SUMMARY CHARACTERISTICS OF THE W SATELLITES

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Introduction The W Satellites w_(iss6.3_jan03).doc - 4 - The W Satellites The W satellites are designed to provide telecommunications services primarily over Europe (W1, W2, W3, W3A and W5). and communication services over Russia and Africa (W4). W1 is designed to provide 28 channels at saturation, W2, W3 and W5 are designed to offer 24 transponders at saturation and W4 is designed to provide 31 transponders at saturation. W3A is designed to be able to offer additional capacity at 7º East as well as to back up W3. The W satellites have a minimum operational lifetime of 12 years. The launch dates for the W satellites are as follows: Satellite Launch Date W1 September 2000 W2 October 1998 W3 April 1999 W3A Second Half 2003 W4 May 2000 W5 November 2002 The main characteristics of the five satellites are given below. The W satellites are used principally for telecommunications services, mainly business services, satellite news gathering, television and radio programme exchanges, etc…. The W satellites are also used to complement Eutelsat’s offer for TV broadcast distribution services. W1 is deployed at the 10° East orbital position and W2 and W3 are located at 16° and 7° degrees East orbital positions, respectively. W3A is collocated with W3. They started to replace the EUTELSAT II series at those positions in 1998. W4 is designed to provide mainly broadcast services and is located at 36º East.
Communications Features W1 w_(iss6.3_jan03).doc - 5 - The W Satellites W1 is designed to provide 28 operational transponders at saturation for a minimum satellite lifetime of 12 years in geostationary orbit. The frequency plan is shown in Figure 1. It comprises six “B” channels, eight “D” channels, eight “DS” channels and six “F” channels. The frequency bands utilized by each of the channel groups are as follows: Channel Group Uplink Band Downlink Band B 14.25 - 14.50 GHz 10.95 - 11.20 GHz D, DS 13.75 - 14.00 GHz 11.45 - 11.70 GHz F 14.00 - 14.25 GHz 12.50 - 12.75 GHz The usable bandwidth of each communications channel is as follows: - 72 MHz for the B and F channels - 62 MHz for Channels D3, D4, D3S and D4S - 54 MHz for Channels D5 to D8 and D5S to D8S - 40 MHz for Channels D1, D2, D1S and D2S There are ten channel frequencies on both the uplink and the downlink, each of which is re-used within the fixed coverage by means of linear orthogonal polarization. Thus there are twenty channels connected to the fixed coverage on both the uplink and the downlink (the B, D and F channels). Figures 2 and 3 show the fixed receive and transmit coverages, respectively, from 10º East Additionally, eight channels (four channel frequencies) are re-used by employing spatial isolation between the steerable coverage and the fixed coverage. Thus there are eight channels (the DS channels) connected to the steerable coverage on both the uplink and the downlink. The centre of the steerable beam can be moved to any point on the visible earth. Also, the orientation of the elliptical beam can be rotated by up to ± 90º. Figure 4 and 5 show the actual receive and transmit coverage, respectively, of the W1 single steerable beam. Flexible cross-connection between the fixed and steerable coverages is provided for Channels D1, D3, D5, D7 and D1S, D3S, D5S, D7S as follows:
Page 1 and 2: SUMMARY CHARACTERISTICS OF THE W SA
Page 3: The W Satellites FIGURE 34. ILLUSTR
Page 7 and 8: W2 w_(iss6.3_jan03).doc - 7 - The W
Page 9 and 10: W4 w_(iss6.3_jan03).doc - 9 - The W
Page 11 and 12: Beacons w_(iss6.3_jan03).doc - 11 -
Page 13 and 14: w_(iss6.3_jan03).doc - 13 - The W S
Page 15 and 16: 10.95 GHz 11.20 GHz 11.45 GHz 11.70
Page 17 and 18: 45 dBW 38 dBW 45 dBW 48 dBW 47 dBW
Page 21 and 22: +5 dB/K +4 dB/K 0 dB/K +2 dB/K -5 d
Page 23 and 24: w_(iss6.3_jan03).doc - 23 - +10 dB/
Page 25 and 26: UPLINK DOWNLINK 13.00 GHz 13 021.75
Page 27 and 28: 45 dBW 48 dBW w_(iss6.3_jan03).doc
Page 29 and 30: 53 dBW 52 dBW 51 dBW 50 dBW w_(iss6
Page 31 and 32: +5 dB/K +4 dB/K -5 dB/K +3 dB/K -3
Page 33 and 34: Figure 19. The expected European B
Page 35 and 36: Figure 21. The expected European C
Page 37 and 38: Figure 23. The expected African Ser
Page 39 and 40: UPLINK 17.3 GHz 18.1 GHz DOWNLINK 1
Page 47 and 48: - 6 dB/K - 4 dB/K - 2 dB/K 0° 5°
Page 49 and 50: 0° 5° 10° 15° 20° Figure 35. E
Page 51 and 52: Figure 37 . W1 in-orbit w_(iss6.3_j
Page 53: Figure 39 . W4 Stowed for launch w_

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