Question

A bandwidth of 5 MHz is available for AM transmission. If the maximum audio signal frequency used for modulating the carrier is not to exceed 5 kHz, how many stations can be broadcasted within this band simultaneously without interfering with each other?

• A. 200
• B. 300
• C. 400
• D. 500

Answer 1

Answer: (D)

500

Answer 2

: Bandwidth required for each station

$= 2 \times \max imumfrequencyofaudiosignal$

$= 2 \times 5 = 10kHz$

Number of stations which can be broadcast within bandwidth of 5 MHz

$= \frac{5MHz}{10kHz} = \frac{5000kHz}{10kHz} = 500$