AM Radio Design

Purpose: The purpose of this lab is to design an AM radio. Introduction: Am Radio uses amplitude modulation (AM). This works by changing the strength of the transmitted signal for the transmitted information. When listening to an AM station such as 1560 of the AM dial, the sine wave of the transmitter transmits data at 1560,000 Hz. This number basically means that the sine wave is repeated 1,560,000 times per second. Data is modulated onto the carrier by changing the amplitude of the sine wave.

Radio works by converting electricity escaping into the air into a signal that can convey music and sound. The process of converting electromagnetic waves into sound is called modulation. AM and FM radio are designed to transmit the amplitude and frequency of radio waves. AM represents amplitude modulation and FM represents frequency modulation. The AM radio encodes the information by determining the individual different amplitudes and converting these amplitudes into audible signals. The FM radio decodes the frequency change into an audible signal

Broadcast and TV signals AM / FM radio and older VHF / UHF TVs operate at lower frequencies than mobile phones. The radio signal is AM (amplitude modulation) or FM (frequency modulation). AM radio is used for very long distance broadcasts, but FM radio covers more areas. The AM signal is transmitted from a large array of high placement antennas and is not affected by the general population as it may be highly exposed to the source. Maintenance personnel are subject to massive RF exposure from AM radio antennas, but the public does not. The FM antenna and the TV broadcasting antenna are much smaller than the AM antenna and are usually mounted on the tower. Exposure to the general population is very low as the RF exposure near the bottom of these towers is below the guideline limit (3)

Radio signals operate primarily with RF design antennas and are based on the frequency at which the radio signal travels and reaches the antenna. Waves are emitted in the form of light, ultraviolet and infrared having the same type but different wavelength and frequency. The mechanisms of electromagnetic mechanisms in the waves are indivisible and the planes of these mechanisms are perpendicular to each other and perpendicular to the path of movement of the waves. The change in the electric field is caused by the voltage change occurring in the antenna passing through the signal, and the magnetic change is caused by the current. It also initiates line of force in the electric field propagating along an axis similar to the antenna, but diffuses as they leave the antenna.