Nowadays, the method to receive satellite programs is different from before. It is not just by digital machine any more, but has been developed to multimedia, which can be divided into four categories: Free digital machine, also called FTA, which can only receive free programs but cannot receive encoded channels; Card machine; Computer card, which is to watch satellite TV with computer; Module machine, one of card machines, has external module. If you just want to watch free channels, it will be convenient to use the ordinary digital machine with low price.
An FTA digital machine with top quality often owns the following functions: S terminal video output(Image resolution can reach 500 lines, but AV output can only reach 400 lines, and RF output can just reach 350 lines); Installation help menu( There must be signal strength and signal quality instructions, which is necessary for personal adjusting; Audio part can decode two layers of accompany sound, and left and right channel can switch freely; Receiving all the programs without system halted; The symbol rate should be 2-45Mbps; P/N system compatibility;0/22KHz switch; 0/12V; DiSEqC switch(namely so-called four-in-one-out switch); PID; It can delete the programs not required or not preferred and move the arrangement of channels in receiver at will; Low threshold value. For cable television dealers, we should consider the broad voltage support to adapt different areas; the electrical specification should be stable and not lead to IRD damage because of long time. If you want to use digital machine, just input the local frequency, down converter frequency, symbol rate and polarization mode follows the guide of menu.