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What is the advantage of high level modulation over low level modulation?
Wiki User
∙ 12y ago
Low level modulation: Class B (75%max) power amplifiers are used which offers better quality modulation i.e low distortion probability. Minimize generation of harmonics.
The advantage of using a linear RF LP amplifier is that the smaller early stages can be modulated, which only requires a small audio amplifier to drive the modulator.
High level modulation: Class C (90%max) power amplifiers are utilized which improves greatly the efficiency of the transmitter but low in quality i.e higher distortion level is expected.
A large audio amplifer will be needed for the modulation stage, at least equal to the power of the transmitter output itself. Traditionally the modulation is applied using an audio transformer, and this can be bulky. Direct coupling from the audio amplifier is also possible (known as a cascode arrangement), though this usually requires quite a high DC supply voltage (say 30V or more), which is not suitable for mobile units.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agothe high level modulation helps the signal that is message signal to travel over longer distance when compared to low modulated signal. for eg: the content of the message is within the strong walls of the carrier.
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