Analog vs Digital Transmission Written by Gary Davis
Analog vs Digital Transmission By Gary DavisDish-Network-Satellite-TV.ws Webmasters: You may reprint this article in its entirety, providing you leave Byline and About Author sections intact, including links to Dish Network Satellite TV. Remember old days of analog TV, radio, etc. Most of us do unless you’re really young. And still today there are plenty of analog systems in use. Normal radio still uses analog transmission. But digital age has begun and more and more we will use digital systems rather than analog systems. Digital transmission systems have many advantages over analog transmission systems, like higher quality of audio and video. How come digital systems can transmit higher quality signals than analog systems? The truth is that they don’t. They just use some tricks to eliminate noise. Analog Transmission Systems When something like video and audio, is recorded by an analog system, recording has a certain quality. This recording (when done professionally) has a very high quality. When recording is transmitted it is modulated directly to a carrier wave, which is then transmitted through air, cable, via satellite, etc. During this transmission, carrier and modulated signal will loose amplitude (power) and due to interference noise is introduced to carrier and its modulated signal. The result will always be a received signal that has a lower quality than transmitted signal. Hence, modulated signal, recording, will also be of lower quality than original. Analog transmission systems are unable to maintain quality original has. Digital Transmission Systems In digital world recording can be transmitted to another place without loosing any quality. An exact copy of original recording is transmitted. So how come that digital transmission systems don’t loose quality when transmitting a signal?
| | Types of Satellite TV Systems - TVRO and DBSWritten by Gary Davis
Types of Satellite TV Systems – TVRO and DBS By Gary DavisDish-Network-Satellite-TV.ws Webmasters: You may reprint this article in its entirety, providing you leave Byline and About Author sections intact, including links to Dish Network Satellite TV. In USA there are 2 types of satellite TV systems. The first is TVRO which stands for TeleVision Receive Only. The second is DBS which stands for Direct Broadcast Satellite. TVRO – TeleVision Receive Only TVRO was first satellite system available for home viewing of satellite TV. It required a relatively big dish of 3 to 6 feet in diameter and worked in C-Band. Frequencies of around 4 G Hertz are called C-Band and require bigger dishes because wave length of these frequencies is longer than in Ku-Band which requires a much smaller dish of about 18 inches. Ku-Band is at 12 to 14 G Hertz. TVRO systems also need a movable dish because it needs to get all channels of many satellites. C-Band satellites have much less channels available than Ku-Band satellites and therefore more satellites are needed to provide enough channels. Possibilities that exist with TVRO systems is that you can also receive free channels and independent feeds from for instance news companies. You could for instance receive unedited material that is broadcasted from a news crew somewhere in coverage area of satellite. They transmit their materials to their headquarters using a C-Band satellite. Many of these types of feeds are not scrambled and are available to everyone with proper equipment.
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