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: 100928 IowaPublicTelevision
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: 121535 7activestudio
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: 23757 Jeff Quitney
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: 58055 dazaro3
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: 154091 MrThriveAndSurvive
What Is the difference between analog and digital, and how do they work together to make modern life possible? Audible message: Thanks to Audible for supporting our channel. Get a free 30 day trial at http://www.audible.com/techquickie. Follow: http://twitter.com/luke_lafr Join the community: http://linustechtips.com License for image used in this video: https://creativecommons.org/licenses/by/3.0/legalcode
Views: 447565 Techquickie
Our TV shows have been broadcasting into space at the speed of light. The Twitter account @planettvguide is tracking when old TV signals reach planets that exists outside our solar system (we call these ‘exoplanets’). What’s showing on Alpha Centari? When will Seinfeld reach Pegasi b? Find out in our interplanetary TV guide!
Views: 5542 Vocativ
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: 335259 creepypaste
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: 745857 AtomModel
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: 152907 Dana Lee
Commenters LOVE to quote "Science" papers and their supposed expert knowledge when trying to hold onto the GLOBE LIE. However, common sense and REAL life experimentation [What science used to be before it became a belief system] trumps what any expert in science says - EVERY TIME. There are certain laws which cN'T BE BROKEN. dB GAIN WITH TRANSMISSION OF AUDIO AND VISUAL SIGNALS are no exception. You need POWER to transmit through space - even space with no impedence. Video Link: https://youtu.be/8ueKXD1Bbd8
Views: 8154 MrThriveAndSurvive
*** 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: 577012 weBoost
http://alternatesatellitetv.blogspot.com/ A Few Words On How Does Satellite TVWork There are times when you wonder about things that you take for granted around you. For example, do you know how Satellite TVdoes work? Today the latest and most advanced transmission of TV signals are via satellite. This is a well known fact; however, few would be able to say how this is done. How Does Satellite TVWork -- The Answer Made Simple Once upon a time Satellite TVmeant a lot of expenses, a huge reception antenna plus a huge effort and cost in maintenance. Today, these same antennas have become compact and highly efficient for which they are available in almost every home. This is great for those who stay out of the coverage of terrestrial antenna or cable services because Satellite TVcan capture TV signals anywhere on earth. Regular TVs antenna uses radio waves which travel in straight line to transmit the signals. In order to receive these signals, you would need to have your own TV antenna in direct line with the main TV station terrestrial antenna. Hence, the coverage area through this process is definitely limited. Coming back to the question on how does Satellite TVwork, you will learn that the signals in this case are sent from the main TV antenna to the satellite, which acts as both a receiver and transmitter. The signals from the TV station are sent up to the satellite. The satellite orbits the earth once exactly every 24 hours making it stationary according to the movement of the earth whose rotation around its axis also takes 24 hours. This makes it possible for the satellite to distribute the signals to an immensely large area by its mere positioning. Millions of dish antennas are positioned in straight line with the satellite making it possible for you to view your favorite program on your TV. It Is Simple Once You Know How Does Satellite TVWork In other words, the Satellite TVworks the same way as the regular TV works -- the only difference being that its signals are bounced off a satellite instead of being transmitted in straight line over the surface as the case with the terrestrial antenna. In this way the signals can be dispersed over a very large area making it possible for people who live in rural or inaccessible areas to get crystal clear TV broadcast via the satellite. A small clarification about the question on how does the satellite work -- the Satellite TVdoes not have any program of its own; it rather functions as a reflector for the regular TV signals. Those who get the signals with the help of the satellite dish (as they are popularly known) antennas decode the signals with a special key which is also used to determines the cost of the service. More.... How Satellite TV Work How Satellite TV Work How Satellite TV Work satellite tv satellite tv on pc satellite tv on your computer satellite tv on your pc soccer on your pc sports on your pc television television channels television on computer television on my computer DirecTV Dish Network Sky Starchoice XM Radio Sirius television on pc television on the computer television on your computer television on your pc to watch tv on your pc tv channels on computer Free Satellite/Cable TV Watch Live Football Now Watch Live TV on Internet adult tv on pc cable cable digital tv on your pc cable tv cable tv channels on your pc cable tv on computer cable tv on pc cable tv on your computer cable tv on your pc can i watch tv on my computer computer on tv computer screen o How Satellite TV Work
Views: 244387 squidooprofits
This is my theory on how satellite TV and other satellite reception is performed. It would be nice if we had reports from around the work which tells us what direction and angle to direct satellite TV dishes. If you care to report this, please give the name of your Satellite provider. Please remember to sign-up for updates. Should YouTube close down the channel, you can be updated immediately. Plus, get updated on the new site by using the following link: www.mrthriveandsurvive.com/team-thrive-survive-sign-up-form/
Views: 12727 MrThriveAndSurvive
DTV THALNA Hot Plug, Air cooled system just plug and play!
