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Re: [Discuss-gnuradio] USRP2 for my Radio Astronomy stuff

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] USRP2 for my Radio Astronomy stuff
Date: Wed, 11 Feb 2009 11:18:56 -0800

On Wed, Feb 11, 2009 at 11:10 AM, Marcus D. Leech <address@hidden> wrote:

> So, what are the gotchas that are going to bite me when supporting USRP2
> in code that's used to USRP1?
> Setup seems a little different--only 1 TX and 1 RX channel, etc.

Yes, it is simpler in this regard, no subdev, etc.

One significant change to consider is your sample rate plan--you now
have different ADC and DAC frequencies, so depending on what you're
doing, your integer decimation ratios may need to change.

The floating point source for the usrp1 has a range of [-32768.0
32767.0], while for the usrp2 it is automatically scaled to [-1.0
1.0].  This will affect your front end range scaling or software AGCs.

> Also, is there a way to set 8-bit mode on USRP2?

Not yet.


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