Deck 3: Understanding Radio Frequency Communications

Question 1

When mixing two signals, the highest sum and the smallest difference between the carrier frequency and the range of frequencies at the other input define two limits known as the sidebands of the frequency carrier.

Answer 1

True

Question 2

Which of the following divides the bandwidth of the frequency channel into several time slots?

A) FDMA
B) OFDM
C) CDMA
D) TDMA

Answer 2

D

Question 3

When using the same antenna for full-duplex communications, the same frequency can be used for transmitting and receiving simultaneously.

Answer 3

False

Question 4

A passband has both a minimum and maximum threshold.

Question 5

Explain multipath distortion and how it can be minimized.

Question 6

What does the Federal Communications Commission do regarding the licensing of radion frequencies?

Question 7

TDMA can carry three times the amount of data that CDMA can.

Question 8

The result of using a PN code is that ________.

A) it adds a unique address to the signal
B) it spreads the signal over a wider range of frequencies
C) it mixes the signal with the IF
D) it decodes the signal

Question 9

What is switching? What type of switching is used with telephone transmissions, and what type is used for data transmissions?

Question 10

A(n) ______ actively increases a signal's intensity or strength.

A) transmitter
B) demodulator
C) amplifier
D) antenna

Question 11

Without switching, 1,225 cables would be required to interconnect 50 telephones.

Question 12

List and discuss the advantages of standards.

Question 13

______ is a method of transmission in which the information is broken up into smaller units.

A) Error correction
B) Circuit switching
C) Electromagnetic interference
D) Packet switching

Question 14

The resulting output from the modulation process is known as the middle frequency (MF) signal.

Question 15

Each of the following is a type of RF filter except _____.

A) low-pass
B) high-pass
C) passband
D) bandpass

Question 16

A _______ transmission uses spread spectrum technology and unique spreading codes for each user.

A) CDMA
B) FDMA
C) TDMA
D) OFDM

Question 17

A(n) ______ combines two inputs to create a single output.

A) mixer
B) codex
C) filter
D) amplifier

Question 18

List and describe the three types of data flow.

Question 19

When signals are sent at frequencies that are closely grouped together, an errant signal may encroach on a close frequency, causing _______.

A) frequency conflict
B) crosstalk
C) time conflict
D) channel mixing

Question 20

________ divides the bandwidth of the frequency into several narrower frequencies. Each user then transmits using its own narrower frequency channel.

A) TDMA
B) OFDM
C) FDMA
D) CDMA