Re: Understanding Pulsed signal Demodulation and decimation in GNU Radio

[Cinaed Simson]

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.