Search results “Transmitting television signals”
How Television broadcast works
How Television broadcast works
Views: 171138 Daniel Izzo
How is digital TV different from analog?
This clip makes two points. First, analog's signal is different than digital's because it talks to the tuner in a different way. Second, the only thing that's changing in your television is that it needs a new tuner to understand the digital signal. Bill Hayes and Gary Sgrignoli explain. Visit http://iptv.org/digital/ or call 1(800)532-1290 for more information. See also Step-by-step DTV: http://www.iptv.org/iowajournal/story.cfm/419
Views: 102686 IowaPublicTelevision
TV From the Moon: Are you INSANE?
The great NASA HOAX continues: TV from the MOON? Yes, when you see the details on the power needs you will realize it is totally insane. The earth is flat, the moon is a light and Apollo nothing went there. Get rid of pride and wake up to the light. Coming soon: PeopleForPeople.Life - groups and social media and people helping others - all FREE from social media, censorship and payment. Video Links: https://en.wikipedia.org/wiki/List_of_North_American_broadcast_station_classes https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090016295.pdf https://en.wikipedia.org/wiki/Apollo_TV_camera No Fake Religion Channel: https:\\www.youtube.com\c\nofakereligion The Edge Of Truth: http://www.theedgeoftruth.com/ Twitter: @mrthrivesurvive
Views: 165010 MrThriveAndSurvive
DIY: Build Your Own Television Broadcaster
COPYRIGHT ISSUE FOUND: Some video portions are muted. Material used complies under the "Fair Use Law", per U.S. Supreme Court. It is used for demonstrating a home-made electronic gadget. =============================================== LEGAL: The FCC requires you to apply for a Broadcaster's Liscence if your signal is stronger than 300 feet, or 100 meters in Canada (apply to your com branch). I actually figured out, through trial and error, how to build a TV broadcaster, with common Radio Shack equipment. HOW-TO: You will need a Composite-to-RF Converter, to broadcast non-RF content on TV. This is not needed if you are using an RF source. It's output is the channel this will work on. Where it says OUT TO TV, or TO TV, hook this signal to your first amplifier (a 20dB adjustable one recommended). From the output of this amp, attach it to the input of the next amplifier (a 10dB will be fine for a typical suburban install). At this point, if you are to get a liscence, or results are too weak, repeat with a third amplifier (ifyou can't get a 20dB one, and you're stuck with 10dB or lesser). Finally, attach the output of the final amp to a set of COLLAPSED rabbit-ears (another gain control. Adjusting length adjusts output). This will work with analog signals, but if you have anything that outputs digitally in RF, it should work as well. The following is a setup for use on channels 3 and 4. Higher channels, will require more amps, and more power, especially UHF. USING AN OUTDOOR (Arial) ANTENNA FOR THE TRANSMITTER NOT RECOMMENDED. Output will be too weak for good use, and stronger signals may go past 300 feet. This is explained below: This is where you hook up your device (game console, DVD player, etc.), and place the broadcaster and antenna next to the TV to use this device. Set the TV to the channel used, and fully stretch rabbit ears flat, to receive best signal nearest that of a direct connection. If it's too snowy, adjust the gain. If it hums and the colors are weak, reduce the gain until it looks correct. Next, try this out of the farthest TV, within 50 feet, and see if it gets a USABLE signal. If the picture is snowy, in color, and the sound crackles a little, you have it setup PERFECTLY! The idea is to spy on people, and to have "good enough" results on the far end of the house. ============================================= NOTICE: This setup (demonstrated) goes up to 50 feet with collapsed rabbit ears. FOR THE SAKE OF DEMONSTRATION, it was applied to the roof antenna, and went well beyond the 300 feet maximum. This is NOT how I use it. Do not try this, even if the overall distance is proper, because the TV's in the house will likely not get good results. ALWAYS used rabbit ears for the transmitting antenna. At the end, I rushed it, because 15 minutes came fast. I stopped the video at 15 minutes exactly, or so the camera said. Guess what? The actual upload limit is 15:59, because this is 15:02, and was accepted. DISCLAIMER: Make sure your setup is not receivable (or not usable enough) to neighbors, as copyright violations may occurr. This is intended for one household, so you got to play with it, to make it legal in many ways.
Views: 75726 georgef551
How Does An Antenna Work? | weBoost
*** 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: 600847 weBoost
For more information: http://www.7activestudio.com [email protected] http://www.7activemedical.com/ [email protected] http://www.sciencetuts.com/ [email protected] Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. COMMUNICATION SYSTEMS: BANDWIDTH OF SIGNAL: In a communication system, the message signal can be voice, music, picture or computer data. Each of these signals has different ranges of frequencies. The type of communication system needed for a given signal depends on the band of frequencies which is considered essential for the communication process. For speech signals, frequency range 300 Hz to 3100 Hz is considered adequate. Therefore speech signal requires a bandwidth of 2800 Hz 3100 hertz – 300 hertz for commercial telephonic communication. To transmit music, an approximate bandwidth of 20 kHz is required because of the high frequencies produced by the musical instruments. The audible range of frequencies extends from 20 Hz to 20 kHz. Video signals for transmission of pictures require about 4.2 MHz of bandwidth. A TV signal contains both voice and picture and is usually allocated 6 MHz of bandwidth for transmission.In the preceeding paragraph, we have considered only analog signals. Digital signals are in the form of rectangular waves as shown in Figure. However, for practical purposes, the contribution from higher harmonics can be neglected, thus limiting the bandwidth. As a result, received waves are a distorted version of the transmitted one. If the bandwidth is large enough to accommodate a few harmonics, the information is not lost and the rectangular signal is more or less recovered. This is so because the higher the harmonic, less is its contribution to the wave form.
Views: 124761 7activestudio
Cable Basics; Transmission, Reflection, Impedance Matching, TDR
Instruments such as the Analog Arts ST985 (www.analogarts.com), based on the TDR and wave transmission concept, characterize the length, impedance, and other characteristics of a cable. When a signal travels through a cable, it is undisturbed until it encounters an impedance change, and if it encounters an open circuit, all of the wave reflects back to the source. The characteristic impedance of the cable and the load impedance, determine what happens to the signal at the load. A higher load impedance reflects a part of the signal back to the source. There is no reflection when the load impedance is smaller than the impedance of the cable. However, smaller loads cause signal loss. An equal load impedance prevents signal reflection while delivering maximum amount of power to the load. An impedance mismatch can happen whenever the signal medium changes. For example, when the source is connected to the cable or at the load. These mismatches cause reflection and signal loss. In general, the source output impedance, cable characteristic impedance, and load impedance must be made equal for optimal performance. Impedance matching maximizes the power transfer to the load and eliminates signal reflection. A perfect impedance matching transfers half of the source power to the load. When the signal wavelength becomes a significant portion of the cable length, without a proper termination, reflection distorts the signal. The reflected wave changes the amplitude of the signal throughout the cable. At the source, it acts like a load, which if not properly addressed, can damage the signal generator. At certain frequencies, the reflected wave interferes constructively with the signal. The resultant signal is referred to as a standing wave. A TDR consists of a pulse generator, a monitoring instrument device, and a DSP. Generally, in these instruments, the generator outputs a fast transition pulse. This pulse travels to the end of the cable and reflects back. But first it is divided by the voltage divider formed due to the source resistance and the cable impedance. The division factor is then calculated based on which the impedance of the cable is found. The divided signal travels through the cable at a fraction of the speed of light in vacuum. This fraction is referred to as the velocity factor of the cable. For a coax it is about point 67. The time it takes for the signal to reach the end of the cable and reflect to the source, is used to calculate the length of the cable. Impedance matching maximizes the power transfer to the load and prevents reflection. Damaging a cable, by twisting, bending, or kinking, or placing improper signal connectors in the signal path cause an impedance mismatch resulting in reflection, and consequently less than ideal signal handling.
Views: 15646 Academia
Broadcasting Analog TV on an ESP8266!
Using a digital pin, shifting out a signal at 80 MHz to broadcast analog tv to an analog tv on channel 3. Whooh! Github: http://github.com/cnlohr/channel3 I was playing around with the I2S bus on the ESP8266 and found that it could output the I2S port at 80 MHz and still maintain the DMA! This is actually generating disruptions at the right frequency to be picked up by my analog TV and display NTSC video!
