Q. If the earth station downlink signal received is at fₛ = 4.08 GHz, what first stage local-oscillator frequency fₗₒ is needed to achieve IF of 770 MHz?

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Q. Which of the following amplifiers is used in the transmitter substation?

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Q. Which part of the transmitter subsystem modulates the baseband signal?

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Q. In digital systems, analog signals are first digitized with PCM converters before modulation.

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Q. In RF tuning, _________ provides the final up conversion to the microwave frequency?

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Q. When individual up converters are used to modulate a channel, what is used to combine them into final signal?

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Q. What is the primary use of communication satellites?

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Q. Which of the following is not a reason for redistributing TV signals through satellites rather than skywaves or spacewaves?

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Q. What type of satellite TV service uses compressed data transmission to beam signals directly to every home?

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Q. Which frequency band does the direct broadcast satellite system use?

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Q. What technique does DSP use to double the number of channels by using helical antennas?

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Q. What is the number of satellites present in the Iridium system?

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Q. Which frequency band is used for connecting the satellite system with the public switched telephone network?

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Q. What provides the sufficient drive to the final power amplifier?

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