What are the unlicensed frequency bands?

868 MHz interference Systems that use the 868 MHz-band (868–870 MHz), for example, thermostats, fire systems, burglar systems, and DIN-transceivers may have difficulty communicating when there is a strong 800 MHz broadband transmitter nearby.

The industrial, scientific, and medical radio band (ISM band) refers to a group of radio bands or parts of the radio spectrum that are internationally reserved for the use of radio frequency (RF) energy intended for scientific, medical and industrial requirements rather than for communications.

915 MHz is the center frequency of what is known as the 33-centimeter band , which is named after the wavelength at this frequency. It is also known as the 900 MHz band and spans 902 MHz to 928 MHz.12 Nis 2019

900 MHz is a small and diverse band situated between 902-928 MHz . You can get oriented with this supersize spectrum map. We usually refer to it simply as “900,” or “900 MHz,” but it also gets called by its wavelength, the “33 centimeter band.”

The ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific and medical (ISM) purposes, excluding applications in telecommunications .

433MHz is a commonly used frequency band for all types of equipment that require little power, such as garage door openers, headphones, baby phones and remote controls . Also many inexpensive transmitters and receivers for switching devices and light dimmers operate on the 433MHz band.

The lower frequency radio waves of 900 MHz radios provide greater penetration through walls, trees and other obstacles, making it optimal for most non-line-of-sight applications. A typical AW900xTR Radio using high powered AW-15 15dbi antenna can go distances of up to 1500 feet with buildings and/or trees in the way.