10W AM vs 10W SSB vs 10W DSB differences in signal components
时间:04-04
整理:3721RD
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Hi there, suppose I have a 10W AM transmitter, a 10W SSB transmitter and a 10W DSB transmitter.
What are the powers of the different signals components?
For example, in AM the carrier will be 63.24Vpp (50r) and both the sidebands will be 63.24Vpp as well (assuming fully modulated by a single audio tone)?
Or for example in DSB, will both sidebands be at 63.24Vpp (assuming full modulation by a single audio tone)?
What are the powers of the different signals components?
For example, in AM the carrier will be 63.24Vpp (50r) and both the sidebands will be 63.24Vpp as well (assuming fully modulated by a single audio tone)?
Or for example in DSB, will both sidebands be at 63.24Vpp (assuming full modulation by a single audio tone)?
If the AM carrier is 63V, then the sum of the sidebands will be 63V, i..e. each side band will be 31.5V. Now with non carrier systems the power is rated as PEP Peak Envelope Power, the RMS power will be a lot lower. So if the PEP is 10W of a SSB transmission with one tone, then the sideband will be 63V. With a DSB transmission with one tone giving two sidebands, the tones will be 31.5V each. This would correspond to a RMS power of 5W.
In SSB transmission the ratio for ordinary speech is about .3 RMS tp PEP .
Frank
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