![]() Thus most stations can transmit carefully designed digital signals on their adjacent channels without interfering with other local stations, and usually without co-channel interference with distant stations on those channels. Furthermore, long-standing FCC licensing practice, dating from when receivers had poor adjacent-channel selectivity, assigns stations in geographically overlapping or adjacent coverage areas to channels separated by (at least) 400 kHz. In the United States, FM channels are spaced 200 kHz apart as opposed to 100 kHz elsewhere. This compares with more than 2,200 services operating with the DAB system.Ī 400 kHz wide channel is required for HD FM analog-digital hybrid transmission, making its adoption problematic outside of North America. claimed its HD Radio technology was used by more than 3,500 individual services, mostly in the United States. Digital Radio Mondiale ( DRM‑30 and DRM+ configurations) was intended mostly for shortwave radio.īy May 2018, iBiquity Digital Co.Eureka 147, is the most common standard in Europe. Digital Audio Broadcasting (DAB), a.k.a. ![]()
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