CT3 Cable Theory and Terms 16 Flashcards Preview

2016 Master > CT3 Cable Theory and Terms 16 > Flashcards

Flashcards in CT3 Cable Theory and Terms 16 Deck (14):
1

Radio Wave is

An electromagnetic wave that has been produced by a transmitter

2

RF is

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

3

MHz (Megahertz) Equal to

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

4

Frequency

The number of times per second that a signal fluctuates

5

Spectrum

a range of wavelengths of electromagnetic emission

6

Attenuation

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

7

5 factors of attenuation

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

8

dielectric

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

9

When coaxial cable heats up its attenuation...

increases

10

tap

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

11

Signal Level Meter (SLM)

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

12

dB

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

13

Gain

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

14

dBmV

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

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