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How Television broadcast works
 
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How Television broadcast works
Views: 163165 Daniel Izzo
DIY: Build Your Own Television Broadcaster
 
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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: 74294 georgef551
How is digital TV different from analog?
 
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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: 99096 IowaPublicTelevision
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: 561620 weBoost
How Radio Waves Are Produced
 
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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: 729930 AtomModel
Broadcasting Analog TV on an ESP8266!
 
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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: 144977 CNLohr
Wireless Video Transmission Broadcast Guide - Part 1
 
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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
Turn your old VHS video player into a TV transmitter.
 
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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: 57341 dazaro3
Satellite Communication
 
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Follow us at: https://plus.google.com/+tutorvista/ Check out us at:http://www.tutorvista.com/content/physics/physics-ii/space-exploration/communication-satellites.php 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. Please like our facebook page http://www.facebook.com/tutorvista
Views: 327816 TutorVista
How To Make A Tv Antenna Work Better
 
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Im taking the best of 2 tv antennas and combining them together to make the antenna pick up better on VHF and UHF. After broadcasters made the switch from analog to digital back in 2009, finding a signal became a little trickier. That’s because with a digital signal you either get a clear picture or no picture at all. For those who aren’t allowed or are unable to install an outdoor antenna on their roof, that means putting the antenna in just the right spot is more critical than ever. Even the newer, more advanced “flat” antennas that are multi-directional and don’t have to be “pointed” at a precise angle, like the highly-rated, For cord cutters, everything old is new again — at least when it comes to using an antenna to pick up free, over-the-air (OTA) TV. As a growing number of people become tired of the rising costs of cable TV and all of the other hassles that come with it, many are cutting the cable in favor of streaming TV and OTA TV. Unsurprisingly, antenna sales have increased in recent years, with retailers like Antennas Direct reporting huge spikes . If there’s one drawback to dusting off the old bunny ears, however, it’s that setting up your indoor antenna properly to pick up all of the stations in your area in crystal-clear HD can be challenging. After broadcasters made the switch from analog to digital back in 2009, finding a signal became a little trickier. That’s because with a digital signal you either get a clear picture or no picture at all. For those who aren’t allowed or are unable to install an outdoor antenna on their roof, that means putting the antenna in just the right spot is more critical than ever. Even the newer, more advanced “flat” antennas that are multi-directional and don’t have to be “pointed” at a precise angle, like the highly-rated, popular Mohu Leaf, can still require a little work to get positioned just right to pick up the best signal possible. Thankfully, there are some simple tips and tricks that will help you get optimal reception with your indoor antenna. Find Out Where The Broadcast Towers Are In Your Area TV tower Aiming your antenna at TV transmission towers can improve reception. Photo by woodleywonderworks and used here. The first thing you need to do before even attempting to set up your antenna is to identify the locations of the broadcast towers in your area. Ideally, you’ll do this before you even buy your antenna because this will help you better understand how powerful the antenna will need to be to pick up the stations you want to watch.The fewer obstructions between your antenna and the broadcast towers, the better. And make no mistake–thick walls and ceilings are certainly obstructions. That’s why placing your antenna in or near a window often yields the best results. Many times, this can give you the clearest line of sight to the broadcast tower, provided there isn’t a major obstruction right outside of the window, such as a big tree or your neighbor’s brick wall. ne of the things you’ll notice when you use the signal finder tools on TV Fool, AntennaWeb, or other similar sites is that you’ll be asked to input the estimated height of your antenna. There’s a very important reason for this. Typically, the higher your antenna is placed, the better your reception will be. That’s why outdoor antennas tend to pick up so many channels. With that in mind, you should try to place your antenna as high as you can in your room (keeping in mind that you still want it near an outside-facing wall and by a window, if possible). In some cases, such as when the TV is down in a basement or broadcast towers are far away, this may mean placing the antenna up on a higher story or even in the attic, and it may require a slightly longer coaxial cable. Just make sure that you don’t get an unnecessarily long coax cable because long cable runs can degrade the signal. Keep The Antenna Away From Any Metal Metallic surfaces near your antenna can cause interference with the digital signals and block your reception. For example, if you place your antenna in a window but there are metal burglar bars or a metal bug screen just outside the window, this could cause issues. Likewise, if you have a metal roof in your home, installing your antenna in the middle of the attic probably won’t yield positive results.
Views: 51891 Danny S Hodges
Easy T.V. and Stereo Jammer!
 
