1330Hz

1330 Hz, commonly referred to as 1330 kHz, is a carrier frequency in the medium frequency (MF) band used for AM radio broadcasting. The AM broadcast band in most parts of the world extends from 530 kHz to 1700 kHz, and 1330 kHz falls comfortably within this range. Because of its position on the lower end of the band, signals transmitted at this frequency can travel significant distances during nighttime via skywave propagation, though they are also susceptible to atmospheric noise and interference from other stations on adjacent frequencies.

In the United States, the Federal Communications Commission (FCC) assigns 1330 kHz to a number of stations, primarily on a local or regional basis. While specific allocation can vary over time, stations such as KIMN in Kansas City, Missouri and WMOF in Orlando, Florida have historically broadcast on this frequency. Many of these stations employ a talk radio or news format, taking advantage of the wide regional reach possible at 1330 kHz. Internationally, the frequency is similarly used by broadcasters in Canada, Mexico, and parts of Europe, each operating under their own national regulatory frameworks.

From a technical standpoint, 1330 kHz is subject to the characteristic attenuation associated with midband frequencies when propagated over land. Groundwave propagation at this frequency offers reliable daytime reception within a radius of roughly 50 kilometers, while nighttime reception can extend beyond 200 kilometers depending on ionospheric conditions. To mitigate interference, stations operating on 1330 kHz often use directional antennas or reduced power during critical hours.

Beyond radio transmission, the numerical value 1330 Hz sometimes appears in audio engineering contexts, where it represents a test tone within the audible range. However, the primary association of 1330 Hz remains the AM broadcast carrier frequency, with its regulatory, technical, and historical significance well documented in telecommunications literature.