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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4 single-sideband communication"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.1 Page no 172"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"x=1*10**6 #DSB range\n",
"y=10**(80/20.0)\n",
"\n",
"#calculation\n",
"import math\n",
"z=math.sqrt(y)\n",
"df=200.0\n",
"Q=(x*z)/(4.0*df)\n",
"a=100*10**3\n",
"Q1=(a*z)/(4.0*df)\n",
"\n",
"\n",
"#result\n",
"print\"(a) Q for 1MHz = \",Q\n",
"print\"(b) Q for 100KHz = \",Q1"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) Q for 1MHz = 125000.0\n",
"(b) Q for 100KHz = 12500.0\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.2 Page no 178"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"a=3*10**6\n",
"b=3.1*10**6 #new DSB signal range\n",
"c=2.9*10**6 #new DSB signal range\n",
"\n",
"#calculation\n",
"Q=(a/(b-c))\n",
"\n",
"#result\n",
"print\"the required filter Q is = \",Q"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"the required filter Q is = 15.0\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.4 Page no 187"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"a=455\n",
"x=2000+1 #frequency\n",
"y=2000+3 #frequency\n",
"\n",
"#calculation\n",
"c=2000+a #local oscillator value\n",
"d=c-x\n",
"e=c-y\n",
"f=a-454\n",
"g=a-452\n",
"\n",
"#result\n",
"print\"RF =\",x,\"KHz\", \"at which first mixer input=\" ,y,\"kHz\"\n",
"print\"local oscillator value is \",c,\"KHz\"\n",
"print\"First mixer output is\",d,\"to\",e,\"KHz\" #IF amp and second mixer input\n",
"print\"BFO = \",a,\"KHz\"\n",
"print\"Second mixer output is\",f,\"KHz\", \"and audio amplifier value is =\",g, \"kHz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"RF = 2001 KHz at which first mixer input= 2003 kHz\n",
"local oscillator value is 2455 KHz\n",
"First mixer output is 454 to 452 KHz\n",
"BFO = 455 KHz\n",
"Second mixer output is 1 KHz and audio amplifier value is = 3 kHz\n"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}
|
