Popular Articles

Pakistan is the obverse image of India and has similar roots.The Pakistan army also has a shared history with the British Indian army and some of the Muslim
Introduction: There is remarkable growth of economic and financial sectors of China in the last two decades. There is no other country that saw such a
The history of the Roman Empire reads like a storybook, chilling and exciting. There was murder, intrigue, love and betrayal. Yet despite all this, it

Latest Articles

Pakistan is the obverse image of India and has similar roots.The Pakistan army also has a shared history with the British Indian army and some of the Muslim
Introduction: There is remarkable growth of economic and financial sectors of China in the last two decades. There is no other country that saw such a
The history of the Roman Empire reads like a storybook, chilling and exciting. There was murder, intrigue, love and betrayal. Yet despite all this, it

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 1)Draw the general block diagram of satellite link. SHAPE \* MERGEFORMAT

Satellite

User

Terrestrial system

Earth Station

User

Terrestrial system

Earth Station

 

untitled8-10

2)Frequency bands used in satellite link.

BAND

DOWNLINK(MHz)

UPLINK(MHz)

UHF-military

250-270

292-312

C band- commercial

3700-4200

5925-6425

X band- military

7250-7750

7900-8400

Ku band-commercial

11700-12200

14000-14500

Ka band- commercial

17700-21200

27500-30000

Ka band- military

20200-21200

43500-45500

3) Frequency bands used for satellite link  in  the lab usually?

S band= 2 to 4 GHz

4)What types of antennas used for earth stations and transponder for satellite link?

  • For earth station, paraboloid antenna with focal point feed and cassegrain antenna. Also horn and phased array antenna can be used.
  • For transponder, dual reflector antenna and microstrip antenna will be used.

5)What type of antenna is used in the lab usually?

Helical antenna

6)Explain   C/N ratio of a satellite link?

C/N = EIRP + Gt -Lp-N

Where, EIRP- Effective Isolated Radiated Pattern of the antenna

Gt – Gain of the antenna

Lp- Path Loss

N- noise

7)Why uplink frequency greater than downlink frequency?

Because the uplink frequency is processed at the earth station, where power consumption is not a big deal. Whereas in satellite the power consumption is a important parameter, since the power is generated by the solar cells.

8)What is the uplink frequency of C band and Ku band and downlink frequency of C band and Ku band?.

C band: uplink- 6 GHz ad down link – 4GHz

Ku band: uplink – 14 GHz and downlink – 12 GHz


9) What is the use of satellite link?

  • The coverage area of a satellite greatly exceeds that of a terrestrial system.
  • Transmission cost of a satellite is independent of the distance from the center of the coverage area.
  • Satellite to Satellite communication is very precise.
  • Higher Bandwidths are available for use.

10) Who launched the first satellite? When?


  • Soviet sat sputnik, October 4,1957, soviet scientist.
  • Sputnik II, November 1957




  • No comments found