AM radio is the oldest form of radio broadcasting, and it is still widely used today. It is particularly well-suited for broadcasting over long distances, as it is less affected by atmospheric conditions and other interference than FM radio.
The AM radio band in the United States ranges from 535 kHz to 1705 kHz. This band is divided into several sub-bands, each of which is allocated to a different type of broadcasting service.
* The standard broadcast band, from 535 kHz to 1605 kHz, is used for commercial broadcasting.
* The extended broadcast band, from 1610 kHz to 1705 kHz, is used for non-commercial broadcasting, such as educational radio and religious radio.
* The international broadcast band, from 1705 kHz to 2610 kHz, is used for broadcasting to other countries.
AM radio receivers are relatively simple to design and build, and they are therefore less expensive than FM radio receivers. This has contributed to the continued popularity of AM radio, particularly in developing countries.
However, AM radio has some disadvantages compared to FM radio. AM radio signals are more susceptible to interference from electrical noise, and they can also be affected by atmospheric conditions. Additionally, AM radio has a lower fidelity than FM radio, which means that the sound quality is not as good.
Overall, AM radio is a reliable and affordable way to broadcast audio signals over long distances. However, it is not as high-quality as FM radio, and it is more susceptible to interference.