Modulation was usually accomplished by a carbon microphone inserted directly in the antenna or ground wire; its varying resistance varied the current to the a microphone severely limited the power of the first radiotelephones; many of the microphones were water-cooled.
Modulation was usually accomplished by a carbon microphone. This carbon microphone was inserted directly in the antenna or ground wire. Its varying resistance varied the current to the a microphone severely limited the power of the first radiotelephones. Many of the microphones were water-cooled.