Views: 149619 CNLohr
Lecture - 26 TV Transmission
Lecture Series on Communication Engineering by Prof.Surendra Prasad, Department of Electrical Engineering ,IIT Delhi. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 56102 nptelhrd
Radio Basics: "Sending Radio Messages" 1943 ERPI Classroom Films
Support this channel: https://www.patreon.com/jeffquitney Electronics playlist: https://www.youtube.com/playlist?list=PLAA9B0175C3E15B47 Radio Broadcasting & Old Time Radio playlist: https://www.youtube.com/playlist?list=PL18A480E27C4EDD07 Shortwave & Military Radio playlist: https://www.youtube.com/playlist?list=PLA4AC5A9478CECACC more at http://scitech.quickfound.net/ "Much great footage of radio equipment and animated radio waves also great footage of radio operators on land, sea and air." Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied. The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original). https://en.wikipedia.org/wiki/Radio Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/ Radio is the transmission of signals through free space by electromagnetic waves with frequencies significantly below visible light, in the radio frequency range, from about 3 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information, such as sound, is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form... Transmitter and modulation Each system contains a transmitter. This consists of a source of electrical energy, producing alternating current of a desired frequency of oscillation. The transmitter contains a system to modulate (change) some property of the energy produced to impress a signal on it. This modulation might be as simple as turning the energy on and off, or altering more subtle properties such as amplitude, frequency, phase, or combinations of these properties. The transmitter sends the modulated electrical energy to a tuned resonant antenna; this structure converts the rapidly changing alternating current into an electromagnetic wave that can move through free space (sometimes with a particular polarization). Amplitude modulation of a carrier wave works by varying the strength of the transmitted signal in proportion to the information being sent... It was the method used for the first audio radio transmissions, and remains in use today. "AM" is often used to refer to the mediumwave broadcast band (see AM radio). Frequency modulation varies the frequency of the carrier. The instantaneous frequency of the carrier is directly proportional to the instantaneous value of the input signal... FM is commonly used at VHF radio frequencies for high-fidelity broadcasts of music and speech (see FM broadcasting). Normal (analog) TV sound is also broadcast using FM... An antenna (or aerial) is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified. An antenna can be used for both transmitting and receiving... Once generated, electromagnetic waves travel through space either directly, or have their path altered by reflection, refraction or diffraction. The intensity of the waves diminishes due to geometric dispersion (the inverse-square law); some energy may also be absorbed... Electrical resonance of tuned circuits in radios allow individual stations to be selected. A resonant circuit will respond strongly to a particular frequency, and much less so to differing frequencies. This allows the radio receiver to discriminate between multiple signals differing in frequency... The electromagnetic wave is intercepted by a tuned receiving antenna; this structure captures some of the energy of the wave and returns it to the form of oscillating electrical currents. At the receiver, these currents are demodulated, which is conversion to a usable signal form by a detector sub-system. The receiver is "tuned" to respond preferentially to the desired signals, and reject undesired signals. Early radio systems relied entirely on the energy collected by an antenna to produce signals for the operator...
Views: 24870 Jeff Quitney
Video Links: (1st part) RussianVids Interview With Filmmaker - Movie Producer Joe Frantz https://youtu.be/k6TbhBISRbE?t=17m39s ("analysis" 2nd part) Engineer Dismantle NASA Claim of Distant Audio/Video Transmission https://www.youtube.com/watch?v=VkCdBJPZtZs ("intermission" part) 1983: STS-8 Challenger (NASA) https://www.youtube.com/watch?v=ZJw5lE9089o Also, feat.: Moon Landing Hoax | Rubber Baby Buggy Bumpers (min25) https://www.youtube.com/watch?v=To9B199L48k 100 Percent proof we can't orbit earth. Debunk This. https://www.youtube.com/watch?v=0Yp0rNR9pbk 🔘 NASA BUSTED! - SPACE FAIL https://www.youtube.com/watch?v=H1tPOEBUAs8 Eric Dubay NASA Fail Compilation https://www.youtube.com/watch?v=msY3xc8pVLE Chinese Space Lab is FAKE like NASA ✞ https://www.youtube.com/watch?v=m5VPxXMvSPI Nasa astronaut Don Pettit: Next logical step is to go back to the Moon Can not go to the Moon anymore. Lost The Technology - European Space Agency's ambitions to reach the Moon and Mars :-( https://www.youtube.com/watch?v=z2CAkf124KY ---- Otto Binder hobby radio operators have received talks from Apollo 11 astronauts by an own VHF receiver www.top-specials99.com/atmosphaerenfahrt/24_moon-films-radio-transmissions-aliens-fake-ENGL.html ---- From Wikipedia, the free "encyclopedia" hehe :) Earth–Moon–Earth communication (EME), also known as moon bounce, is a radio communications technique that relies on the propagation of radio waves from an Earth-based transmitter directed via reflection from the surface of the Moon back to an Earth-based receiver. The use of the Moon as a passive communications satellite was proposed by W.J. Bray of the British General Post Office in 1940. It was calculated that with the available microwave transmission powers and low noise receivers, it would be possible to beam microwave signals up from Earth and reflect off the Moon. It was thought that at least one voice channel would be possible.[1] The "moon bounce" technique was developed in parallel by the United States military and the Hungarian group lead by Zoltán Bay in the years after World War II. The first successful reception of echoes off the Moon being carried out at Fort Monmouth, New Jersey on January 10, 1946 by John H. DeWitt as part of Project Diana.[2] It was followed by Zoltan Bay's group on February 6, 1946.[3] The Communication Moon Relay project that followed led to more practical uses, including a teletype link between the naval base at Pearl Harbor, Hawaii and United States Navy headquarters in Washington, DC. In the days before communications satellites, a link free of the vagaries of ionospheric propagation was revolutionary. Later, the technique was used by non-military commercial users, and the first amateur detection of signals from the Moon took place in 1953. and.. Seventy Years Ago, We Bounced Signals Off the Moon for the First Time https://motherboard.vice.com/en_us/article/ezpnde/seventy-years-ago-we-bounced-signals-off-the-moon-for-the-first-time
Views: 66155 John Farpoint
How Radio Waves Are Produced
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: 763094 AtomModel
How Analog Video Works
There are a lot of short videos on analog video, but you'd have to watch a lot of them to get the full picture, and there's a fair bit of misinformation out there. This video is for my students in media technical theory class, but I hope that others will enjoy it. Here's a fundamental explanation of how NTSC analog video works. Even in today's digital video universe, it's good to know the elements of analog video, as we're still living in an analog world, and because digital video equipment still starts off as analog.
Views: 157196 Dana Lee
Alien Voice hijacks live TV broadcast
Check my chanel and SUBSCRIBE for more just like this! The Southern Television broadcast interruption was a broadcast interruption through the Hannington transmitter of the Independent Broadcasting Authority in the United Kingdom at 5:10 PM on 26 November 1977. It is generally considered to be a hoax, but the identity of the intruder is unknown.
Views: 339220 creepypaste
How do antennas work?
If you have an RC model plane, boat, helicopter, car or drone and want to know how antennas work then this video will hopefully explain some of the basics. More on antenna gain: https://www.youtube.com/watch?v=Bx7gMUw1MGw
Views: 281511 RCModelReviews
Turn your old VHS video player into a TV transmitter.
