Radio Frequency by Steve Winder and Joe Carr - HTML preview

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9.4 Bandwidth and frequency designations

A four symbol code should be used to express bandwidth and frequency to three significant figures. A letter to denote the unit of frequency is placed in the position of the decimal point, where the letters and bandwidths are:

Letter Bandwidth
H Below 1000 Hz
K Between 1 and 999 kHz
M Between 1 and 999 MHz
G Between 1 and 999 GHz

So, a frequency of 120 Hz is 120H, while a frequency of 12 Hz is 12H0 etc.