Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, physicist, and futurist. He was widely known for his contribution to the creation of devices that operate on alternating current, multiphase systems and the motor will make a so-called second phase of the industrial revolution. Tesla has received universal recognition as the outstanding electrical engineer and inventor. High frequency is the designation for the range of radio frequency radio (electromagnetic) waves from 3 up to 30 MHz. It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters. In this book Tesla described them. Read it till the end to know more about High Frequency!