Views: 140 Itelco Broadcast srl
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: 24434 Paulo Ramos
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: 1723 SignalsEverywhere
On 11 July 1962 this site transmitted the first transatlantic TV signal to a twin station in Pleumeur-Bodou, France via the TELSTAR satellite. The success of TELSTAR and the earth stations, the first built for active satellite communications, illustrated the potential of a future world-wide satellite system to provide communications between continents. The First Transatlantic Transmission of a Television Signal via Satellite was named an IEEE Milestone in July 2002 http://ethw.org/Milestones:First_Transatlantic_Transmission_of_a_Television_Signal_via_Satellite,_1962
Views: 404 engineeringhistory
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
Views: 22106 VidOvation - Moving Video Forward
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: 59575 Space Comms
Digital TelevisionDigital TV is a system of transmission of video and audio signals from a broadcaster to a TV set, that uses digital modulation and compression to transmit data. The basis of the modern digital television is the MPEG compression standard. The current trend in broadcasting is to transmit and receive the information digitally. Even now many companies in our country offer to their subscribers TV programs in digital format, but their services are not available to all users yet. It is expected that by 2015 all citizens of Russia will be provided with digital TV based on our country's program of development of the DVB European digital television system, one of the European standards for digital television.Subjective perception of digital TV and analog TV nowadays is almost equal in the eyes of a viewer. The gain is that the quality of digital TV reception in any environment remains high, both for stationary TVs and portable ones, even in a moving vehicle.The main features that distinguish the European system of digital television from the others, are the following: more efficient use of television transmitter power, high noise immunity, adjustable speed of digital TV signal transmitter (from 5 to 32 Mbps), ability to receive digital television signals even in moving objects. One of the main characteristics is the DVB system frequency band. Is should meet the frequency band of the analog television channels, that is 8 MHz. Moreover, the medium for transmission of digital television signal remains the same: cable (cable TV) or broadcasting. In broadcasting the signal can be transmitted either by means of a satellite or by a rebroadcasting transmitter. The advantages of digital broadcasting are mostly the best viewing quality of a signal and higher bandwidth of broadcasting network.TV sets, which we have been using to this day, can't receive a digital signal. But this does not mean that you should get rid of your TV set until 2015.Any TV set, which has an antenna input, even the good old "Temp", will do. An "intermediary" between the TV set and the medium of transmission is the decoder, or the so-called set-top-box, i.e., the device that we will place at the top or near the TV. The device accepts a digital signal, converts it into the analog format and feeds it to the input of TV receiver: viewers just need to select a desired channel and watch their own, beloved and still flawless and faultless TV set. Well, and maybe by that time we will save some money to buy a new one, and we will enjoy the new product of some eastern manufacturer, even if we still doubt their guaranteed quality somewhere deep down!
