TM 11-5821-277-20 TECHNICAL MANUAL ORGANIZATIONAL MAINTENANCE MANUAL RADIO SETS AN/ARC-134, AN/ARC-134A, and AN/ARC-134B HEADQUARTERS, DEPARTMENT OF THE ARMY AUGUST 1969 WARNING DEATH or SERIOUS INJURY may result from hazards in this equip- rnent unless proper safety measures are observed when maintaining the equipment. Electrical potentials up to 400 volts dc exist in Receiver-Trans- mitter RT-857/ARC-134 when the radio set is energized. Do not make contact with exposed wires or connectors when the equipment is ener- gized. Set the PWR switch to OFF and open the circuit breaker(s) which supply operating power to the equipment before making any connections or disconnections. DON’T TAKE CHANCES! *TM 11-5821-277-20 TECHNICAL. MANUAL. HEADQUARTERS DEPARTMENT OF THE ARMY No. 11-5821-277-20 WASHINGTON, D.C., 5 August 1969 Organizational Maintenance Manual RADIO SETS AN/ARC-134, AN/ARC-134A, AND AN/ARC-134B Paragraph Page CHAPTER 1. INTRODUCTION Section I. General Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-1 Indexes of publications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 1-1 Maintenance forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-1 Reporting of equipment publication improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3.1 1-1 Destruction of rnaterial to prevent enerny use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3.2 l-l Administrative storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3.3 l-l Use of term Hertz . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1-1 II Description and data Purpose and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . ... . . . . . . . . . . . .1-5 1-2 Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 1-3 Components and dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7 1-4 Nomenclature and common names . . . . . . . . . . . . . . . . . . .1-8 1-1 Description of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9 1-4 Additional eqipment required. . . . . . . . . . . . . . . . . . . . . . . . 1-10 1-5 Difference in models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11 1-5 CHAPTER 2. INSTALLATION General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2-1 Sitting requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-1 Packaging data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3 2-1 Unpacking instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4 2-1 Checking unpacked equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5 2-1 Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6 2-3 CHAPTER 3. OPERATION General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 3-l 3-1 Principles of operation . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . 3 -2 3-2 Operating procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3 3-2 Emergency operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 3-4 CHAPTER 4. ORGANIZATIONAL MAINTENANCE Section I. General 4-1 Scope of maintenance, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 Tools, test equipment, and materials required . . . . . . . . . . . . . . . . . . . . . . . 4-2 4-1 II. Preventive maintenance procedures Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4-1 Test procedure information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 4-2 Test procedures . . . . . . . . . . . . . . . . . . . . . . . 4-5 4-2 Intermediate preventive maintenance checks and services . . . . . . . . . . . . . . . . . . . . . .4-6 4-4 Intermediate preventive maintenance checks and services chart . . . . . . . . . . . . . . .4-7 4-4 Periodic preventive maintenance checks and services . . . . . . . . . . . . . . . . . . . . . .4-8 4-5 “This manual supersedes so much of TM 11-5821-277-25-1, 23 September 1986, Including changes, and so much of TM 11-5821-277-25-2, 7 July 1966, Including changes, as pertains to organizational maintenance. Change 3 i TM 11-5821-277-20 Periodic preventive maintenance and services chart . . . . . . . . . . . . . . . . . . . . . . . 4-9 4-6 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . .4-10 4-7 Repainting and refinishing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11 4-7 Section III. Troubleshooting General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12 4-7 Troubleshooting chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13 4-7 IV. Removal and replacement Control unit panel lump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14 4-9 Control unit control knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-15 4-9 Control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .4-16 4-10 Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-17 Resilient mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18 APPENDIX A. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1 B. MAINTENANCE ALLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Section I. