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Re: [Discuss-gnuradio] halfband in CVS
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] halfband in CVS |
Date: |
Tue, 25 Oct 2005 11:18:58 -0700 |
User-agent: |
Mutt/1.5.6i |
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
- [Discuss-gnuradio] halfband in CVS, Eric Blossom, 2005/10/24
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Eric Blossom, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS,
Eric Blossom <=
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Eric Blossom, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Lamar Owen, 2005/10/25
- Re: [Discuss-gnuradio] halfband in CVS, Eric Blossom, 2005/10/25
- [Discuss-gnuradio] CVS keywords, Eric Blossom, 2005/10/26
Re: [Discuss-gnuradio] halfband in CVS, Robert McGwier, 2005/10/25