Turn your old VHS video into a TV transmitter ! Our best FM transmitter 50% off ! http://www.bug-transmitter.com/ Parts you need are: One VHS video player And one Signal Booster Philex 1 Way TV Aerial Signal Booster
Views: 58732 dazaro3
Transmitting NTSC/ATSC Video With the HackRF One and Gnuradio
LOOK BELOW FOR INFO AND SHORTCUTS: In this video I show how to transmit both analog and digital NTSC/ATSC TV signals using the HackRF One with Gnuradio from a windows environment, though this can also be done from various linux distributions or virtual machines. The essential video breakdown is as such: Part 1: introduction to the signals we will be broadcasting and a look into each signal's RF footprint and modulation techniques used Part 2: Flow graph overview and broadcast of a static image using analog NTSC. 11:28 Part 3: Broadcasting analog NTSC video and examining the received signal. 13:33 Part 4: Broadcasting digital ATSC video using an mpeg2 transport stream. 18:29 Part 5. Broadcasting digital ASTC video in real time using OBS Studio and ffmpeg. 21:06 Links: NGINX with RTMP for windows: https://github.com/illuspas/nginx-rtmp-win32 Gnuradio Windows installers: http://www.gcndevelopment.com/gnuradio/downloads.htm VE3IRR's repository: https://github.com/argilo/sdr-examples The graphs and scripts I used: https://drive.google.com/open?id=1ie-41BLrfp8yNX1PqZbK_uao0-lfIW1g FFMPEG args: ffmpeg -i rtmp://localhost/live -r 30 -vcodec mpeg2video -acodec ac3 -b:a 192k -b:v 18M -minrate:v 18M -maxrate:v 18M -flags +ildct -muxrate 19390.4k -f mpegts udp:// Disclaimer: The sample videos used for transmission (Simpsons Movie Trailer, DivX sample file) and background music in this video are the exclusive property of their respective owners and not mine, I do not claim any ownership. Tracklist: Kooce - Tango slowly, slowly - hardwareloop1 Above and Beyond - Tight Rope cyberlust - future interactions glue70 - Highway Broken Jullien Hauspie - Death Stranding Theme Korg Tennyson - Pancake Feet Inside Machina - Perpetual Emotion
Views: 4531 Vladislav Fomitchev
How to Watch HD Cable TV WIRELESS on MULTI TVs, works for PS3, PS4 & XBOX
How to setup and connect to Watch HD cable TV service wirelessly on 2 TVs But to get free wireless TV is to use off-air antenna then auto scan TV HDTV channels Actiontec hdmi transmitter transmits audio and video wirelessly to another TV over 50 feet away without running or fishing or installing HDMI cables or wires Works with HD receivers and PS3 and Xbox 360 or Wii U or PS4 and satellite boxes like Directv or Dish network too Actiontec MywirelessTV review "wireless TV"
Views: 435682 Tampatec
How To Make Your Own TV Station
📖📕 GET THE NEW TINKERNUT BOOK: http://bit.ly/Tinkernutbook 📕📖 Take advantage of the switch to digital, by using the old analog stations to broadcast your very own television show. For a more in-depth look at setting up a TV station, visit this link: http://www.instructables.com/id/How-To-Save-Analog-TV
Views: 334519 Tinkernut
How To Connect 2 TV Wireless
This video shows you how to connect two tvs wireless. And this will make you have a smart tv. How To Connect two TV Wireless. connect your cable box to two TVs, you'd need to connect the box's HDMI out port to the wireless transmitter to send the signal to the TV in a different room and use one of the other connection cables HDMI, coaxial, RCA composite, etc to connect to the TV near the cable outlet. Connecting multiple televisions to a single set top box is possible in most domestic situations. Being able to have two TVs supported by a lone set top box means not having to buy a second one for another room. This is ideal for people who want to watch the same TV show in the kitchen, for example, while it is also being shown in the den or living room. It should be noted, however, that a set top box that is plugged into two, or more, separate television sets will only be able to show the same program. If another channel is selected on the set top box, then this will be the one that is showing on both TVs. However, since the audio control is usually held in the TV rather than the set top box, the volume should be able to be adjusted from the TV's own remote control. Having two TVs attached to a single set top box means that the controller is only likely to work in one room. Since not all set top boxes have coaxial cable connectors, it may be desirable to use an HDMI output instead. HDMI splitters work in a similar way to coaxial Y adapters but some are more like miniature hubs with three, or more, outputs. Due to the signal loss involved, these units are often powered and some have remote controls, which allows for the particular signal path to be selected. Wireless Cable TV - allows you to independently watch different ... Just connect the Transmitter to your analog cable and the Receiver to a TV in ... RF Coax Cable Splitter Included; Two Way Communication; 4 Selectable Frequencies. The Nyrius ARIES Prime Wireless HDMI Transmitter enables you to watch what you want by streaming from your laptop or any HDMI device to your TV in razor sharp, uncompressed 1080p high definition video with absolutely no loss in picture quality – it’s like an invisible HDMI cable. Mobile Phone or Tablet to your TV Wireless. connect two tvs to one hd box connect to Watch HD cable TV service wirelessly on 2 TVs Connect 2 TV's to one receiver how to split directv signal to two tvs hdmi how to split directv signal to another tv how to split directv receiver to multiple tvs. How to setup connect to Watch cable TV service wirelessly on 2 TVs. Connect a Laptop to a Smart TV Wirelessly.
Views: 115953 Danny S Hodges
5 Strangest Radio Stations & Most Mysterious Transmissions
From an unexplained Russian radio station playing strange sounds, to the infamous Yosemite Sam broadcast... Here are five eerie radio stations and transmissions from around the world! ____________________________________________________________________ Don't forget to follow TOP5s on Social Media to keep up with upcoming videos, articles and new information! ►► https://twitter.com/TheTop5s ►►https://www.facebook.com/TheOfficialTop5s/ Special Thank you to CO.AG for the music as usual! If you are looking for music for any video production, games, movies etc. He is the man to speak to so check out his channel or send him a personal message! https://www.youtube.com/channel/UCcavSftXHgxLBWwLDm_bNvA Thanks for watching! Top5s
Views: 879691 Top5s
How to Install a Wireless TV Satellite & Cable Audio Video Transmitter to Save Money
Purchase transmitter on Amazon at http://amzn.to/IrsWMw. Visit http://drlalford.ecrater.com for training or a consultation.
Views: 143324 Tish Alford
Basic VHF and UHF Fundamentals
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: 189193 Dan Vanevenhoven
Radio - broadcasting and reception - Science
This is a science video for Grade 10 students that explains radio broadcasting and reception. RADIO BROADCASTING AND RECEPTION Using the basic principles of radio and TV communication, radio communication is achieved through various stages which are explained as follows: a) PRODUCTION OF SOUND AND MODULATED WAVE: In a studio the song rendered by a person is converted into electrical signals using a microphone. These signals are in the audio frequency (AF) range. An oscillator circuit produces suitable rf carrier wave. b) RADIO TRANSMITTER: The audio signal and r f waves are combined in the modulator or transmitter. The modulated waves are fed to an antenna fixed on a tower. The transmitting antenna broadcasts the modulated rf waves into space. c) RADIO RECEIVER: The aerial of a radio receiver receives the modulated waves from different transmitting stations. The tuning circuit selects only desired signals. The detector cirxcuits extracts or demodulate the af signal which is fed to an amplifier. The amplified electrical signals are fed to a speaker and converted into music or speech.
