Fine Tuning
I It may be necessary to do some very fine adjustments to the FEED/LNB with integrated FEED, by loosening the mounting screws slightly and rotating the assembly, in either direction, to identify positions where the signal received begins to deteriorate, mark the positions and adjust the assembly midway between the position and tighten the screws as this will be the position for maximum. signal reception. This minimises any polarisation loss. This FEED adjustment could have affected the EL setting angle slightly, and might have affected the signal, in which case do some fine adjustments for the EL setting again. Now check for signal quality on all channels of interest from the satellite. If inescapable make some final adjustments to receive the channels well. It may not be possible to receive all channels with same high quality. You will also note that if the receiver frequency is not correctly set, the colour subcarrier is the first casuality and the TV will not receive colour properly and the images could be B & W.
The sound carrier has to be correctly set in the video receiver for the particular satellite trarimission (signals, could be between 5.5 to 8 MHz for PAL). Note that some NTSC signals could have 4.43 MHz as colour subcarrier frequency. Now that the dish antenna has been aligned and you are receiving required satellite programmes you can proceed with the Control Room equipment installation and setting up and commissioning of the distribution network. These actions could go side by side as considerable time will be needed to ensure proper cable runs and mounting of the distribution devices such as splitters, line amplifiers and tap offs. Installation of CR equipment is simpler as they need not necessarily be wall mounted but could be mounted on a rack; but they need to be carefully and properly secured and connected. Testing and commissioning of the CR equipment would also be carried out as the distribution system. is getting laid. You will need to locate line amplifiers where power supply point is available closeby. Since the system must function unattended, and as there could be power supply breakdowns, it would be advisable to install suitable UPS system for the system to ensure continued system performance and customer satisfaction. Alternately the system should be manned and suitable standby power supply should be available for the CR manning person to changeover from one supply to another as needed.
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