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II. Maintenance allocation chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Change 3 F ig u re 1 -1 T M 1 1 1 Change C1-5821-2 77 1-0.1 -20 T M 1 -0.2 11 C C-5 ha 182 n 1 ge 1 -277 - 2 0 F ig u re 1 -1 .1 TM 11-5821-277-20 CHAPTER 1 INTRODUCTION Section 1. 1-1. scope Improvement Report) as prescribed in AR a. This manual describes Radio Set AN/ARC-134(A, B) 700-58/NAVSUPINST 4030.29/AFR 71-13/MCO (fig. 1-1) and includes instructions for installation and P4030.29A, and DSAR 4145.8. operation. The manual also covers organizational c. Discrepant in Shipment Report (DISREP) (SF maintenance, troubleshooting, cleaning and inspec- 361). Fill out and forward Discrepancy in Shipment tion of the equipment, and replacement of parts Report (DISREP) (SF 361) as prescribed in AR available to the organizational maintenance re- 55-38/NAVSUPINST 4610.33/AFM 75-18/MCO pairman. P461O.19A, and DSAR 4500.15. b. Nomenclature references in this manual fol- lowed by an (*) indicate that all models of equipment 1-3.1 Reporting of Equipment Pubication improvements are specified, For example, Radio Set AN/ARC-134(*) represents Radio Set AN/ARC-134, AN/ARC-134A, The reporting of errors, omissions, and recommenda- and AN/ARC-134B, Mounting MT-3791(*)/ARC-134 tions for improving this manual by the individual represents Mounting MT-3791/ARC-134, MT- user is encouraged. Report.. should be submittal on 3791A/ARC-134, MT-3791B/ARC-134, and MT- DA Form 2028 (Recommended Changes to Publica- 3791OARC-134. tions and Blank Forms) and forwarded direct to c. The maintenance allocation chart appears in Commander, US Army Electronics Command, appendix B. ATTN: AMSEL-MA-PSA Fort Monmouth, NJ 07703. 1-2. Indexes of Publications a. DA Pam 310-4. Refer to the latest issue of DA 1-3.2 Destruction of Materiel to Prevent Enemy Use Pam 310-4 to determine whether there are new editions, changes or additional publications pertain- For information on this subject, refer to TM ing to the equipment. 750-244-2 b. DA Pam 31O-T, Refer to DA Pam 310-7 to determine whether there are modification work 1-3.3 Administrative Storage orders (MWO’S) pertaining to the equipment . For procedures, forms and records, and inspection required during administrative storage of this 1-3. Maintenance Forms and Records equipment, refer to TM 740-91. a. Reports of Maintenance and Unsatisfactory 1-4. Use of Term Hertz Equipment. Maintenance forms, records, and reports which are to be used by maintenance personnel at all The National Bureau of Standards has officially maintenance levels are listed in and prescribed by adopted the term Hertz (Hz) to replace cycles per TM 38-750. second (cps). This technical manual uses the term Hz b Report of Packaging and Handling Deficiencies. in lieu of cps. The table below provides common Fill out and forward DD Form 6 (Packaging equivalents. Change 3 1-1 TM 11-5221-277-20 Section Il. DESCRIPTION AND DATA 1-5. Purpose and Use tronics bay of the aircraft. Control, Radio Set C- 7197/ARC-134 is on the pilot’s or copilot’s in- a. Purpose, Radio Set AN/ARC–134(*) wer- strument panel to facilitate tuning b the desired ates in the very high frequency (vhf) range, frequency. Figure 1–2 is a typical block dia- 116.000 through 149.975 MHz, and uses ampli- gram of Radio Set AN/ARC–134(*) installed in tude modulation (am.) to provide receive and an aircraft. Additional equipment (para-10) is transmit voice communications between aircraft, necessary to permit Radio Set AN/ARC-134(*) and between aircraft and fixed or mobile ground to perform its desired function. A vhf antenna radio stations. Radio Set AN/ARC-134 (*) has must be provided on the aircraft to permit re- the design capability to be tuned to any one of ception and transmission. Headset H1O1A/U, 1,360 channels spaced at 25-kHz intervals or equivalent, must be available to provide the throughout its operating frequency range; how- operator monitoring capability for audio signals ever, filters supplied with the AN/ARC–134(*) received by Receiver-Transmitter RT-857/ARC limit channel spacing to 50 kHz and permit the 134. The headset is normally wired through air- AN/ARC-134(*) to be tuned to only 680 selec- craft wiring to Control, Intercommunication Set table channels Alternate filters can be installed C-1611(D)/AIC, or equivalent. External push- which provide a bandpass of 20 kHz for 25- to-talk switching is also wired through aircraft kHz channel spacing, providing the 1,360 chan- wiring to the C–1611D/AIC which is wired to nel tuning capability When used with auxiliary Receiver-Transmitter RT-857/ARC-134. When equipment, Radio Set AN/ARC-134(*) receives the operator presses the push-to-talk switch and and transmits communication signals for an Air speaks into the microphone, the transmit Traffic control Signaling System (ATCSS). function of Receiver-Transmitter RT-857/ARG b. Use. Radio Set AN/ARC-134(*) is normal- 134 is enabled and the desired signal is trans- ly installed in an aircraft and used by crew- mitted. When the push-to-t.alk switch is not members to establish voice communication with pressed, Receiver-Transmitter RT-857/ARC-194 crewmembers of other aircraft and personnel in fixed or mobile ground radio stations, Mounting is in the receive mode. Detected audio signals are MT-3791(*)/ARC-l34 and Receiver-Trans- routed through the C–1611D/AIC to the oper- mitter RT–857/ARC–134 are located in the elec- ator’s headset. Figure 1-2. Typical operational block diagram. 