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Digital Video Broadcasting

DVB is the method used for all digital TV and Radio broadcasting which is a multi-million pound industry. To recieve DVB is not as expensive as it is to transmit it. All that you would need is a suitable steerable antenna and motor controller, a suitable LNB and a PC with a receiver card. Alternatively, you could buy a Sky minidish and receiver, this is afterall a DVB receiver.

Channel Master AntennaSo why buy anything else? Well, having spent a few hundred pounds on a PC setup with a motorised dish, you could tune in and point at more than one satellite. This opens up a variety of normally unseen channels for your viewing pleasure. For example, the news feeds from war torn countries are to be found on a variety of satellites that bring the news reports back to this country or europe generally. From there they are sent to the news studio where they are edited into the program. Then the news program is sent to Astra for us to see at home on our minidish.

But whats the point? It's quite ammusing to watch those galant war reporters rehearsing their lines, messing with their hair and generally standing about for long periods of time. Sometimes the engineers that put the uplinks together and test the feeds are to be seen having fun and cracking jokes in front of the camera.

All of this is not widely known about because you need specialist kit to see it. However, if you want that specialist kit here is a relatively cheap solution:

  • Channel Master offset feed motorised antenna with LNB
  • Motor controller
  • Resonably Fast PC with decent graphics card
  • Pentamedia Pent@Value or Pent@Vision DVB Receiver Card

More information on the PC DVB receiver cards is available from http://www.pentamedia.com/

More information on the Channel Master antenna is available from http://www.channelmaster.com/

For a list of satellite internet service providers try http://www.uk-isp-directory.co.uk

So how does it all work?

Sky Mini DishWell the satellites all sit on a geostationary arc around the equator. Whether you are north or south of the arc is irrelevant. The satellites almost cover the whole planet in this way, so when a european news reporter in South Africa wants to send his live report back to the news room, he gets booked onto a satellite that can be seen from South Africa aswell as Europe. The time on the satellite is charged and is not cheap so the news room has to try and fit in the report with the rest of the news and then the report is made.

If the news room run out of time then the satellite time is wasted. Often the time is shared amongst a group of reporters from different news channels so that if the report is cancelled the overall cost is reduced because another reporter can step in. Having said that we have seen many feeds of countryside and mountains with nobody in site for over half an hour. This is probably the engineering setup time, or a handover between reporters. There is no point shutting down a link only to bring it back again in half an hour.

But how do the reporters uplink their story?

Aha, yes indeed, this is a good question. There are a number of companies making a number of 'Fly Away' satcom terminals which are specifically designed for SNG (satellite news gathering). These terminals are fairly small, self contained uplink terminals that have video and audio inputs, digital MPEG-2 video & audio encoders, engineering audio channels, upconverters, amplifiers and an antenna. They probably have receivers aswell but not always.

There are even companies selling all of this technology in a brief case. Quite simply you can now get on a plane with a small handheld digital video camera and a briefcase uplink system, fly to a war zone and report back in minutes of your arrival.

So what are you waiting for? Go out and buy a huge 2m antenna, a receiver card for your PC and start receiving those news feeds. Maybe not, but for those of you who are mad on satellites and want to know whats out there, they are free to air. No smart card required, all you need to know is on which satellite to find them, at what frequency and a few other parameters. You can get all this information at : http://www.satcodx.com/cd/ and also at http://www.lyngsat.com/ both of these sites provide detailed information on the satellites and channels so you can find out where to look.

If you want to get the movies and other pay to view channels you will need a Conditional Access Module (CAM) which attaches to the decoder card in the PC. These CAM's allow you to plug in your viewing card which you will also have to get from the service provider in the same way that you do to receive Sky.

The SATCODX website provides information for every Digital TV and Radio satellite, this information includes the location of the satellite as well as the programme parameters for each transponder and channel.

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