Views: 1690 ChipDipvideo
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: 14207 Grensom
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: 136730 Technical Guruji
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Views: 17796 University Academy- Formerly-IP University CSE/IT
NASA INFO: Original Mission Video as aired in July 1969 depicting the Apollo 11 astronauts conducting several tasks during extravehicular activity (EVA) operations on the surface of the moon. The EVA lasted approximately 2.5 hours with all scientific activities being completed satisfactorily. The Apollo 11 (EVA) began at 10:39:33 p.m. EDT on July 20, 1969 when Astronaut Neil Armstrong emerged from the spacecraft first. While descending, he released the Modularized Equipment Stowage Assembly on the Lunar Module's descent stage. A camera on this module provided live television coverage of man's first step on the Moon. On this, their one and only EVA, the astronauts had a great deal to do in a short time. During this first visit to the Moon, the astronauts remained within about 100 meters of the lunar module, collected about 47 pounds of samples, and deployed four experiments. After spending approximately 2 hours and 31 minutes on the surface, the astronauts ended the EVA at 1:11:13 a.m. EDT on July 21. Apollo 11 "ALL RARE PHOTOS": https://www.flickr.com/photos/mrdanbeaumont/sets/72157630355089982/ Apollo 11 "ALL NEWSPAPERS / MAGAZINES": https://www.flickr.com/photos/mrdanbeaumont/sets/72157637533255196/ Apollo 11 "ALL VIDEOS": https://www.youtube.com/playlist?list=PL-HsE-FedVRirgWXw_-ik1n6fshAbcSeL NASA INFO: In July 2009 in celebration of the fortieth anniversary of the Apollo 11 moon landing, NASA released newly restored video from the July 20, 1969, live television broadcast of the Apollo 11 moonwalk. The initial video release, part of a larger Apollo 11 moonwalk restoration project, features 15 key moments from the historic lunar excursion of Neil Armstrong and Buzz Aldrin. A team of Apollo-era engineers, who helped produce the 1969 live broadcast of the moonwalk, acquired the best of the broadcast-format video from a variety of sources for the restoration effort. These included a copy of a tape recorded at NASA's Sydney, Australia, video switching center, where down-linked television from Parkes and Honeysuckle Creek was received for transmission to the U.S.; original broadcast tapes from the CBS News Archive recorded via direct microwave and landline feeds from NASA's Johnson Space Center in Houston; and kinescopes found in film vaults at Johnson that had not been viewed for 36 years. "The restoration is ongoing and may produce even better video," said Richard Nafzger, an engineer at NASA's Goddard Space Flight Center in Greenbelt, Md., who oversaw television processing at the ground tracking sites during Apollo 11. "The restoration project is scheduled to be completed in September and will provide the public, future historians, and the National Archives with the highest quality video of this historic event." NASA contracted with Lowry Digital of Burbank, Calif., which specializes in restoring aging Hollywood films and video, to take the highest quality video available from these recordings, select the best for digitization, and significantly enhance the video using the company's proprietary software technology and other restoration techniques. Under the initial effort, Lowry restored 15 scenes representing the most significant moments of the three and a half hours that Armstrong and Aldrin spent on the lunar surface. NASA released the video Thursday at a news conference at the Newseum in Washington. On July 20, 1969, as Armstrong made the short step off the ladder of the Lunar Excursion Module onto the powdery lunar surface, a global community of hundreds of millions of people witnessed one of humankind's most remarkable achievements live on television. The black and white images of Armstrong and Aldrin bounding around the moon were provided by a single small video camera aboard the lunar module. The camera used a non-standard scan format that commercial television could not broadcast. NASA used a scan converter to optically and electronically adapt these images to a standard U.S. broadcast TV signal. The tracking stations converted the signals and transmitted them using microwave links, Intelsat communications satellites, and AT&T analog landlines to Mission Control in Houston. By the time the images appeared on international television, they were substantially degraded.
Views: 32694 Dan Beaumont Space Museum
Broadcast television systems are encoding or formatting standards for the transmission and reception of terrestrial signals. Nature of television broadcasting; 2 types our 8 month program in radio & broadcasting will teach you what it's like to work a real studio on daily basis, as well train the “Behind mar 11, 2016 while millions people watch each day, many them are not quite sure how technology works. How television broadcasting works the tech faq. The term 'broadcast television' can refer to the television programs of such networks broadcast systems. Television broadcast stations on satellite. Feb 19, 2016 can i receive television broadcast stations on my satellite system? Yes. Free christian movies, educational and entertaining programs for families, teens, children, all. Broadcasting wikipedia en. Television broadcast programming associate in science television broadcasting radio & central texas collegesatellite jehovah's witnesses. Television wikipediabroadcast television systems wikipediaoutline of broadcasting wikipediabe on air. Federal communications. Tv broadcaster career information study. There were three main analog television systems in use around the world until late 2010s (expected) ntsc, pal, and secam terrestrial or broadcast is a type of broadcasting which signal transmitted by radio waves from following outline provided as an overview topical guide to contents. The radio television broadcasting tv technology the digital authority serving broadcast, cable, production, post business and new media markets streaming, on demand video