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FREQUENCY MODULATION - PART I - BASIC PRINCIPLES
 
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FREQUENCY MODULATION - PART I - BASIC PRINCIPLES - Department of Defense 1964 - PIN 28398 - FUNDAMENTALS OF AM AND FM RADIO COMMUNICATION, HOW FM ELIMINATES PROBLEM OF ELECTRICAL INTERFERENCE, FUNCTIONING OF FM RADIO EXAMINED IN DETAIL.
Views: 201120 PublicResourceOrg
AM and FM Radio As Fast As Possible
 
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AM & FM radio have been around since way before the digital age. How can radios decode AM & FM signals only using analog technology? Freshbooks message: Head over to http://freshbooks.com/techquickie and don’t forget to enter Tech Quickie in the “How Did You Hear About Us” section when signing up for your free trial. Follow: http://twitter.com/linustech Join the community: http://linustechtips.com
Views: 449452 Techquickie
Fundamentals of RF and Wireless Communications
 
38:45
Learn about the basic principles of radio frequency (RF) and wireless communications including the basic functions, common specifications, and key parameters involved in defining and evaluating RF communications systems.
Views: 3084 Maxim Integrated
Radio Electronics  Frequency Modulation Basic Principles pt2 2 (1964) US Army Training Film
 
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Radio Electronics Frequency Modulation Basic Principles. https://en.wikipedia.org/wiki/Frequency_modulation Passband modulation Analog modulation AM FM PM QAM SM SSB Digital modulation ASK APSK CPM FSK MFSK MSK OOK PPM PSK QAM SC-FDE TCM WDM Hierarchical modulation QAM WDM Spread spectrum CSS DSSS FHSS THSS See also Capacity-approaching codes Demodulation Line coding Modem AnM PoM PAM PCM PWM ΔΣM OFDM FDM Multiplexing vte Animation of audio, AM and FM signals A signal may be carried by an AM or FM radio wave. FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has both AM and FM receivers. With a million-volt arc as a source of interference behind it, the AM receiver produced only a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter W2XMN in New Jersey. In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. In analog frequency modulation, such as FM radio broadcasting of an audio signal representing voice or music, the instantaneous frequency deviation, the difference between the frequency of the carrier and its center frequency, is proportional to the modulating signal. Digital data can be encoded and transmitted via FM by shifting the carrier's frequency among a predefined set of frequencies representing digits – for example one frequency can represent a binary 1 and a second can represent binary 0. This modulation technique is known as frequency-shift keying (FSK). FSK is widely used in modems and fax modems, and can also be used to send Morse code.[1] Radioteletype also uses FSK.[2] Frequency modulation is widely used for FM radio broadcasting. It is also used in telemetry, radar, seismic prospecting, and monitoring newborns for seizures via EEG,[3] two-way radio systems, music synthesis, magnetic tape-recording systems and some video-transmission systems. In radio transmission, an advantage of frequency modulation is that it has a larger signal-to-noise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation (AM) signal. For this reason, most music is broadcast over FM radio. Frequency modulation and phase modulation are the two complementary principal methods of angle modulation; phase modulation is often used as an intermediate step to achieve frequency modulation. These methods contrast with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency and phase remain constant.
Views: 31 Old Movies Reborn
Radio Electronics: Frequency Modulation Basic Principles Part 1 of 2 (1964) US Army Training Film
 
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FUNDAMENTALS OF AM AND FM RADIO COMMUNICATION, HOW FM ELIMINATES PROBLEM OF ELECTRICAL INTERFERENCE, FUNCTIONING OF FM RADIO EXAMINED IN DETAIL. US Army Training Film TF11-3482 https://en.wikipedia.org/wiki/Frequency_modulation In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. In analog applications, the difference between the instantaneous and the base frequency of the carrier is directly proportional to the instantaneous value of the input-signal amplitude. Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying. FSK (digital FM) is widely used in data and fax modems. Morse code transmission has been sent this way, and FASK was used in early telephone-line modems. Radioteletype also uses FSK. FM modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems. In radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling naturally-occurring noise. Radio Edwin Howard Armstrong (1890--1954) was an American electrical engineer who invented wideband frequency modulation (FM) radio. He patented the regenerative circuit in 1914, the superheterodyne receiver in 1918 and the super-regenerative circuit in 1922. Armstrong presented his paper, "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation", (which first described FM radio) before the New York section of the Institute of Radio Engineers on November 6, 1935. The paper was published in 1936. As the name implies, wideband FM (WFM) requires a wider signal bandwidth than amplitude modulation by an equivalent modulating signal; this also makes the signal more robust against noise and interference. Frequency modulation is also more robust against signal-amplitude-fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission, hence the term "FM radio" (although for many years the BBC called it "VHF radio" because commercial FM broadcasting uses part of the VHF band—the FM broadcast band). FM receivers employ a special detector for FM signals and exhibit a phenomenon known as the capture effect, in which the tuner "captures" the stronger of two stations on the same frequency while rejecting the other (compare this with a similar situation on an AM receiver, where both stations can be heard simultaneously). However, frequency drift or a lack of selectivity may cause one station to be overtaken by another on an adjacent channel. Frequency drift was a problem in early (or inexpensive) receivers; inadequate selectivity may affect any tuner. An FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes. A high-efficiency radio-frequency switching amplifier can be used to transmit FM signals (and other constant-amplitude signals). For a given signal strength (measured at the receiver antenna), switching amplifiers use less battery power and typically cost less than a linear amplifier. This gives FM another advantage over other modulation methods requiring linear amplifiers, such as AM and QAM. FM is commonly used at VHF radio frequencies for high-fidelity broadcasts of music and speech. Normal (analog) TV sound is also broadcast using FM. Narrowband FM is used for voice communications in commercial and amateur radio settings. In broadcast services, where audio fidelity is important, wideband FM is generally used..
Views: 44 Old Movies Reborn
How Oscillator Works ? The Working Principle of the Oscillator Explained
 
