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DTH installation

Introduction


DTH means Direct-To-Home Satellite TV. DTH bypasses the Cable operator and comes directly from the Satellite to our houses. We can view DTH TV in our homes by using a small antenna, Set-Top-Box (STB) and LNBF (Low Noise Block Down converter). Originally developed for connecting far-flung areas which do not have cable access this technology is now used world-wide for premium programming direct to the home bypassing cable operators or other forms of Satellite TV delivery.
Remember DTH delivers Laser Disc Quality Picture and CD quality Sound to the TV and makes viewing an ultimate experience which even your cable operator cannot provide.

 

 

The past year has seen a voluminous increase if the sales of hardware for the reception of Ku

signals in India. Small dish antenna systems for reception of the DTH signals from the NSS 6

satellite have proven, for the past year, to be the driving force in the industry. With the start of

the DD DIRECT DTH service, sales of dish receiving systems reminded one of the start of the cable

industry in the mid-nineties, when the launch of every new satellite of channel in India, would

send sales of dish antennae, LNBs and receivers soaring. Similar is the case of what is happening

now with Ku-system sales.

Lets look at the dish first.

However, many questions arise. The use and

installation of the Ku antenna is not the same as for

a C-band antenna. In fact we receive numerous

queries at our office, whether an existing C-band

antenna can be used for reception of Ku signals. The

answer is yes and no - depends on how good quality

your existing antenna is. If it's a solid sheet or

perforated antenna (with tiny holes) then yes,

however you would have to change your LNB of

course.

If you are using the old chicken-mesh type of

antenna, then no way

Offset dishes are commonly found in DTH systems. The surface of an

offset fed dish is a section of a larger prime-focus parabola. The feed

assembly, which is still located at the focus of the larger "parent" dish,

appears to be offset from that portion of the reflective surface in use.

Since the feed/LNB structure is offset, it does not block incoming

signals.

In practice, no dish is perfect for a number of reasons. The feed at the

focal point is bigger than a "point" so it intercepts some signals arriving

from directions slightly off the main axis. Also, irregularities and

imperfections in the shape of the surface causes reflection errors so

that some off-axis signals are detected while some targeted signals

pass by unobserved.

Satellite & Cable TV

 

 

Components Used

 

 

 

 

Bibliography:

 

 

www.ludhianaprojects.com

 

 

www.google.com

 

 

www.wikipedia.com