E7E01

Which of the following can be used to generate FM-phone emissions?

1. A reactance modulator on the oscillator

E7E02

What is the function of a reactance modulator?

1. To produce PM signals by using an electrically variable inductance or capacitance

E7E03

What is the fundamental principle of a phase modulator?

1. It varies the tuning of an amplifier tank circuit to produce PM signals

E7E04

What is one way a single-sideband phone signal can be generated?

1. By using a balanced modulator followed by a filter

E7E05

What circuit is added to an FM transmitter to proportionally attenuate the lower audio frequencies?

1. A pre-emphasis network

E7E06

What circuit is added to an FM receiver to restore attenuated lower audio frequencies?

1. A de-emphasis network

E7E07

What is one result of the process of mixing two signals?

1. The creation of new signals at the sum and difference frequencies

E7E08

What are the principal frequencies that appear at the output of a mixer circuit?

1. The original frequencies, and the sum and difference frequencies

E7E09

What occurs when an excessive amount of signal energy reaches a mixer circuit?

1. Spurious mixer products are generated

E7E10

What is the process of detection?

1. The recovery of information from a modulated RF signal

E7E11

How does a diode detector function?

1. By rectification and filtering of RF signals

E7E12

Which of the following types of detector is well suited for demodulating SSB signals?

1. Product detector

E7E13

What is a frequency discriminator?

1. A circuit for detecting FM signals

E7E14

Which of the following describes a common means of generating a SSB signal when using digital signal processing?

1. The phasing or quadrature method

E7E15

What is meant by “direct conversion” when referring to a software defined receiver?

1. Incoming RF is mixed to “baseband” for analog-to-digital conversion and subsequent processing

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