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In this video, the working principle of the Electronic Oscillator has been explained. By watching this video, you will learn the following topics: 0:42 What is Oscillator 1:04 How OScillator Works? 4:03 Barkhausen Criteria for Oscillations and mathematical derivation 8:12 Different Types of Oscillators What is Oscillator: The Oscillator is an electronic circuit, which accepts the DC voltage and generates the periodic time varying waveform of the desired frequency. How Oscillator Works: The Oscillator is an amplifier with positive feedback. When the Oscillator is turned ON, then the thermal noise is amplified by the amplifier of the oscillator. The feedback circuit in the oscillator is the frequency selective circuit. It amplifies only one particular frequency from all other frequencies. And over the period of time, the one frequency will get build up and gives the periodic oscillations at the output. Barkhausen Criteria: For sustained Oscillation, 1) the magnitude of the loop gain AB should be equal to 1 (AB =1) 2) Phase Shift introduced by the amplifier and the feedback circuit should be zero. Types of OScillator: Depending on the type of feedback circuit the oscillators can be broadly classified as 1) RC OScillator 2) LC OScillator 3) Crystal OScillator Depending on the arrangement of these R, L, C components, it can be further classified. (Colpitts Oscillator, Hartley Oscillator etc.) Depending on the type of output, the oscillators can be classified as 1) Harmonic Oscillators (Gives Sinusoidal Output) 2) Relaxation OScillators (Gives Non-Sinusoidal Output, Like square wave and Triangular Wave) This video will be helpful to all the students of science and engineering in understanding the working principle of the oscillator. #Oscillator #HowOscillatorWorks Follow me on YouTube: https://www.youtube.com/allaboutelectronics Follow me on Facebook: https://www.facebook.com/ALLABOUTELECRONICS/ Follow me on Instagram: https://www.instagram.com/all_about.electronics/ Music Credit: http://www.bensound.com/
Views: 86211 ALL ABOUT ELECTRONICS
ATPL Training / Airframes & Systems #4 Hydraulics - Basic Principles of Hydromechanics
 
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Airline Transport Pilot Licence Training (CBT) Videos Next Lesson: #5 Hydraulics - Fluids, Pipelines and Seals Support the Channel and Subscribe!!
Basic Principles of Frequency Modulation (1944)
 
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Many great chalk talks, diagrams, animation showing technical aspects of radio transmission We digitized and uploaded this film on behalf of the Prelinger Archive. Email us at [email protected] if you have questions about the footage and are interested in using it in your project.
Views: 138 A/V Geeks
Altimetry basic principles
 
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Views: 124321 mitrowsky
How a Crystal Radio Works
 
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Full details of how a crystal radio works, right down to the electron level. We start with a demonstration of all the parts in action, showing how the radio waves interact with the antenna and antenna coil to produce a fluctuating magnetic field, which induces electron flow in the tuning coil, which works with the tuning capacitor, which is followed by the diode and crystal earpiece. We talk about why a leaky germanium diode is needed with this particular circuit or how a bypass resistor can be used instead. That's followed by how the tuning is done using a tuning coil in parallel with a tuning capacitor, which together are tuned to a resonant frequency the same as the radio frequency by adjusting the coil's inductance and the capacitor's capacitance. Then we show how a radio wave is formed from a microphone's audio wave using amplitude modulation (AM). This then shows how the diode is necessary for converting the radio wave back to an audio wave for use by the earpiece or speaker. Next we discuss selectivity versus sensitivity and why a separate antenna coil is used. An finally we show a few other crystal radio circuits. Thanks to the following for reviewing development versions of this video: Slovenija12345 of http://www.youtube.com/user/Slovenija12345 and Charles Wenzel of http://www.techlib.com/electronics/crystal.html See also... How to Make/Build a Crystal Radio video, the radio explained in this video: http://youtu.be/VqdcU9ULAlA Crystal Radio Troubleshooting and Tips video: http://youtu.be/HZZmKZJrIW0 How to Make an Amplifier for a Crystal Radio Earpiece video: http://youtu.be/cQ-LxMDrD_o Make a Crystal Radio Coil with Taps video: http://youtu.be/Gi9EmhrcfIg There's also a crystal radio page on my website: http://rimstar.org/equip/crystal_radios.htm 3D modelling and 3D animation done using Blender 2.63. To follow me on Twitter: https://twitter.com/#!/RimStarz http://rimstar.org
Views: 460098 RimstarOrg
How AM and FM Works
 
