# Chapter 1 Introduction to electronic communication¶

## Example 1.1.a Page no 14¶

In [16]:
#Given
c=300000000
f1=150000000.0
f2=430000000.0
f3=8000000.0
f4=750000.0

#Calculation
W1 = c/f1
W2=c/f2
W3=c/f3
W4=c/f4

#Result
print"(a) Wavelength is ",W1,"meter"
print"(b) Wavelength is ",round(W2,3),"meter"
print"(c) Wavelength is ",W3,"meter"
print"(d) Wavelength is ",W4,"meter"

(a) Wavelength is  2.0 meter
(b) Wavelength is  0.698 meter
(c) Wavelength is  37.5 meter
(d) Wavelength is  400.0 meter


## Example 1.2 page no 15¶

In [11]:
#Given
c=300000000
wavelength=1.5

#Calculation
frequency=c/wavelength

#Result
print"Signal frequncy is ",frequency/1000000.0,"MHz"

Signal frequncy is  200.0 MHz


## Example 1.3 page no 15¶

In [12]:
#Given
wavelength_feet=75
wavelength_meter= 75/3.28
c=300000000

#Calculation
frequency=c/wavelength_meter

#Result
print"The signal frequncy is ",frequency/1000000.0,"MHz"

The signal frequncy is  13.12 MHz


## Example 1.4 page no 15¶

In [25]:
#Given
wavelength_inches=8
wavelength_meter=  8/39.37
c=300

#Calculation
frequency= c/wavelength_meter

#Result
print"The signal freuency is ",round(frequency,1),"MHz"
print"The signnalfrequency is ",round(frequency*10**-3,2),"GHz"

The signal freuency is  1476.4 MHz
The signnalfrequency is  1.48 GHz


## Example 1.5 page no 18¶

In [14]:
#Given
f1=902000000
f2=928000000

#Calculation
bandwidth=f2-f1

#Result
print"Width of the band is ",bandwidth/1000000,"MHz"

Width of the band is  26 MHz


## Example 1.6 page no 19¶

In [15]:
#Given
bandwidth_megahertz= 6
f1_megahertz=54

#Calculation
f2_megahertz=f1_megahertz + bandwidth_megahertz

#Result
print"Upper frequency limit is ",f2_megahertz,"MHz"

Upper frequency limit is  60 MHz