Q15.10Multiple correct
An audio signal of 15kHz frequency cannot be transmitted over long distances without modulation because
- (a)the size of the required antenna would be at least 5 km which is not convenient. Communication Systems
- (b)the audio signal can not be transmitted through sky waves.
- (c)the size of the required antenna would be at least 20 km, which is not convenient.
- (d)effective power transmitted would be very low, if the size of the antenna is less than 5 km.