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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 3 Amplitude modulation-Reception "
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.1 Page no 120"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# given\n",
"fr=550*10**3 #frequency, Hz\n",
"L=10.0*10**-6 #inductor, H\n",
"fr1=1550*10**3\n",
"\n",
"#calculation \n",
"import math\n",
"a=fr*2*math.pi\n",
"x=fr1*2*math.pi\n",
"b=1/a\n",
"y=1/x\n",
"C1=((b)**2/L)\n",
"C2=((y)**2/L)\n",
"fr2=1100*10**3\n",
"BW=10.0*10**3\n",
"Q=(fr2/BW)\n",
"BW1=(fr1/Q)\n",
"BW2=(fr/Q)\n",
"\n",
"#result\n",
"print\"(a) required range of capacitance is from \",round(C2,12),\"F\",\"to\",round(C1,12),\"F\"\n",
"print\"(b) Q= \",Q\n",
"print\"(c) Bandwidth of receiver at 1550 KHz = \",round(BW1,2),\"Hz\"\n",
"print\"Babdwidth of receiver at 550 KHz = \",BW2,\"Hz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) required range of capacitance is from 1.054e-09 F to 8.374e-09 F\n",
"(b) Q= 110.0\n",
"(c) Bandwidth of receiver at 1550 KHz = 14090.91 Hz\n",
"Babdwidth of receiver at 550 KHz = 5000.0 Hz\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.2 Page no 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# given\n",
"f=620*10**3 #frequency, Hz\n",
"IF=455*10**3\n",
"\n",
"#calculation\n",
"LO=f+IF\n",
"X=IF+LO\n",
"# image frequency of local oscillator\n",
"#station frequency = 620 kHz\n",
"\n",
"#Result\n",
"print\"LO = Hz\",LO\n",
"print\"X-1075kHz=\",X,\"Hz\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"LO = Hz 1075000\n",
"X-1075kHz= 1530000 Hz\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.3 Page no 150"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"V=8*10**-6 #microvolts\n",
"R=50 #input resistance, ohm\n",
"\n",
"#Calculation\n",
"import math\n",
"P=(V**2)/R\n",
"dBm=10*math.log10(P/0.001)\n",
"dBW=10*math.log10(P/1)\n",
"a=(-89+8+3+24+26+26-2+34)\n",
"x=(a/10)\n",
"y=10**x\n",
"z=y*0.001\n",
"\n",
"#Result\n",
"print\"input power is= \",P,\"W\" \n",
"print\"dBm = \",round(dBm,0),\"dBm\"\n",
"print\"dBW = \",round(dBW,0),\"dBw\"\n",
"print\"Pout(dBm) =\",a,\" dBm into speaker\"\n",
"print\"Pout(dBW) =\",z,\"W\"\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"input power is= 1.28e-12 W\n",
"dBm = -89.0 dBm\n",
"dBW = -119.0 dBw\n",
"Pout(dBm) = 30 dBm into speaker\n",
"Pout(dBW) = 1.0 W\n"
]
}
],
"prompt_number": 14
}
],
"metadata": {}
}
]
}
|
