A radio station has got widespread during World War II when the need for fast communications over long distances increased. In those days, a stationary radio was used, but it was huge, and communications men carried such 2-way radios after their officers. Walkie-talkies also already existed, but they were far from a modern compact walkie-talkie. What does any modern walkie-talkie consist of? A receiver of the radio station is responsible for converting radio frequency signals into acoustic vibrations accustomed to the human ear. First, the received signal is filtered out and increased, then there is a decrease in frequency and transferring…
