Customer Antenna Signal or Reception testing by AETV Systems
What if I have a problem with my digital TV reception?
With digital television it can be difficult to differentiate between reception problems related to your installed television antenna, and those related to interference from nearby sources.
A large proportion of reception problems are caused by inadequate or faulty reception equipment such as antennas, antenna position, decaying mast head amplifiers(boosters) or cables. Most problems can be resolved with the help of an experienced local AETV Systems antenna installer.
In some cases, reception may be also affected by 'impulse noise' interference. Impulse noise can be generated by the use of light switches, hair dryers, car engines, a number of other domestic appliances, in some cases high voltage power lines and recently by the introduction of some LED products.
AETV Systems As endorsed antenna installer can provide an onsite survey of your antenna system using the latest approved test equipment. Reception testing Made easy our equipment can scan your antennas signal strength, MER, BER and much more.
So why hesitate call AETV Systems today and have your reception tested.
The Modulation error ratio or MER is a measure used to quantify the performance of a digital radio (or digital TV) transmitter or receiver in a communications system using digital modulation (such as QAM). Transmitted MER can be measured by specialised equipment - which demodulates the received signal in a similar way to how a real radio demodulator does it. Demodulated and detected signal can be used as a reasonably reliable estimate for the ideal transmitted signal in MER calculation.
The decibel (dB) is a logarithmic unit that expresses the ratio of two values of a physical quantity - often power or intensity.
Unlike analog TV signals - which can be viewed down to weak signal strengths or in corrupted conditions DTV signal's pictures and sound will either be perfect - in the process of breaking up or non-existent. The penalty for the potential of obtaining perfect pictures and sound all the time is that DTTB reception exhibits a very rapid change from being excellent to disappearing. This phenomenon in general is referred to as the digital cliff edge or threshold App 47dB.
Bit Error Ratio is a measurement of signal quality after conversion of the "RF" to data ready to convert to pictures and sound etc hence BER testing is the first objective measurement directly related to whether pictures or sound could be received uncorrupted. Errors in the data - or bit errors - can be tolerated up to a particular level without an effect on pictures or sound due to the techniques employed which are simply called error correction.The error correction has two stages - namely "Viterbi" and "Reed Solomon" (RS). BER measurement after Viterbi or "post-Viterbi" should be monitored.A post-Viterbi BER of worse than "2E-4" (2 x 10-4) will exceed the ability of the RS (Reed- Solomon) error correction and may result in picture and sound corruption. To provide for a sufficiently robust reception - a post-Viterbi BER of better than "2E-6" is required.