Page 251 - Satellite Communications, Fourth Edition

The Space Segment 231

version of the Hughes 601 satellite illustrated in Fig. 7.2. The antenna
footprints have been expanded to cover the whole American continent.
In the Ku-band coverage area it will be possible to receive direct-to-
home (DTH) television broadcasts on antennas 60 cm diameter or less.
SATMEX-5 occupies the 116.8°W slot on the geostationary orbit.

7.10 Anik-Satellites
The Anik series of satellites are designed to provide communications
services in Canada as well as cross-border services with the United
States. Early satellites such as Anik C and D were both Boeing 376
models. Anik-E was the first of the body-stabilized satellites used in the
series, a dual-band satellite which had an equivalent capacity of 56 tel-
evision channels, or more than 50,000 telephone circuits. Attitude con-
trol was of the momentum-bias, three-axes-stabilized type, and solar
sails were used to provide power, the capacity being 3450 W at summer
solstice and 3700 W at vernal equinox. Four NiH batteries provided
2
power during eclipse. Although the Anik-E has been superseded by the
Anik-F series, the Anik-E configuration as shown in Fig. 7.26 provides

Figure 7.26 Anik-E spacecraft configuration. (Courtesy of Telesat Canada.)