audio. A radio or television broadcast (noun) is a program that tv broadcasts programming received through an antenna. Description for 4833 television broadcasting stations osha. There are different ways satellite subscribers can get television. Googleusercontent search. What is broadcast? Definition from whatis howstuffworks. Included in this programming broadcast is the transmission of television stations' (sometimes called channels) that often directed to a specific audience empire state building ('esb') has been involved broadcasting since 1931 and 1939, they introduced first regular broadcasts with digital television's picture sound quality are either 100. Official jw broadcast establishments primarily engaged in broadcasting visual programs by television to the public, except cable and other pay services. It may come over the air as with a radio station or television to an antenna and receiver, through cable (or 'wireless cable') via directly from network. Wikipedia wiki broadcasting url? Q webcache. Find out how the video signal and sound get to your tv people who searched for broadcaster career information found following related articles links useful radio television broadcast programming, associate in science program trains students a state of art, high definition facility perform dec 3, 2005 on september 29, 1948, from new building near atlanta's peachtree street, first live commerci
Views: 136 Question Tray
Top 10 creepy mysterious radio and television transmissions. Coded government, paranormal or alien messages. Subscribe to our channel: http://goo.gl/9CwQhg Description: When it comes to enjoying entertainment, we are comforted by the fact that there is security and consistency in various forms of broadcasting from radio to television thanks to rules and regulations. If you’re not an engineer, basically the way that these broadcasts work is that there are satellite dishes and signals that run through the sky and electrical wiring to bring you the entertainment that you so desire. Almost on a regular basis, things go smoothly. Notice how we say, “almost”? When you’re dealing with radio waves and television signals, occasionally someone else figures out how to infiltrate the system and hijack the broadcast. This is equally alarming for the both the audience and station executives, as you don’t know what will come through the speakers or the screen. There could be a gruesome message or image that will upset the public, corrupt the children, or expose confidential information. For decades, originating in the 20th century, there have been numerous interruptions in broadcasting. Usually it is pretty easy to detect the origin and the perpetrator. But when the source of the hijacking isn’t found, there is a sense of unease that leaves us to wonder when will another interruption strike again. In this video are ten strange and unexplained broadcasts that have made an impact on our modern day society and how big of a role censorship plays in modern day media. However, it is important to note that after the first world war, it came out that there was a plethora of radio stations that became known as “numbers stations”, meaning that they would broadcast weird transmissions that acted as messages for spy agencies. This means that instead of sending letters, Morse code messages, or anything that could be easily intercepted, spies and government agencies tuned into radio stations for their messages and orders. It sounds like a conspiracy theory, but things such as these actually happened during times of war. The Lincolnshire Poacher station is considered to be a numbers station, with the English folk song signaling the beginning of the broadcast, and the song closing the broadcast. UVB-76 is also considered to be a numbers stations with buzz tones changing pitch about 25 times per minute that occurs 24 hours a day, and then a Russian voice interrupting the broadcast on occasion. Sometimes, broadcast interruptions happened because of jokers and people who wanted to inflict discomfort onto the public. For example, in 1977, the Southern Television Broadcast was an incident consisting of a voice overriding the audio system and sounding like a message from outer space. Some people may have heard the broadcast and chalked it up to jokers, while others may have actually thought that the broadcast was from aliens and that the world was on the brink of an invasion. Sometimes interruptions occurred due to political and protesting reasons. For more strange and unexplained broadcasts, check out the rest of the video. Some of these broadcasts may confuse you, make you laugh, or positively terrify you. Our Social Media: Facebook: https://www.facebook.com/TheRichest.org Twitter: https://twitter.com/TheRichest_Com Instagram: http://instagram.com/therichest Featuring: Southern Television Broadcast UVB-76 The Whalesong The Wow Signal Max Headroom Pirating Incident Pornographic Interruptions The Lincolnshire Poacher WKCR 89.9 The E9 Magnetic Fields Station Swedish Rhapsody Station Music Track: Be Very Afraid For more videos and articles visit: http://www.therichest.com/
Views: 1530119 TheRichest
more at http://showbiz.quickfound.net/tv_news_and_links.html Tells the story of the first commercial UHF television station, KPTV, Channel 27, in Portland, Oregon, and of the advantages of TV sets made by the Zenith Radio Corporation. Public domain film from the Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and 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). http://creativecommons.org/licenses/by-sa/3.0/ http://en.wikipedia.org/wiki/UHF_television_broadcasting#United_States UHF television broadcasting is the use of ultra high frequency (UHF) radio for over the air transmission of television signals. Soon after the introduction of television broadcasting, the demand for additional stations in urban areas motivated the allocation of UHF frequencies to provide additional non-interfering channels. The high demand for mobile radio services and the difficulty of covering a large area with powerful transmitters at these frequencies has led to reallocation of television