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AM radios can use frequencies in the range 535 kHz to 1605 kHz. Frequencies are assigned at 10 kHz intervals, from 540 kHz to 1600 kHz.
BW = (1 MHz - 10 KHz) = (1,000 KHz - 10 KHz) = 990 KHz
Khz is a measure of wavelength. i.e. my dick is 1,000 Khz
kHz means 1000 hertz. To convert from kHz to hz, multiply the number of kHz by 1000 and the product will be in hertz.
1,000 Hz = 1 KHz
1,980 Hz = 1.980 KHz