Elec

Front 1

process of inputing low frequency signal on a high frequency carrier signal varying the radio frequency

Back 1

MODULATION

Front 2

The amplitude of a carrier varies depending on the info signal

Back 2

Amplitude modulation

Front 3

What year was AM made

Back 3

1870

Front 4

KHZ of AM?

Back 4

535 - 1705 KHZ

Front 5

what signal bounce off ionosphere

Back 5

Am signals

Front 6

What has larger distance? AM or FM

Back 6

AM

Front 7

Frequency of the carrier wave is changed

Back 7

Frequency modulation

Front 8

Who made FM

Back 8

Edwin Armstrong

Front 9

What has a larger bandwidth? Am or Fm

Back 9

FM

Front 10

What year was FM made

Back 10

1930

Front 11

Phase of the carrier is altered according to frequency of the message signal

Back 11

Phase Modulation

Front 12

Sending info over long distances as low frequency

Back 12

Modulation

Front 13

Receives info thru modulation, the receiving end

Back 13

Demodulation

Front 14

Uses discrete signal for modulating carrier wave

Back 14

Digital Modulation

Front 15

What is PSK?

Back 15

Phase Shift Keying

Front 16

What is FSK

Back 16

Frequency Shift Keying

Front 17

What is ASK

Back 17

Amplitude Shift Keying

Front 18

What is QAM

Back 18

Quadrature Amplitude Modulation

Front 19

Device that recovers info of interest which is contained in a modulated wave

Back 19

Detector

Front 20

Updated form of detector used for extracting original info from a modulated carrier wave

Back 20

Demodulator

Front 21

Converts a low power radio frequency signal to higher power signal

Back 21

RF amplifier

Front 22

meaning of the acronym of RADAR

Back 22

radio detection and ranging

Front 23

System that uses radio waves to detect and to fix the postion of target

Back 23

RADAR

Front 24

what is the principle of radar

Back 24

Principal of radio echoes

Front 25

To locate target what antenna do u use

Back 25

Directional Antenna

Front 26

what are the 2 parts of transmitting system

Back 26

Transmitter and pulser

Front 27

Two parts of receiving system

Back 27

Receiver, indicator

Front 28

Single antenna used for both achieved using

Back 28

RF Switch

Front 29

What do u call the switching arrangements

Back 29

Duplexer

Front 30

What is a cathode ray tube

Back 30

Indicator

Front 31

What is the meaning of LASER

Back 31

Light Amplification by Stimulated Emission of Radiation

Front 32

Device that emits light through a process of optical amplification

Back 32

LASER

Front 33

Electrons in the ground state absorb energy from photons to jump into higher energy level

Back 33

Absorption of Radiation

Front 34

If energy is orbiting close to nucleus its energy is

Back 34

Lower energy

Front 35

Electron jumped to ______ after absorbing photon

Back 35

Excited state

Front 36

Process by which electrons in the excited state returns to ground state by emiting photons

Back 36

Spontaneous Emission

Front 37

How long is the lifetime of excited electrons

Back 37

8-10 secs

Front 38

Incident photon interacts with excoted electron and forces it to return to ground state

Back 38

Stimulated Emission

Front 39

Is the stimulated emission artificial or natural process

Back 39

Artificial

Front 40

Photo sensitive transisitor receives laser from LED transmitter

Back 40

T3