[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] USRP2 for my Radio Astronomy stuff
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] USRP2 for my Radio Astronomy stuff |
Date: |
Wed, 11 Feb 2009 14:25:49 -0500 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090105) |
Johnathan Corgan wrote:
>
> 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.
>
That's not a problem. I run at various bandwidths, depending on what
machine I'm running on, what I'm
observing, etc. I have a script that invokes the usrp_ra_receiver.py
code, and it can do the necessary
calculations, etc.
> 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.
>
>
Oh. Is that done on the host side? And, well, why? [no criticism
here, just a little puzzled]
>
> Not yet.
>
>
>
Well, geez, Jonathan. What's taking you? :-) :-) :-)
--
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org