40MHz

40 MHz is a radio frequency within the microwave portion of the electromagnetic spectrum. It falls within the ultra high frequency (UHF) band, specifically between 30 MHz and 300 MHz. This frequency band is utilized for a variety of applications due to its characteristics.

One of the most well-known uses of 40 MHz is in radio-controlled (RC) devices. Remote control hobbyists, particularly those involved with model aircraft, cars, and boats, have historically used this frequency. The 40 MHz band offers a good balance between signal range and antenna size for such applications. However, in many regions, this band has been largely replaced by 2.4 GHz for RC systems due to interference issues and the availability of more advanced spread-spectrum technology at the higher frequency.

Beyond RC toys, 40 MHz has also seen use in some professional wireless systems and older communication equipment. Its propagation characteristics, while not as long-range as lower frequencies, allow for reliable communication over moderate distances and can penetrate some obstacles. The specific allocation and usage of 40 MHz can vary significantly by country and regulatory body. In some cases, it might be used for specific industrial, scientific, or medical (ISM) applications, or as part of a broader spectrum allocation for other services.