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Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC |
Date: |
Fri, 30 Jan 2009 22:29:46 -0500 |
User-agent: |
Thunderbird 2.0.0.18 (X11/20081119) |
Marcus D. Leech wrote:
> Josh Blum wrote:
>
>> svn up!
>>
>> let me know if something goes wrong
>>
>>
> Intersesting.
>
> When I use 8-bit samples with decim=8 or higher, things are peachy.
>
> But when I use decim=16 with 8-bits samples, I get a continuous stream
> of -423dB out of the FFT Log Power sink.
>
> I think what I'm getting is a pile of 0s from the USRP when decim=4.
>
> Can anybody confirm that decim < 8 actually works on the USRP?
>
>
>
>
OK, let's try that again with my brain actually engaged.
Anything with decim=8 or higher, in 8-bit mode, produces "sensible" samples.
Anything with decim lower than 8 (like 4) produces nonsensical results
in the Log Power FFT sink (a continuous block
of -423dB). I suspect that with decim=4, there ain't nothing but
zeros going across the USB.
So, does decim=4 actually work on the USRP, or do I need different firmware?
--
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
- [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Marcus D. Leech, 2009/01/30
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Josh Blum, 2009/01/30
- Message not available
- Message not available
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Marcus D. Leech, 2009/01/30
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC,
Marcus D. Leech <=
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Josh Blum, 2009/01/30
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Firas Abbas, 2009/01/31
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Marcus D. Leech, 2009/01/31
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Josh Blum, 2009/01/31
- Re: [Discuss-gnuradio] Support for 8-bit USB samples in GRC, Marcus D. Leech, 2009/01/31