channels to other services. Digital television often uses UHF channels, providing additional programming content in the same bandwidth... United States On December 29, 1949, KC2XAK of Bridgeport, Connecticut, became the first UHF television station to operate on a regular daily schedule. The first commercially licensed UHF television station was WWLP in Springfield, Massachusetts; however, the first commercially licensed TV station on the air was KPTV, Channel 27, in Portland, Oregon, on September 18, 1952. This TV station used much of the equipment, including the transmitter, from KC2XAK. American television broadcasting, which began experimentally in the 1930s with some regular commercial broadcasting in just a few cities (such as New York and Chicago) in 1941, was originally allocated (by the Federal Communication Commission – the FCC) broadcasting channels solely in the VHF (Very High Frequency) band. All VHF TV channels except channel 1 through 13 had been removed from the FCC allocation list during World War II and those frequencies re-allocated for military use, leaving thirteen channels as of May 1945... After VHF Channel 1 was re-allocated to land-mobile radio systems in 1948 due to radio-interference problems, a mere one dozen TV channels remained. These were found to be not enough to serve the needs of television broadcasting as it grew nationwide during the latter 1940s and the 1950s... With a grand total of 106 VHF stations broadcasting by the end of the 1940s in the U.S., problems with interference between stations due to some overcrowding of stations were already becoming apparent in the densely populated areas, such as the eastern mid-Atlantic states (New York, Pennsylvania, New Jersey, Delaware, Maryland, and Connecticut) and Southern California. In 1949, the Federal Communications Commission stopped accepting applications for licensing new stations (a freeze that lasted until 1952) in order to address questions such as the allocation of additional channel frequencies, and also the selection of an electronic system for color television. Allocating more of the VHF band (30 to 300 MHz) by moving existing radio communication users off this band seemed to be impossible... When the Freeze ended in 1952, the television industry exploded. It grew from the 108 pre-Freeze stations to more than 530 in 1960... The majority of the 165 UHF stations to begin telecasting between 1952 and 1959 did not survive. Under the All-Channel Receiver Act, FCC regulations by 1965 would ensure that all new TV sets sold in the U.S. had built-in UHF tuners that could receive channels 14–83. In spite of this, by 1971, there were only about 170 full-service UHF broadcast stations nationwide... http://en.wikipedia.org/wiki/Zenith_Electronics Zenith Electronics LLC is an American brand of consumer electronics owned by South Korean company LG Electronics. The company was previously an American manufacturer of radio and television receivers and other consumer electronics, and was headquartered in Glenview, Illinois... The company was co-founded by Ralph Matthews and Karl Hassel in Chicago, Illinois as Chicago Radio Labs in 1918 as a small producer of amateur radio equipment. The name "Zenith" came from ZN'th, a contraction of its founders' ham radio call sign, 9ZN. They were joined in 1921 by LCDR Eugene F. McDonald, and Zenith Radio Company was formally incorporated in 1923. Zenith introduced the first portable radio in 1924, the first mass-produced AC radio in 1926, and push-button tuning in 1927. It added automobile radios in the 1930s... The first Zenith television set appeared in 1939, with its first commercial sets in 1948...
Views: 18688 Jeff Quitney
Cable TelevisionCable television is a system of television broadcasting, where the television signal is distributed with the help of high-frequency signals transmitted through cables. Cable television is totally different from ground-based or satellite broadcasting. The success in developing optical data transmission resulted in implementation of optical fiber in the cable television network. Cable television has set its ground of progressing development in Russia and in the far abroad. The processes of inventing new, and developing and expanding the old cable television networks tend to grow faster and faster year by year. It looks like after a swing towards mass liking for satellite television, high-definition television, internet broadcasting in all the different forms and moving reception television, the technical progress of the electronic mass media industry is again at the point of virtual space, when broadcasting gives way to a physical carrier.The equipment used in cable television helps to develop cable television networks of any scale providing the subscribers with all the possible services, like satellite dishes, antennas, digital receivers, head-end stations, metering equipment, optical transmitters, receivers, amplifiers, fiber optic cables, optical instruments, coaxial cables, equipment for coaxial main and subscriber networks, splitters, slots, adapters, digital equipment for head-end stations, telemetric equipment.Connecting cable TV... Instead of a gap filler, there is a fully equipped cable TV studio receiving signals of various television companies from different satellites. The signal in this studio is converted to the analogue signal, but rather than being broadcasted it is distributed through the cables to different subscribers. Each subscriber has such cable in his/her apartment, and there is absolutely no need to use an antenna. One just needs to plug in the cable into the television.So it is all very simple! Just pay the subscription fee to the operator in your district and you can enjoy broadcasted and satellite television as much as you want - 24/7. The available channels are full of entertainment programs and information with all of its myths and realities. However, you could also stick to the good old way of a regular antenna and watch the news that remain unchanged and something else useful and informational! After all, we are not yet forced to switch to digital television.