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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: 433613 stancurtin
TV Transmitter
 
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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: 23716 Paulo Ramos
How to Install a Wireless TV Satellite & Cable Audio Video Transmitter to Save Money
 
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Purchase transmitter on Amazon at http://amzn.to/IrsWMw. Visit http://drlalford.ecrater.com for training or a consultation.
Views: 139927 Tish Alford
Lecture - 26 TV Transmission
 
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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: 55122 nptelhrd
Transmitting NTSC/ATSC Video With the HackRF One and Gnuradio
 
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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://127.0.0.1:9999 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: 3485 Vladislav Fomitchev
How to connect TV wireless to HD cablebox / bluray from another room
 
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How to connect TV to HD cablebox and bluray wirelessly from another room, watch tv wireless from other rooms in your house. it mirrors cablebox or dvd player then transmits to receiver in another room up to 150ft! For more info see here- http://tampatec.blogspot.com/2015/02/how-to-connect-tv-to-hd-cablebox-and.html
Views: 47612 Tampatec
How to Watch HD Cable TV WIRELESS on MULTI TVs, works for PS3, PS4 & XBOX
 
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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: 427862 Tampatec
Alien Voice hijacks live TV broadcast
 
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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: 330460 creepypaste
Introduction of Analog and Digital Transmission
 
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This video shows introduction of Analog and Digital Transmission in Computer Network using Example
Views: 30901 Techno Bandhu
How To Connect 2 TV Wireless
 
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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: 109037 Danny S Hodges
BANDWIDTH OF SIGNAL
 
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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: 118410 7activestudio
Holy smoke Jeanne Moos reports unclarities in transmitting tv signals
 
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Seagull researches messaging and meditates about a truly European bird certificate for the safe application of sustainable technology.
Views: 383 Bert Kerkhof
Radio - broadcasting and reception - Science
 
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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: 13197 Elearnin
Where is your Antenna? Transmitters, Receivers, Radio, TV
 
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Namaskaar Dosto, is video mein maine aapko Antennas ke baare mein baat ki hai, aap sabhi ne tareh tareh ke antennas dekhe honge, yeh Transmitters ho sakte hai Receivers ho sakte hai, aur Transreceivers bhi ho sakte hai, aise mein TV tower ho ya Mobile Tower, Cellphone ho ya Radio sabhi mein aapko Antennas dekhne ko milte hai. Maine aapko bataya hai ki alag alag types ke antennas kaise hote hai aur inke piche ki science kya hai? Mujhe umeed hai ki aapko antennas ke baare mein yeh video pasand aayegi. Share, Support, Subscribe!!! Subscribe: http://bit.ly/1Wfsvt4 Youtube: http://www.youtube.com/c/TechnicalGuruji Twitter: http://www.twitter.com/technicalguruji Facebook: http://www.facebook.com/technicalguruji Instagram: http://instagram.com/technicalguruji Google Plus: https://plus.google.com/+TechnicalGuruji About : Technical Guruji is a YouTube Channel, where you will find technological videos in Hindi, New Video is Posted Everyday :)
Views: 133545 Technical Guruji
Using IR Signals to Control TV
 
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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: 11817 Grensom
Lecture -7 Transmission of Digital Signal - I
 
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Lecture Series on Data Communication by Prof.A. Pal, Department of Computer Science Engineering,IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 162389 nptelhrd
Transmission Lines - Signal Transmission and Reflection
 
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Visualization of the voltages and currents for electrical signals along a transmission line. My Patreon page is at https://www.patreon.com/EugeneK
How Does A Television Broadcast Work?
 