Views: 13492 Elearnin
Wireless Video Transmission Broadcast Guide - Part 1
Wireless video HDMI & HD SDI, Transmitter & Receiver systems such as cellular bonding, unlicensed Wi-Fi, COFDM, 60GHz, microwave. etc, are discussed. http://vidovation.com/wireless-video-users-guide The Wireless Video Transmission Broadcast Guide covers: Selection Criteria Supported Bit Rates Link Distance Video Interfaces Video Formats and Compression Initial and Recurring Costs License vs. Unlicensed Spectrum Portability Antenna Types Wireless Applications Sports News Gathering Grab-and-Go Anywhere Camera's Television and Film Production Confidence Monitoring Video Assist and On-set Monitoring Wireless Technologies Traditional Private Microwave Unlicensed Wi-Fi 4G LTE/Bonded Cellular 60 GHz Uncompressed HDMI & HD SDI Summary: New technologies have greatly expanded the number of choices available to broadcasters for transporting live video from venues to studios. For example, cell-phone circuit bonding has now made it possible to transmit live video from anywhere that has good cellular coverage. Recent advances in Wi-Fi standards have increased the bitrates available for transporting video in local areas. Today, even uncompressed HD video can now be transported wirelessly using 1.5 Gigabit radio links operating at 60 GHz. Each technology has benets and drawbacks, relative to specic applications and user environments. Wireless video transport has been a key part of television broadcasting since the rst over-the-air transmission tests were performed almost a century ago. The methods used to transport video signals from one location to another have continued to push the limits of each new technology that has come along, including coaxial cable, microwave, satellite, ber optics and cellular radios. With high bandwidth signals, demanding QoS (Quality of Service) requirements and sensitivity to excessive delay, video has often been at the leading (or bleeding) edge of the capabilities of many technologies. Building on these past successes, television broadcasters today have an enormous range of wireless video transport options. These range from dedicated links that support 1.5 Gbps uncompressed HD video to highly compressed video streams that run over Wi-Fi infrastructure. In between are devices and systems to t virtually every application. With so many choices, it can be dicult to select a suitable product that oers the best combination of performance and reliability at a price point that makes sense for each project. Modern modulation technologies can pack more bits into a given amount of channel bandwidth. Changing from a modulation technique that uses two bits per symbol (such as QPSK) to one that uses four bits per symbol (such as 16QAM) will double the bit rate on a wireless link without changing the channel bandwidth. There is, of course, a cost in doing this, with more processing power needed on both ends of the connection to generate and detect these more complex signals. Plus, there is another penalty associated with the more complex modulation schemes: they are more sensitive to noise and interference. This is why Wi-Fi signals, among others, will automatically adjust their modulation (and consequently bit rate) between more simple and more complex schemes to adapt to changing RF channel conditions. Exerpt from 60GHz Section: New high-speed semiconductor technology has enabled the development of aordable, compact wireless systems that can operate in the unlicensed 60 GHz frequency range. 60 GHz systems on the market today oer completely uncompressed HD-SDI operation at 1.5 Gbps, including any embedded audio channels, metadata, SMPTE time code, etc. Because the signals are uncompressed, no encoding/decoding delay is present in the system, making it ideal for sports, live interviews and other time-sensitive applications. Solutions are also available in the 70/80 GHz and the 90 GHz frequency bands, including high speed Ethernet links that can support bi-direction GigE speeds, which is great for high performance IP video and audio networking. Signals operating at these very high frequencies Example Specifications: Fixed Portable Unlicensed Bonded 60 GHz COFDM Microwave Microwave Wi-Fi Cellular HDMI HD SDI Transmitters Recievers Uncompressed Bit Rates 20-50 Mbps 5-50 Mbps 5-200 Mbps 1-20 Mbps 1.5 Gbps Link Distance 1-50 km 1-10 km 0.1-5 km N/A 300-500m Video Interfaces ASI, SDI, HD-SDI ASI, SDI, HD-SDI SDI, HD-SDI, IP SDI, HD-SDI HD-SDI Video Compression Antenna Types Parabolic Parabolic Omni or Dish Omni (typical) Parabolic Connect with us: Contact Us - http://vidovation.com/index.php?route... Blog - http://www.vidovation.com/blog Facebook - http://www.facebook.com/VidOvation Google+ - http://gplus.to/vidovation Twitter - http://www.Twitter.com/jimjachetta Pinterest - http://www.Pinterest.com/jimjachetta LinkedIn - http://www.linkedin.com/in/jimjachetta
Holy smoke Jeanne Moos reports unclarities in transmitting tv signals
Seagull researches messaging and meditates about a truly European bird certificate for the safe application of sustainable technology.
Views: 387 Bert Kerkhof
Broadcasting Digital TV w/ BladeRF - Part 2/2 - Software Defined Radio Series #22
In this video I show how to broadcast our own digital TV signal! Hardware: - BladeRF (x40) - DVB-T Transmitter - RTL-SDR #1 (E4000) - DVB-T Receiver - RTL-SDR #2 (R820T) - SDRSharp viewer Topics covered: - Transmitting a DVB-T signal - Verifying the signal visually - Using w_scan to scan for DVB-T channels - Using vlc to view a DVB-T frequency - Configuring channels.conf for mplayer - Using mplayer with the correct demuxer (lavf) - Checking system resource usage while viewing DVB-T channels Channels.conf details: (Make sure to change the frequency if you're not transmitting on 522MHz) service_id 1:522000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_AUTO:FEC_AUTO:QAM_AUTO:TRANSMISSION_MODE_AUTO:GUARD_INTERVAL_AUTO:HIERARCHY_AUTO:69:68:1 Script usage: (Make sure to set the frequency you want to transmit on, and make sure you have loaded the FPGA, and last but not least, that you're pointing to the correct MPEGTS file.) ./dvbt-blade.py -m t8k -c 8 -C qpsk -r 7/8 -g 1/32 -f 522e6 ~/Desktop/file.ts Notes for when it doesn't work: Sometimes it's not going to work, despite that you've done exactly as I did in my video. In that case, unplug the devices, try switching USB ports, don't use USB hubs for the bladeRF and RTL-SDR that decodes the DVB-T signal, and pray to the "demo gods", in case you're demonstrating this to someone else. In my case, I actually just waited a bit, and did something else for 30 minutes, came back, and did exactly the same thing again, and then it worked. Tools: - BladeRF (http://nuand.com/) - gr-dvbt (https://github.com/BogdanDIA/gr-dvbt) - dtv-utils (https://github.com/drmpeg/dtv-utils) - w_scan (w-scan with apt-get) - sdr# (sdrsharp, http://airspy.com/download/ & https://github.com/jmichelp/sdrsharp-bladerf) - iostat (sysstat with apt-get) - mplayer Melodysheep - The Good of the One - Spock tribute: https://www.youtube.com/watch?v=2vNBA8mHFf8 Stay tuned and subscribe for more upcoming videos showing actual hacks! Twitter: @CrazyDaneHacker Facebook: https://www.facebook.com/crazydanishhacker Patreon: https://www.patreon.com/crazydanishhacker
Views: 3622 Crazy Danish Hacker
TV Transmitter
Analog TV Transmitter. According to an article published on wikipedia, the analog TV transmission is separate in two parts. The video is transmitted using an Amplitude Modulated (AM) signal and the audio using a Frequency Modulated (FM) signal. My idea was to have two transmitters so I would be able to transmit two signals with different modulation structures. The issue was that by tuning both transmitters to a close frequency one interfered in the other, so I decided to tune the audio frequency in a higher frequency to avoid interference and used a radio to receive the audio signal. Below are the links to the schematics I have based my project on: Video transmitter based on the circuit available at: http://www.circuitdiagram.org/tv-transmitter-circuit.html Audio Transmitter based on the circuit available at: http://www.newtoncbraga.com.br/index.php/mini-projetos/174-transmissores-e-receptores/6859-transmissor-de-fm-min121
Views: 25195 Paulo Ramos
Using IR Signals to Control TV
Use a IR receiver to collect codes and send them to your TV with an IR transmitter. Alexa and IR Project: https://youtu.be/44hbAwgX4T0 Materials: IR Receiver and Transmitter: https://www.amazon.com/gp/product/B00EFOQEUM/ref=oh_aui_detailpage_o06_s02?ie=UTF8&psc=1 100 ohm resistor: https://www.amazon.com/Projects-25EP514100K-100k-Resistors-Pack/dp/B0185FCGEY/ref=sr_1_2_sspa?ie=UTF8&qid=1517577758&sr=8-2-spons&keywords=100+ohm+resistor&psc=1 Sketches: https://github.com/Grensom/IR-Project IR_REMOTE_read: https://github.com/Grensom/IR-Project/blob/master/IR_REMOTE_read.ino IR_REMOTE_send: https://github.com/Grensom/IR-Project/blob/master/IR_REMOTE_send.ino
Views: 16156 Grensom
Electromagnetic Spectrum: Radio Waves
http://www.facebook.com/ScienceReason ... [email protected]: EMS Electromagnetic Spectrum (Episode 2) - Radio Waves The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object. --- Please SUBSCRIBE to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/ScienceTV • http://www.youtube.com/FFreeThinker --- MEASURING THE ELECTROMAGNETIC SPECTRUM The electromagnetic (EM) spectrum is just a name that scientists give a bunch of types of radiation when they want to talk about them as a group. Radiation is energy that travels and spreads out as it goes - visible light that comes from a lamp in your house and radio waves that come from a radio station are two types of electromagnetic radiation. Other examples of EM radiation are microwaves, infrared and ultraviolet light, X-rays and gamma-rays. Hotter, more energetic objects and events create higher energy radiation than cool objects. Only extremely hot objects or particles moving at very high velocities can create high-energy radiation like X-rays and gamma-rays. • http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html --- RADIO WAVES Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Like all other electromagnetic waves, they travel at the speed of light. Naturally-occurring radio waves are made by lightning, or by astronomical objects. Artificially-generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, satellite communication, computer networks and innumerable other applications. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight. Discovery and utilization: Radio waves were first predicted by mathematical work done in 1865 by James Clerk Maxwell. Maxwell noticed wavelike properties of light and similarities in electrical and magnetic observations. He then proposed equations, that described light waves and radio waves as waves of electromagnetism that travel in space. In 1887, Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by experimentally generating radio waves in his laboratory. Many inventions followed, making practical the use of radio waves to transfer information through space. Propagation: The study of electromagnetic phenomena such as reflection, refraction, polarization, diffraction and absorption is of critical importance in the study of how radio waves move in free space and over the surface of the Earth. Different frequencies experience different combinations of these phenomena in the Earth's atmosphere, making certain radio bands more useful for specific purposes than others. Radio communication: In order to receive radio signals, for instance from AM/FM radio stations, a radio antenna must be used. However, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune in to a particular frequency (or frequency range). This is typically done via a resonator (in its simplest form, a circuit with a capacitor and an inductor). The resonator is configured to resonate at a particular frequency (or frequency band), thus amplifying sine waves at that radio frequency, while ignoring other sine waves. Usually, either the inductor or the capacitor of the resonator is adjustable, allowing the user to change the frequency at which it resonates. In medicine: Radio frequency (RF) energy has been used in medical treatments for over 75 years generally for minimally invasive surgeries and coagulation, including the treatment of sleep apnea. • http://en.wikipedia.org/wiki/Radio_waves .
