narrowband

adjective
nar·row·band | \ ˈner-(ˌ)ō-ˌband , ˈna-(ˌ)rō- \

Definition of narrowband 

: operating at, responsive to, or including a narrow range of frequencies

First Known Use of narrowband

1948, in the meaning defined above

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The first known use of narrowband was in 1948

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