmitter. Apply d-c power and turn the CONTROL SWITCH of Test Set I-104-A to MCW position, allowing the equipment time to warm up. Do not remove the cover plates until trouble isolation or alignment is indicated by performance
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