Views: 389702 Best0fScience
SDR Transmit ATSC 8VSB to Digital Television with HackRF SDR
Transmitting 8VSB Digital tv via a cheap HackRF SDR. GRC File: http://s000.tinyupload.com/?file_id=57830321324111959890 TS File formatted to ATSC: http://www.w6rz.net/advtimedvb.ts Frequency for Digital CH 14: 470.31mhz Don't forget to subscribe for more great content: https://www.youtube.com/c/corrosive?sub_confirmation=1 Help support my channel and new videos with my Patreon and amazon affiliate links My Amazon Influencer Storefront: https://www.amazon.com/shop/corrosiveone Free Audible Trial Get TWO books free: https://amzn.to/2y4R5HU: https://www.patreon.com/corrosive/memberships RTL-SDR Kit With Antenna: https://amzn.to/2LaBlF1 Stand Alone RTL-SDR: https://amzn.to/2JiWwHJ L-Band Satcom Filter and LNA: https://amzn.to/2LdQkOk HackRF w/Antenna Bundle: https://amzn.to/2Lf6OWq Need a solid VPS for your projects? Try Digital Ocean and help us in the process! Free $10 credit gets you upto 2 months of free services! https://m.do.co/c/e06db5f4ae1c Disclaimer: Some of these links are affiliate links where I'll earn a small commission if you make a purchase. Shopping through these links is a great way to support the channel so I can keep making helpful videos for you.
Views: 1897 SignalsEverywhere
Monochrome TV Transmission  |Communication systems |class 12 physics subject notes|CBSE|IITJEE|NEET
Monochrome TV transmission-Communication systems Top most best online video lectures preparations notes for class 12 physics|CBSE|IIT-JEE|NEET exam|+2/12thstd standard intermediate PUC college exams preparations tips and tricks all questions with solutions cbse|ncert|cisce|nios|ICSE|wbsc|WBBSE|IB|bse|igcse|icsce|aisse|hslc|aicte|mpbse|isc|sslc|jkbose|jksbse|cce|hbse|matric|GSHSEB|isc|state board|scert|nenbse|seba|cgbse|samacheer online school videos and lectures Monochrome TV transmission-Communication systems Television or TV is a telecommunication medium used for transmitting moving images in monochrome (black-and-white), or in color, and in two or three dimensions and sound. It can refer to a television set, a television program ("TV show"), or the medium of television transmission. Monochrome TV Transmitter, Electronics and Communications,Monochrome tv transmission Read Or Refer study Material,Images for monochrome tv transmission, Television,Basics of Television Engineering,Monochrome tv,Television Engineering and Video Systems,Black and White TV, block diagram of tv transmitter, monochrome tv receiver block diagram,monochrome tv transmitter working,color tv transmitter block diagram,Functional block diagram of a monochrome television transmitter,Working Of Monochrome TV Transmitter, Monochrome T.V ,Lecture on TV Transmitter,Television Transmitter. Higher secondary school +2 12thstd standard Andhra Pradesh (Secondary Intermediate) –inter college or junior college 2nd year Bihar (School Intermediate)-PUC 2 nd year HSE Meghalaya Mizoram Nagaland Odisha Assam Kerala Madhya Pradesh Maharashtra Manipur (Secondary Higher Secondary) Council for the Indian School Certificate Examinations the Central Board for Secondary Education the National Institute of Open Schooling Pre-primary Primary Middle/ upper-primary Senior secondary inter college Board of Secondary Education CBSE Class 12 Physics , CBSE class 12 , Class +2 Physics,AIIMS,CMC-Vellore ,CMC-Ludhiana,COMED-K,JIPMER,Manipal (MBBS),MGIMS-Wardha,AMU (MBBS),BHU Medical,BITSAT ,COMED-K,IPU-CET (B.Tech),Manipal (B. Tech),VITEEE,AMU (B. Tech),NDA Entrance with PCM (MPC),All India Engineering Entrance Exam with PCM (MPC).State Level Engineering Entrance Exams,intermediate physics,|neetexam,Joint Entrance Examination (JEE) Main/Advanced,,AIPMT,AIPVT,Indian Maritime University Common Entrance Test,Indian Navy B.Tech Entry Scheme.NEST / NDA / RIE CEE Integrated B Ed / GGS IP University CET / CU CET / BHU UET / HSEE / TISS BAT / Symbiosis University SET , Delhi University B El Ed Entrance CEE , UPSEE ,RIE CEE |JEE Mains / JEE Advanced / BITSAT / VITEEE / MH CET / Architecture B Arch JEE / NATA / BArch JamiaMliaIslamia / IISER / Chennai Mathematical Institute / Statistics Entrance Exams/ NDRI Karnal / NIFTEM, NEET / AIIMS MBBS / CET for admission at SVNIRTAR and NIOH / IPH |Hotel Management / Culinary Arts Entrance Exams NCHMCT / E CHAT / PUTHAT / Indian Culinary Institute Tirupati |Law Entrance Exams CLAT / AILET / LSAT India / Punjab University Law Entrance Test| Design Entrance Exams / NIFT / NID | Kurukshetra / UCEED / CEPT / SUPVA Rohtak / MITID DAT / Pearl Academy Admission / College of Art, Delhi University / Apeejay Institute of Design / FDDI Noida |Entrance Chartered Accountancy Entrance Exam / CPT Management Entrance Tests IPM IIM Indore / Delhi University BMS BBE BFIA entrance JAT ISRO Officer Recruitment Preparation |State Bank Of India SO Jobs | Staff selection Commission (SSC) |SSC Upper Division Clerk Exam |Union Public Service Commission-UPSC Online Video Lectures tamilnadu -tnpsc group 1| tnpsc group 2 tnpsc group 4 Andhra Pradesh -APPSC group 1 | APPSC group 2 | APPSC group 4 Arunachal Pradesh PSC group 1 | PSC group 2 | PSC group 4 Bihar -BSSC group 1 | BSSC group 2 |BSSC group 4 Gujarat -GPSC group 1 | GPSC group 2 | GPSC group 4 Jammu & Kashmir -JKPSC group 1 | JKPSC group 2 | JKPSC group 4 Jharkhand -JSSC group 1 | JSSC group 2 | JSSC group 4 Madhya Pradesh -MPPSC group 1 | MPPSC group 2 | MPPSC group 4 Maharashtra -MPSC group 1 | MPSC group 2 | MPSC group 4 Odisha -OPSC group 1 | OPSC group 2 | OPSC group 4 Punjab -PPSC group 1 | PPSC group 2 | PPSC group 4 Uttar Pradesh -UPPSC group 1 | UPPSC group 2 | UPPSC group 4 West Bengal -WBSSC group 1 | WBSSC group 2 | WBSSC group 4 Karnataka -KPSC group 1 | group 2 | group 4 Kerala PSC group 1 | group 2 | group 4 Rajasthan -RPSC group 1 | RPSC group 2 | RPSC group 4 public service commission exam For more details visit: http://www.wikitechy.com/ Facebook: https://www.facebook.com/wikitechy Twitter: https://twitter.com/WikitechyCom Google Plus: https://plus.google.com/u/0/b/1089399... Linked in : https://www.linkedin.com/company/wiki... Pinterest: https://www.pinterest.com/wikitechy/ Tumblr: http://wikitechy.tumblr.com/
Views: 6155 Wikitechy School
Easy T.V. and Stereo Jammer!
Jam T.V. and stereo broadcasts within a short range. End the rampage of a noisy neighbor. Great practical joke, and magic trick. Endless laughs.
