CT3 Cable Theory and Terms 16

Question 1

Radio Wave is

Answer 1

An electromagnetic wave that has been produced by a transmitter

Question 2

RF is

Answer 2

an electromagnetic wave that generally falls in the frequency range of 3 kHz to 300 GHz

Question 3

MHz (Megahertz) Equal to

Answer 3

one million Hertz. Video Signal Bandwidth is typically expressed in MHz

Question 4

Frequency

Answer 4

The number of times per second that a signal fluctuates

Question 5

Spectrum

Answer 5

a range of wavelengths of electromagnetic emission

Question 6

Attenuation

Answer 6

The difference between transmitted and received power resulting from the loss through equipment, lines,
or other transmission devices. usually expressed in decibels.

Question 7

5 factors of attenuation

Answer 7

Length of cable, size of the center conductor, type of dielectric, temperature, frequency.

Question 8

dielectric

Answer 8

The insulating material separating two conductors such as that between the center conductor and sheath in coaxial cable

Question 9

When coaxial cable heats up its attenuation…

Answer 9

increases

Question 10

tap

Answer 10

a passive cable device that electrically siphons off a portion of signal from a main distribution line or feeder.

Question 11

Signal Level Meter (SLM)

Answer 11

a frequency selective receiver capable of tuning in a desired frequency with a meter showing the strength of the input voltage and the frequency.

Question 12

dB

Answer 12

relative signal level. it refers to the comparison of 2 or more signal levels

Question 13

Gain

Answer 13

Is the measure of the ability of a circuit (often an amplifier) to increase the power or the amplitude of a signal from the input to the output

Question 14

dBmV

Answer 14

an absolute signal level that describes the amount of the signal at a specific location in the system.