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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. 8.9. Describe and compare the MATV and the CATV systems. Explain what is meant by the term redundant earth station.
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8.10. With the aid of a block schematic, describe the functioning of a transmitreceive earth station used for telephone traffic. Describe a multidestination carrier.
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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/
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9.1 Introduction Analog signals are electrical replicas of the original signals such as audio and video. Baseband signals are those signals which occupy the lowest, or base, band of frequencies, in the frequency spectrum used by the telecommunications network. A baseband signal may consist of one or more information signals. For example, a number of analog telephony signals may be combined into one baseband signal by the process known as frequency-division multiplexing (FDM). Other common types of baseband signals are the multiplexed video and audio signals which originate in the TV studio. In forming the multiplexed baseband signals, the information signals are modulated onto subcarriers. This modulation step must be distinguished from the modulation process, which places the multiplexed signal onto the microwave carrier for transmission to the satellite. In this chapter, the characteristics of the more common types of analog baseband signals are described, along with representative methods of analog modulation. 9.2 The Telephone Channel Natural speech, including that of female and male voices, covers a frequency range of about 80 to 8000 Hz. The somewhat unnatural quality associated with telephone speech results from the fact that a considerably smaller band of frequencies is used for normal telephone transmission. The range of 300 to 3400 Hz is accepted internationally as the standard for telephone quality speech, and this is termed the speech baseband. In practice, some variations occur in the basebands used by different telephone companies. The telephone channel is often referred
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to as a voice frequency (VF) channel, and in this book this will be taken to mean the frequency range of 300 to 3400 Hz. There are good reasons for limiting the frequency range. Noise, which covers a very wide frequency spectrum, is reduced by reducing the bandwidth. Also, reducing the bandwidth allows more telephone channels to be carried over a given type of circuit, as will be described in Sec. 9.4. The signal levels encountered within telephone networks vary considerably. Audio signal levels are often measured in volume units (VU). For a sinusoidal signal within the VF range, 0 VU corresponds to 1 mW of power, or 0 dBm. No simple relationship exists between VU and power for speech signals, but as a rough guide, the power level in dBm of normal speech is given by VU 1.4. As a rule of thumb, the average voice level on a telephone circuit (or mean talker level) is defined as 13 VU (see Freeman, 1981). 9.3 Single-Sideband Telephony Figure 9.1a shows how the VF baseband may be represented in the frequency domain. In some cases, the triangular representation has the small end of the triangle at 0 Hz, even though frequency components below 300 Hz actually may not be present. Also, in some cases, the upper end is set at 4 kHz to indicate allowance for a guard band, the need for which will be described later. When the telephone signal is multiplied in the time domain with a sinusoidal carrier of frequency fc, a new spectrum results, in which the original baseband appears on either side of the carrier frequency. This is illustrated in Fig. 9.1b for a carrier of 20 kHz, where the band of frequencies below the carrier is referred to as the lower sideband and the band above the carrier as the upper sideband. To avoid distortion which would occur with sideband overlap, the carrier frequency must be greater than the highest frequency in the baseband.
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Frequency-domain representation of (a) a telephone baseband signal and (b) the double-sideband suppressed carrier (DSBSC) modulated version of (a).
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