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One possible arrangement for a master antenna TV (MATV) system.
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8.4 Community Antenna TV System The CATV system employs a single outdoor unit, with separate feeds available for each sense of polarization, like the MATV system, so that all channels are made available simultaneously at the indoor receiver. Instead of having a separate receiver for each user, all the carriers are demodulated in a common receiver-filter system, as shown in Fig. 8.3. The channels are then combined into a standard multiplexed signal for transmission over cable to the subscribers. In remote areas where a cable distribution system may not be installed, the signal can be rebroadcast from a low-power VHF TV transmitter. Figure 8.4 shows a remote TV station which employs an
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Figure 8.3 One possible arrangement for the indoor unit of a community antenna TV (CATV) system.
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8-m (26.2-ft) antenna for reception of the satellite TV signal in the C band. With the CATV system, local programming material also may be distributed to subscribers, an option which is not permitted in the MATV system.
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Remote television station. (Courtesy of Telesat Canada, 1983.)
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8.5 Transmit-Receive Earth Stations In the previous sections, receive-only TV stations are described. Obviously, somewhere a transmit station must complete the uplink to the satellite. In some situations, a transmit-only station is required, for example, in relaying TV signals to the remote TVRO stations already described. Transmit-receive stations provide both functions and are required for telecommunications traffic generally, including network TV. The uplink facilities for digital TV are highly specialized and are covered in Chap. 16. The basic elements for a redundant earth station are shown in Fig. 8.5. As mentioned in connection with transponders in Sec. 7.7.1, redundancy means that certain units are duplicated. A duplicate, or redundant, unit is automatically switched into a circuit to replace a corresponding unit that has failed. Redundant units are shown by dashed lines in Fig. 8.5. The block diagram is shown in more detail in Fig. 8.6, where, for clarity, redundant units are not shown. Starting at the bottom of the diagram, the first block shows the interconnection equipment required between satellite station and the terrestrial network. For the purpose of explanation, telephone traffic will be assumed. This may consist of a number of telephone channels in a multiplexed format. Multiplexing is a method of grouping telephone channels together, usually in basic groups of 12, without mutual interference. It is described in detail in Chaps. 9 and 10. It may be that groupings different from those used in the terrestrial network are required for satellite transmission, and the next block shows the multiplexing equipment in which the reformatting is carried out. Following along the transmit chain, the multiplexed signal is modulated onto a carrier wave at an intermediate frequency, usually 70 MHz. Parallel IF stages are required, one for each microwave carrier to be transmitted. After amplification at the 70-MHz IF, the modulated signal is then upconverted to the required microwave carrier frequency. A number of carriers may be transmitted simultaneously, and although these are at different frequencies they are generally specified by their nominal frequency, for example, as 6-GHz or 14-GHz carriers. It should be noted that the individual carriers may be multidestination carriers. This means that they carry traffic destined for different stations. For example, as part of its load, a microwave carrier may have telephone traffic for Boston and New York. The same carrier is received at both places, and the designated traffic sorted out by filters at the receiving earth station. Referring again to the block diagram of Fig. 8.6, after passing through the upconverters, the carriers are combined, and the resulting wideband signal is amplified. The wideband power signal is fed to the antenna
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Basic elements of a redundant earth station. (Courtesy of Telesat Canada, 1983.)
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