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Highly edited version of US Army training video (TF11-3482 - Frequency Modulation Part I: Basic Principles, 1964) on the basics of FM transmission. This also shows how AM works. For educational purposes for my students.
Views: 266715 Dana Lee
Radio Electronics: Frequency Modulation Basic Principles pt2-2 1964 US Army Training Film
 
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NEW VERSION in one piece instead of multiple parts, and with improved video & sound: more at . NEW VERSION in one piece instead of multiple parts, and with improved video & sound: more at . more at FREQUENCY MODULATION - PART I - BASIC PRINCIPLES: FUNDAMENTALS OF AM AND FM RADIO . more at NEW VERSION in 1 piece instead of parts: Excellent Army training film in .
Views: 51 nureho lemara
Basic Antenna Fundamentals
 
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Basic Antenna Fundamentals Antennas are a very important component of communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, into an electromagnetic wave in free space. Antennas demonstrate a property known as reciprocity, which means that an antenna will maintain the same characteristics regardless if it is transmitting or receiving. Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. An antenna must be tuned to the same frequency band of the radio system to which it is connected, otherwise the reception and the transmission will be impaired. When a signal is fed into an antenna, the antenna will emit radiation distributed in space in a certain way. A graphical representation of the relative distribution of the radiated power in space is called a radiation pattern.
Views: 64791 Dan Vanevenhoven
Frequency Modulation: Basic Principles (1964)
 
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Educational video produced by the US Department of Defense from 1964. The video illustrates the basics of AM and FM radio and includes an overview of frequency modulation and interference.
Views: 482 All Classic Video
Basic VHF and UHF Fundamentals
 
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Basic VHF and UHF Fundamentals Antennas are a very important component of communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, into an electromagnetic wave in free space. Antennas demonstrate a property known as reciprocity, which means that an antenna will maintain the same characteristics regardless if it is transmitting or receiving. Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. An antenna must be tuned to the same frequency band of the radio system to which it is connected, otherwise the reception and the transmission will be impaired. When a signal is fed into an antenna, the antenna will emit radiation distributed in space in a certain way. A graphical representation of the relative distribution of the radiated power in space is called a radiation pattern.
Views: 194556 Dan Vanevenhoven
FREQUENCY MODULATION PART BASIC PRINCIPLES
 
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This is one of the best tutorials on FM and AM
Views: 1128 tvecourse
Frequency Modulation: Basic Principles (1964)
 
28:37
Educational video produced by the US Department of Defense from 1964. The video illustrates the basics of AM and FM radio and includes an overview of frequency modulation and interference.
FM Radio Electronics: Frequency Modulation: Basic Principles (1964) US Army Training Film
 
25:37
"FREQUENCY MODULATION - PART I - BASIC PRINCIPLES: FUNDAMENTALS OF AM AND FM RADIO COMMUNICATION, HOW FM ELIMINATES PROBLEM OF ELECTRICAL INTERFERENCE, FUNCTIONING OF FM RADIO EXAMINED IN DETAIL." US Army Training Film TF11-3482 https://en.wikipedia.org/wiki/Frequency_modulation In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. In analog applications, the difference between the instantaneous and the base frequency of the carrier is directly proportional to the instantaneous value of the input-signal amplitude. Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying. FSK (digital FM) is widely used in data and fax modems. Morse code transmission has been sent this way, and FASK was used in early telephone-line modems. Radioteletype also uses FSK. FM modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems. In radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling naturally-occurring noise. Radio Edwin Howard Armstrong (1890--1954) was an American electrical engineer who invented wideband frequency modulation (FM) radio. He patented the regenerative circuit in 1914, the superheterodyne receiver in 1918 and the super-regenerative circuit in 1922. Armstrong presented his paper, "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation", (which first described FM radio) before the New York section of the Institute of Radio Engineers on November 6, 1935. The paper was published in 1936. As the name implies, wideband FM (WFM) requires a wider signal bandwidth than amplitude modulation by an equivalent modulating signal; this also makes the signal more robust against noise and interference. Frequency modulation is also more robust against signal-amplitude-fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission, hence the term "FM radio" (although for many years the BBC called it "VHF radio" because commercial FM broadcasting uses part of the VHF band—the FM broadcast band). FM receivers employ a special detector for FM signals and exhibit a phenomenon known as the capture effect, in which the tuner "captures" the stronger of two stations on the same frequency while rejecting the other (compare this with a similar situation on an AM receiver, where both stations can be heard simultaneously)... An FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes. A high-efficiency radio-frequency switching amplifier can be used to transmit FM signals (and other constant-amplitude signals)... Normal (analog) TV sound is also broadcast using FM...
Views: 39 Old Movies Reborn
FREQUENCY MODULATION - PART I - BASIC PRINCIPLES
 
