# Tag Info

A radio without any modulation would simply take the input signal, amplify it, and feed it directly into an antenna. In other words, if $x(t)$ is the signal to be transmitted, and $y(t)$ is the transmitted signal, then we're looking for: $$y(t) = x(t)$$ There are some radios that could work somewhat like this. For example, the part of the radio spectrum ...