| darkm4n |
Hi ,
I'am interested in how the satellite transmitters work , what do you need to transmit tv on a satellite , what dish ? what lnb ?
How big you need the dish to be ?
What is the principle ..
THank's ! |
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| Da5id4Vz |
Digital or analog distribution?
Fixed or portable uplink?
NTSC, PAL, SECAM, DVB or HDTV?
Full time or occasional transmissions? |
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| Da5id4Vz |
These are high level (no too technical) specifications for a large transportable uplink.
http://tinyurl.com/2jt3b |
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| darkm4n |
I want a fixed dish , full time , digital , dvb .. have any idee ?
P.S. someone installed today a antenna , that guy have a tool that show him some lines on a small screen , the intensiti of the signal , etc .. what is the name of that tool ? |
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| Da5id4Vz |
You’d be looking at something more like this, except without the truck and a bigger dish. The larger dish will have more gain and allow the HPA transmitters to be operated at lower power.
http://tinyurl.com/2p6vx
The bar graph you saw is an indication of the signal strength of the received signal. Dishes are usually given ruff azimuth (east to west) and elevation settings based on there location to see a specific satellite. The settings are usually reads off a table based on a postal code that roughly translates to a location on the globe. The table has calculated Az-El for the satellites visible from that location.
Because the dish can only be roughly adjusted in this fashion, the signal strength meter is used while the dish is adjusted to maximize its value, indicating that it is "peaked" onto a specific satellite.
The system shown here has a GPS device that automatically positions the dish to locate bacons transmitted by the satellite. These are typically found on portable uplinks that travel long distances to allow the operator to quickly locate and peak on to the correct satellite. |
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