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Re: [Discuss-gnuradio] halfband in CVS
From: |
Lamar Owen |
Subject: |
Re: [Discuss-gnuradio] halfband in CVS |
Date: |
Tue, 25 Oct 2005 12:21:03 -0400 (EDT) |
User-agent: |
SquirrelMail/1.4.3a-6.FC2 |
> On Tue, Oct 25, 2005 at 12:16:09AM -0400, Lamar Owen wrote:
>> On Monday 24 October 2005 22:19, Eric Blossom wrote:
>> > Matt's been hard at work on the halfband filter for the FPGA, and it's
>> > in pretty good shape. As long as you're not using a decimation factor
>> > of 10, everything looks good. The FPGA code along with the relevant
>> > host side mods are checked in.
>>
>> Very cool.
>> I will attempt to try this out tomorrow on the PARI pulsar system, since
>> it is
>> currently tracking CVS, and the FFT curves are well characterized
>> against the
>> passband of the frontend there, and I know the hot-cold difference,
>> passband
>> shape, etc really well at this point.
> Good. Let us know how it goes.
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.
Burning in now. CVS pull as of thirty minutes ago and the RBF you posted
yesterday evening.
--
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
(828)862-5554
www.pari.edu
- [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 <=
- 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, 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