Aviation Electronics Technician 1 - Historic Naval Ships Association

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Figure 1-7.-VHF-AM control box.Figure 1-6-RT-1397/ARC-197 transceiver.In the P-3C aircraft, this system interfaces with four ofthe intercommunication stations in the transmit/receivefunctions. The pilot, copilot, TACCO, and NAV/COMMstations can transmit and receive over this radio. Theother stations in the aircrafl have receive function only.MAJOR COMPONENTSThere are three components to the AN/ARC-197system. These components are the RT-1397/ARC-197transceiver, the C-11067/ARC-197 VHF-AM controlpanel, and the 949880 VHF antenna.RT-1397/ARC-197 TransceiverThe RT-1397/ARC-197 transceiver (fig. 1-6) is asolid-state unit, consisting of a power supply, frequencysynthesizer, receiver modulator, and transmitter. Thereis one indicator, one push button, one microphone jack,and one headphone jack on the unit. The indicator islabeled TRANSMIT POWER, which illuminates whenoutput power is greater than 10 watts. The push buttonis labeled SQUELCH DISABLE, which will disable thesquelch for low signal levels. The microphone andheadphone jacks are used for maintenance andemergency VHF communication in case of ICS failurein-flight.C-11067/ARC-197 VHF-AM Control BoxThe control box (fig. 1-7) controls the operation ofthe system. There are two dual function knobs and adisplay window on the control panel. The displaywindow shows the selected frequency of the system.The outer ring of the dual function knob on the leftapplies system power and selects the test function. Theinner knob changes the frequency of operation in1-MHz steps over the range of control. The outer ringof the dual function switch on the right is labeled VOL,and it is not used in the P-3 aircraft. Volume is controlledby the ICS system. The inner knob of this control is usedto change the frequency of operation in 25-kHz stepsover the range of control.949880 VHF AntennaThe 949880 antenna is located in the tailcap on topof the vertical stabilizer of the P-3 aircraft. This antennaradiates and receives the VHF radio frequency signals.Signals routed to and from the antenna go through aVHF bandpass filter, which reduces the crosstalkbetween the VHF and UHF systems.VHF FUNCTIONAL DESCRIPTIONThere are two modes of operation with theAN/ARC- 197 radio. These two modes are receive andtransmit.Receive ModeIn the receive mode, the received RF signals fromthe antenna are routed through the filter, and applied tothe receiver circuits in the transceiver. The frequencyselected on the control box is applied to the frequencysynthesizer. The synthesizer uses a single phase-lockedloop to generate RF injection frequencies, in 25-kHzsteps, from 116.000 to 155.975 MHz. The RF injectionfrequencies, along with dc tuning voltages,electronically tune the receiver to the selectedfrequency. The AM detected audio is applied to theaudio amplifier circuit. Squelch circuits disable theoutput amplifier if the required signal-to-noise ratio orcarrier level is not present. The output audio is thenapplied to the ICS interconnection box for distributionto the various stations.1-12
Figure 1-8.-C-11950/ARC-187 control box.Transmit ModeIn the transmit mode, the VHF XMTR control signalfrom any one of the four ICS master control panelsapplies a ground to the transceiver as the VHF keysignal. This VHF key signal provides the push-to-talkcommand to the transceiver to switch it from the receiveto the transmit mode of operation. The synthesizergenerates transmitter drive frequencies from 116.000 to155.975 MHz in 25 kHz steps. Audio from any of thefour ICS master control boxes are applied to themodulator circuit. The modulator circuit provides90-percent amplitude modulation. The compressor andlimiter circuits are included to prevent over-modulation.The transmitter uses five stages of amplifiers to raise theoutput to 20 watts. The RF output is routed to theantenna, through the filter, for radiation. The transceiveralso produces a sidetone output, which is provided to theICS system in the same manner as the receiver audio.UHF COMMUNICATIONSLearning Objective: Recognize componentsand operating principles of the UHF radiosystem.The AN/ARC-187 UHF radio system consists of theUHF-1 radio set, UHF-2 radio set, and the interfacingequipment. The UHF communication system providesamplitude modulation, frequency modulation, andfrequency shift key (FSK) operations. The frequencyrange of this radio system is 225.000 to 399.975 MHz.MAJOR COMPONENTSEach radio set in the system consists of anRT-1571/ARC-187 receiver transmitter, a C-11950(V)3/ARC-187 radio control, an AT-879/ARC antenna, and a740645 antenna switching relay. The UHF-2 radio setalso contains a 974924 antenna select panel. Theantenna and the antenna switching relay will not bediscussed in detail in this manual.RT-1571/ARC-187 Receiver TransmitterThe RT-1571/ARC-187 receiver transmittercontains all the circuitry for the normal operation of theUHF radio set.C-11950/ARC-187 Radio Control BoxThe C-11950/ARC-187 control box (fig. 1-8)provides all the controls for normal operation of theradio set. We will be discussing each of the controls and1-13
Page 7 and 8: PASS/FAIL ASSIGNMENT PROCEDURESIf y
Page 9: Student CommentsCourse Title:Aviati
Page 12 and 13: Table 1-1.-Radio-Frequency Spectrum
