Hi Isaac - it sounds like there's a beat frequency - probably between the pulsed signal and the second freqency. I'm assuming you didn't see the problem in the pulsed signal signals.

-- Cinaed

The definition of the beat freuency is the absolute difference between two frequencie.

On 7/20/22 10:03, isaac mario tupac davila wrote:
Hello everyone

My name is Isaac. I'm dealing with a curious behaviour that I can't understand...

I'm generating my pulsed signal by multiplying a vector source and a signal source. Then I'm multiplying this pulsed signal with a continuous signal source at the same frequency, passing then for a low pass filter and seeing it in a time sink block.

The result should be a set of rectangles with the same amplitude and period. The curious thing here is that the amplitude varies in time (from 0 to max amplitude and vice versa). Any idea why the amplitude varies in time?

I attach the flowgraph just in case.

Any idea or help will be appreciated.
Thanks
Isaac t.



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