Aviation Electronics Technician 1 - Historic Naval Ships Association

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synchronizer, and a delayed radar trigger is sent backto the radar set after the interrogation trigger isgenerated. The synchronizer develops three basicsignals:. The interrogator trigger which, via thereceiver-transmitter modulating circuit, modulates thetransmission. The interrogation trigger consists ofthree pulses. P1 and P3 are interrogation pulsesspaced either 3, 5, or 8 microseconds apart. In mode1, the spacing is 3 microseconds, mode 2 has a5-microsecond space, and mode 3/A has an8-microsecond space. The ISLS pulse (P2) is always2 microseconds after the P1 pulse.. The gain time control (GTC) trigger, whichinitiates the receiver gate and the GTC circuits in thereceiver-transmitter.. The ISLS control gate, which controlsswitching of the antenna pattern for ISLS purposes.The ISLS control gate, which precedes the P2ISLS pulse by about 0.6 microsecond, is applied tothe switch amplifier. When triggered by theinterrogation trigger, the receiver-transmittergenerates RF pulses at the transmitting frequency of1030 MHz at a nominal peak power level of 2 kW.These pulses are applied to the sum channel of theswitch-amplifier. The difference channel pathbetween the receiver-transmitter and theswitch-amplifier is not used during transmission.When the ISLS control gate is not present at theswitch-amplifier, the RF pulses from the RT sumchannel are passed straight to the antenna via the sumchannel line for radiation out of the sum antennapattern. This pattern is a main lobe with its axis alongthe antenna’s boresight, and small side lobes on eitherside of the boresight. The P1 and P3 interrogationpulses are radiated in the sum pattern.When the ISLS gate arrives at theswitch-amplifier, shortly before the P2 pulse, the sumchannel input at the switch-amplifier is switched tothe difference channel coax to the antenna. Theswitch-amplifier amplifies the P2 ISLS pulse to anominal peak power of 8 kW prior to its being sent tothe antenna. This pulse is transmitted through thedifference antenna pattern, which is two main lobeswith their axes about 20 degrees on either side of theantenna’s boresight, with a minimum signal strengthalong the boresight.The reason for the two radiation patterns is tonarrow the antenna beamwidth effectively inconjunction with the operation of the ISLS circuit atthe transponder. The IFF transponder responds onlyto the P1 and P3 interrogation pukes, which are atleast 9 dB above the P2 pulse. The transponder willnot respond if the P2 pulse level exceeds the P1 level.If an IFF transponder is located more than a smallangle off of the antenna’s boresight, the P2 pulse willbe received at a much higher level than the P1 and P3pulses, and no reply will be generated.MODE 4 TRANSMISSION.— Mode 4 operationis very similar to that of modes 1,2, and 3/A. Themajor difference is that the KIR-1A computergenerates the interrogation trigger, GTC trigger, andthe ISLS control gate instead of the synchronizer.The synchronizer generates a mode 4 pretrigger that issent to the computer. The computer then prepares thechallenge video, which is sent back to thesynchronizer for entry onto the interrogator triggerline to the RT. Mode 4 transmission is the same as inthe other modes as far as the patterns are concerned.Both the sum antenna pattern and the differenceantenna pattern are used.RECEPTION.— During reception, both the sumand difference antenna patterns are open for IFFtransponder reply energy. The purpose of this is toeffectively narrow the reply reception antennabandwidth. This function is called RSLS. The replyRF energy is applied to the receiver-transmitter viathe switch-amplifier’s sum and difference channels.If the energy is above maximum receiver sensitivity,and the sum channel energy is greater than thedifference channel energy by a fixed factor, thereceiver will develop video pulses for decoding.These video pulses are applied to the mode 4decoding circuits within the receiver-transmitter andto modes 1, 2, and 3/A decoding circuits in thesynchronizer. For modes 1, 2, and 3/A, the videopulses are checked for the presence of the standardIFF reply bracket pulses spaced 20.3 microsecondsapart. If these pulses are there, a single video pulse isapplied to the radar set for display. The coded pulsesbetween the brackets are checked against the codeselected at the IFF interrogator control. If the codesmatch, another single display video pulse is applied tothe radar set for display. This second pulse is delayed12 microseconds (or 28 microseconds if thelong-range display is enabled) from the first pulse.When the correct code challenge is used to initiate theinterrogation, the first pulse (bracket decode) is notsent to be displayed.3-22
