Transmissions are the mechanical systems in cars that allow the driver to shift between different speeds and gears, changing the power and torque available from the engine. Most transmissions use multiple gear ratios, with the lowest gear reducing output speed and the highest gear increasing output speed and torque. These units can be operated manually or by a control unit. Some transmissions also have directional control, allowing the driver to change direction without changing the speed or direction.
The FCC coordinates specific frequencies for use at several locations. They mandate a certain number of radios per site, and can even fine users for using abusive language or abusing other users. They also have the power to revoke a user's license if they're not paying attention to the rules. This means you can't talk to people in the next room unless they can understand what you're saying. And you can't talk on a cell phone while using a radio.
The frequency and wavelength of radio waves used for transmissions differ according to their purpose. Higher-frequency waves can penetrate walls more effectively. Long-wavelength radio waves, on the other hand, will go straight through the atmosphere, meaning they're useless over large distances. This makes them the preferred option for transmissions in remote and rugged terrain. If you're a skier or a mountain guide, make sure you install a repeater on the mountain's summit or a high building to avoid losing signal.
