Learn the basics of Radio Technology
There is hardly an area where we can do without the wireless transmission of voice and data. Whether television, radio, mobile or computer networks. Radio technology is part of our lives everywhere. Radio technology allows us to relay info over the air wirelessly.
What seems so commonplace to us is related to various physical effects and complicated and sensitive technology. The physical processes are presented in a clarified way for a natural explanation.
What is Radio Technology?
Heinrich Hertz was the first to denote how electrical and magnetic fields can be used to relay messages. Back in 1886, there were no electron tubes or transistors. Therefore, the transmission signal was generated utilizing a spark gap. Only later did it become apparent that the range of the signals, the radio waves, can be increased with long wires. The spark gap died, the antenna was born, the name Hertz remained. And therefore, any technical device that uses electric and magnetic fields to transmit data or communicate is assigned to radio engineering just like the radio direction finder.
How do Radio Waves Arise?
Radio waves do not arise by themselves. To generate radio waves a vibrator is necessary. This can be an oscillator that spawns the fundamental or carrier wave. It is a physical effect. In electronics, however, one usually doesn’t speak of waves because radio waves are frequencies.
The oscillator spawns an AC signal with a specific frequency. From a certain figure of oscillations per sec (frequency) electrical signals tend to radiate into free space. Frequencies (f) are given in the unit Hertz, short Hz. Heinrich Hertz serves as namesake here.
What is the Carrier Frequency?
The carrier frequency generated by the oscillator is not yet information. The information must first be in the form of another frequency to the transporter frequency piggybacked. Only then can information, usually different states in coded form, be transmitted. These methods are called modulation. The best-known modulation techniques are Amplitude Modulation, Phase Modulation, and Frequency Modulation. The frequency modulation is used in the transmission of the analog FM radio station.