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FAQ 232-2002-es

What is impulsive noise?
How can it be overcome?

Respuesta: 

The impulsive noise does not last long and is characterised by a fast rise time. It can appear both in the UHF and in the VHF band.

Our industrial activity pollutes the RF spectrum with signals that affect other TV channel carriers.

The polluting agents are the power lines, car ignitions or home appliances.
COFDM digital receivers can be affected and can work incorrectly if the impulsive noise is considerable; The image freezes for a moment or disappears entirely.

To solve this problem, a higher input signal level is necessary in the digital receiver.

Both the DAT45 antenna and the MRD work together to achieve the best reception for digital terrestrial TV.

The impulsive noise can enter the network mainly via the antenna, the mast amplifier or the cable.

An antenna with a high level of directivity like the DAT45 , adequately orientated, will not receive the impulsive noise from the street.

The MRD (as it is located next to the dipole) avoids the amplification of the noise that would enter via the cable if it were situated on the mast.

The diecast chassis helps to avoid the ingress of noise through the junction box. The 12 dB gain makes the signal levels higher without allowing the analogue channels to cause the saturation of the digital receivers.

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