Views: 439812 stancurtin
Transmission Lines - Signal Transmission and Reflection
Visualization of the voltages and currents for electrical signals along a transmission line. My Patreon page is at https://www.patreon.com/EugeneK
1977 Alien Broadcast LIVE on BBC
Col. Donald Ware, U.S. Air Force (ret.) passes on this reminder of the time 27 years ago when the Star Visitors took over a British television program and broadcasted instead an important message for the people of Earth. [The transmission] occurred on 26 Nov 77 at 5:12 p.m. when a strange unknown voice overrode, took over, or super-modulated the TV signals from five transmitters that were monitored by the Independent Broadcasting Authority (IBA) in England. IBA did not detect the intrusion. The 5+1/2-minute message overrode a scheduled newscast read by Ivor Mills on Southern ITV, England, and was heard by listeners as far away as Andover, London, Newbury, Oxford, Reading, Southhampton, and Winchester. IBA engineers at Croydon, Surry did not hear the override, and at the main transmitter at Southhampton, Hants monitoring system, there was also no evidence of the takeover. A police spokesman told AP and UPI that the message was taken seriously: "They were frightened and generally scared." The voice spoke slowly and deliberately, with a strange inward authority, calm, serene, never scolding. It said: This is the voice of Gramaha, the Representative of the Asta (Ashtar in some texts) Galactic Command speaking to you. For many years now you have seen us as lights in the skies. We speak to you now in peace and wisdom as we have done to your brothers and sisters all over this, your planet earth. We come to warn you of the destiny of your race and your worlds so that you may communicate to your fellow beings the course you must take to avoid the disasters which threaten your worlds and the beings on our worlds around you. This is in order that you may share in the great awakening, as the planet passes into the New Age of Aquarius. The new age can be a time of great peace and evolution for your race, but only if your rulers are made aware of the evil forces that can overshadow their judgments. Be still now and listen, for your chance may not come again. For many years your scientists, governments and generals have not heeded our warnings; they have continued to experiment with the evil forces of what you call nuclear energy. Atomic bombs can destroy the earth and the beings of your sister worlds, in a moment. The wastes from atomic power systems will poison your planet for many thousands of your years to come. We, who have followed the path of evolution for far longer than you, have long since realized this -- that atomic energy is always directed against life. It has no peaceful application. Its use, and research into its use, must be ceased at once, or you all risk destruction. All weapons of evil must be removed. The time of conflict is now past and the race of which you are a part may proceed to the highest planes of evolution if you show yourselves worthy to do this. You have but a short time to learn to live together in peace and goodwill. Small groups all over the planet are learning this, and exist to pass on the light of the dawning new age to you all. You are free to accept or reject their teachings, but only those who learn to live in peace will pass to the higher realms of spiritual evolution. Hear now the voice of Gramaha, the representative of the Asta (Ashtar in some texts) Galactic Command speaking to you. Be aware also that there are many false prophets and guides operating on your world. They will suck your energy from you -- the energy you call money and will put it to evil ends giving you worthless dross in return. Your inner divine self will protect you from this. You must learn to be sensitive to the voice within, that can tell you what is truth, and what is confusion, chaos and untruth. Learn to listen to the voice of truth which is within you, and you will lead yourselves on to the path of evolution. This is our message to you our dear friends. We have watched you growing for many years as you too have watched our lights in your skies. You know that we are here, and that there are more beings on and around your earth than your scientists admit. We are deeply concerned about you and your path towards the light, and will do all we can to help you. Have no fears, seek only to know yourselves and live in harmony with the ways of your planet earth. We of the Asta Galactic Command thank you for your attention. We are now leaving the planes of your existence. May you be blessed by the supreme love and truth of the Cosmos. Southern Television broadcast interruption - Wikipedia Read more: http://en.wikipedia.org/wiki/Southern_Television_broadcast_interruption http://en.wikipedia.org/wiki/Southern...
Views: 308275 Collective Revolution
Curtis Video Sender
This is something I used back in the 1980's. It transmitted on Channel 15 or 16 UHF. So I would have a big pair of rabbit ears on the TV in my bedroom and would watch the Pay tv channels upstairs. ""A video sender (also known as a DigiSender, wireless video sender, AV sender or audio-video sender) is a device for transmitting domestic audio and video signals wirelessly from one location to another. It is most commonly used for sending the output of a source device, such as a satellite television decoder, to a television in another part of a property and provides an alternative to cable installations. A wide range of video sender technologies exist, including analogue wireless (radio), digital wireless (spread-spectrum, Wi-Fi, ultra-wideband) and digital wired (power-line communication). Other, less common, technologies also exist, such as those that use existing Ethernet networks. A typical video sender kit containing a transmitter, receiver, magic eye and a remote control to select the input. Video senders have been a frequent cause of RF interference, particularly with car key fobs." https://en.wikipedia.org/wiki/Video_sender Typical video sender applications include the transmission of television audio and video signals from a lounge to a bedroom or from a CCTV camera to a display, as well as interconnecting appliances with audio, video and IP (Internet Protocol) requirements. Most video sender systems will consist of three separate components, a transmitter, a receiver and a remote control relay (also known as a magic eye or IR blaster). The transmitter is responsible for transmitting or broadcasting a connected audio-video device, while the receiver outputs that transmitted audio-video signal to a connected television. The remote control relay permits infrared remote controls to operate the equipment whose output is being transmitted. As connectivity standards have changed in the television and audio-video markets, so it has in the video sender market, with older models usually featuring SCART and/or composite video and newer models featuring HDMI as their key means of connection to host equipment. Analogue video senders have the advantage of low manufacturing costs as the audio and video signals are simply modulated onto a carrier at 2.4 GHz or 5.8 GHz. They do, however, have the adverse effect of causing reduced bandwidth to local Wi-Fi networks and, in some cases, Wi-Fi networks can cause picture interference on the video sender signal. More information can be found in the article on electromagnetic interference at 2.4 GHz. To avoid this, some video senders now use a spread-spectrum technology and can co-exist with wireless networks and share available bandwidth. Usually there are four FM transmit channels, A, B, C & D, with stereo audio on 6.0 MHz and 6.5 MHz FM subcarriers added to the composite video baseband. These different channels can often be used to overcome the adverse effects of nearby WiFi networks. The reverse remote control channel is usually fixed at 433.92 MHz, using whatever modulation is on the 34 kHz to 45 kHz IR remote "carrier". ASK/OOK schemes such as RC5 and RC6 work best over the RF link as the receiver uses a data slicer and AGC designed for ASK/OOK with Manchester encoding. Analogue wireless video senders can achieve typical operating distances of up to 60 metres (clear line of sight) with DVD quality (720x576) video resolution and stereo audio." "Digital video senders are quickly becoming the most popular solution and combine the use of a system on chip (used for audio and video encoding/decoding) with a means of transmitting the signal, such as spread-spectrum, Wi-Fi and ultra-wideband. Early digital video sender models typically transmitted in DVD quality, but more recent models are capable of achieving 720p and 1080p high-definition resolutions. Rear views of a spread-spectrum transmitter and receiver. Spread-spectrum Spread-spectrum techniques are methods by which a signal is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. Within the video sender market, these techniques allow for a wireless signal to be transmitted with much less chance of interference from, and to, local Wi-Fi networks. It is not uncommon for several Wi-Fi networks to be within range of a typical home and as such, spread-spectrum based video senders are often the best solution for transmitting audio and video signals within this crowded wireless environment." Wikipedia How to set up a free satellite set-up and what you will need https://www.youtube.com/watch?v=SNdmPUcPKL4 For a Big Cband dish https://www.youtube.com/watch?v=dD4W2f-Geyg Check out more videos at https://www.youtube.com/user/ottawaoctane/videos https://www.facebook.com/RobbieStrikeVideos/ https://twitter.com/robbiestrike3 (c) Robbie Strike 2018 http://www.RobbieStrike.com
Views: 1388 ottawaoctane
Tesla vs. Marconi: Who Invented Radio - Decades TV Network
Nikola Tesla gave a public demonstration of the wireless transmission of energy on March 1, 1893. He had created an induction coil to transmit and receive radio signals. Years later while he was preparing to transmit signals at a distance, so was another inventor: Guglielmo Marconi. Marconi transmitted the first transatlantic telegraph but Tesla had secured two radio patents in America. It became a story of fierce competition between two brilliant minds and a debate over who invented radio.
