Deemed University 2009 A.M.I.E.T.E Electronics

(A) 13.5 dB. (B) 15.5 dB.
(C) 10.5 dB. (D) 8.5 dB.

g. An earth station in a satellite network uses an antenna of 12m diameter with an efficiency of 65%. The gain of the earth station antenna is then equal to

(A) 52.16 dB. (B) 56.31 dB.
(C) 50.13 dB. (D) 62.2 dB.
h. A TDMA network of 5 earth stations shares a signal transponder equally. If the frame duration is two ms, the preamble time per station is 20 , and guard bands of five are used ranging from bursts then the data burst duration for every earth station is

(A) 265 . (B) 375 .
(C) 175 . (D) 230.2 .

i. A (15, 11) BCH code can be accurate upto

(A) 2 errors. (B) 3 errors.
(C) 1 fault. (D) 4 errors.

j. Most VSAT systems operate in

(A) X-band. (B) C-band.
(C) Ku-band. (D) L-band.


ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.


Q.2 a. Why geostationary orbit is preferred for all high capacity communication satellite systems? Briefly discuss Keplers 2nd legal regulations of planetary motion, with necessary illustrations. (9)

b. An earth station is located at longitude and latitude. Determine the earth station azymnth and elevation angles with respect to geostationary satellite located at longitude. presume the orbital radius and the earths radius to be 42164 Km and 6378 Km respectively. (7)

Earning:   Approval pending.