Kommunikasie Elektronika N4 — Document

April 2021 — N4 — Kommunikasie Elektronika

N4 2021 Nated Engineering

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1.10\ in die ANTWOORDBOEK neer te skryf

1.1Die impedansie van 'n seriekring by resonansie is 'n maksimum.

1.2Radiogolwe beweeg teen die spoed van klank.

1.3'n Radio antenne is algerig (' omnidireksioneel '\

1.4Die uitset van 'n loop golfbuis (' travelling wave tube '\ neem eksponensieel toe

1.5Paraboliese weerkaatser is 'n oms etter in radiokommunikasie

1.6Die funksie van 'n verhoudingsdetektor is om tussenfrekwensie ('IF'\ na klank om te skakel

1.7'n Lui spreker skakel klank om in elektromagnetiese golwe.

1.8'n Netwerk wat ontwerp is om 'n sekere frekwensieband te stop /keer , staan bekend as 'n filter.

1.9Die impedansie in enige antenne sal magnetiese en elektriese velde opstel.

1.1010

2.1Defin ieer die volgende

2.1.1Norton se stelling

2.1.2

2.2Gebruik die superposisie stelling om vas te stel wat die stroom deur weerstand R2 in die onderstaande netwerk is (7\

3.1Bereken die volgende

3.1.1Frekwensie by resonansie

3.1.2Bandw dt

3.1.3fa tor

3.1.4

1.3deur enige alternatiewe metode te gebruik. (2\ [10] 808022410

4.1Ma ak 'n netjiese skets van elk van die volgende verswakkers

4.1.1Br ug pe

4.1.2

4.2

4.3.1Teken 'n kringdiagram van 'n laedeurlaatfilter

4.3.2Teken die basiese versterking versus frekwensie grafiek vir die filter in VRAAG

4.3.1[8] VRAAG 5: MODULA SIE8

5.1Noem VIER verskillende modulasietipes wat in kommunikasienetwerke gebruik word. (4\

5.2Verduidelik DRIE voordele en DRIE nadele van amplitudemodulasie. (6\ [10] VRAAG 6: DEMODULA SIE10

6.1Teken 'n volledig benoemde blokdiagram van 'n AM ontvanger. (9\

6.2'n 540 kHz dragolf met 'n amplitude van 10 V word ge modul eer deur 'n

6.2.1Bepaal die TWEE hooffrekwensies wat sal verskyn in 'n spektrumanalise van die gemoduleerde golf. (2\

6.2.2Teken die klanksein (2\

6.2.3Teken die dra sein (2\

6.2.4Konstrueer die gemoduleerde golf (2\

6.3Teken die kringdiagram van 'n AM heelgolf detektor. (2\ [19] 808022419

7.1Verduidelik hoe elektromagnetiese golwe deur 'n antenne uit gestraal word (2\

7.2Teken 'n blokdiagram van 'n FM sender en verduidelik kortlik s die funksie van elke fase. (16\ [18] VRAAG 8:18

8.1Verduidelik die verskil tussen 'n gerigte en 'n algerigte (' omnidireksionele '\ antenne

8.2Defin ieer stil sone soos van toepassing op die voortplanting van radio golwe. (2\

8.3Verduidelik kortliks wat sonvlekke is en die invloed wat dit op radiokommunikasie het (2\

8.4Defin ieer breking /refraksie in die ionosfeer (2\

8.5Beskryf met betrekking tot antennas wat bedoel word met bundelbreedte (' bunde width '\ (2\

8.6Teken netjiese, benoemde diagramme van elk van die volgende antenn s:

8.6.1Lus antenne

8.6.2

Mark Allocation

Sections10 + 11 + 10 + 8 + 10 + 19 + 18 + 14 = 100 marks

Paper information

TitleDocument

SubjectKommunikasie Elektronika

LevelN4

Document typeQuestion paper

Year2021

MonthApril

Pages7

Downloads2

Examination context

Decade2020s

Years ago5y

SeasonAutumn (SH)

Start dayThursday

Exam periodApril 2021

Days since exam2,019

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