Phase locked VFO

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BillC

Guest
I have made a couple of spectrum screen images of my phase locked vfo , locked and unlocked . It is interesting to see the cleaner shape of the locked vfo compared to the unlocked situation . The sweep speed is 10 seconds and the width of the energy is 600 hz at 50 db down .
 

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BillC

Guest
It is interesting that negative feedback which is inherent in phase locked loops cleans up the signal and removes lots of unwanted artifacts.
 
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BillC

Guest
This image shows lots of close in noise and would make for a very noisy output if used with a mixer .
 
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