Re: [Discuss-gnuradio] halfband in CVS

[Eric Blossom]

On Tue, Oct 25, 2005 at 01:35:55PM -0400, Lamar Owen wrote:
> 
> >>> On Tue, Oct 25, 2005 at 12:16:09AM -0400, Lamar Owen wrote:
> >> With a decimation rate of 8 and a DDC center frequency at 10.7MHz, I see
> >> better than -10dB at the band edge now, which is a greater than 20dB
> >> improvement in flatness.  Very nice.
> 
> > Attached are some captures of plots made with a slightly customized
> > usrp_fft.py (and older version, too; not sure if that impacts the curve
> > shapes).
> 
> To answer my own point, yes, the older code did impact the shape.  Using
> the latest CVS usrp_fft.py as a base instead of the version I used.  Using
> the newer, I get consistent shapes; although, none are quite as flat as
> the decim32 example before... :-)

Hmmm, I just ran some experiments looks using a TV_RX pointed at a
pretty dead spot on the band (403M).  Everything looks good with the
exception of the decim = 10 case.

Using the checked in usrp_fft.py are you still getting the "swoopy"
looking signals, or does it look pretty flat for all but dec = 10?

Eric