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How television broadcasting works the tech faq. 29 may 2017 tv transmitters. Many countries are now switching over to digital television, which works in a similar way radio india, there two types of broadcast networks terrestrial and c&s (cable & satellite). Currently, terrestrial network is only available for state owned doordarshan transmitting signals across the nation. Now in digital television (dtv), there are four main systems 9 aug 2017 what networks not. These are basically a 'share' of the subscription fee you pay to your cable or satellite operator that is then shared back content owner distributor (typically on per web each student creates and maintains their own website which also serves as digital portfolio house all work created while attending program. Anyone using a television set that has receiver and an antenna can pick them up for free. As per current estimates, still 30 40mn the composite tv signal described in previous sections can be broadcast to your house on any available channel. The food network and the game show are two examples. In cable television, some channels use the word 'network' in their name even though they are a single channel and do not meet definition of network. Each set of 30 apr 2010 for those who do not know, affiliate fees are the primary revenue stream that funds today's mainstream television content development. From a broadcast journalist role, you could move into programme production or management roles, become journalists, newspaper reporters writers the price that consumer pays each month for video service is driven largely by costs tv distributors like rcn must pay to companies create at same time, local stations have begun demanding significant fees carry programming they offer free over air and via internet 1973 television broadcasting jobs available on indeed. 0, to do this role, you will need to have an broadcast journalists working in television work in a variety of genres including news, current affairs, or documentaries. Anyone with a simple tv antenna can receive the channel signal. How do television programming costs work? Television broadcasting jobs, employment. How does television (tv) work? Explain that stuff. Broadcasting network definition tv and radio business. Content producer, social media coordinator, scheduling coordinator and more! How does television (tv) work? Explain that stuff. Analog versus digital tv what's the broadcasting wikipediabroadcast television systems wikipedia. Googleusercontent searchbroadcast television signals are video and sound that transmitted over the air. Television principles of television systems here's how the tv business actually works (and why it's going to radio & broadcasting program school 4k broadcasts are coming what you need know broadcast journalist creative skillset. Antennas are used to grab as much signal possible and sometimes amplify the 23 may 2011. Promotions what is the formula for creating a successful radio or television promoti
Views: 45 tell sparky
Electromagnetic Spectrum: Radio Waves
 
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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: 376294 Best0fScience
Broadcasting Digital TV w/ BladeRF - Part 2/2 - Software Defined Radio Series #22
 
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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: 3358 Crazy Danish Hacker
SDR Transmit ATSC 8VSB to Digital Television with HackRF SDR
 
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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: 1578 SignalsEverywhere
5 Strangest Radio Stations & Most Mysterious Transmissions
 
07:41
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: 787431 Top5s
Best Wireless HDMI Transmitters For 2018
 
