broadcasting in the early 20th century was plagued by
poor reception. With no reference point to compare to,
transmission towers often veered off their assigned
frequencies, causing interference between stations.
In 1923, NIST began broadcasting precise frequency signals
over its laboratory transmitter, WWV, then in Washington,
DC. These broadcasts, a portable quartz frequency generator
modified by NIST, and improved regulation of stations,
soon gave radio broadcasting a clearer future.