Views: 19164 Decades TV Network
Tomorrow's World - Computer program transmitted over TV
This clip is from Tomorrow's World (6.55pm on 3rd December 1981). Presenters Kieran Prendeville and Su Ingle demonstrate how computer programs are save on cassette tape, with a plug for the new BBC Micro. They then transmit a program for the Apple II and ZX81 but the program does not work on the show. The following week Su showed the program running and people wrote in to say that it had worked. A piece in the Radio Times explained how to record the program, see http://postimg.org/image/s7pgs77i5/. For a clip of the programs running (on emulators) visit https://youtu.be/SWvvZnIOVaU.
Views: 21311 LarryDors
AT&T Archives: Television and The Telephone, a 1946 film about microwave broadcasting
See more from the AT&T Archives at http://techchannel.att.com/archives The content for this 1946 film was taken from a radio broadcast of the Bell Telephone Hour. This film provides a short explanation of how the national broadcast network formed a backbone built by the Bell System to not only handle radio syndication, but also television broadcast signals, and long-distance telephone calls. The network was made up of a series of line-of-sight microwave towers combined with coaxial cable. The film explains the new technologies that reduced the size and number of wires and cables, replacing them with microwave systems and relays. By 1947, the Bell System's microwave broadcast corridor handled television signals between New York and Boston. Western Union had a competing microwave line between Pittsburgh and Washington D.C.; General Electric transmitted between New York City and Schenectady; and Philco broadcast along the New York City to Philadelphia corridor. But while these other companies carried television signals, the Bell network carried both television and telephone signals. Even something called "radio mail" was proposed--a high-speed fax service for missives and photos to be transmitted via the microwave network. By 1952, $40 million had been spent on the combined microwave and coaxial coast-to-coast network by the Bell System, which employed 107 towers coast-to-coast to carry telephone and television signals. The 1952 political conventions were the first to be broadcast nationwide, using this network, which included 46 cities. Footage Courtesy of AT&T Archives and History Center, Warren, NJ
Views: 11378 AT&T Tech Channel
Presented by RCA, one of the pioneers in television technology, this 1939 film shows the new medium being demonstrated at the World's Fair. These early iconoscope TV systems are shown at the 1:10 mark, and the receiver known as the kinescope shown. Both of these early technologies would be replaced before television arrived in American homes after WWII. Interestingly however, television was used during the war on a variety of guided weapons including the TDR-1 torpedo drone (look it up). At 2 minutes, the television antenna atop the Empire State Building is seen, capable of broadcasting TV signals to all of New York City to the line of sight. At 2:57, mobile television units are seen deploying across Manhattan to broadcast a horse race. At 5:03, studio broadcast of a concert is seen, with the iconoscope further explained, and a control room being used to direct the broadcast. The Iconoscope was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier mechanical designs, and could be used under any well-lit conditions. This was the first fully electronic system to replace earlier cameras, which used special spotlights or spinning disks to capture light from a single very brightly lit spot. Some of the principles of this apparatus were described when Vladimir Zworykin filed two patents for a Television system in 1923 and 1925. The German company Telefunken bought the rights from RCA and built the iconoscope camera used for the historical TV transmission at the 1936 Summer Olympics in Berlin. In the United States the Iconoscope was the leading camera tube used for broadcasting from 1936 until 1946, when it was replaced by the image orthicon tube. The Kinescope was the name given to the cathode ray tube that served as the receiver of the electrical image. This was the tube that decoded the transmitted electrical impulses back into an optical image that could be seen by the television viewer. This is the heart of the television set… the picture tube. Vladimir Kosmich Zworykin (July 29, 1888 – July 29, 1982)was a Russian inventor, engineer, and pioneer of television technology. Educated in Russia and in France, he spent most of his life in the United States. Zworykin invented a television transmitting and receiving system employing cathode ray tubes. He played a role in the practical development of television from the early thirties, including charge storage-type tubes, infrared image tubes and the electron microscope. We encourage viewers to add comments and, especially, to provide additional information about our videos by adding a comment! See something interesting? Tell people what it is and what they can see by writing something for example like: "01:00:12:00 -- President Roosevelt is seen meeting with Winston Churchill at the Quebec Conference." This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2k. For more information visit http://www.PeriscopeFilm.com
Views: 5177 PeriscopeFilm
What Is A Broadcast Antenna?
Its cord cutting guide helps you evaluate alternatives to cable or satellite subscriptions in radio an antenna is the interface between waves propagating through space and thus loop built into most am broadcast (medium wave) receivers has a very narrow bandwidth, but tuned using parallel capacitance broadcasting stuttgart. Antenna selection guide channel mastertv transmitter locator and mapping tool. You the distance coverage between your location and broadcast towers oct 22, 2014 all digital antennas receive same picture sound quality; We just give them a familiar name. Tv for free simply by plugging in an over the air (ota) hdtv antenna. Find your nearest digital tv transmitter with antennas direct's mapping tool. Want to jun 9, 2012 in spite of the advent new 'digital' broadcast tv antennas on market, none them are able hold a candle pull power apr 30, 2014 luckily, all i needed was good over air antenna plug my. Some broadcasts will be in full hd while others are broadcast standard definition. Googleusercontent search. Antenna selection guide channel master antennas direct. The real difference is the uncompressed signal received with an antenna. How to choose the best over air antenna for free hdtv. There are channels, and then there sub channels a signal amplifier is used in cases where one of your broadcast towers located at significantly further distance than the others, or you having trouble getting reliable reception from two due to foliage, mountain range, splitting signals inside home between more television sets use antennaweb explore viewing options. Html url? Q webcache. Future of nyc broadcast tv moving to 1 wtc the bridge. Used when calculating service and interference contours for licensed broadcast television stations discover what hdtv channels are broadcasting over the air in your area. First tv broadcast antennas go up at one world trade center. Broadcasting is the distribution of audio or video content other messages to a dispersed broadcast transmitter refers an installation used for broadcasting, including radio television equipment, antenna, and often tv aerial, antenna specifically designed reception over air signals, which are transmitted at tower locator will find angle range, compile ground elevation image, look terrain masking based on msl nocable plots all 1812 digital antennas that broadcasting free signalswe help you choose best watching 12 channels near atlanta, ga 30345distance from 7 miles. If you have a cable subscription may think tv antennas are relic of the past, but did know broadcast stations (cbs, abc, pbs, nbc, fox) continue to for more information on antennas, see antenna guide. The 7 best tv antennas to buy in 2017 lifewirefederal communications commissionover the air (ota) dvr free digital broadcast television reception a how guide 6 steps. Tv antenna selection guide channel masterantenna (radio) wikipediabroadcast transmitter wikipediatv broadcast tower locator (ota dtv)atlanta, ga tv channels &
Views: 40 Your Question I
What Is The Television?
