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DIGITAL SIGNAL MEASUREMENTS (Antenna Installation)
 

Digital Signal Strength:-

Minimum Level = 55 dBuV
Maximum Level = 77 dBuV

This is a talked about subject. Some industry players vary on the lower end however the upper end stays at 77dBuV.

Some installers say 40dBuV will suffice however, we at Quality Electrics always try to obtain 55dBuV and over.

With the old Analogue signal there was no maximum signal strength however, with the digital signal to much signal is bad. This is due to the operating window of the digital. See, there is a max and minimum level required for the operation of the receiver. This doesn't vary to much between receivers however, the minimum level is strictly 40dBuV and max is 77dBuV otherwise pixelisation and picture drop out will occur.

Analogue Signal Strength:-

Ideally the Level should be around = 66 dBuV or better

The analogue signal can be easily worked out but calculating the losses and gains in the system (ie: amplifiers (gain) splitters (losses)). Even a low signal strength will supply you with a TV signal however, it will be poor such as ghosting or snow.

 

Carrier to Noise Ratio (CNR):-

This is the ratio of carrier level compared to the noise level "outside" of the channel band width. CNR should be measured after any amplification. A CNR of >45dBuV is acceptable at the wall plate. Carrier to Noise Ration is the quality measurement for analogue TV signals. It does not give you any indication with regards to ghosting.

Modulation Error Ratio (MER):-

Minimum Level = 28 dB
MER is like beer! the more the merrier - joke :)

This term is the main reason to asses the digital signal quality. MER signal references are measured before error correction values, so it gives us a better idea of how the installation is performing when metering.

It's the measurement of the phase shift error to the RF (radio frequency) signal during the modulation and demodulation of the digital content.

 

 

On some digital meters you can see the MER in terms of little "spots" on the screen buching together or spacing apart. In basic terms the close the bunching the better the quality.

BIT Error Ratio (BER):-

BER is a measurement of the signal quality after the conversion of the RF (radio frequency) to data.

It is generally accepted that MER is superior method for mearsuring the quality of the raw DVB-T (Digital Video Broadcasting - Terrestrial). This DVB-T is transmitted using digital modulation in the channels available in Band III, IV and V but sharing the spectrum with the current analogue transmissions.

IF YOU WANT KNOW MORE - JUST SEARCH...

 

 

DVB-T offer:-

  • better reception of TV services than analogue system,
  • deliver higher quality and sound,
  • has no ghosting or snow,
  • offers "closed captions" subtitles, data and electronic programme guides.

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This page was last modified on 30 November 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.
 

 
 
 

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