In mode 4, the reply video pulse is checked by theRT for proper pulse spacing and width. A single replypulse is forwarded to the computer for furtherdecoding. The mode 4 decoded video is applied to thesynchronizer, where two pulses spaced 12 or 28microseconds apart are generated for display by theradar set.PERFORMANCE MONITORING.— The IFFinterrogator set includes performance monitoringcircuits in each of the boxes. When a fault is detected,a signal is sent through the synchronizer to the controlbox. This signal will cause a FAULT light toilluminate instead of the normal CHAL light.When the TEST-CHAL CC switch is set to TEST,the IFF interrogator and the IFF transponder arelinked together. This is done by disabling the normalsuppression, ISLS, and RSLS operations. The triggertiming is also modified to place the zero-range repliesat approximately 4 nautical miles on the radar display.In this configuration, the two sets are checked by eachother for proper performance.REVIEW QUESTIONSQ1. What type of search radar is the APS-115B?Q2. What is the tilt range of the AS-2146/APS-115?Q3.Q4.Q5.Q6.Q7.Q8.Q9.Q10.Q11.Q12.Q13.Q14.Which control switch on the C-7511A/APS-115 is used to select the antenna sectormode?How many functional subsections are in aRT-889/APS-115?What is the scan rate of the AS-2146/APS-115in the long pulse mode of operation?How many operating modes are available onthe 11D13A?What is the minimum range in fire controloperations?In the fire control (automatic search) mode,what name is given to the 1/4-inch scan line?At what closing rate will lock on be lost in thefire control (automatic track) mode?What indication on the scope indicatesbreakaway?What are the five modes used in IFF operations?What antenna(s) is/are used by the IFFtransponder system?The APX-76 interrogator uses what carrierfrequency for transmission?What light illuminates when one of theAPX-76 components fail?3-23
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PASS/FAIL ASSIGNMENT PROCEDURESIf y
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Student CommentsCourse Title:Aviati
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Table 1-1.-Radio-Frequency Spectrum
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Figure 1-3.-LS-602/AI control panel
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Figure 1-4.-Manchester encoding.thr
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they can complete a full cycle. The
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one-shot circuit output is directly
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Figure 1-7.-VHF-AM control box.Figu
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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
Page 73 and 74: transmit a reply when RF interrogat
Page 75 and 76: airspeed-altitude computer. All fra
Page 77: SIF reply code is identical to the
Page 82 and 83: sound wave. The frequency (in hertz
Page 84 and 85: to affect the rate of travel of the
Page 86 and 87: DOPPLER EFFECTWhen there is relativ
Page 88 and 89: Figure 4-7.-Transducer installed on
Page 90 and 91: The Sonar Detecting-Range Set AN/AQ
Page 92 and 93: Figure 4-16.-RO-358/ASQ-13A.mechani
Page 94 and 95: applies 115 volts ac to the transmi
Page 96 and 97: are known as angles of dip (fig. 4-
Page 98 and 99: feet in length and represents the f
Page 100 and 101: compensation is needed for the long
Page 102 and 103: labeled ALT COMP. This switch is us
Page 104 and 105: select which signal goes to which p
Page 106 and 107: the passive directional sonobuoy (f
Page 108 and 109: REVIEW QUESTIONSQ1. How was the wor
Page 110 and 111: TACAN signals. When localizer signa
Page 112 and 113: 1. The HEADING NO-GO indicator illu
Page 114 and 115: Figure 5-7.-New optical sight with
Page 116 and 117: computer’s program determines whi
Page 118 and 119: ias circuit, horizontal and vertica
Page 120 and 121: Figure 5-9.-Symbology—Continued.5
Page 122 and 123: Figure 5-14.-Sparrow mode.Figure 5-
Page 124 and 125: TACTICAL DISPLAY SYSTEM INTERFACEFi
Page 126 and 127: 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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