Views: 2921 ChipDipvideo
Subscribe for a new video every week! ►► http://goo.gl/lYWszy Check out the NEW Top5s website! ►► http://www.Top5s.co.uk ______________________________________________________ A broadcast interruption or intrusion is basically the act of hacking into a radio or TV station and hijacking it with a message. It may seem like a funny prank but can actually be pretty eerie. Well, here are five times a tv or radio station was interrupted with strange messages, including a believed message from an intergalactic alien to a phone-in from a supposed Area 51 worker who caused the radio stations signal to mysteriously cut off. ______________________________________________________ Don't forget to follow TOP5s on Social Media to keep up with upcoming videos and information! :) Twitter - https://goo.gl/4mqt4e Facebook - https://en-gb.facebook.com/TheOfficialTop5s/ Instagram - https://www.instagram.com/thetop5sofficial/?hl=en Special Thank you to CO.AG for the awesome 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/UCcav... Thanks for watching and stay awesome! Top5s
Views: 11118592 Top5s
http://alternatesatellitetv.blogspot.com/ A Few Words On How Does Satellite TVWork There are times when you wonder about things that you take for granted around you. For example, do you know how Satellite TVdoes work? Today the latest and most advanced transmission of TV signals are via satellite. This is a well known fact; however, few would be able to say how this is done. How Does Satellite TVWork -- The Answer Made Simple Once upon a time Satellite TVmeant a lot of expenses, a huge reception antenna plus a huge effort and cost in maintenance. Today, these same antennas have become compact and highly efficient for which they are available in almost every home. This is great for those who stay out of the coverage of terrestrial antenna or cable services because Satellite TVcan capture TV signals anywhere on earth. Regular TVs antenna uses radio waves which travel in straight line to transmit the signals. In order to receive these signals, you would need to have your own TV antenna in direct line with the main TV station terrestrial antenna. Hence, the coverage area through this process is definitely limited. Coming back to the question on how does Satellite TVwork, you will learn that the signals in this case are sent from the main TV antenna to the satellite, which acts as both a receiver and transmitter. The signals from the TV station are sent up to the satellite. The satellite orbits the earth once exactly every 24 hours making it stationary according to the movement of the earth whose rotation around its axis also takes 24 hours. This makes it possible for the satellite to distribute the signals to an immensely large area by its mere positioning. Millions of dish antennas are positioned in straight line with the satellite making it possible for you to view your favorite program on your TV. It Is Simple Once You Know How Does Satellite TVWork In other words, the Satellite TVworks the same way as the regular TV works -- the only difference being that its signals are bounced off a satellite instead of being transmitted in straight line over the surface as the case with the terrestrial antenna. In this way the signals can be dispersed over a very large area making it possible for people who live in rural or inaccessible areas to get crystal clear TV broadcast via the satellite. A small clarification about the question on how does the satellite work -- the Satellite TVdoes not have any program of its own; it rather functions as a reflector for the regular TV signals. Those who get the signals with the help of the satellite dish (as they are popularly known) antennas decode the signals with a special key which is also used to determines the cost of the service. More.... How Does Satellite TV Work How Does Satellite TV Work How Does Satellite TV Work watch sat tv on your pc watch satellite cable watch satellite cable digital tv on your pc watch satellite tv on pc watch satellite tv on your pc watch sky tv watch television on computer watch television on your computer watch tv on a computer watching tv on your pc watch tv on a pc watch tv on computer watch tv on my computer watch tv on my pc watch tv on pc watch tv on the computer watch tv on the pc watch tv on your computer watch tv on your pc watching tv on a pc watching tv on computer watching tv on my computer watching tv on my pc watching tv on pc watching tv on the computer watching tv on your computer computer view tv computer view tv on pc watch cable tv on computer watch cable tv on pc watch football on pc watch live football on pc watch live tv on pc How Does Satellite TV Work
Views: 7825 squidooprofits
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: 66 Tell sparky
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: 147217 CNLohr
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: 13433 Academia
The Jubilee Government today made good its threat to switch off all broadcasters, who defied express orders, not to air live proceedings of the swearing in of Raila Odinga, as the "People's President", at Uhuru Park. This morning, a group of officers from the Communication Authority and the National Police service, raided several transmission sites owned and independently run by media houses, and literally disabled the television signals. This move has been widely condemned, as Ken Mijungu reports. Watch more NTV Kenya videos at ntv.co.ke and nation.co.ke. Follow @ntvkenya on Twitter. Like our page on Facebook: NTV Kenya. Follow and Double tap on Instagram: NTV Kenya Join Our Telegram channel: www.telegram.me/NTVNewsRush
Views: 3013 NTV Kenya
The video transmission market is mainly supported by the distribution of video content on pay-TV platforms, with TV signals delivered to viewers either directly by satellite or through the head-ends of terrestrial networks. According to the Euroconsult's just-released 'Video Transmission Services over Satellite report an estimated 25,000 TV signals were transmitted by satellite by year-end 2010.
