Communication Electronics N6 — Document

April 2019 — N6 — Communication Electronics

N6 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 43 items found 📚 1 topics

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Q1— Section header —

1.1Design a T section filter network that will eliminate all frequencies between the ranges of 7,5 kHz and 10 kHz for a transmission line of 600 ohm

1.2Draw neat, labelled graph of attenuation versus frequency for each of the following:

1.2.1and stop filter

1.2.2

1.3A high pass section filter with a cut off frequency of 3 kHz

Q2— Section header —

2.1Determine the values of Z , Z and Z in the attenuator network in FIGURE 1 if

2.2Impedance matching and possible attenuation are important concepts in communication systems. A certain device with an output impedance of 350 ohms has to be matched to a device with an input imp

2.3Draw the following fully labelled balanced attenuator networks:

2.3.1type

2.3.2type

2.3.316

Q3— Section header —

3.1Explain how the reactive component can be t uned out of a transmission line and use a simple sketch to support your description. (4\

3.2Give a brief description of how Smith chart can be used to obtain the SWR on a transmission line. (5

3.3The propagation constant of a transmission line is + j

3.3.1Name the quantity that is represented by and the unit in which it

3.3.2Name the quantity that is represented by and the unit in which

3.4Determine the open circuit impedance of a transmission line for the following data: = 600 ohms S/C

Q4— Section header —

4.1An FM receiver has an input resistance of 5 kilo ohms and an equivalent resistance of 7,2 kilo ohms. The amplifier has a gain of 20 which is developed

4.1.1RMS noise voltage generated at 25 and a bandwidth of 20 kHz

4.1.2

4.2Draw the equivalent input circuit for noise of the amplifier in FIGURE 2 FIGURE 2 (4\

4.3

Q5— Section header —

5.1Draw a neat, labelled circuit diagram of a lass C modulator using an NPN transistor. Indicate ALL the relevant waveforms. (7\

5.2Discuss the full operation of the lass

Q5— Section header —

5.3Define each of the following with reference to modulation:

5.3.1PAM

5.3.2PPM

5.3.3PWM (3 2\ (6 [18]18

Q6— Section header —

6.1Define bandwidth of an antenna. (2\

6.2A satellite transmitter operating at a frequency of 950 MHz radiates 60 kW of RF power and is used to determine the distance of satellite 150 km away with a surface area of 30 m . The transmitter and receiver antennae have

6.2.1Field strength at the satellite (3\

6.2.2Power density at the satellite (2\

6.2.3Reflected power from the satellite (2\

6.2.4Field strength at the receiver (2\

6.2.5Power density at the receiver (2\

6.2.6Received power at the receiver (3\ [16] TOTAL: 100 808024616

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections17 + 16 + 16 + 17 + 18 + 16 = 100 marks

Paper information

TitleDocument

SubjectCommunication Electronics

LevelN6

Document typeQuestion paper

Year2019

MonthApril

Pages11

Downloads3

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,751

About Communication Electronics examination preparation

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How to use this resource for revision

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For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

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A practical revision approach

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Archived on8 September 2026

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