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Friday, 23-Mar-2012 11:48 Email | Share | | Bookmark
Comparison of Analogue and Digital Aerial Technologies

 

With the advancing technology today, a lot of data and products are turning digital. What does this mean? Digital technology makes use of zeroes and ones in data transmission; it is the latest mode of transmission for TV signals. Hence, digital aerial is becoming very popular as digital technology emerges from the advancing technology of today.

Analogue effects

Digital technology has proven to be more effective and cost savings compared to analogue technology. One can enjoy more viewing channels with a digital aerial than with an analogue aerial. A digital aerial is able to pick up more viewing channels than an analogue aerial in the same space capacity.

Analogue signals can be weak and difficult to receive by its corresponding aerial; thus, it is not surprising to view “grainy” displays due to the poor TV receptivity. This is a reflection of weak signals or reflected signals that do not permit clear viewings.

Analogue signals for analogue TV aerials must be above a certain threshold or level in order to enjoy good TV receptivity; this means signals of at least 47dB for clear viewings. Otherwise, grainy showings are expected. However, there are other parameters in play.

Digital effects

But a digital aerial for digital signals does not have such threshold although different parameters come to play.

A digital aerial can be impacted by pixelation; this refers to the block effect on the TV screen which can be annoying to some viewers. Digital signals could result in speech delays. This is caused by insufficient digital aerial signals; it could also be a result of an interfered signal or the occurrence of a reflected signal.

Digital aerial signals require a similar threshold like the analogue signals where a stepping across that level of digital signals will provide a clear TV reception. This is known as the digital cliff effect. However, other parameters that can affect clear reception can come into play; such as carrier noise (C/N) and bit error (BER) ratios. One has to be careful about receiving too much digital aerial signals as it can cause poor receptivity.

Correction of faults

Sometimes, it is easy to handle some of the poor
TV aerial
receptivity personally before calling in an aerial expert. There may be some simple causes to the errors such as improper plugging in of aerials, poor lead condition, improper installation of colex plugs and faulty sockets.

If these simple causes are not the main source of error, it is best to call in an aerial specialist to correct the fault.


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