Answered: 1.) A communication system is defined…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

1.) A communication system is defined below:
Transmitter Power: = 45 dBm; Frequency = 1 GHz
Transmit Antenna: Gain = 12 dB, height above ground = 50 meters;
Receive Antenna: Gain = 6 dB, height above ground= 2.5 meters
Find the received power (in dBm) at a range of 4 kilometers:
a. using the free-space range equation

b. using the near-earth range equation

Using the results of the calculations in a & b above:

c. determine the best prediction of the received power (in dBm) at the 4 kilometer range.

2.) A transmitter operating at 80 MHz has an output power of 1.5 kW which is fed to an antenna with a gain of 20 dB. Determine the "keep-out" distance (in meters) required to meet the safety standard.

clear and easy to understand. Thanks

Power density (mW/sq. cm)
100
10
1
10 100 1-10³ 1-104 1-105
fen
MHz
Frequency (MHz)
Radiated EM Safety Standard Levels
0.1
1

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