DTH does away with the need
for the local cable operator and puts the broadcaster directly in touch with the
consumer. Only cable operators can receive satellite programmes and they then
distribute them to individual homes.
How does DTH work?
A DTH
network consists of a broadcasting centre, satellites, encoders, multiplexers,
modulators and DTH receivers.
A DTH service provider has to lease Ku-band
transponders from the satellite. The encoder converts the audio, video and data
signals into the digital format and the multiplexer mixes these signals. At the
user end, there will be a small dish antenna and set-top boxes to decode and view
numerous channels. On the user's end, receiving dishes can be as small as 45 cm
in diametre.
DTH is an encrypted transmission that travels to the consumer
directly through a satellite. DTH transmission is received directly by the consumer
at his end through the small dish antenna. A set-top box, unlike the regular cable
connection, decodes the encrypted transmission.
How does DTH really differ
from cable TV?
The way DTH reaches a consumer's home is different from
the way cable TV does. In DTH, TV channels would be transmitted from the satellite
to a small dish antenna mounted on the window or rooftop of the subscriber's home.
So the broadcaster directly connects to the user. The middlemen like local cable
operators are not there in the picture.
DTH can also reach the remotest
of areas since it does away with the intermediate step of a cable operator and
the wires (cables) that come from the cable operator to your house. As we explained
above, in DTH signals directly come from the satellite to your DTH dish.
Also,
with DTH, a user can scan nearly 700 channels!
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