Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 18

The audio frequency response of an AM transmitter, measured from microphone input to the secondary of the modulation transformer, is 3 dB down at 3 kHz from its level at 1 kHz. If a 1 kHz signal modulates the transmitter to 90%, what will be the modulation percentage due to a 3 kHz signal with the same level at the input