28:37
This movie is part of public domain. Info: Department of DefensePIN 28398FREQUENCY MODULATION - PART I - BASIC PRINCIPLESFUNDAMENTALS OF AM AND FM RADIO COMMUNICATION, HOW FM ELIMINATES PROBLEM OF ELECTRICAL INTERFERENCE, FUNCTIONING OF FM RADIO EXAMINED IN DETAIL. Downloaded from https://archive.org
Views: 1 Public Domain
ATPL Training / DC Electrics #02 Basic Principles - Units of Electricity
 
17:22
Airline Transport Pilot Licence Training (CBT) - Direct Current (AC) Next Lesson: #03 Basic Principles - Complex DC Circuits Support the Channel and Subscribe!!
Wireless Mics Part 2 - Basic Radio Principles
 
06:20
Join us in part 2 as we talk about Basic Radio Principles and discover how this relates to wireless radio systems. if you missed part 1 you can check it out here on my channel or please visit us a www.audioworkshop.co.nz
Views: 35 Matt Chapman
Basic Radio Interferometry I
 
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An overview of the basic principles behind using two radio antennas to localize signals coming from the sky. Presentation by Karol Sanchez.
Views: 17474 Aaron Parsons
Basic Principles of Frequency Modulation Part 1 of 2 (1944) US Army Training Film; Kent Smith
 
15:01
Excellent Army training film in which actor Kent Smith (Cat People...) explains the fundamentals of FM radio. US Army Training Film TF11-2069 https://en.wikipedia.org/wiki/Frequency_modulation In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. In analog applications, the difference between the instantaneous and the base frequency of the carrier is directly proportional to the instantaneous value of the input-signal amplitude. Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying. FSK (digital FM) is widely used in data and fax modems. Morse code transmission has been sent this way, and FASK was used in early telephone-line modems. Radioteletype also uses FSK. FM modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems. In radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling naturally-occurring noise. Radio Edwin Howard Armstrong (1890--1954) was an American electrical engineer who invented wideband frequency modulation (FM) radio. He patented the regenerative circuit in 1914, the superheterodyne receiver in 1918 and the super-regenerative circuit in 1922. Armstrong presented his paper, "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation", (which first described FM radio) before the New York section of the Institute of Radio Engineers on November 6, 1935. The paper was published in 1936. As the name implies, wideband FM (WFM) requires a wider signal bandwidth than amplitude modulation by an equivalent modulating signal; this also makes the signal more robust against noise and interference. Frequency modulation is also more robust against signal-amplitude-fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission, hence the term "FM radio" (although for many years the BBC called it "VHF radio" because commercial FM broadcasting uses part of the VHF band—the FM broadcast band). FM receivers employ a special detector for FM signals and exhibit a phenomenon known as the capture effect, in which the tuner "captures" the stronger of two stations on the same frequency while rejecting the other (compare this with a similar situation on an AM receiver, where both stations can be heard simultaneously)... An FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes. A high-efficiency radio-frequency switching amplifier can be used to transmit FM signals (and other constant-amplitude signals)... Normal (analog) TV sound is also broadcast using FM... http://en.wikipedia.org/wiki/Kent_Smith Kent Smith (March 19, 1907 -- April 23, 1985) was an American actor who had a lengthy career in film, theater, and television... His biggest successes occurred during the 1940s in films such as Cat People (1942), Hitler's Children (1943), This Land Is Mine (1943), Three Russian Girls (1943), Youth Runs Wild (1944), The Curse of the Cat People (1944), The Spiral Staircase (1946), Nora Prentiss (1947), Magic Town (1947), The Fountainhead (1949), My Foolish Heart (1949), and The Damned Don't Cry! (1950). He continued acting in supporting roles from the 1950s in films such as A Distant Trumpet and made his final film appearance in Billy Jack Goes to Washington (1977)...
Views: 96 Old Movies Reborn
Output Transformers: A Discussion of Basic Principles
 
