Page 271 - Satellite Communications, Fourth Edition

The Earth Segment 251

8.2. Explain what is meant by polarization interleaving. On a frequency axis,
draw to scale the channel allocations for the 32 TV channels in the Ku band,
showing how polarization interleaving is used in this.
8.3. Why is it desirable to downconvert the satellite TV signal received at the
antenna?

8.4. Explain why the LNA in a satellite receiving system is placed at the
antenna end of the feeder cable.

8.5. With the aid of a block schematic, briefly describe the functioning of the
indoor receiving unit of a satellite TV/FM receiving system intended for home
reception.
8.6. In most satellite TV receivers the first IF band is converted to a second,
fixed IF. Why is this second frequency conversion required?
8.7. For the standard home television set to function in a satellite TV/FM
receiving system, a demodulator/remodulator unit is needed. Explain why.
8.8. Describe and compare the MATV and the CATV systems.

8.9. Explain what is meant by the term redundant earth station.

8.10. With the aid of a block schematic, describe the functioning of a transmit-
receive earth station used for telephone traffic. Describe a multidestination
carrier.

References
Huck, R. W., and J. W. B. Day. 1979. “Experience in Satellite Broadcasting Applications
with CTS/HERMES.” XIth International TV Symposium, Montreux, 27 May–1 June.
INTELSAT. 1982. “Standard A Performance Characteristics of Earth Stations in the
INTELSAT IV, IVA, and V Systems.” BG-28-72E M/6/77.
Orbit, 2005, at http://orbitmagazine.com/
Satellite Theater systems, 2005, at http://www.satellitetheater.com/