Experimental Study on Protection Distance between Analog TV and Digital TV in Adjacent UHF Frequency Bands at Terrestrial Television

Kinupong Chomsuk, Siraphop Tooprakai, Kobchai Dejhan


Office of the National Broadcasting and Telecommunication Commission (NBTC), the Thai governmental organization decided to launch digital broadcasting. The implementation has to carry by the broadcasting license; the digital transmission testing has to carry on broadcasting on channel 30 while the analog television has to broadcast on channel 29. The adjacent channel interference must occur between analog television signal and digital television signal because of 20 MHz spacing between both signals.

This paper proposes the experimental study of testing in order to measure and determining the degradation caused by the analog PAL television signal interferences on the digital television signal. The previous researches have been presented since the beginning of DVB-T broadcasting at several sites by M.N. Sanchez et al. [1] and M. M. Valez et al. [2]. They carried out the laboratory tests to measure the degradation of the bit error rate (BER) caused by analog PAL TV. The variations of adjacent channel interference with regarding the distance from the base station to determine the quality of the digital signal both in town and out of town.


DTT, Digital TV, PAL, Field Strength, Adjacent, Channel Interference, Power Ratio, Bit Error Rate, Carrier to Noise ratio

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