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In this video I attempt the unenviable task of trying to explain the design and function of one the most significant, yet misunderstood, components in tube amplifiers: the Output Transformer. Topics include: Purpose of the OPT, Winding Ratios, Demonstration of a Method to Measure the Winding Ratio, Consequences of Using Incorrect-Impedance Speakers, Impedance vs Resistance, Impedance Reflection, and how to select the proper OPT for your amp. Be warned: some math is inevitable, but I try to provide sufficient explanation to (hopefully) make it all palatable. Think of this as a video buffet.....consume it all, or simply pick and choose that which appeals to you :) If you enjoy videos featuring classic vintage amps, jukeboxes, homemade electromechanical devices, and clear, basic technical presentations, then please subscribe to my channel. You will gain immediate access to over 85 videos, and (if you activate the service) you will be notified each time a new video is posted. Thanks for watching !!!
Views: 141113 Uncle Doug
How Radio Waves Are Produced
 
04:58
UNLOCKING THE MYSTERIES BEHIND RADIO WAVES. Electric current creates magnetic field, oscillating electric current creates oscillating magnetic field and not "electromagnetic wave" as current belief. Electron has a standing- electric field and magnetic field at right angle (watch video structure of electron). The flow of electrons in a conductor is essentially caused by the attraction between the electric fields of mobile electrons and "fixed" positive charges in the conductor. Oscillation of electrons in a conductor is caused by the alternation of electric polarity in the conductor. Because of electric field and magnetic field of an electron is at right angle, when oscillates the electric field of the electron will be parallel to the oscillation and magnetic field will be perpendicular to the oscillation.This oscillation of the electron creates transverse wave on its magnetic line and the oscillating magnetic line is radiated to space. http://www.amazon.com/author/atom http://www.facebook.com/novaphysica https://www.youtube.com/user/atommodel
Views: 776055 AtomModel
FREQUENCY MODULATION PART I BASIC PRINCIPLES - The Best Documentary Ever
 
32:20
FREQUENCY MODULATION - PART I - BASIC PRINCIPLES - Department of Defense 1964 - PIN 28398 - FUNDAMENTALS OF AM AND FM RADIO . more at Excellent Army training film in which actor Kent Smith (Cat People.) explains the fundamentals of FM radio. Reupload of a . more at NEW VERSION in 1 piece instead of parts: Excellent Army training film in . more at FREQUENCY MODULATION - PART I - BASIC PRINCIPLES: FUNDAMENTALS OF AM AND FM RADIO .
Views: 19 Kamron Hyatt
Basic Principles of Hygiene | Dr Asif Tauseef | Radio News Network
 
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Dr. Asif Tauseef, Consultant Family Medicine is telling some basic principles of Hygiene. Produced by: Radio News Network Interview by: Fatima Azhar Cameraman & Editor: Shamshad Afridi
Views: 60 Radio News Network
Amplitude Modulation tutorial and AM radio transmitter circuit
 
07:43
This video covers the history of the discovery of radio waves, to the creation of simple oscillator based radio transmitters. Then I explain what modulation and amplitude modulation are, and show you how to build a low powered AM radio transmitter. My webpage: http://www.afrotechmods.com Original design by Stefan0719: http://www.youtube.com/watch?v=f42W9jNHMZ0 Kickass music by imeddy: http://www.youtube.com/watch?v=MzptQ4ZuTTI
Views: 371507 Afrotechmods
Basic Principles of Frequency Modulation (1944) US Army Training Film; Kent Smith
 
29:51
Excellent Army training film in which actor Kent Smith (Cat People...) explains the fundamentals of FM radio. US Army Training Film TF11-2069 https://en.wikipedia.org/wiki/Frequency_modulation In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. In analog applications, the difference between the instantaneous and the base frequency of the carrier is directly proportional to the instantaneous value of the input-signal amplitude. Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying. FSK (digital FM) is widely used in data and fax modems. Morse code transmission has been sent this way, and FASK was used in early telephone-line modems. Radioteletype also uses FSK. FM modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems. In radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling naturally-occurring noise. Radio Edwin Howard Armstrong (1890--1954) was an American electrical engineer who invented wideband frequency modulation (FM) radio. He patented the regenerative circuit in 1914, the superheterodyne receiver in 1918 and the super-regenerative circuit in 1922. Armstrong presented his paper, "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation", (which first described FM radio) before the New York section of the Institute of Radio Engineers on November 6, 1935. The paper was published in 1936. As the name implies, wideband FM (WFM) requires a wider signal bandwidth than amplitude modulation by an equivalent modulating signal; this also makes the signal more robust against noise and interference. Frequency modulation is also more robust against signal-amplitude-fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission, hence the term "FM radio" (although for many years the BBC called it "VHF radio" because commercial FM broadcasting uses part of the VHF band—the FM broadcast band). FM receivers employ a special detector for FM signals and exhibit a phenomenon known as the capture effect, in which the tuner "captures" the stronger of two stations on the same frequency while rejecting the other (compare this with a similar situation on an AM receiver, where both stations can be heard simultaneously)... An FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes. A high-efficiency radio-frequency switching amplifier can be used to transmit FM signals (and other constant-amplitude signals)... Normal (analog) TV sound is also broadcast using FM... http://en.wikipedia.org/wiki/Kent_Smith Kent Smith (March 19, 1907 -- April 23, 1985) was an American actor who had a lengthy career in film, theater, and television... His biggest successes occurred during the 1940s in films such as Cat People (1942), Hitler's Children (1943), This Land Is Mine (1943), Three Russian Girls (1943), Youth Runs Wild (1944), The Curse of the Cat People (1944), The Spiral Staircase (1946), Nora Prentiss (1947), Magic Town (1947), The Fountainhead (1949), My Foolish Heart (1949), and The Damned Don't Cry! (1950). He continued acting in supporting roles from the 1950s in films such as A Distant Trumpet and made his final film appearance in Billy Jack Goes to Washington (1977)...
Views: 69 Old Movies Reborn
FM Radio Electronics: 'Frequency Modulation: Basic Principles' 1964 US Army Training Film TF11-3482
 
