A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). kHz is most commonly used in reference to radio frequencies and audio signal processing. The name kilocycle is an obsolete name for the same concept.
The frequency of 95 kilohertz, for example, is heterodyned with the frequency of 100 kilohertz and the sum and difference frequencies are again produced.
This frequency, which is identical to the original 5 kilohertz audio applied at the transmitter, is retained and amplified.
Carrier assignments start at 540 kilohertz and continue in a succession of 10-kilohertz increments until the upper limit of the broadcast band is reached.
NOTE: In the charts below, "khz" refers to the frequency in kilohertz, while "meters" is the corresponding wavelength in meters.
So nowadays KFI is assigned to "640 kilohertz", or if you prefer abbreviations, "640 khz"--which should cover all the various ways of saying, for the past 80-plus years, that KFI is located at "640 on your radio dial".
Thus, in the above charts, 560 kilohertz was said by the 300,000 people to be equal to a wavelength of 536 meters, while the more precise 299,820 crowd came up with 535.4 meters.
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