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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:3889f080e541059ccdb3a0ca28e3a8926a614c5d9e6ab3f2de315570240fb716"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4: Radio Wave Propagation"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.1, Page 97"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Variable Declaration\n",
+      "\n",
+      "El=50  #Elevation Angle(degrees)\n",
+      "h0=0.6 #Earth station altitude(km)\n",
+      "hr=3   #Rain height(km)\n",
+      "R01=10 #Point Rain Rate(mm/hr)\n",
+      "f=12   #frequency(GHz)\n",
+      "ah=0.0188\n",
+      "bh=1.217\n",
+      "av=0.0168\n",
+      "bv=1.2\n",
+      "#Calculation\n",
+      "Ls=(hr-h0)/math.sin(El*3.142/180) #Slant path length(km)\n",
+      "LG=Ls*math.cos(El*3.142/180)      #Horizontal projection(km)\n",
+      "r01=90/(90+4*LG)      #Reduction factor\n",
+      "L=Ls*r01              #Effective path length(km)\n",
+      "alphah=ah*R01**bh     #Specific Attenuation\n",
+      "AdBh=round(alphah*L,2)#Rain Attenuation for horizontal polarization\n",
+      "alphav=av*R01**bv   #Specific Attenuation\n",
+      "AdBv=round(alphav*L,2)#Rain Attenuation for vertical polarization\n",
+      "\n",
+      "#Results\n",
+      "\n",
+      "print\"Rain Attenuation for given conditions and horizontal polarization is\",AdBh,\"dB\"\n",
+      "print\"Rain Attenuation for given conditions and vertical polarization is\",AdBv,\"dB\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Rain Attenuation for given conditions and horizontal polarization is 0.89 dB\n",
+        "Rain Attenuation for given conditions and vertical polarization is 0.77 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.2, Page 99"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Variable Declaration\n",
+      "ah=0.0188\n",
+      "bh=1.217\n",
+      "av=0.0168\n",
+      "bv=1.2\n",
+      "R01=10  #Point Rain Rate(mm/hr)\n",
+      "L=2.8753812  #Effective path length calculated in Example 4.1(km)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "#Factors depending on frequency and polarization\n",
+      "ac=(ah+av)/2 #a for circular polarization\n",
+      "bc=(ah*bh+av*bv)/(2*ac) #b for circular polarization\n",
+      "\n",
+      "alpha=ac*R01**bc  #Specific Attenuation(dB)\n",
+      "AdB=round(alpha*L,2)  #Rain Attenuation(dB)\n",
+      "\n",
+      "\n",
+      "#Results\n",
+      "\n",
+      "print \"The Rain Attenuation for circular polarization is\",AdB,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The Rain Attenuation for circular polarization is 0.83 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file