25:37
Curated from the National Archive (https://archive.org). *NOT_ORIGINAL* Please subscribe and like our videos to make them more visible to a wider audience. We hope to make this unique and educational content more accessible to the public. Originally uploaded by Jeff Quitney on 08-09-15. Cited keywords: education educational documentary history film FM Radio Electronics Frequency Modulation Basic Principles US Army Training Film 'Radio Electronics' 'Frequency Modulation' 'Basic Principles' 'US Army Training Film' 'US Army' 'Training Film' instruction instructional carrier 'carrier wave' broadcasting AM 'Amplitude Modulation' static Archives Archive short 'short film' 'short subject' footage classic 1964 1960s 60s 'FM radio' physics Disclaimer: This material is re-uploaded in order to disseminate its content to a wider audience. All material is originally created by various public entities and should therefore be free of copyright restrictions. Nonetheless, if the material (in its entirety or in part) violates your copyright, please let us know what steps you want us to take. Video may display ads monetized by audiovisual copyright holders in some cases or in order to help facilitate the logistics and costs associated with identifying, preparing, and distributing this content. We hope you enjoy these works of knowledge. Please subscribe and like our videos to make them more visible to a wider audience.
Views: 9 Johannes Simon
Frequency Modulation (FM) - Part 1 - Basic Principles by Dept. Of Defense
 
28:37
Publication date 1964 Language English United States Department of Defense PIN 28398 Frequency Modulation - Part 1 - Basic Principles Fundamentals of AM and FM radio communication, how FM eliminates problem of electrical interference, functioning of FM examined in detail. Please note this video is for Public Domain For Educational purposes only. Not for commercial use. Thank you for watching.
Practical Demonstrations of Radio Principles
 
25:47
Check out some of the basic principles and key events that lead to today's radio madness, as portrayed in this In this television footage from the early 1980's DISCLAIMER: I do not know the individuals who posted this, I did not even take the time to inspect their channels for what other content they post. I am rebroadcasting and addressing it to whom it may concern. Do your own research. LEGAL: All audiovisual material in this compilation is owned by its respective posters FAIR USE NOTICE: education; commentary; criticism DISCLAIMER: Video with all eligible to be monetized content monetized towards its creators and right holders; this here channel is not monetized; all rights reserved; all rights not mentioned reserved; no prejudice; no recourse; no endorsement of any kind expressed or implied;
Views: 22 Flat Enough
How a Crystal Radio Set Works
 
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Discover how a crystal set radio works and some of the hints and tips in building them. Crystal radios were used in the early days of radio broadcasting. They used crystal detectors that were known as Cat’s Whiskers because of the thin wire that was placed onto the crystal itself. These radios required no batteries, all the power for the earphones coming from the signal that was received. This video describes how the tuning and selectivity of the crystal radio works. It shows how the tuning capacitor and inductor may be changed to tune in different stations. It then describes the detection of amplitude modulated signals. It shows how a diode detector works. Finally it mentions the transducer and why only headphones are normally suitable for use with crystal radio sets. The basic principles used within crystal radio sets are also employed in other more sophisticated radios, but this demonstrates how the basic radio principles work. The video then provides some useful practical hints and tips about building and using crystal radio sets. More information can be found on our crystal radio pages: https://www.electronics-notes.com/articles/radio/radio-receivers/how-does-crystal-radio-work.php Website: https://www.electronics-notes.com Don’t forget to subscribe to the ElectronicsNotes YouTube channel: https://www.youtube.com/channel/UCj5v6V19CtjoeFzuiiEQpRg
Views: 15870 ElectronicsNotes
19 BSS Interface 3 Basic principles of transmission
 
