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1
Q

Trans and reception of information signal thru electronic device

A

Electronic Comms

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2
Q

Converts into signal that is suitable to channel
Must be properly modulated

A

Transmitter

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3
Q

Can be guided or unduided

A

Channel

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4
Q

T.p wire
Coaxial cable} uses electrical signal
Optical fiber- uses light energy

A

Guided medi

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5
Q

Uses free space, e.m wave

A

Unguided media

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6
Q

Categories of Electronic communications

A
  1. One way/ simplex & Two way/ duplex
  2. Analog & Digital
  3. Baseband & Broadband
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7
Q

Represents the principal reason for using analog to analog modulation

A

Because Higher frequency is needed for effective transmission

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8
Q

Bandwidth required for a modulated carrier depends on

A

Baseband frequency range

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9
Q

Bandwidth of analog signal contains most of its power ( or energy)

A

Effective bandwidth

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10
Q

Range of frequency allow to pass thru without distortion

A

Channel bandwidth

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11
Q

Value

A

Absolute bandwidth

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12
Q

No Intersymbol Interference, flat fading

A

Coherence bandwidth

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13
Q

Sending the signak at high frequencies

A

Passband transmission

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14
Q

For low frequency

A

Baseband transmission

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15
Q

Process, characteristics of wVe are varied in accordance with a message

A

Modulation

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16
Q

Rate of change
Number of cycles taken by EM waves in one second

A

Frequency

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17
Q

Distance traveled bt EM wave in one cycle

A

Wavelength

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18
Q

Time taken by EM wave to complete one cycle

A

Period

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19
Q

Voice grade channel

A

300Hz - 3,400Hz

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20
Q

Voice channel bandwidth

A

4Hz

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21
Q

Two or more signals share a commnon channel

Used to efficiently transfer signal from one point to another

A

Multiplexing

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22
Q

m = 1

A

Ideal

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23
Q

m > 1

A

Over modulation

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24
Q

m &laquo_space;1

A

Under modulation

25
Q

m < 1

A

Practical

26
Q

The power in the sidebands in AM system depends on

A

Modulation index

27
Q

Application of a mixer of a signal from a local oscillator at a freq. below that of the incoming signal

A

Low side injection

28
Q

Modulation as stage earlier than final stage

Uses linear amplitude ( A, B, AB)

A

Low-level modulation

29
Q

Modulation at final stage

Uses class C amplitude due to high efficiency

A

High-level modulation

30
Q

It suppress carrier

A

Balanced modulator

31
Q

Not used bec. it’s difficult to demodulate
It requires sync for both phase and frequency

A

DSBSC

32
Q

Ssb generator types

A

Filter method- most used
Phasing method-cuses 2BM & 2 phase shifter
Third (weaver)- combines 1 & 2

33
Q

Advantages of SSB over AM (DSBFC)

A

Spectrum utilization
Less bandwidth
Less power
Less fading

34
Q

In SSB____ is simply the DC input power of the final ampli. stage at the instant voice envelope peak

A

Peak envelope power (PEP)

35
Q

Double sideband suppressed carrier modulation requires the carrier to be reinserted at the receiver with the correct phase and frequency. Single sideband suppressed carrier modulation only requires the ____ of the inserted carrier to be correct

A

Frequency

36
Q

Additional side freq. produced by overmodulation or distortion in any AM system is known as

A

Sideband splatter

37
Q

Emission outside the assigned BW

A

Spurious signal

38
Q

In transmitter system, the absence of spurious signals refers to

A

Spatial purity

39
Q

Two main characteristics of receiver

A

Sen-sel

40
Q

Ability of the receiver to process every weak signal (SNR)

A

Sensitivity

41
Q

Ability of the receiver to reject unwanted freq.

A

Selectivity

42
Q

Faithful reproduction of signal

A

Fidelity

43
Q

The greater the number of tuned circuits, ____

A

The higher the Q

44
Q

The narrower the passband, ____

A

The higher the selectivity

45
Q

PM
Carrier freq is proportional to both ____ and ____

A

Amplitude and Freq

46
Q

PM
Max. phase shift and max carrier freq occurs at ___ crossing point of modulating signal

A

Zero

47
Q

FM
Carrier freq. is propotional only to ____ of modulating signal

A

Amplitude

48
Q

As freq. mod is varied,

A

m is also varied

49
Q

In phase mod, the carrier freq. deviation is propotional to ____

A

Both modulating freq and amplitude of the modulating signal

50
Q

When the modulating signam amplitude crosses zero, the phase shift and freq dev in a phase mod ____

A

Are at maximum

51
Q

When the modulating freq is changed the PM mod index ____

A

Remain constant

52
Q

Advantages of FM over AM

A

Noise immunity
Capture effect
Transmitter efficiency

53
Q

Tendency of an FM receiver to receive the strongest signal and reject others

A

Capture effect

54
Q

Ability of receiver to reject unwanted freq

A

Selectivity

55
Q

Ability of receiver to still process weak signal

A

Sensitivity

56
Q

In adjacent channel, where the sensitivity of one channel is reduced by another (decentralisation(

A

Blocking

57
Q

A pre-emphasis circuit provides extra noise immunity by

A

Amplifying the higher audio freq.

58
Q

Due to practical reason, bandwidth of FM trans is generally limited by government regulations by putting limits on:

A

Max freq dev and max mod freq

EST (2 decks)

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