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FM to DSB (or AM) converter, can it be done?

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neazoi

neazoi

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power FM to DSB (or AM) converter, can it be done?

Hi, I would like to find out if there is a technique that allows a powerful narrow FM signal to be converted to DSB directly, or even AM with unsupressed carrier. Can it be done in any way directly (passively) without converting the FM to audio and then use this to DSB modulate it? The slope detector (without the rectifying diode) is maybe an answer but I want it to be broadband (2-30MHz) and power converter (for 4-5w input signals to get significant AM output.
 

Not practically.
In its simplest form, think of AM (including SSB, VSB and DSB) as a central frequency with sideband(s) representing the amplitude and displacement from the center representing the modulating frequency. In FM, the equivalents are amplitude converted to displacement and frequency converted to the speed the displacement takes place. Converting from one to the other without remodulating would be very difficult. I'm not a mathematician but it may be possible using high speed sampling and complex digital signal processing but it wouldn't be an easy task.

Brian.
 

betwixt said:
Not practically. In FM, the equivalents are amplitude converted to displacement and frequency converted to the speed the displacement takes place. Brian.
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Very interesting, I didn't know that and I always wondered how baseband amplitude and frequency is represented in FM terms. FM seems more complex to me than SSB in that sense.
 

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