Re: [Discuss-gnuradio] signal distortion in simple code

[Dan Gisselquist]

Chuck,

(Sorry for the resend ... I had intended to send to the maillist as  
well ...)

Looking closely at this problem, it looks like you may have buffer  
problems--that is, you may be missing buffers by not keeping up with  
the raw data rate.

Tell me, are the phase jumps multiples of the buffer length in time?

Another way to debug this problem would be to take the output of your  
A/D straight to whatever you have that's really fast.  (Big memory  
window, disk if it's fast enough)  Don't do any processing on it.   
After you've gotten a sizeable enough chunk of it (a couple wavelengths  
ought to suffice), then look for the distortion.  If it disappears  
using this method, then I'm going to bet you weren't keeping up with  
the buffers as they were filling before.

Dan

On 12/30/2004 10:01:24 AM, cswiger wrote:
> Gang - can anybody shed some light on my problem, it's a very
> simple script that has me pulling out hair.   The situation is
> laid out on this page:
>
> http://webpages.charter.net/cswiger/problem
>
> and is why is the real world signal all broken up while the
> software generated signal perfect?  The signal generator and
> ADC are all working fine! I must be overlooking something.
>
> Any tips appreciated.
>
> --Chuck
>
>
>
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