The working of Direct TV is pretty straightforward. There exists a miniature dish which serves the purpose of receiving television broadcast signals from the relevant communication satellite. In addition to this, there exists a receiver that is integrated as part of this miniature dish. What’s more, this receiver can also double up as a decoder. This ensures that there is a segregation of channels as well as a modulation from digital signals of the satellite to analog signals for television sets.
Direct TV uses several satellites that are responsible for providing signals to specific geographical regions within the US. These satellites are:
-The DBS-1 Satellite
-The DBS-2 Satellite
-The DIRECTV 1-R Satellite
-The D4-S Satellite
-The DIRECTV 5 Satellite
-The DirecTV 6 Satellite
The above satellites employed by Direct TV for this purpose are specialized geosynchronous satellites. Spread across three locations on their orbit, their common orbital distance is calculated to be at a distance of roughly 22000 miles above the surface of planet earth. Since the rhythm of the revolution of these satellites is in sync with the rhythm of the rotation of planet earth, these satellites always appear to be physically present above their same pre-allocated spots above the surface of earth. This renders their broadcasting footprint as permanent. Further, it makes them feasible for permanent signal transmissions pertaining to their locally assigned channel programming.
Its base stations operate from California, Castle Rock, Colorado and Los Angeles respectively. The base station and satellites together form a system that facilitates the following:
-Instant analog to digital modulation
-Digital Signal compression
-Digital Signal Decompression
-Digital to analog demodulation
Together this ensures service availability across a larger area of intended Direct TV subscribers. It’s the digital signal compression and decompression that enables 100% retention of its sound and picture quality throughout the transmission and reception processes.
Source by Arrnica Dayannandan