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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 1 Introduction to Radio Communication Systems"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 1_3 pgno:3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The transfer function has no finite zeros \n",
+      "The poles \n",
+      "[-0.25+0.96824584j -0.25-0.96824584j]\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "#Chapter 1:Introduction to Radio Communication\n",
+    "#example 1.3 page no 3\n",
+    "#given\n",
+    "import numpy\n",
+    "print('The transfer function has no finite zeros ')\n",
+    "p=numpy.array([1, 0.5, 1])\n",
+    "x=numpy.roots(p)\n",
+    "print('The poles ')\n",
+    "print(x)\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 1_4 pgno:8"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "the image frequency is  MHz 1.91\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "#Chapter 1:Introduction to Radio Communication Systems\n",
+    "#example 1.4 page no 8\n",
+    "#given\n",
+    "fIF=455*10**3#intermediate frequency\n",
+    "fO=1.455*10**6#oscillator frequency\n",
+    "fIM=fIF+fO#image frequency\n",
+    "print'the image frequency is  MHz',fIM*1e-6\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}