Medium Frequency (MF) band channel allocation

Q.  When AM signal is of 25KHz, calculate the number of channels required in Medium Frequency (MF) band of 300KHz-3000KHz.
- Published on 12 Oct 15

a. 94
b. 69
c. 85
d. 54

ANSWER: 54
 
Medium Frequency (MF) is the band of frequencies from 300 KHz to 3MHz. The lower portion of the MF band (300to 500 kilohertz) is used for ground-wave transmission for reasonably long distances. The upper and lower ends of the mf band are used for naval purpose.

Frequency available in MF band= 3000 - 300 = 2700 KHz

The bandwidth required by 25 KHz signal = 2 * 25= 50 KHz

Therefore the number of channels available = 2700/ 50 = 54

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