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where l is the wavelength of the signal, D is the reflector diameter, and 3-dB I is the aperture efficiency. A typical value for I is 0.55. The beamwidth is given approximately by Eq. (6.33) as > 70 l degrees D
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The ratio D/l is seen to be the key factor in these equations, the gain being directly proportional to (D/l)2 and the beamwidth inversely proportional to D/l. Hence the gain can be increased and the beamwidth made narrower by increasing the reflector size or decreasing the wavelength. In comparing C-band and Ku-band, the largest reflectors are those for the 6/4-GHz band. Comparable performance can be obtained with considerably smaller reflectors in the 14/12-GHz band. Satellites used for mobile services in the L-band employ much larger antennas (with reflector areas in the order of 100 m2 to 200 m2) as described in Chap. 17. Figure 7.22 shows the antenna subsystem of the INTELSAT VI satellite (Johnston and Thompson, 1982). This provides a good illustration of the level of complexity which has been reached in large communications satellites. The largest reflectors are for the 6/4-GHz hemisphere and zone coverages, as illustrated in Fig. 7.23. These are fed from horn arrays, and various groups of horns can be excited to produce the beam shape required. As can be seen, separate arrays are used for transmit and receive. Each array has 146 dual-polarization horns. In the 14/11-GHz band, circular reflectors are used to provide spot beams, one for east and one for west, also shown in Fig. 7.23. These beams are fully steerable. Each spot is fed by a single horn which is used for both transmit and receive. Wide beams for global coverage are produced by simple horn antennas at 6/4 GHz. These horns beam the signal directly to the earth without the use of reflectors. Also as shown in Fig. 7.22, a simple biconical dipole antenna is used for the tracking and control signals. The complete antenna platform and the communications payload are despun as described in Sec. 7.3 to keep the antennas pointing to their correct locations on earth. The same feed horn may be used to transmit and receive carriers with the same polarization. The transmit and receive signals are separated in a device known as a diplexer, and the separation is further aided by means of frequency filtering. Polarization discrimination also may be used to separate the transmit and receive signals using the same feed horn. For example, the horn may be used to transmit horizontally polarized waves in the downlink frequency band, while simultaneously receiving vertically polarized waves in the uplink frequency
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Figure 7.22 The antenna subsystem for the INTELSAT VI satellite. (Courtesy of Johnston
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and Thompson, 1982, with permission.)
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band. The polarization separation takes place in a device known as an orthocoupler, or orthogonal mode transducer (OMT). Separate horns also may be used for the transmit and receive functions, with both horns using the same reflector. 7.9 Morelos and Satmex 5 Figure 7.24 shows the communications subsystem of the Mexican satellite Morelos. Two such satellites were launched, Morelos A in June and Morelos B in November 1985. The satellites are from the Hughes 376
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Figure 7.23 INTELSAT V Atlantic satellite transmit capabilities. (Note: The 14/11-GHz spot beams are steerable and may be moved to meet traffic requirements as they develop.) (Courtesy of Intelsat Document BG-28-72E M/6/77, with permission.)
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spacecraft series. These satellites had a predicted mission life of 9 years, Morelos-A being retired in 1994, and Morelos-B was scheduled to remain in operation until 1998. The payload carried on Morelos illustrates what is referred to as a hybrid, or dual-band, payload because it carried C-band and K-band transponders. In the C band, Morelos provided 12 narrowband channels, each 36-MHz wide, and 6 wideband channels, each 72-MHz wide. In the K band it provided four channels, each 108MHz wide. The 36-MHz channels used 7-W TWTAs with 14-for-12 redundancy. This method of stating redundancy simply means that 12 redundant units are available for 14 in-service units. The 72-MHz channels used 10.5-W TWTAs with 8-for-6 redundancy. The four K-band repeaters used six 20-W TWTAs with 6-for-4 redundancy. The receivers were solid-state designs, with a 4-for-2 redundancy for the C-band receivers and 2-for-1 redundancy for the K-band receivers.
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