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Get the best deals on the best wireless HDMI transmitters at: https://luckslist.com/best-wireless-hdmi-transmitters We've researched thousands of buyer reviews to find you the best wireless HDMI transmitter for 2018. Here are the wireless HDMI transmitter that we've reviewed in this video: #7: DVDO Air3C This wireless HDMI transmitter features an interference-free 60 GHz wireless signal that will not be affected by microwaves and mobile phones. It has a receiver to a DTV that powers directly from your HDTV without A/C power required. Plus, it has an auto-aiming technology for a solid connection. #6: Actiontec MyWirelessTV 2 This wireless HDMI transmitter can wirelessly connect your HDMI-enabled media devices to your HDTV to deliver multi-room support. It also delivers up to 1080p30 and 5.1 audio wirelessly with A/V auto adjustment. It is a little bit hefty but would you mind if it is easier to use? #5: IOGear Matrix GWHDMS52 This wireless HDMI transmitter is more likely has the same price as the previous model. It has It has a built-in 5x2 matrix that allows you to switch and select any 5 sources between 2 HDTVs. It is a high-priced transmitter yet a good choice for numerous HDMI-enabled devices. #4: Cable Matters Extender This wireless HDMI transmitter has an extender that can broadcast an HD audio video signal for up to 100 feet in a living room, classroom or conference room. It features 1080p at the 60Hz video, along with 2 channel stereo, 5.1, and 7.1 surround sound audio. Plus, it is interference-free with its 60 GHz frequent band that does not interfere with other wifi connection or wireless devices in the same room. #3: Optoma WHD200 Ideal for gamers and home theater-lovers, this wireless HDMI transmitter has uncompressed HD content for up to 100 ft. It can connect up to 2 HDMI sources with a remote control to switch between the devices. It functions equally well with laptops, tablets, monitors, projectors and standard HDTVs. #2: Nyrius ARIES Prime This wireless HDMI transmitter delivers a crystal clear uncompressed HD video and audio with ease. Its compact low profile design makes it perfect for laptops and HDMI-enable video devices. Plus, it has real-time zero latency even when you are streaming a 3D video to a 1080p device. #1: J-Tech Digital HDbitT Series This wireless HDMI transmitter has an extender up to 660 ft. away that puts it at the top of our list for the best wireless HDMI transmitter you can buy. This is not for real-time shooting or PC operation but ideal for home use with only 0.3-0.5 second latency time. Fortunately, it is compatible with all video formats you want. Get the best deals on the best wireless HDMI transmitters at: https://luckslist.com/best-wireless-hdmi-transmitters
Views: 85827 Lucks List
Waltham Transmitter. TV Radio. Waltham-On-The-Wolds, Leicester
 
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The Waltham transmitting station (TV and Radio broadcast tower) is located in Waltham-On-The-Wolds, Leicestershire, England. It is one of five main UHF transmitters serving the Midlands and amongst them it features the tallest transmission mast at a mighty 315 metres (1,033 ft). Transmitting on UHF between 1,400 and 50,000 watts. Broadcasting Digital terrestrial and non terrestrial television, 4G and other platforms across the East Midlands. (Note: There are some blank segments in this video, I'm not sure what's causing this) --- 08 October 2014 Watch in HD and full screen
Views: 4062 Simon Nottm
THE END OF ANALOGUE (bluebell hill transmitter)
 
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The analogue TV signals being switched off from the Bluebell hill transmitter. Also the old freeview multiplexes were turned off. In the UK the old analogue TV signasl is being turned off, so that the new freeview signals can take the best frequencies which the analogue was using, and also making room for 4G mobile networks. The freeview TV signal has been very crap around medway. (the freeview channels come in 6 different multiplexes of channels). The multiplex for the BBC channels was particularly crap, especially in the evening. Every few minuets the picture would stop from interference (with freeview it either works or it doesn't, while with analogue the picture would get more snowy, which means with a poor signal you could still watch make out analogue, but freeview would not work at all). The BBC channels kept cutting out in the evening at regular intervals which I think was due to some idiots amateur radio signal not sticking tightly to its frequency and distorting the TV signal, as well as the fact the BBCs multiplex was not at the optimum frequency as those were being hogged by analogue. A few months ago there was a switch around of the freeview multiplexes frequencies, and everyone had to retune their freeview. After this the BBCs Multiplex got better but the Multiplex for ITV and Channel 4 got a lot worse. And now, On the 13th june 2012, the BBC 2 analogue was switched off (I forgot to film this). and also there was anouther switch around of the freeview multiplexes (aka a retune). And on the 26th June 2012, I had forgotten that I wanted to film the analogue switch off, and at just one hour before midnight I remembered, and I dashed round to a relatives house to film it (as my house doesn't have an arial at the moment). And at just 30 minuets before the switch off on BBC one, to my surprise, the teletext was still being transmitted. (Ceefax Teletext is a odd system that uses the first few lines of the picture to transmit info like the news, this old analogue feature is not on digital, and I was amazed that it was still running). See my video of teletext... http://youtu.be/Xbyxi5j_22s And now it was time for the analogue switch off (at midnight on the 26th/27th), sadly there wasn't anything that happened before the switch off, it just suddenly switched off, I was a bit disappointed, there wasn't even an announcement like with londons switch off. BBC 1 analogue switched off at 0:07, ITV analogue switched off at 0:13, Channel 4 analogue switched off at 0:15, The old BBC freeview multiplex switched off before channel 4 analogue did so I couln't film it. and the ITV/Channel 4 freeview multiplex turned off later in the night but I had gone home to bed by then. In the morning the new freeview multiplexes were running. I do not know of the exact details of all of the changes with the multiplexes with all the retunes, I can't seem to find out the exact details on the internet. If you know of the movements of the multiplexes at bluebell hill please could you tell me. http://beno.org.uk
Views: 18306 Beno Lifts
1977 Alien Broadcast LIVE on BBC
 
