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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. A [[Citizen Band]] or 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. Most CB radios have a speaker on the bottom. It is the bottom case cover that is typically removed to gain access to the internal components. When removing the bottom case lid take care not to pull the cover away from the radio such that the speaker wires are jerked off of the speaker or board. CB radio people tend to refer to the potentiometer or pot as a "can" and they will talk about tuning the cans.*CB radio people tend to refer to the potentiometer or pot as a "can" and they will talk about tuning the cans.*The potentiometer may be referred to as a "trimmer" or "trim pot." The potentiometer is simply an adjustable or variable resistor. Trimmers can actually be variable resistors (potentiometers), variable capacitors, or trimmable inductors.*CB radio people tend to refer to the final stage transistor as a "pill" and will talk about burning out the pills.CB radio people tend to refer to the final stage transistor as a "pill" and will talk about burning out the pills.