Machines which swing together are termed as coherent machine.
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The main difference between coherent and incoherent machine is the consistency in performance. A coherent machine has processors that work in a consistent manner.Ê
What the difference between envelop and coherent detection of AM signals
Why not? It is possible. Try to search for "Non-coherent sequence detection"
zero demodulated signal, which occurs for phase angle equal to + or - 90degrees, represent Quadrature Null Effect of the coherent detector.
Transformer type welding machine