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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: 284784 Collective Revolution
Solid VS Mesh satellite dish?
 
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THE HAPPY SATELLITE NERD EPISODE 32 What is the best a mesh Satellite dish or a solid satellite dish? With this new 8 foot mesh from TEK2000.com I have found very similar results with my old solid dish except I have found that the mesh dish does much better in the wind! History Lesson Parabolic antennas referred to as "dish" antennas had been in use long before satellite television. The term "satellite dish" was coined in 1978 during the beginning of the satellite television industry, and came to refer to dish antennas that send and/or receive signals from communications satellites. Taylor Howard of San Andreas, California adapted an ex-military dish in 1976 and became the first person to receive satellite television signals using it.[3] The first satellite television dishes were built to receive signals on the C-band analog, and were very large. The front cover of the 1979 Neiman-Marcus Christmas catalog featured the first home satellite TV stations on sale.[4] The dishes were nearly 20 feet (6.1 m) in diameter.[5] The satellite dishes of the early 1980s were 10 to 16 feet (3.0 to 4.9 m) in diameter[6] and made of fiberglass with an embedded layer of wire mesh or aluminum foil, or solid aluminum or steel.[7] Satellite dishes made of wire mesh first came out in the early 1980s, and were at first 10 feet (3.0 m) in diameter. As the front-end technology improved and the noise figure of the LNBs fell, the size shrank to 8 feet (2.4 m) a few years later, and continued to get smaller reducing to 6 feet (1.8 m) feet by the late 1980s and 4 feet (1.2 m) by the early 1990s.[8] Larger dishes continued to be used, however.[8] In December 1988 Luxembourg's Astra 1A satellite began transmitting analog television signals on the Ku band for the European market.[9] This allowed small dishes (90 cm) to be used reliably for the first time.[9] In the early 1990s, four large American cable companies founded PrimeStar, a direct broadcasting company using medium power satellites.[10] The relatively strong Ku band transmissions allowed the use of dishes as small as 90 cm for the first time.[10] On 4 March 1996 EchoStar introduced Digital Sky Highway (Dish Network).[11] This was the first widely used direct-broadcast satellite television system and allowed dishes as small as 20 cm to be used. This great decrease of dish size also allowed satellite dishes to be installed on vehicles.[12] Dishes this size are still in use today. Television stations, however, still prefer to transmit their signals on the C-band analog with large dishes due to the fact that C-band signals are less prone to rain fade than Ku band signals. Check out my other video's on what free satellite channels are out there! Cband Channels https://www.youtube.com/watch?v=5twQ3sAHDAo Ku Band Channels https://www.youtube.com/watch?v=F72Egpkq1XA 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/ http://www.dailymotion.com/robbiestrike https://www.facebook.com/East-Kentucky-Free-to-Air-Satellite-TV-and-Satellite-Communications-454215958310475/ (c) Robbie Strike 2017
Views: 3755 ottawaoctane
My First Perfect ISS SSTV Image!
 