Dictionary and word of the day drama three years after disappearance 2. The leftovers (tv series 2014 ) imdb. Learn more a television is an electrical device used for entertainment, learning and work. Television definition of television by the free dictionary. Meaning, pronunciation, translations and examples television definition, the transmission of programming, in form still or moving images, via radio waves, cable wires, satellite, wireless network to a nov 26, 2007 after an annus horribilis, peter fincham asks his peers big question facing industry meaning, what is device shaped like box with screen that receives electrical signals changes. Digital television can be either standard or high definition. Digital television is not the same thing as hdtv (high definition television). An electronic system of transmitting transient images fixed or moving objects together with sound over a wire through space by apparatus that converts light and into electrical waves reconverts them visible rays audible television definition set is piece equipment consisting box. History of television mitchell stephens nyu. What is television history of television, systemsthesaurus. Breaking into television writing the writers store. A television can be used to watch the evening news, play a game and much definition of system for converting visual images (with sound) into electrical signals, transmitting them by radio or other means, display. Two words you'll see a lot of in this fall's television season, sometimes tandem marvel and netflix. Television (often abbreviated to tv or idiot box in british english is a widely used telecommunication system for broadcasting and receiving moving synonyms television at thesaurus with free online thesaurus, antonyms, definitions. Television (dtv)? Definition from whatis. Basics of cloud based television. The new season of television listings for the fall academy. Television wikipediadefinition of television by merriam webstercollins english dictionarydefine at dictionary media meaning in the cambridge dictionaryreference definition oxford dictionaries. Learn more about gaining access to your favorite tv shows and movies with electronic television was first successfully demonstrated in san francisco on septthe system designed by philo taylor farnsworth, a 21 year old writing for is demystified this expert blog lee goldberg who discusses the ins outs of. An electronic broadcast system in which special providers transmit a continuous program of video content to the public or subscribers by way antenna, digital television (dtv) is transmission signals using rather than conventional analog methods. Television critics association the tca welcomes youwhat is cloud tv. Television wikipedia television (tv) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or color, two three dimensions sound. During the 1950s, television was primary medium for influencing public opinion a program (brit
Views: 9 Your Question I
Satellite Communication - Defintion, Principle, Polar Circular orbit
Satellite Communication Satellite communication is the branch of telecommunication which establishes and communication using satellites across the globe.We can divide the whole satellite communication into two parts namely space segments and earth segments.Satellite communication uses highly sophisticated and secured communication methods and algorithms.In satellite communication we use microwave frequencies ranging from 1GHz to 40 GHz which is further divided into various bands.In satellite communication we use multiplexing techniques such as FDMA,TDMA,CDMA etc which enables the bandwidth utilization.In the process of design we have to consider many parameters such as path loss,propagation loss,noise factors,atmospheric loss etc. Checkout for more information: https://www.tutorvista.com/content/physics/physics-ii/space-exploration/communication-satellites.php Follow us at: https://www.facebook.com/tutorvista https://twitter.com/TutorVista
Views: 348174 TutorVista
Early TV: "Television" (1939) RCA Radio Corporation of America
This video is about Early TV really interesting watch. https://en.wikipedia.org/wiki/Television Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound. The term can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium for advertising, entertainment and news. Television became available in crude experimental forms in the late 1920s, but it would still be several years before the new technology would be marketed to consumers. After World War II, an improved form of black-and-white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses, and institutions. During the 1950s, television was the primary medium for influencing public opinion.[1] In the mid-1960s, color broadcasting was introduced in the US and most other developed countries. The availability of multiple types of archival storage media such as Betamax, VHS tape, local disks, DVDs, flash drives, high-definition Blu-ray Discs, and cloud digital video recorders have enabled viewers to watch pre-recorded material—such as movies— at home on their own time schedule. For many reasons, especially the convenience of remote retrieval, the storage of television and video programming now occurs on the cloud. At the end of the first decade of the 2000s, digital television transmissions greatly increased in popularity. Another development was the move from standard-definition television (SDTV) (576i, with 576 interlaced lines of resolution and 480i) to high-definition television (HDTV), which provides a resolution that is substantially higher. HDTV may be transmitted in various formats: 1080p, 1080i and 720p. Since 2010, with the invention of smart television, Internet television has increased the availability of television programs and movies via the Internet through streaming video services such as Netflix, Amazon Video, iPlayer, Hulu, Roku and Chromecast. In 2013, 79% of the world's households owned a television set.[2] The replacement of early bulky, high-voltage cathode ray tube (CRT) screen displays with compact, energy-efficient, flat-panel alternative technologies such as LCDs (both fluorescent-backlit and LED), OLED displays, and plasma displays was a hardware revolution that began with computer monitors in the late 1990s. Most TV sets sold in the 2000s were flat-panel, mainly LEDs. Major manufacturers announced the discontinuation of CRT, DLP, plasma, and even fluorescent-backlit LCDs by the mid-2010s.[3][4][5] In the near future, LEDs are expected to be gradually replaced by OLEDs.[6] Also, major manufacturers have announced that they will increasingly produce smart TVs in the mid-2010s.[7][8][9] Smart TVs with integrated Internet and Web 2.0 functions became the dominant form of television by the late 2010s.[10] Television signals were initially distributed only as terrestrial television using high-powered radio-frequency transmitters to broadcast the signal to individual television receivers. Alternatively television signals are distributed by coaxial cable or optical fiber, satellite systems and, since the 2000s via the Internet. Until the early 2000s, these were transmitted as analog signals, but a transition to digital television is expected to be completed worldwide by the late 2010s. A standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals. A visual display device which lacks a tuner is correctly called a video monitor rather than a television.
Views: 13 Old Movies Reborn
Wireless Data Transmission by KitsGuru.com | LGKT080
In the kit Wireless Data Transmission (Bit Transmission - http://www.kitsguru.com/mini-projects/communication-projects/wireless-data-transmission) we will design a system to transmit digital sequence of 4- bit to the remote location and represents the signal 4 bit at receiver end. The kit Wireless Data Transmission (Bit Transmission) demonstrates the basic concept of wireless digital data transmission. There are two different sections one is the transmitter and other is receiver section. In transmitter section consists of the 4-bit dip switch (representing four bit data).The switches are used in active low mode. The data bits are parallel but for transmitting the data should be serial therefore HT12E encoder is used which has 4 data lines and 8 address lines. It encodes the parallel data into serial data which transmitted over 434 MHz RF-channel using RF transmitter. Next The RF receiver receives the digital data serially on same carrier frequency and the decoder HT12D decodes the serial data give the same data bit as on transmitter which is indicated in the form of LED indications as the digital data bits.
Views: 9174 KitsGuru
Watch this one video and never forget what Space Wave Propagation is
Watch this one video and never forget what Space Wave Propagation is. JEE Physics XII Communication System Space Wave Propagation The space waves are the radio waves of very high frequency (30 MHz to 300 MHz) ultra high frequency (300 MHz to 3000 MHz) and microwave (more than 3000 MHz). At such high frequencies, the sky wave as well as ground wave propagation both fails. These waves can be transmitted from transmitting to receiving antenna either directly or after reflection from the ground or in troposphere, the wave propagation is called space wave propagation. The space wave propagation is also called as line of sight propagation. The line of sight distance is the distance between transmitting antenna and receiving antenna at which they can see each other. Space wave propagation can be utilised for transmitting high frequency TV and FM signals. (1) Television signal propagation : Frequency range for propagation is 80 MHz to 200 MHz Height of transmitting antenna : (d = distance covered by the signal, R = Radius of the Earth) Area covered : A = d2 = 2Rh Population cover : Population density  Area covered (2) Microwave communication : Microwave communication systems are used for long distance communication. Since at microwave frequencies, electromagnetic waves cannot bend across the obstacles, such as the top of the buildings, mountains etc., it is therefore necessary that microwave transmission is in line-of-sight. Due to curvature in the surface of earth, the range of microwave transmission is very small ( 50 km). The range of microwave transmission is also limited by the fact that signals gets weaker and weaker as it propagates. However, these problems are overcome by using repeaters (A repeater is basically an amplifier, which amplifies the attenuated signal and then retransmits it.) at intervals between the transmitter and the receiver. Due to this, the cost of transmission of signal between the two stations increases. The problems faced in a microwave communication system are solved to a large extent by using a geostationary satellite as a communication satellite. For more such resources go to https://goo.gl/Eh96EY Website:https://www.learnpedia.in/
Views: 18728 Learnpedia
Mobile Spectrum Analyzer + Digital TV - Software Defined Radio Series #30
In this video I show how to use your mobile phone as a spectrum analyzer by connecting an RTL-SDR to it with an OTG (On-The-Go) cable. Installing the apps including drivers is straight forward and doesn't require a guide, as it's like installing any other Android app. For reception of Digital TV (DVB-T), the antenna should as instructed in the video, be placed outside for optimal signal quality. The spectrum analyzer application should be able to even record signals as well, so if for example the ISS passes overhead and is transmitting, then you could pick up the International Space Station too, or several other interesting satellites too. Special Thanks: - Josh (First elite supporter!) Tools: - RTL-SDR (R820T2) - ANT500 (Antenna) - OTG (On-The-Go) Cable - Samsung Galaxy S6 (Almost any fairly recent Android-based smartphone should work.) Apps: - Touch SDR (https://play.google.com/store/apps/details?id=marto.androsdr2) - Aerial TV - DVB-T Receiver (https://play.google.com/store/apps/details?id=info.martinmarinov.aerialtv) - RTL2832U Driver (https://play.google.com/store/apps/details?id=marto.rtl_tcp_andro) - DVB-T Driver (https://play.google.com/store/apps/details?id=info.martinmarinov.dvbdriver) Stay tuned and subscribe for upcoming video about various types of hacks! Twitter: @CrazyDaneHacker Facebook: https://www.facebook.com/crazydanishhacker Patreon: https://www.patreon.com/crazydanishhacker Website: https://www.crazydanishhacker.com/
Views: 2476 Crazy Danish Hacker
Black-and-white television Meaning
Video shows what black-and-white television means. A monochrome system of transmitting and receiving television signals.. A television set that displays only monochrome images.. Black-and-white television Meaning. How to pronounce, definition audio dictionary. How to say black-and-white television. Powered by MaryTTS, Wiktionary
Views: 30 ADictionary