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Correlations 2 : Communications 2nd Sem 2526

Correlations 2 : Communications 2nd Sem 2526

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45° maximum phase shift of two adjacent bits combination is possible in _________ system

A reflection that occurs from a surface whenever there is a sudden change in the refractive index at the end of the fiber.

Which of the following is used to protect the core and the cladding of the fiber?

Kevlar strength members

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A 8.5kHz sine wave is mixed with a 5MHz carrier through a nonlinear device. Which frequency is not present in the output signal?

ECE Board Exam November 1998 Type of antenna which is normally used for satellite tracking services

1 um

4 um

2 um

3 um

0.505

0.224

0.234

0.604

Calculate the radio horizon for 50 ft transmitting antenna and receiving antenna of 20ft. Calculate the required height increase for the transmitting antenna if a 10% increase in radio horizon were required.

18.6

13.5

17.6

15.4

A transmitter has an output power of 150W. It is connected to its antenna by a feedline that is 15m long and properly matched. The loss in the feedline is 1.5 dB / 100m. The antenna has a gain of 6.5 dBi. What is the EIRP in the direction of maximum antenna gain?

156 W

212 W

138 W

412 W

A transmission line has 3.5 pF of capacitance per foot and 150 mH of inductance per foot. Calculate its characteristic impedance.

103k

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