{
"metadata": {
"name": "",
"signature": "sha256:0174690c77909c04b196794e86400339cc9b848d5d1c10d76a582a253b10cfc2"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter14, ground Wave Propagation"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.6.1, page : 14-11"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log10\n",
"d=36000 #km(height of satellite)\n",
"f=4000 #MHz(frequency)\n",
"GT=20 #dB(Transmitter gain)\n",
"GR=40 #dB(Reciever gain)\n",
"PT=200 #W(Transmitted power)\n",
"PT=10*log10(PT) #dB(Transmitted power)\n",
"print \"Part (i):\" \n",
"Ls=32.44+20*log10(f)+20*log10(d) #dB(Free space transmission loss)\n",
"print \"\\tFree space transmission loss = %0.2f dB \"%Ls \n",
"print \"Part (ii):\" \n",
"PT=200 #W(Transmitted power)\n",
"PT_dB=10*log10(PT) #dB(Transmitted power)\n",
"PR_dB=PT_dB+GT+GR-Ls #dB(Recieved power)\n",
"PR=10**(PR_dB/10) #W(Recieved power)\n",
"print \"\\tReceived power = %0.2f pW \"%(PR*10**12)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Part (i):\n",
"\tFree space transmission loss = 195.61 dB \n",
"Part (ii):\n",
"\tReceived power = 5.50 pW \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.6.2, page : 14-12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log10, sqrt, pi\n",
"\n",
"f=150 #MHz(frequency)\n",
"c=3*10**8 #m/s(speed of light)\n",
"GT=1.64 #dB(Transmitter gain)\n",
"PT=20 #W(Transmitted power)\n",
"d=50 #km(distance)\n",
"lamda=c/(f*10**6) #m(Wavelength)\n",
"E=sqrt(30*GT*PT)/(d*1000) #V/m(emf induced)\n",
"le=lamda/pi #m(Effective length)\n",
"Voc=E*le #V/m(Open circuit voltage)\n",
"print \"Open circuit voltage = %0.2f micro Volt \"%(Voc*10**6) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Open circuit voltage = 399.40 micro Volt \n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.1, page : 14-24"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log10, sqrt, pi\n",
"\n",
"ht=100 #m(transmitter height)\n",
"hr=100 #m(receiver height)\n",
"d=3.57*(sqrt(ht)+sqrt(hr)) #km(Range)\n",
"print \"Range of space wave propagation = %0.2f km \"%d "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Range of space wave propagation = 71.40 km \n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.2, page : 14-27"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt, pi\n",
"\n",
"ht=100 #feet(transmitter height)\n",
"hr=50 #feet(receiver height)\n",
"d=1.4142*(sqrt(ht)+sqrt(hr)) #miles(Range)\n",
"print \"Radio horizon = %0.2f miles \"%d "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Radio horizon = 24.14 miles \n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.3, page : 14-28"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt\n",
"ht=80 #m(transmitter height)\n",
"hr=50 #m(receiver height)\n",
"d=4.12*(sqrt(ht)+sqrt(hr)) #km(Range)\n",
"print \"Maximum distance = %0.2f km \"%d "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum distance = 65.98 km \n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.4, page : 14-28"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt\n",
"ht=100 #m(transmitter height)\n",
"d=80 #km(receiver height)\n",
"hr=(d/4.12-sqrt(ht))**2 #m(range)\n",
"print \"Required height of receiving antenna = %0.2f meter \"%hr "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Required height of receiving antenna = 88.69 meter \n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.5, page : 14-28"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"ht=100 #m(transmitter height)\n",
"d=4.12*sqrt(ht) #km(Horizon distance)\n",
"print \"Horizon distance = %0.2f km \"%d "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Horizon distance = 41.20 km \n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 14.10.6, page : 14-36"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt\n",
"P=35 #W(Transmitter power\n",
"ht=45 #m(transmitter height)\n",
"hr=25 #m(receiver height)\n",
"f=90 #MHz(frequency)\n",
"c=3*10**8 #m/s(Speed of light)\n",
"d=4.12*(sqrt(ht)+sqrt(hr)) #km(line of sight distance)\n",
"print \"Distance of line of sight communication = %0.2f km \"%d \n",
"lamda=c/(f*10**6) #m(Wavelength)\n",
"ER=88*sqrt(P)*ht*hr/(lamda*(d*1000)**2) #V/m(Field strength)\n",
"print \"Field strength = %0.2f micro Volt/meter \"%(ER*10**6) \n",
"#Answer is wrong in the textbook."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Distance of line of sight communication = 48.24 km \n",
"Field strength = 83.90 micro Volt/meter \n"
]
}
],
"prompt_number": 11
}
],
"metadata": {}
}
]
}