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On completion of this module you will be able to ... • comprehend how the various types of information like speech and data are transmitted from the GSM network to the customer's mobile station. • list and describe the technological details of the terrestrial interfaces in the Base Station Subsystem. • explain the basics of radio transmission. • explain and describe the particular importance of the GSM air interface from a technological point of view. • define the functions of the different radio channels. • understand and describe the effects of technologies like channel coding and DTX on speech and noise quality in GSM.
Views: 14 Ariel Babalao
The Basic Principles of Networking | JobSearchRadio.com
 
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Listen to the full episode here: http://webtalkradio.net/internet-talk-radio/2018/08/25/the-basic-principles-of-networking-jobsearchradio-com/ Jeff Altman, The Big Game Hunter discusses two basic principles of networking that you must follow.   ABOUT JEFF ALTMAN, THE BIG GAME HUNTER Jeff Altman, The Big Game Hunter is a coach who worked as a recruiter for what seems like one hundred years. His work involves career coaching, all as well as executive job search coaching and life coaching. He is the host of “Job Search Radio,” “No BS Job Search Advice Radio,” and his newest show, “No BS Coaching Advice” and a member of The Forbes Coaches Council. Are you interested in 1:1 coaching, interview coaching, advice about networking more effectively, how to negotiate your offer or leadership coaching? Connect with me on LinkedIn and then message me. JobSearchCoachingHQ.com offers great advice for job hunters—videos, my books and guides to job hunting, podcasts, articles, PLUS a community for you to ask questions of PLUS the ability to ask me questions where I function as your ally with no conflict of interest answering your questions.   If you have a few questions for me and don’t need coaching, contact me through the Magnifi app for iOS (video) or PrestoExperts.com (phone only. Join and attend my classes on Skillshare   Podcasting made easy on WebTalkRadio.net
Views: 8 Jeff Altman
Basic Principles of Frequency Modulation p2-2 (1944) US Army Training Film; Kent Smith
 
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Excellent Army training film in which actor Kent Smith (Cat People...) explains the fundamentals of FM radio. https://en.wikipedia.org/wiki/Frequency_modulation In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. In analog applications, the difference between the instantaneous and the base frequency of the carrier is directly proportional to the instantaneous value of the input-signal amplitude. Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying. FSK (digital FM) is widely used in data and fax modems. Morse code transmission has been sent this way, and FASK was used in early telephone-line modems. Radioteletype also uses FSK. FM modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring. Frequency modulation is known as phase modulation when the carrier phase modulation is the time integral of the FM signal. FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems. In radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling naturally-occurring noise. Radio Edwin Howard Armstrong (1890--1954) was an American electrical engineer who invented wideband frequency modulation (FM) radio. He patented the regenerative circuit in 1914, the superheterodyne receiver in 1918 and the super-regenerative circuit in 1922. Armstrong presented his paper, "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation", (which first described FM radio) before the New York section of the Institute of Radio Engineers on November 6, 1935. The paper was published in 1936. As the name implies, wideband FM (WFM) requires a wider signal bandwidth than amplitude modulation by an equivalent modulating signal; this also makes the signal more robust against noise and interference. Frequency modulation is also more robust against signal-amplitude-fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission, hence the term "FM radio" (although for many years the BBC called it "VHF radio" because commercial FM broadcasting uses part of the VHF band—the FM broadcast band). FM receivers employ a special detector for FM signals and exhibit a phenomenon known as the capture effect, in which the tuner "captures" the stronger of two stations on the same frequency while rejecting the other (compare this with a similar situation on an AM receiver, where both stations can be heard simultaneously)... An FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes. A high-efficiency radio-frequency switching amplifier can be used to transmit FM signals (and other constant-amplitude signals)... Normal (analog) TV sound is also broadcast using FM...
Views: 30 Old Movies Reborn
How Does An Antenna Work? | weBoost
 
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*** It is with sadness that we share that Don, the person featured in this video, passed away in December 2017. Don was a Navy veteran and a valued member of our product engineering team since 2004. He will be greatly missed. Have you ever asked: How does an antenna work anyway? If you have, then you will want to watch this 4-minute video. We ask a guy who designs and tests antennas, Don with weBoost, how antennas work. In the video he explains how an antenna works and why. So whether you're just curious and want an answer to 'how do antennas work.' Or if you want a little background before shopping for the best antenna for your needs, this short video explanation by Don the Antenna Engineer is a good place to start. To learn more about signal boosters visit: https://www.weboost.com/us/ Subscribe to our channel to be in the know when we release our weekly videos. Including Tips, how-to and more. Read more on our blog: https://www.weboost.com/us/news/blog/how-does-an-antenna-work/
Views: 617820 weBoost
Principle of radar
 
