Prelim 4

Question 1

A form of amplitude modulation
in which the carrier is transmitted at full power but only one of the
sidebands is transmitted.

Answer 1

AM Single-sideband Full Carrier

SSBFC

Question 2

A form of amplitude modulation

in which the carrier is totally suppressed and one of the sidebands removed.

Answer 2

AM Single-sideband Suppressed

Carrier ( SSBSC )

Question 3

A form of amplitude modulation
in which one sideband is totally removed and the carrier voltage is reduced
to approximately 10% of its unmodulated amplitude. Sometimes called
single-sideband reinserted carrier.

Answer 3

AM Single-sideband Reduced

Carrier ( SSBRC )

Question 4

It is the reinserted carrier in

SSBRC for demodulation purposes.

Answer 4

Pilot Carrier

Question 5

A form of amplitude modulation
in which a single carrier frequency is independently modulated by two
different modulating signals.

Answer 5

AM Independent Sideband ( ISB )

Question 6

A form of amplitude modulation
in which the carrier and one complete sideband are transmitted, but only part
of the second sideband is transmitted.

Answer 6

AM Vestigial Sideband ( VSB )

Question 7

Are obvious advantages of
single-sideband suppressed- and reduced- carrier transmission over
conventional double- sideband full-carrier transmission?

Answer 7

Bandwidth Conservation and

Power Efficiency

Question 8

This ratio determines the

degree of intelligibility of a received signal.

Answer 8

Signal-to-Noise Ratio

Question 9

With double-sideband
transmission, the two sidebands and carrier may propagate through the
transmission media by different paths and therefore, experience different
transmission impairments. This condition is called ________.

Answer 9

Selective Fading

Question 10

A condition in double-sideband

transmission where one sideband is significantly attenuated.

Answer 10

Sideband Fading

Question 11

A form of selective fading
where there is a reduction of the carrier level of a 100%-modulated wave that
will make the carrier voltage less than the vector sum of the two sidebands.

Answer 11

Carrier-Amplitude Fading

Question 12

A condition where the relative
positions of the carrier and sideband vectors of the received signal change,
causing a decided change in the shape of the envelope, causing a severely
distorted demodulated signal.

Answer 12

Carrier or Sideband Phase Shift

Question 13

A product modulator where the

output signal is the product of the modulating signal and the carrier.

Answer 13

AM Modulator

Question 14

Modulator circuits that

inherently remove the carrier during the modulation process.

Answer 14

DSBSC Modulators

Question 15

A circuit that produces a

double-sideband suppressed-carrier signal.

Answer 15

Balanced Modulator

Question 16

The circuit where the carrier

is reinserted.

Answer 16

Linear Summer

Question 17

The process of combining
transmissions from more than one source and transmitting them over a common
facility, such as metallic or optical fiber cable or a radio-frequency
channel.

Answer 17

Multiplexing

Question 18

A transmission that can be used
to combine hundreds or even thousands of narrowband channels into single,
composite wideband channel without the channels interfering with each other.

Answer 18

Single-Sideband

Suppressed-Carrier Transmission

Question 19

An SSB transmission wherein the carrier is suppressed

Answer 19

Single-Sideband

Suppressed-Carrier Transmission

Question 20

Single-sideband transmitters

are rated in ________ and ________.

Answer 20

Peak Envelope Power ( PEP )

& Peak Envelope Voltage ( PEV )

Question 21

4 ADVANTAGES OF SINGLE-SIDEBAND TRANSMISSION

Answer 21

Power conservation
Bandwidth conservation
Selective fading
Noise reduction

Question 22

2 DISADVANTAGES OF SINGLE-SIDEBAND TRANSMISSION

Answer 22

Complex receivers

Tuning difficulties

Question 23

Types of single-sideband

filters.

Answer 23

Crystal Lattice, Ceramic,

Mechanical, Saw Filters

Question 24

A mechanically resonant
transducer that receives electrical energy, converts it to mechanical
vibrations, and then converts the vibrations back to electrical energy at its
output.

Answer 24

Mechanical Filter

Question 25

Filters that use acoustic
energy rather than electro-mechanical energy to provide excellent performance
for precise bandpass filtering.

Answer 25

Surface Acoustic Wave Filters