全民拼三张下载

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                      Dual Satellite Reception

                      Concept

                      Receive AsiaSat 7 at 105.5°E and AsiaSat 5 at 100.5°E with 1 TVRO dish1

                      Benefits to Broadcasters

                      • Combined audience penetration of AsiaSat 7 and AsiaSat 5
                        • over 830 million TV households across Asia Pacific
                      • Combined channel neighbourhood of AsiaSat 7 and AsiaSat 5
                        • 440+ premier television channels
                        • multilingual bouquets of South Asian, Middle Eastern, European, Chinese and international programming
                      • Inter-satellite back up
                        • service continuity made possible by second feeds installed at receiving sites

                       

                      Benefits to Cable Headends / Receive Sites

                      • Increase channel offerings through access to multiple broadcast platforms via a single TVRO
                      • Expand subscriber base through enriching programming packages
                      • Increase revenue through enlarging subscriber base
                      • Low implementation cost to expand service packages to subscribers/viewers
                      • Allow service continuity with second feeds installed at receiving sites

                       

                      How to Retrofit Existing Single Feed TVRO?

                      Set Up Configurationd2

                      Steps

                      • Retrofit the existing C-band TVRO dish that has a single feed and LNBs pointing to either AsiaSat 7 or AsiaSat 5
                      • Install a secondary feed assembly and LNBs to the existing TVRO dish
                      • Connect the IF cable to the additional LNBs
                      • Align the secondary feed horn and optimise the additional feed position for best quality signal
                      • Rotate the secondary feed to get the right polarisation angle
                      • Once obtain the best C/N ratio, fix the LNBs at the selected position
                      • Installation of the secondary feed is complete when achieve the maximum signal levels of both satellites

                       

                      Details of Aligning the Additional Feedhorn

                      全民拼三张下载To receive more than one satellite simultaneously using one dish antenna, you need to find out two additional angles to fix the supplementary feedhorn besides the Azimuth and Elevation angles of the primary satellite. They are the "Relative Separation Angle" and "Feed Offset Angle".

                      全民拼三张下载The relative separation angle is used to align the supplementary feedhorn on the transversely displaced feed point of the secondary satellite. Feed offset angle is used to find out the position of the supplementary feedhorn.

                      Antenna Alignment

                      Imagine that there are two planes, Plane 'A' and Plane 'B', along the antenna axis. Plane 'A' is at the back of the antenna and Plane 'B' is in front of the feedhorn. If AsiaSat 5 is the primary satellite, align the dish antenna with AsiaSat 5 first. Then find out the position of the secondary satellite (i.e. AsiaSat 7) on plane 'A' and the position of the secondary feedhorn on plane 'B'. Align the secondary feedhorn with the secondary axis by connecting these two points.

                      Example

                      全民拼三张下载To receive both AsiaSat 7 and AsiaSat 5 using a 2.4m dish antenna in Hong Kong, and assuming AsiaSat 5 is the primary satellite and AsiaSat 7 the secondary satellite, the relative separation angle will be

                      5.24° H
                      2.43° V
                      feed offset angle will be -0.102m H
                      -0.047m V
                      where H is horizontal direction and V is vertical direction

                      1d2s

                       

                       

                      In the case of receiving two satellites with a single dish, the receiving gain for the secondary satellite will be lower than that of the primary satellite. In order to compensate this loss, a large antenna or signal booster may be needed.

                       

                      Monoblocks are available these days to receive two different satellites at the same time, capable of receiving both V and H-pol. These monoblocks are mostly custom manufactured according to the separation of the targeted satellites. Two examples are:

                      4 monoblocks

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