Direct-to-Home(DTH) is a technology that has changed the way people watch TV. It uses satellites to deliver a massive variety of broadcast content straight to your home. DTH has several advantages over traditional cable TV that make it attractive to users.
This article talks in detail about DTH technology, how it works, and its benefits and drawbacks.
Also Read: What is Satellite TV?
Contents
How Does the DTH Work?
DTH has several elements involved in delivering content to the end user, but broadly, it uses a small dish antenna to receive signals directly from a satellite.
The satellite leases Ku-band transponders to DTH network operators. Then, the encoder transforms audio, video, and data signals into a digital format while the multiplexer combines them. The dish antenna and set-top box on the user end will decode the signal and broadcast content to the user.
Elements of DTH Technology
Broadcasting Center
This is the system’s principal center that links television channels to satellites. The provider gets signals from multiple content sources and sends a broadcast signal to geostationary orbit satellites. The satellites receive the transmission from the broadcasting station and relay it back to the Earth.
Encryption Transmission
A key aspect here is that DTH transmissions are encrypted to prevent them from being obtained for free by non-paying users. Digital data is encrypted in such a way that it can be decrypted only if the receiver has the appropriate decoding equipment.
In other words, the broadcast center only sends the signal to its satellites after compressing and encrypting it. The satellite detects and sends the signal back to the Earth where the customer receives it.
The Satellite Dish
It is an antenna designed specifically to focus on a single broadcast source. A typical dish has a parabolic surface with a centered feed horn. A controller sends the signal through the horn while the dish concentrates it into a small beam and transmits it.
The feed horn is a crucial aspect of sending and receiving incoming radio signals. Therefore, there should be no huge obstructions between the satellite and the dish so it can receive a clean signal.
Multiplexer
This is a device that combines information from multiple channels in a single one. It is a component of the broadcasting center where it puts together all frequency signals into a single channel and sends it to the geostationary satellite.
Modulator
The method by which an information signal is superimposed on a strong carrier signal is called modulation. A modulator does this task and sends the signal to the encoder.
Encoder
The encrypted signals need to be decrypted before being transmitted to the end user. The encoder does this and then sends the signals from the satellite to the DTH antenna, which then transmits them to the set-top box.
The Receiver
The receiver decrypts the encoded signal and turns the digital stream into an analog format that a TV can identify.
Advantages of DTH
Better Signal
DTH technology offers far better signal quality compared to traditional cable TV. You can enjoy HD quality channels with superior pictures and sound with it.
Better Channel Selection
DTH services have a wide variety of channels and packages to choose from. You can choose packages based on your interests and preferences. Several regional and international channels are also available on it.
Interactive Features
DTH services these days come with several advanced and interactive features, such as electronic program guides(EPGs), video-on-demand(VOD), and interactive games. This enhances user engagement and provides them with additional content at their convenience.
Flexibility
DTH technology also offers users better flexibility and portability. It allows users to access their favorite channels anywhere with portable dishes and compact set-top boxes as long as they are within the coverage area.
Other Services
DTH providers offer many other value-added services, such as parental controls, subtitles, and multiple audio tracks.
Drawbacks of DTH
Setup Cost
The setup cost for DTH is higher compared to regular cable TV. This is because setting up a DTH connection involves costs for the dish, set-top box, and other related equipment.
Affected by Weather
DTH signals are heavily affected by bad weather conditions such as heavy rains, storms, and strong winds. This usually leads to signal loss.
Line of Sight Dependency
A clear line of sight between the satellite dish and the satellite is needed for a clear signal. Things like tall trees, buildings, and other structures can obstruct signal, leading to limited coverage in certain areas.
Subscription Charges
The monthly subscription charges for DTH channels and packages can add up over time, especially if you include additional services. This can be heavy on the pocket in the long run.
Local Channels are Limited
DTH service providers do offer a wide range of channels but their coverage of local and regional channels is usually limited.
Conclusion
DTH technology offers users more flexibility, portability, and choice compared to cable TV. Users get to enjoy a huge range of channels in HD quality and several interactive features. While OTT platforms like Netflix continue to grow, DTH has managed to maintain its share of TV network distribution. It has brought TV access to previously unserved areas and remains the first choice in many places.
