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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 86, 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.

Basic elements of a redundant earth station. (Courtesy of Telesat Canada, 1983.)

CHAPTER 1 THE VBA INTEGRATED DEVELOPMENT ENVIRONMENT (VBAIDE)

through a diplexer, which allows the antenna to handle transmit and receive signals simultaneously. The station s antenna functions in both, the transmit and receive modes, but at different frequencies. In the C band, the nominal uplink, or transmit, frequency is 6 GHz and the downlink, or receive, frequency is nominally 4 GHz. In the Ku band, the uplink frequency is nominally 14 GHz, and the downlink, 12 GHz. High-gain antennas are employed in both bands, which also means narrow antenna beams. A narrow beam is necessary to prevent interference between neighboring satellite links. In the case of C band, interference to and from terrestrial microwave

links also must be avoided Terrestrial microwave links do not operate at Ku-band frequencies In the receive branch (the right-hand side of Fig 86), the incoming wideband signal is amplified in an LNA and passed to a divider network, which separates out the individual microwave carriers These are each downconverted to an IF band and passed on to the multiplex block, where the multiplexed signals are reformatted as required by the terrestrial network It should be noted that, in general, the signal traffic flow on the receive side will differ from that on the transmit side The incoming microwave carriers will be different in number and in the amount of traffic carried, and the multiplexed output will carry telephone circuits not necessarily carried on the transmit side A number of different classes of earth stations are available, depending on the service requirements.

Traffic can be broadly classified as heavy route, medium route, and thin route In a thin-route circuit, a transponder channel (36 MHz) may be occupied by a number of single carriers, each associated with its own voice circuit This mode of operation is known as single carrier per channel (SCPC), a multiple-access mode which is discussed further in Chap 14 Antenna sizes range from 36 m (118 ft) for transportable stations up to 30 m (984 ft) for a main terminal A medium-route circuit also provides multiple access, either on the basis of frequency-division multiple access (FDMA) or time-division multiple access (TDMA), multiplexed baseband signals being carried in either case These access modes are also described in detail in Chap 14 Antenna sizes range from 30 m (894 ft) for a main station to 10 m (328 ft) for a remote station.

in the production process. To these, the rm must add such implicit costs as the wage that the entrepreneur would earn working as a manager for somebody else, the interest he would get by supplying his money capital (if any) to someone else in a similarly risky business, and the rent on his own land and buildings, if he were not using them himself. Only if the total revenue received from selling the output exceeds both its explicit and implicit costs is the rm making an economic or pure pro t.

In a 6/4-GHz heavy-route system, each satellite channel (bandwidth 36 MHz) is capable of carrying over 960 one-way voice circuits simultaneously or a single-color analog TV signal with associated audio (in some systems two analog TV signals can be accommodated) Thus the transponder channel for a heavy-route circuit carries one large-bandwidth signal, which may be TV or multiplexed telephony The antenna diameter for a heavy-route circuit is at least 30 m (984 ft) For international operation such antennas are designed to the INTELSAT specifications for a Standard A earth station (Intelsat, 1982) Figure 87 shows a photograph of a 32-m (105-ft) Standard A earth station antenna It will be appreciated that for these large antennas, which may weigh in the order of 250 tons, the foundations must be very strong and stable.

Such large diameters automatically mean very narrow beams, and therefore, any movement which would deflect the beam unduly must be avoided Where snow and ice conditions are likely to be encountered, built-in heaters are required For the antenna shown in Fig 87, deicing.

Figure 8.7 Standard-A (C-band 6/4 GHz) 32-m antenna. (Courtesy of TIW Systems, Inc., Sunnydale, CA.)