{ "metadata": { "name": "", "signature": "" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "chapter 09 : Ground wave propagation" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.1 : page 9-23" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import sqrt\n", "#given data :\n", "HT=50 #in meter\n", "HR=10 #in meter\n", "f=60 #in MHz\n", "P=10 #in KW\n", "D=10 #in Km\n", "D=D*10**3 #in m\n", "c=3*10**8 #speed of light in m/s\n", "lamda=c/(f*10**6) #in meter\n", "#Part (i) \n", "d=3.55*(sqrt(HT)+sqrt(HR)) #in Km\n", "print \"Maximum line of sight range = %0.2f km \" %d \n", "#Part (ii)\n", "Et=88*sqrt(P*1000)*HT*HR/(lamda*D**2)\n", "print \"The field strength at 10 km = %0.1e V/m\" %Et \n", "#Part (iii)\n", "#Formula : Et=88*sqrt(p)*HT*HR/(lambda*D**2)\n", "Et=1 #in mV/m\n", "D=sqrt(88*sqrt(P*1000)*HT*HR/(lamda*Et*10**-3)) #in m\n", "print \"Distance = %0.3f km \" %(D/1000)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Maximum line of sight range = 36.33 km \n", "The field strength at 10 km = 8.8e-03 V/m\n", "Distance = 29.665 km \n" ] } ], "prompt_number": 4 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.2 : page 9-24" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import sqrt\n", "#given data :\n", "P=200 #in KW\n", "D=20 #in Km\n", "D=D*10**3 #in m\n", "E=300*sqrt(P)/D #in V/m\n", "print \"Field Strength at 20 km = %0.2f mV/m \" %(E*10**3)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Field Strength at 20 km = 212.13 mV/m \n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.3 : page 9-24" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#given data :\n", "HT=10 #in meter\n", "HR=3 #in meter\n", "P=200 #in W\n", "D=50 #in Km\n", "D=D*10**3 #in Km\n", "f=150 #in MHz\n", "c=3*10**8 #speed of light in m/s\n", "lamda=c/(f*10**6) #in meter\n", "E=88*sqrt(P)*HT*HR/(lamda*D**2) #in m\n", "print \"Field Strength at 20 km = %0.2f microV/m \" %(E*10**6)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Field Strength at 20 km = 7.47 microV/m \n" ] } ], "prompt_number": 6 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.4 : page 9-25" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import sqrt\n", "#given data :\n", "HT=100 #in meter\n", "d=60 #in Km\n", "#Formula : d=4.12*(sqrt(HT)+sqrt(HR)) #in Km\n", "HR=(d/4.12-sqrt(HT))**2 #in meter\n", "print \"Height of receiving antenna = %0.2f m\" %HR" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Height of receiving antenna = 20.82 m\n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.5 : page 9-25" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import sqrt\n", "#given data :\n", "HT=3000 #in meter\n", "HR=6000 #in meter\n", "d=4.12*(sqrt(HT)+sqrt(HR)) #in Km\n", "print \"Maximum possible distance = %0.2f km\" %d" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Maximum possible distance = 544.80 km\n" ] } ], "prompt_number": 8 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.6 : page 9-25" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log10\n", "#given data :\n", "f_MHz=3000 #in MHz\n", "d_Km=384000 #in Km\n", "PathLoss=32.45+20*log10(f_MHz)+20*log10(d_Km) #in dB\n", "print \"Path loss = %0.2f dB \" %PathLoss" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Path loss = 213.68 dB \n" ] } ], "prompt_number": 9 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.7 : page 9-26" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import pi\n", "#given data :\n", "#Part (i)\n", "D=10 #in Km\n", "lamda=10000 #in meter\n", "LP=(4*pi*D*1000/lamda)**2 #in dB\n", "print \"Path loss = %0.2f dB\" %LP\n", "#Part (ii)\n", "D=10**6 #in Km\n", "lamda=0.3 #in cm\n", "LP=(4*pi*D*1000/(lamda*10**-2))**2 #in dB\n", "print \"Path loss = %0.2e dB \" %LP \n", "#Note : Answer in the book is wrong as value putted in the solution is differ from given in question." ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Path loss = 157.91 dB\n", "Path loss = 1.75e+25 dB \n" ] } ], "prompt_number": 10 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.8 : page 9-26" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import sqrt\n", "#given data :\n", "HT=50 #in meter\n", "HR=5 #in meter\n", "d=4.12*(sqrt(HT)+sqrt(HR)) #in Km\n", "print \"Range of LOS system = %0.2f km\"%d" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Range of LOS system = 38.35 km\n" ] } ], "prompt_number": 11 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Exa 9.9 : page 9-26" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import pi\n", "#given data :\n", "PT=5.0 #in KW\n", "PT=PT*1000 #in W\n", "D=100.0 #in Km\n", "D=D*10**3 #in m\n", "f=300.0 #in MHz\n", "GT=1.64 #Directivity of transmitter\n", "GR=1.64 #Directivity of receiver\n", "c=3*10**8 #speed of light in m/s\n", "lamda=c/(f*10**6) #in meter\n", "Pr=PT*GT*GR*(lamda/(4*pi*D))**2\n", "print \"Maximum power received = %0.3e W\"% Pr\n", "# Answer wrong in the textbook." ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Maximum power received = 8.516e-09 W\n" ] } ], "prompt_number": 14 } ], "metadata": {} } ] }