Page 14 and 15: Figure 1-3.-LS-602/AI control panel
Page 16 and 17: Figure 1-4.-Manchester encoding.thr
Page 18 and 19: they can complete a full cycle. The
Page 20 and 21: one-shot circuit output is directly
Page 24: indicators in the following text. E
Page 27 and 28: Figure 1-11.-C-9245/ARC-161 control
Page 29 and 30: and the PWR/FILL switch is not in t
Page 31 and 32: panel is in OFF. If the DTS control
Page 33 and 34: the keyboard are sent directly. Rec
Page 35: the signal data converter, where it
Page 38 and 39: Navigation is both an art and a sci
Page 40 and 41: this axis at right angles to it (fi
Page 42 and 43: . Course is the intended horizontal
Page 44 and 45: The standard atmosphere is theoreti
Page 46 and 47: eadings are higher than actual. Thi
Page 48 and 49: The barometric switch in the RAWS a
Page 50 and 51: Major ComponentsThe AN/ARN-84(V) TA
Page 52 and 53: the outputs is used for the automat
Page 54 and 55: DOPPLERIn the following text we wil
Page 57 and 58: CHAPTER 3RADARAs an avionics superv
Page 59 and 60: the antennas will stop at the posit
Page 61 and 62: AS-2146/APS-115 AntennaThe radar an
Page 63 and 64: completes the processing of radar a
Page 65 and 66: In the on-line mode, the sensor sta
Page 67 and 68: Mode SwitchThe mode switch is pract
Page 69 and 70: purpose of the horizon line is to i
Page 71 and 72: Maximum range for tracking is 40,00
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transmit a reply when RF interrogat
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airspeed-altitude computer. All fra
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SIF reply code is identical to the
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In mode 4, the reply video pulse is
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sound wave. The frequency (in hertz
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to affect the rate of travel of the
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DOPPLER EFFECTWhen there is relativ
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Figure 4-7.-Transducer installed on
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The Sonar Detecting-Range Set AN/AQ
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Figure 4-16.-RO-358/ASQ-13A.mechani
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applies 115 volts ac to the transmi
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are known as angles of dip (fig. 4-
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feet in length and represents the f
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compensation is needed for the long
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labeled ALT COMP. This switch is us
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select which signal goes to which p
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the passive directional sonobuoy (f
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REVIEW QUESTIONSQ1. How was the wor
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TACAN signals. When localizer signa
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1. The HEADING NO-GO indicator illu
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Figure 5-7.-New optical sight with
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computer’s program determines whi
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ias circuit, horizontal and vertica
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Figure 5-9.-Symbology—Continued.5
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Figure 5-14.-Sparrow mode.Figure 5-
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TACTICAL DISPLAY SYSTEM INTERFACEFi
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electrical signal, which varies in
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noise-free at that level. The impor
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Like the random interlace, this sys
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The polarity of the signal develope
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The SEC tube has applications in ex
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CHAPTER 6INFRAREDThe term infrared
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Table 6-1.-Characteristics of IR Ra
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potential difference across a PN ju
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system increases, and the reliabili
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used in the Navy, their principles
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signals from the control servomecha
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Figure 6-15.-FLIR positioning/stabi
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Figure 6-17.-Video converter video
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clamping signals from the sync gene
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shared by both azimuth and elevatio
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where they are converted into three
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go to the azimuth/elevation heat si
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TARGET TRACKING SIGHT CONTROLAs men
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control is injected in this module.
