_ phase Changing A stationary objects phase is always the Same
What type of radar transmits a constant flow of EM energy NOT REFERENCED TO TIME? Continuous wave
Which radar uses multiple antennas to transmit and receive RF energy? Continuous wave
CW radars cannot determine but are used to determine ? Range, an objects velocity
Which system is similar to continuous wave radar? Frequency modulation
How do frequency modulation systems work? Compare frequency of received signal to a fixed reference signal
What can frequency modulation systems provide that CW can’t? Range and bearing info
What type of radar provides a way to measure round-trip transmit time of transmitted signal by constantly changing frequency to provide range? Frequency modulated CW (FM-CW)
What type of radar provide range and bearing info to surface contacts, coastal nav points, and slow low-flying aircraft? Surface search radar
What type of air search radar does the FAA use for commercial air traffic control? Long and short range air search radar
What does the military use air search radar for? Air traffic control and airborne target detection
What type of radar is used to land aircraft during periods of low visibility? Specialized 3D radar called precision approach radar (PAR)
What type of radars locate targets and direct weapon systems to targets? Tracking radar
What do tracking radars provide? Range, bearing, and elevation data of one or more targets (very accurate)
What antenna is used primarily for weapons control purposes? Parabolic
What antenna produces a beam that is WIDE in the vertical plane and NARROW in the horizontal plane? Orange-peel parabolic
What antenna is used for by some 3D radars and ground control precision approach radars? cylindrical parabolic
What antenna is used by low frequency 2D air search radar? Broadside array
What kind of information can mechanical scans gather? Range, azimuth, and altitude
What do electronic scans do? Move beam up and down antenna to find elevation (altitude) information
What information is only found by specialized 3D radar antennas? Altitude
What do transmission lines do? Provide physical medium to guide output energy from transmitter to antenna, antenna to receiver, and between various components
What develops the characteristic impedance of the transmission line cable? Combination of the resistance, capacitance, and inductance of the cable
What needs to happen to transfer the maximum amount of energy from the source to the load? Impedance must be matched or equal between input and output
What is the result of mismatched impedance? Damaging standing waves reflected back toward the source, causes loss of power
What is skin effect? High frequency current that has a tendency to flow to the outside of the conductor
What is induction loss? When mag field expands and contracts inducing voltage and current into conducting material near the transmission lines
What is radiation loss? Loss to the atmosphere and not to a nearby object
What type of loss is normally in the form of heat dissipation? Dielectric loss
How is dielectric loss held to a minimum? High resistance dielectric (insulation)
What type of wire has a solid center conductor and a braided outer conductor separated by a dielectric material? Coaxial cable
What type of transmission line has very little radiation loss? Coaxial cable
What cable is used mainly for TV reception and transmission of low power frequencies up to 200MHz? Twin Lead line
What transmission line is the simplest and least expensive and used for low volts\/low frequency? Twisted pair
What is a waveguide? A system of material boundaries capable of guiding electromagnetic energy
What are 3 types of waveguides? Elliptical, rectangular, circular
What is the most effective medium to transfer microwave RF energy from one point to another? Waveguides
The power handling capabilities of transmission lines are directly related to what Distance between conductors
A waveguide with the same dimensions as a coaxial cable can handle how much more power? More than twice the power
For proper operation of a waveguide its width must be approximately Half a wavelength
What determines the range of operating frequencies of a waveguide? “The width (“”A”” dimension)”
What 3 things cause standing waves? Impedance mismatches, obstructions, and misaligned sections
A ratio of indicates no standing wave 1
What is the iris? Metal diaphragm located in waveguide, contains opening called window or aperture (used to provide impedance matching)
What is the bending, twisting, joining, and installation of waveguides called? Waveguide plumbing
What are two classifications of transmitting antennas? Hertz and Marconi
What is a measure of the antennas ability to focus energy in one or more specific directions? Directivity
What type of antenna has low directivity? Omnidirectional
What is the ability of an antenna to act as a transmitting or receiving antenna? Reciprocity
The direction of polarization is the direction of The electric vector
Radar and microwave antennas are usually Directional
What are two characteristics of directional antennas? Directivity and power gain
What antenna is used most often for microwaves? Feed horn
What antenna is used for height finding and where a highly directive pattern in vertical and broader pattern in horizontal is needed? Orange-peel
What antenna is used to find objects bearing because of a narrow horizontal beam? Truncated parabola
What are three branches of electronic warfare? electronic support measures, electronic counter measures, and electronic counter counter measures
Which part of electronic warfare search RF spectrum for emissions and analyze results to exploit weapons or sensors involved? Electronic support measures
What is the ability of an RF spectrum system to reject unwanted radiations and minimize its own transmissions from causing interferance? Electromagnetic compatibility (allows radars to operate at optimum performance level
What is referred to as active ECM? Jamming
What is a form of passive ECM? Chaff (creates clutter or false targets)
What are two categories of electronic counter-countermeasures? Denial and deception (active and passive)
What type of devices are used to produce signals designed to prevent detection and tracking of targets? Active denial ECM
What are 5 types of active denial ECM? CW jamming, spot noise, sweep jamming, sidelobe repeater, barrage noise
What is generation of RF noise in particular band or frequency channel to change signal to noise ratio of radar receiver Spot Noise
What type of ECM is uses non-electronic devices to prevent detection and tracking? Passive denial
What are three types of passive denial ECM? Chaff, reduced radar cross section (RCS), and radar absorbing materials (RAM)
What type of ECM uses electronic devices to produce false echo signals to deceive and confuse a radar receiver? Active deception
What are 3 types of active deception ECM? Repeaters, range gate stealers, and velocity gate stealers
What type of ECM uses non-electronic devices to produce false target returns and confuse radar processor or operators ability to distinguish targets? Passive deception
What are two types of passive deception ECM? Forward dispensed chaff and decoys
What is one of the best ECCM devices? Highly trained operator
The largest group of ECCM features is contained in the Radar receiver\/signal processor
Dry air pressure used in high power waveguides is PSI and is __<\/em><\/strong> PSI in low power waveguides 25-35, 1-8
What are three types of dehydrators? Refrigerant, desiccant, and combination
What is the ideal dew point in equipment waveguides? Below -40F
What are two types of LEDs used for fiber optics? Heterojunction and homojunction
What does LASER stand for? light amplification by stimulated emission of radiation
What is responsivity? Compares change in the detectors current with the change in incident light power
What determines detectors optimum wavelengths? Composition<\/p>\n\n\n\n<\/h1><\/p>\n","protected":false},"excerpt":{"rendered":"
ATT Test 12 (Latest 2024\/ 2025 Update) Questions and Verified Answers| 100% Correct| Grade ATT Test 12 (Latest 2024\/ 2025 Update)Questions and Verified Answers| 100%Correct| Grade AQ: What part of a radar system controls all radar system timing signals that ensure synchronousoperation and are related to PRF?Answer:Synchronizer (timer)Q: What part of radar system contains a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-131713","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/131713","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=131713"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/131713\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=131713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=131713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=131713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}