The AM radio transmitter does not use any modulator transformer ... T1 by varying the current through it in accordance with the audio signal’s amplitude. RFC1 is used to block the carrier RF signal ...

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 block diagram ... the amplitude and phase of the carrier is a flexible way to create a modulated carrier. Even though it is an old technology from the 1920s, FM is still used today in ...

The first spark gap transmitters worked well, but were of course quite dirty in their operation. In 1906 the venerable method of amplitude modulation radio was born ... Figure 3: 16-QAM constellation ...

Modulating RF signals led to practical commercial radio stations and even modern cell phones. Although there are many ways to modulate an RF carrier with voice AM or amplitude modulation is the ...