Many two-way systems use the 400 MHz band.
Two radio bands in the UHF range include 400 and 900 MHz. Communications systems that use either of these bands gain greater sound quality and privacy than they would from low-frequency bands like CB or 75-meter shortwave. However, both 400 and 900 MHz offer some minor advantages.
Common Uses
Television, amateur, government, and military radio systems frequently use the 400 MHz band, according to DXing.com. Cordless telephones often utilize the 900 band.
Monitoring
Radio systems on the 900 MHz band remain more private. It's common for police scanners and some specialized radio receivers to cover at least part of the 400 MHz band, allowing more people to listen in. Some models do receive 900 MHz, like the Radio Shack PRO-74.
Low vs. High
High-numbered frequencies typically receive less interference and provide better sound. However, lower frequencies usually yield a greater transmission range.
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