New Profile Delay function in Promax TVExplorer ISDBT

The novelty is one of the most valued measurements by engineers working in the world of television radio frequency, the measurement of echoes in Digital Terrestrial Television networks (COFDM), also known as Profile Delay.

Promax Electronics, junto con su agente en Brasil, Proatec, introducen el nuevo Medidor de Campo TVExplorer ISDBT que ha sido presentado con gran éxito en la feria Broadcast&Cable de Sao Paulo. La novedad es una de las medidas más valoradas por los ingenieros que trabajan en el mundo de la radiofrecuencia de televisión. Se trata de la medida de ecos en las redes de Televisión Digital Terrestre (COFDM), también conocida como Profile Delay. Esta medida es imprescindible en entornos de transmisión SFN (Single Frequency Network).

In SFN networks, signals from different transmitters can reach a receiver displaced in time. Obstacles such as large buildings and mountains can also produce the same effect. Any signal from another transmitter that arrives outside the guard interval cannot be corrected by the ISDBT system and the receiver will interpret it as interference. The main effect is the reduction of the MER.

The spectrum analyzer cannot see this distortion because it occurs at the same frequency as the main signal, therefore only the echo function of the TVExplorer ISDBT tells us the signal delay time and the distance at which the interfering transmitter is located. As it is a dynamic Echo function, the antenna can be reoriented to reduce the signal that prevents reception.

The ISDBT TVExplorer with the Echo function allows technicians to identify the cause of the problem. It allows knowing the distance and direction of origin of the interfering signal and taking the measures considered appropriate to correct its effect.

More detailed information about the equipment, here, and about the phenomenon of echoes, here.