_<\/strong>? Decrease
Which frequency has least amount of problems? Optimum Working Frequency (owf)
What is the purpose of Amplitude modulation? Transmit over longer distances
What is main purpose of AM receiver? Pickup electromagnetic waves\/restore original low frequency intelligence (RECEIVE RADIO WAVES)
What 4 things do AM receivers perform? Reception, selection, detection, reproduction
What are 4 parts of AM receiver block diagram? Tuner, IF amp, detector, AF amp
What is purpose of tuner? Converts received RF into IF (intermediate frequency)
What is the purpose of IF amp? Amplify IF from tuner
What is purpose of detector? Recover original audio from IF signal
What is purpose of AF amp? increases detected audio enough to drive speaker
What is LO? IF + RF (set 455kHz above received signal)
What 3 circuits are in tuner? RF amp, mixer, local oscillator
What is IF? 455kHz (LO – RF)
What 4 things does mixer produce? RF, LO, Sum (RF+LO), IF (LO-RF)
What circuits make up detector? Rectfier, RC circuit
What does rectifier circuit do? Eliminates pos or neg audio signal from carrier
What does RC circuit do? Removes carrier from low freq audio
What circuits make up AF amp? pre-amp, driver, PUSH-PULL amp
Which part of AM receiver provides AVC? Detector
All stages of IF amp are tuned to what? 455kHz (IF)
What is the purpose of AVC? Keeps volume constant
What is purpose of T6 in push-pull amp (AF amp)? Provides push-pull amp with two signals 180 degrees out of phase
What frequency is C1A tuned to? RF
What signal is C1B tuned to? LO (LF+RF)
What frequency is T2 tuned to (Tuner)? LO
What frequency is T3 tuned to (tuner)? IF
What 3 functions do Q1 perform? Amp, mixer, oscillator
What type of signal is AVC? Negative signal
What is purpose of T7? (AF amp) Speaker driver<\/p>\n","protected":false},"excerpt":{"rendered":"ATT Test 7 (Latest 2024\/ 2025 Update) Questions and Verified Answers| 100% Correct| Grade A ATT Test 7 (Latest 2024\/ 2025 Update)Questions and Verified Answers| 100%Correct| Grade AQ: Which type of multivibe circuit is free running?Answer:AstableQ: What components are in feedback circuit (Astable)?Answer:Two capacitorsQ: What components are in feedback circuit (monostable)?Answer:One capacitors and one resistorQ: […]<\/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-131723","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/131723","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=131723"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/131723\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=131723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=131723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=131723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}