06:45
Subscribe for more vids! https://www.youtube.com/SpaceComms1?sub_confirmation=1 With 25 watts of power coming from the radio on the ISS, the signal, transmitted on 145.800 MHz, can be received with a setup as simple as a handheld amateur radio or scanner, and a rubber duck antenna. Decoding the images can be as simple as holding the radio next to the microphone of an iOS or Android device. Ideally though, you would use a high gain or directional antenna, and an audio cable connected directly between the radio and decoding device, whether it’s a smart phone or a computer. Whatever software you use, make sure it’s set to SSTV mode PD120, as that’s what the ISS will be using, and if you don’t set that, you might not decode any images at all (see hint below). = Recommended decoding software = For iOS use “CQ SSTV” https://itunes.apple.com/app/sstv/id387910013 For Android use “Robot36” https://play.google.com/store/apps/details?id=xdsopl.robot36&hl=en For Windows use “MMSSTV” (see AMSAT UK link below for setup) http://hamsoft.ca/pages/mmsstv.php For Mac OS X use “Multiscan 3B SSTV” (not verified) http://www.qsl.net/kd6cji/ = Tracking the ISS = Howto use heavens-above.com to track the ISS https://spacecomms.wordpress.com/howto-use-heavens-above-com-to-track-th... == Other ISS tracking methods == == Websites: == ISS Fan Club http://issfanclub.com/ ISSTracker (no predictions, just live tracking) http://www.isstracker.com/ Android: Heavens-Above https://play.google.com/store/apps/details?id=com.heavens_above.viewer ISS Dectector Satellite Tracker https://play.google.com/store/apps/details?id=com.runar.issdetector iOS: Space Station (ISS) (not verified) https://itunes.apple.com/us/app/space-station-iss/id301984767?mt=8 = What to expect during a pass = SSTV mode PD120 will be used instead of PD180 which was used during previous SSTV events this year. With PD180 it takes about 3 minutes to send an image. With PD120 it takes about 2 minutes to send an image. Since images transmitted with PD120 take less time to send than with PD180, more images can be received during a single ISS pass. An ISS pass that goes right overhead (90 degrees elevation), lasts about 10 minutes. ISS SSTV transmit time and off time are usually setup to provide the radio with a 50% duty cycle (only transmit half the time so the radio doesn’t overheat). With image transmission taking two minutes, off time will probably be two minutes as well. Compared to previous SSTV events using PD180, this means it should be relatively easy to receive at least two complete images in one pass, with the possibility to receive up to three images if timing, conditions, and setup are ideal. When the ISS comes into view/has line of sight with you, this is known as Acquisition of Signal, or AOS. The ideal situation for a high elevation 10 minute pass would be if the first image started transmitting exactly at your AOS, and you had a directional antenna so you could receive the signal even while the ISS was very low in the beginning and end of the pass. In this case you would be able to receive three images like this: minute, image TX/off 0-2, complete image 1 2-4, off 4-6, complete image 2 6-8, off 8-9, complete image 3 The more common situation will be that the first image transmission will start either before or after AOS. In this case you will only have the opportunity to receive two complete images, but this is still twice the amount of images that were possible with PD180. The downside is the image quality is not as high as with PD180. Even though you’ll have the opportunity to receive two complete images, don’t expect to. It may take practice and it will certainly take the right setup and conditions, to get just one complete image. With that said, here are some tips that may help you get more images and/or better images. = Hints = == Check Twitter for #ISS #SSTV status and images == For several hours after the April and July 2015 SSTV events were scheduled to start, only a “blank signal” was transmitted. There was no audio so no images could be decoded. During these events Twitter users all over the world posted what they heard using hashtags #ISS #SSTV. As soon as people started hearing the SSTV audio, they reported it on Twitter. By searching for these hashtags you can stay up to date on the current status of the transmissions, which sometimes go longer than scheduled. Maybe more importantly, you can also see all the images people are getting! https://twitter.com/search?q=%23ISS%20%23SSTV More hints at https://spacecomms.wordpress.com/iss-sstv-reception-hints/
Views: 58568 Space Comms
Curtis Video Sender
 
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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: 1038 ottawaoctane
Why Has Govt Directed MSOs, LCOs to Stop Transmitting Analogue Signals From 30 April ?
 