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Radar works on the principle of ‘radio echoes’. The term RADAR is an acronym for RAdio Detection And Ranging. It is a system which uses radio waves to detect and to fix the position of targets at a distance. The transmitter in a radar, radiates the high power electrical pulses into space. When these pulses are incident on any distant target such as a mountain, ship or aircraft, they get scattered in all directions. The transmitter antenna receives a part of the scattered energy. This transmitter antenna also acts as receiving antenna for the receiving pulse. The pulse travels with the speed of light 3 × 108 ms–1. In other words, these pulses cover a distance of 300 metres for every micro second. Hence by measuring the time taken by the pulse to reach the target and back to the transmitter, the range or distance of the target can be easily determined. To locate the direction of the target, directional antennas are used.
Views: 21934 Physics4students
What is RF? Basic Training
 
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Everything you wanted to know about RF (radio frequency) technology: Cover "RF Basics" in less than 14 minutes! http://www.nxp.com/products/rf/
Views: 281700 NXP Semiconductors
Introduction to MRI Physics
 
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This is a Lightbox Radiology Education introduction to the physics of Magnetic Resonance Imaging (MRI). For more information on our courses and online e-learning products, visit lightboxradiology.com.au.
ADF Basic Principles of Operation ( to NDB )
 
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Cessna 172 S Simulator. AVN400 -Serviceability -Homing -Tracking/Intercepting -Station Passage Basic ADF navigation to an NDB. Homing the 270 bearing inbound TO the station Intercept for 000 bearing inbound TO the station.
Views: 2656 Karan Parikh
Frequency Modulation Basic Principles
 
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Principios básicos de modulação de radiofrequencia. Tecnologia de manipulação de sinais de radiofrequencia
Views: 207 Ziwox X
Radio Over Internet Protocol (RoIP) Basics
 
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This Tech Episode describes the basic principles of Radio over Internet Protocol (RoIP) used in many JPS Interoperability Products, like the ACU line of interoperability gateways
Views: 8858 JPS Interop Channel
Phase Locked Loop Tutorial | PLL Basics
 
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Phase locked loops are used in many radio frequency of RF systems. Phase locked loops are used in radios, as FM detectors as well as within frequency synthesizers that form the local oscillator within radio receivers. These and very many other applications mean that phase locked loops, PLLs are a key building block within a variety of radio and RF systems. A phase locked loop consists of a phase detector, voltage controlled oscillator and a loop filter as well as a reference signal source. Within the phase locked loop, the incoming reference hits the phase detector along with a signal from the PLL voltage controlled oscillator. A signal proportional to the phase difference between the two is generated and this is passed through a loop filter to remove unwanted signals. The resulting error signal is applied to the input of the voltage controlled oscillator with the effect that the phase between the reference and the VCO signals is reduced. Eventually a point is reached where a steady fixed phase difference exists. At this point the phase lock loop is said to be in lock and the frequency of the reference and VCO are exactly the same. Using the basic phase locked loop, it is possible to achieve a wide variety of functions, but possibly they are most widely known for their use in frequency synthesizers. Here they enable a single highly stable frequency source to be used to generate a host of other frequencies, all with the same accuracy as the reference. This phase locked loop tutorial gives all the basics required for an understanding of PLL technology. More information can be found at: https://www.electronics-notes.com/articles/radio/pll-phase-locked-loop/tutorial-primer-basics.php Associated website: https://www.electronics-notes.com Don’t forget to subscribe to the ElectronicsNotes YouTube channel: https://www.youtube.com/channel/UCj5v6V19CtjoeFzuiiEQpRg
Views: 158833 ElectronicsNotes
How do the Altimeters work and what is a Flight Level?
 
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https://brilliant.org/MentourPilot/ In this video I will give you an insight into how pilots use the altimeters onboard the aircraft, how they work and why we use Flight levels above certain altitudes. It is an overview of the subject and for more knowledge of the physics behind i recommend you to check out our Sponsor, Brilliant.org, using the link above. To get the answer to the question in the video, check the following link: Https://Brilliant.org/MentourEdge/ To download the Mentour Aviation app, use links below: IOS: https://appstore.com/mentouraviation Android: https://play.google.com/store/apps/details?id=com.teamta.mentouraviation
Views: 84108 Mentour Pilot
Lesson 6.1 Antenna Basics
 
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General Class Ham Radio instructional video, introduces Section 6.1 in the ARRL General Class License Manual. The section is extremely short - meaning too short. So I do the opposite. Here's 20 minutes of introduction that will help you truly understand what's going on. With this background, the rest of Section 6 will be a breeze! You can see this video in context by going to ke0og.net/general, which has an introductory video as well as links to all of the General Class instructional videos. Check out ke0og.net/training for the introductory videos for the Technician Class license.
Views: 184677 David Casler