But for a weekend project, [Vinod.S] took the ultrasonic transmitter and receiver from a distance-meter module and used amplitude modulation to send music ultrasonically from his laptop to a ...

When the amplitude of the audio signal is significantly less than that required for 100 percent modulation, it is possible to save on the power consumption of the transmitter by reducing the amplitude ...

There are many different varieties of modulation but they all fall into three basic categories, namely amplitude modulation, frequency modulation and phase modulation, although frequency and phase ...

Transmitter stability was improved by keeping the main channel modulation low, always keeping some energy at the carrier frequency. Loudness didn’t matter; there were few listeners out there anyway. A ...

The mode of operation of the amplitude-modulated transmitter Class-C output stage is discussed, with particular references to the case where the load impedance varies over the working frequency ...

This low-cost AM transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the amplitude modulation transmitter in conjunction with ...

But AM itself is not related to a particular frequency, instead it refers to “Amplitude Modulation”, and was the original modulation mode for conveying speech and music.