E8B01

What is the term for the ratio between the frequency deviation of an RF carrier wave, and the modulating frequency of its corresponding FM-phone signal?

  1. Modulation index

E8B02

How does the modulation index of a phase-modulated emission vary with RF carrier frequency (the modulated frequency)?

  1. It does not depend on the RF carrier frequency

E8B03

What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency, when the modulating frequency is 1000 Hz?

  1. 3

E8B04

What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2-kHz modulating frequency?

  1. 3

E8B05

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz and accepting a maximum modulation rate of 3 kHz?

  1. 1.67

E8B06

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation frequency of 3.5 kHz?

  1. 2.14

E8B07

When using a pulse-width modulation system, why is the transmitter's peak power greater than its average power?

  1. The signal duty cycle is less than 100%

E8B08

What parameter does the modulating signal vary in a pulse-position modulation system?

  1. The time at which each pulse occurs

E8B09

How are the pulses of a pulse-modulated signal usually transmitted?

  1. A pulse of relatively short duration is sent; a relatively long period of time separates each pulse

E8B10

What is meant by deviation ratio?

  1. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency

E8B11

Which of these methods can be used to combine several separate analog information streams into a single analog radio frequency signal?

  1. Frequency division multiplexing

E8B12

Which of the following describes frequency division multiplexing?

  1. Two or more information streams are merged into a "baseband", which then modulates the transmitter

E8B13

What is time division multiplexing?

  1. Two or more signals are arranged to share discrete time slots of a digital data transmission

 

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