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CHAPTER 7WEAPONS SYSTEMSAs a result
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Figure 7-5.-Master light control pa
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Rocket firing systemWalleye systemA
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The wing-form display is displayed
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Figure 7-15.-Emergency jettison con
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The A/A weapon select switch select
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Part of the system consists of unpr
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Figure 7-22.-SH-3 (series) search a
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ottle and the ECU are mounted on to
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Figure 7-25.-Pylon/rack assembly.ci
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REVIEW QUESTIONSQ1. True or False.
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COMPUTER APPLICATIONSTYPES OF COMPU
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the most important. This data manip
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and other data that are to be used
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to represent the same data that was
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compatibility permits the computer
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most cases, the processing speed fa
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4. Stores the results of manipulati
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An overall check of a computer can
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CHAPTER 9AUTOMATIC CARRIER LANDING
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stabilized deck-coordinated system
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Figure 9-3.-Mode I landing sequence
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Figure 9-5.-Lateral automatic wave-
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Precipitation StaticPrecipitation s
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l Sliding-contact interference. Thi
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the signal applied to it. These spu
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the following methods: short circui
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Figure 10-4.-Internal construction
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Figure 10-9.-Methods for using RC f
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Band-Rejection FiltersA band-reject
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Causes of Static ElectricityGenerat
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composed of carbon particles, impre
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APPENDIX 1REFERENCES USED TODEVELOP
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Chapter 7Airborne Weapons/Stores Lo
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CHAPTER 3A1.A2.A3.A4.A5.A6.A7.A8.A9
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A7. Linking two or more computers t
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FORMULASAIII-2
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AIII-4
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Comparison of Units in Electric and
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Antisubmarine warfare weapons syste
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Electrostatic discharge, 10-15compo
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Heads-up display (HUD), 5-5air-to-a
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NNavigation basics, 2-1airborne nav
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Teletype system, 1-22block diagram,
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Assignment QuestionsInformation: Th
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1-11. What will the Sillumination o
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1-35.1-36.1-37.1-38.UHF-1 does NOT
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1-59. What arethat thetactical1. Fr
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ASSIGNMENT 2Textbook Assignment:
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IN ANSWERING QUESTIONS 2-22 THROUGH
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2-43. What method does the AN/APN-1
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2-64. What distance is the maximum
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3-12.3-13.The antenna position prog
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3-32. The 128 nautical mile range i
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IN ANSWERING QUESTION 3-53,FIGURE 3
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3-74. What is the nominal peak powe
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4-12. Sonar transmission losses can
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4-31.4-32.4-33.When positive gradie
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4-52. The function of the dual curs
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4-71. The angle between a magnetic
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IN ANSWERING QUESTIONS 5-9 THROUGH
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5-29. What component contains theop
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5-51. What type of RF output signal
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6-20. On the HSI, when a tactical m
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6-42. What control(s) the symbolbri
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6-65. Which, if any, of the followi
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7-11. If the temperature of a black
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7-34.A scan mirror is indexed three
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7-56. What is the primary differenc
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8-21. With the landing gear handle
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8-42. With the F/A-18 AIM-9 Sidewin
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8-66. The jettison of wing stores I
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9-13. What method is used to change
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9-36. In magnetic core memories, a
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9-57. What typeaccess toof instruct
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10-12. To maintain the angle-of-att
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10-35. A receiver tuned to 2.4 kHze
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10-55. When rubbed against any of t
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Aviation Electronics Technician 1 - Historic Naval Ships Association

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