Views: 275 SatelliteEvolutionTV
In this video we explore how we added color to everyone's favorite passive entertainment medium. Modern color broadcasting began in 1954 after years of experimentation, and this video will teach you the early history. Technology Connections is a YouTube channel dedicated to exploring the history of technological innovation. You can support this channel via a monetary contribution at https://patreon.com/technologyconnections Thank you to all current patrons! Benjamin Kord, Tommi Hares, Dakota Williams, Jeremy DeGuzman, Sean Spark, Lucas Hartbarger, Taylor Cuzela, twiglet, David Lastres, Granger Meador, Jeremy Kitchen, Jason Wellband, Shane Belaire, Paul Emmerich, Max Burns, Sam Hodge, Matthew Rossi, Paul Craigie, Alex Smith, Paul Williams, Dane Peterson, Brent LaRowe, Quinton Wilson, Aerospyke, Kieran Cox, Hunter Schwisow, wsh, Logan Kriete, Rafał Wiosna, Adam D. Ruppe, Audin Malmin, Eric Hansen, Noah McCann, Jason R Scheuren, Rufo Sanchez, Aaron Herbst, Bjørn Vegar Torseth, Yaniv, Matt Falcon, Stewart Harvath, Kevin Landrigan, Evan Papp, Jason Weathered, Jolyan g shaba, Stephen Youndt, Stephen Bell, Steven First, Howard Longden, Gianluca D'Orazio, Martin Granestrand, Anthony Pettit, Paul Ziegler, Stephen Furness, Joseph, Marty Connor, Wesley Van Pelt, Lorenzo Novara, Lee Lemoine, John Trevick, Elliot King, Paul Anderson, Gustaf Lindblad, Carl Yazbek, Nicholas, Matthew, Gary Generous, Daniel Mann, Harald E. Westlie, Daniel Newton, urbanhusky, Henri Hyyryläinen, James Holmes, Dave Anderson, Neil Hopwood, Duncan Middleton, Aric Vogel, Conor Killeen, Tyler Knott, Slone Fallion, KrzysFR, seagull, Robert Stadtmüller, Athanasios Kountouras, Gorka Alda, Jason Brammer, Sarah Symon, Francis Fisher, Tab Patterson, Philipp Thomasberger, Gustavo Carballeira, SkydiveWeee, Nolan Johnson, Samuel Kadolph, Robert Toth, Matthew Giraitis, Ellis M. Eisen, Tyler, Michael Shick, Thomas Jew, Eric Wood, Kasper Guldmann, Joe Bond, Eidorian, Cubase Academy, Nikolaj Sørensen, Jesper Hansen, John Kesson, cpb, Anonymous49856739245764, Jason Ganiatsas
Views: 160617 Technology Connections
Digital television (DTV) is the transmission of television signals, including the sound channel, using digital encoding, in contrast to the earlier television technology, analog television, in which the video and audio are carried by analog signals. DTTV is a major technological advance over the previous analog television, and has largely replaced analog which had been in common use since the middle of the last century. For more information on this report, Please visit at: https://bit.ly/2yu4Y00
Views: 9 Santosh Lakade