The following lines were added (+) and removed (-):
A CB radio signal without modulation is a carrier wave. When you speak into the microphone the AM carrier wave is increased or modulated relative to the level of your voice. The modulation can be increased by speaking more loudly or using a power microphone. The more the wave amplitude is modulated, the virtual output power will seem higher, thus achieving a noticeable power boost in your transmission. Beyond what can be achieved at the microphone it is possible to further increase modulation by internal modification of an adjustable resistor known as a potentiometer, and possibly by removal of a modulation limiting resistor. At this point you will want to speak into the microphone and if the reading constantly peeks you are probably over modulated. Back off the modulation until speech is no longer distorted.At this point you will want to speak into the microphone and if the reading constantly peeks you are probably over modulated. Back off the modulation until speech is no longer distorted. If over-modulated, you will sound distorted and your radio can cause interference to adjacent channels or on other frequency harmonics. There is also a modulation limiter resistor on some CB radios. A modification known as "clipping the modulation limiter" is the removal or bypass of this resistor to achieve even higher modulation. In some radios the limiter may be a diode. There are CB radios that do not have an adjustable potentiometer for modulation, and simply use a fixed resistor. The resistor can be replaced with a jumper made of wire or solder, or a resistor of a lower value.Some of the "export model" CB radios have more than one final stage transistor. Modern export models have two MOSFET type final transistors. These models are not legal for use in the United States. Export models with a high and low power setting will also have two potentiometers that may be modified for audio modulation and two potentiometers to modify for power output, making a total of four potentiometers that may be adjusted.