01:50
The government has directed multi system operators (MSOs) and local cable operators (LCOs) to stop transmitting analogue signals from 30 April.
Watch this one video and never forget what Space Wave Propagation is
 
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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: 17420 Learnpedia
Broadcasting Digital TV w/ BladeRF - Part 1/2 - Software Defined Radio Series #21
 
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In this video I show how to install all the necessary tools for broadcasting our own digital TV signal! Topics covered: - Converting mp4 files to mpegts (.ts) with VLC - Using Camtasia to encode an mp4 file into lower resolution - Using sdr# (sdrsharp) to briefly look for unused frequencies - Virtual machine design for DVB-T TX and RX - Fixing the repository lists (/etc/apt/sources.list) - Testing that our DVB-T dongle (RTLSDR) is recognized as a DVB-T device - Using w_scan to scan for DVB-T channels - Installing the dependencies for compiling gr-dvbt - Compiling and installing gr-dvbt - Copying files to our TX VM with Filezilla and openssh-server 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) - mplayer Dependencies: (for gr-dvbt) sudo apt-get install gnuradio gnuradio-dev gqrx-sdr libboost-all-dev libcppunit-dev swig liblog4cpp5-dev cmake Force/Enable DVB-T Driver: sudo modprobe dvb-usb-rtl28xxu Check if DVB-T device was recognized: dmesg|grep dvb ls /dev/dvb/ Virtual Machines: - VMware Player (latest version) - Ubuntu (latest version) 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: 3367 Crazy Danish Hacker
ABS-CBN TVplus-Signal Test
 
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This video contains: 1st Scene: Antenna Used: Indoor Antenna Signal Testing: ABS-CBN: Good Signal GMA: No Signal 2nd Scene: Antenna Used: Baron Extended Range Antenna with Baron RG6 Coaxial Cable Signal Testing: ABS-CBN: Good Signal GMA: Good Signal Trivia: ABS-CBN maintained that it has nothing to do with the loss of GMA channel signal via TVplus digital boxes. ABS-CBN TVplus box, also known as “ang mahiwagang black box,” is a digital box that aims to provide clear reception for all free TV channels via digital transmission. In an official statement today, September 29, the Kapamilya network explained that an ABS-CBN TVplus box is merely a “receiver” of whatever digital TV transmissions it can pick up, but it has “no control over how other channels transmit their own digital TV signals.” This is in relation to five complaints before the National Telecommunications Commission (NTC) against ABS-CBN TVplus boxes' alleged signal disruptions, particularly during the airing of Eat Bulaga's Kalyeserye segment. The Kapamilya network further explained in a letter submitted to NTC dated September 24: “In short, the complainants suffered from a mistaken notion of what a receiver is and what it cannot do, and effectively side-tracked the more telling issue and that is, the program interruption was due to GMA’s own signal loss. “Signal loss due to GMA was confirmed because, not only were signals of other broadcasters during the time in question detected and received by the TVplus box, upon careful monitoring, ABS-CBN actually recorded an episode of signal loss from GMA leading to the signal loss experienced by the TVplus box. “The box itself cannot be a culprit in the signal loss since it is nothing more but a receiver, configured to detect, receive, and broadcast all available digital signals at any given time regardless of the provider (e.g. ABS-CBN, GMA, TV5) and so long as the provider is reliably transmitting such digital signals.” ABS-CBN also stressed, in the same letter to NTC, that it is the responsibility of GMA to explain to the public the reason behind the intermittent transmission of its own digital signal in Metro Manila. “The company has therefore asked the NTC to require GMA 7 to respond to these complaints as well. “Moving forward, it also said it would be ideal for NTC to forward all complaints about the reception of GMA 7’s digital signal by ABS-CBN TVplus boxes to both ABS-CBN and GMA 7.” To date, GMA has also filed separate NTC complaints against the ABS-CBN-owned SkyCable with regards to similar signal disruptions on the said cable service provider. Source: PEP.PH
Views: 21559 Don Isiah
Wireless Data Transmission by KitsGuru.com | LGKT080
 