1-2 TM 11-5821-277-20 1-6. Technical Characteristics Sensitivity --------------A maximum signal of 8 microvolts, modulated 30 a. Overall. percent at 1,000 Hz is re- quired to achieve 6-db Power Input .---— ------ +27.5 volts dc, -20 to +10 signal plus noiseto-noise percent, 11 amperes maxi- ratio. mum. Selectivity: Power comsumption: Normal (using sup- ±15 kHz wide minimum at — -------------2.0 amperes plied 50-kHz filters, 6 db down; +31.5 kHz Transmit ------------ 7.5 amperes, carrier only. FSN 5915-989-0898 wide maximum at 60 db 10.5 amperes, carrier with and FSN 5915-731- down. l00-percent modulation 8211, in positions Frequency range ------116.000 through 149-975 FL106 and F1301) MHz.. Sharp (using optional ±6 kHz wide minimum at Number Of channel ---680 channels, as supplied, 2.5-kHz filters Wilcox, 6 db down, ±18 vdc wide spaced 50-kHz apart for puts No. 44266-2 maximum at 60 db down. receive and transmit. Al- and 98179-2, in posi- ternate filters may be in- tions FL106 and stalled for 25-KHz chan- FL301) nel spacing, providing All spurious reponses----- At least 60 db down. 1,360 channels. Audio output impedance: Channeling time -------Less than 4 seconds. Receiver____________500 ohms nominal; accom- Frequency selection---Two out of five (2 X 5) sys- modates output loads from tem. 200 ohms to infinity. Environmental require- ATCSS --------------- 100 ohms. ments: Audio distortion ----------- Less than 7.5 percent at Temperature : normal rated output for Continuous signal modulated 30 per- Operation --- --54°C to +55°C (-65°F cent at 1,000 Hz. to +181° F). Audio response ------------ Less than 6-db total varia- Intermittent tion from 300 to 3,750 Hz. operation --- -54°C to +71°C (-65°F to +160°F). Agc ---------------------- Receiver output will not vary more than 3 db over range (30 minutes of signal input levels from maximum) . 5 to 100,000 microvolts, Power removed ---- -62°C +71°C (-79.6°F and not more tham 6 db over range of signal input to +160°F). levels from 6 to 500,000 Humidity -----95 to 100 percent at 50°C microvolts. Receiver will (112°F) for 48 hours with not overload with 1-volt moisture condenstation on input signal. equipment removed once Squelch threshold ---------3 microvolts or less, inter- each hour. nally adjustable. Altitude ------------ 45,000 feet maximum Vibration: c. Receiver-Transmitter RT-857/ARC-134 Shockmounted ---–-0.30-inch constant excursion (Transmit Function). from 10 to 55 vibrations per second with maximum Output impedance --------- 52 ohms, coaxial. acceleration of 5 g. Con- Power output -------------- 25 watts minimum; 40 stant acceleration of 5 g watts nominal from 55 to 500 vibrations Frequency stability -------- Better than 0.005 percent- per second. Type of emission ---------- Carrier plus modulation. Rigid mount ---------- 0.020-inch constant excursion Type of modulation -------- Amplitude, high level. from 5 to 37 vibrations per second with maximum acc- Modulation system ---------- Internal modulator capable of modulating transmitter coloration of 8 g. Constant 100 per cent with a volt- acceleration of 1.5 g from age of 0.35 volt rms at 37to 500 vibrations per 1,000 Hz applied to 100 second. ohm input circuit. Overall --------- --------6g operating; 15 g impact distortion will not exceed (10-millisecond duration). 10 percent at 100 percent at 100-percent modulat.ion b. Receiver-Transmitter RT-857/ARC-134 (Re- at 1,000 Hz. Audio system ceive Function) . flat within 6 db from 300 Input impedance ---—52 ohms, coaxial. to 3,000 Hz. 1-3 TM 11-5821-277-20 Audio input inpedance: 1-8. Nomencalture and Common Names Microphone . . . . . . . . . . . . . . 100 ohms ATCSS . . . . . . . . . . . . . . . . . . 100 ohms 0 dbm . . . . . . . . . . . . . . . . . . . 500 ohms, center-tapped. Audio input Microphone . . . . . . . . . . . . . . 0.25 volt, 1,000 Hz. ATCSS. . . . . . . . . . . . . . . . . . 1.0 volt, 1,000 hZ. 0 dbm . . . . . . . . . . . . . . . . . . . 1 milliwatts, 1,000 Hz. Sidetone output impedance . . . . 500 ohms nominal; accomo- dates output loads from 200 ohms to infinity. Sidetone output. . . . . . . . . . . . . . 100 milliwatts into external 200- or 500-ohm resistive 1-9. Description of Equipment load for 100-percent modulation. d. Control, Radio Set C-7197/ARC-134. Power requirements. . . . . Frequency rangge and channel spacing Ambient temperature: Continuous operation (30 minutes, maxi- mum). Power removed Humidity fig. 1-1 fig. 1-4 fig 1-3 Altitude Vibration 1-4 Change 2
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