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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: 7911 KitsGuru
Digital TV Transition: What You Need to Know
 
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On June 12, 2009 all full-power TV broadcasters will turn off their analog broadcast signals and only digital signals will be transmitting from broadcast towers. If you are currently using an analog television set to receive free, over-the-air programming, you will need to prepare for the DTV transition.
Views: 138 BusinessWire
Broadcasting  COLOR Channel 3 on an ESP
 
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I had a great time getting my ESP8266 to broadcast analog television! I went ahead and listened to a lot of comments, and got color working along with a much more expository explanation. As always, here's the github. https://github.com/cnlohr/channel3 P.S. The cnping network monitor is available here: http://github.com/cnlohr/cnping I now have a patreon, I am still trying to figure out how all this works! https://www.patreon.com/cnlohr The SDR software I used was from osmocom. The page and compatible dongles can be found here: http://sdr.osmocom.org/trac/wiki/rtl-sdr
Views: 59658 CNLohr
How Does Radio Transmission Work? | Iken Edu
 
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How Does Radio Transmission Work? | Iken Edu In this animation script we will learn about Radio. For more videos visit https://www.youtube.com/ikenedu Follow us on twitter https://twitter.com/ikenedu Like us on https://www.facebook.com/ikenconnect
Views: 31009 Iken Edu
TV SUCKS (RANT)
 
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Television (TV) is a telecommunication medium for transmitting and receiving moving images that can be monochrome (black-and-white) or colored, with or without accompanying sound. "Television" may also refer specifically to a television set, television program, or television transmission. The etymology of the word has a mixed Latin and Greek origin, meaning "far sight": Greek tele (τῆλε), far, and Latin visio, sight (from video, vis- to see, or to view in the first person). Commercially available since the late 1920s, the television set has become commonplace in homes, businesses and institutions, particularly as a vehicle for advertising, a source of entertainment, and news. Since the 1950s, television has been the main medium for molding public opinion.[1] Since the 1970s the availability of video cassettes, laserdiscs, DVDs and now Blu-ray Discs, have resulted in the television set frequently being used for viewing recorded as well as broadcast material. In recent years, Internet television has seen the rise of television available via the Internet through services such as iPlayer and Hulu. Although other forms such as closed-circuit television (CCTV) are in use, the most common usage of the medium is for broadcast television, which was modeled on the existing radio broadcasting systems developed in the 1920s, and uses high-powered radio-frequency transmitters to broadcast the television signal to individual TV receivers. The broadcast television system is typically disseminated via radio transmissions on designated channels in the 54--890 MHz frequency band.[2] Signals are now often transmitted with stereo or surround sound in many countries. Until the 2000s broadcast TV programs were generally transmitted as an analog television signal, but during the decade several countries went almost exclusively digital. A standard television set comprises multiple internal electronic circuits, including those for receiving and decoding broadcast signals. A visual display device which lacks a tuner is properly called a video monitor, rather than a television. A television system may use different technical standards such as digital television (DTV) and high-definition television (HDTV). Television systems are also used for surveillance, industrial process control, and guiding of weapons, in places where direct observation is difficult or dangerous. Some studies have found a link between infancy exposure to television and ADHD
Views: 2373 TheMYERSFAN25
10GHz Amateur TV Transmitter using Gunn Diode.
 
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A short video about my 10 GHZ ATV transmitter showing that you can easily build your own transmitter using a surplus Gunn Diode. You can find these in the older automatic door openers or house alarms. Remember, you need to hold a transmitting licence to use these devices. Microwaves can be dangerous at high power, so never stare into a powered horn. See my 10GHz voice video https://youtu.be/T8XLoPukvxE
Views: 5939 Darren Coe

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