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Re: [Discuss-gnuradio] USRP drivers vs UHD drivers in gnuradio-companion

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] USRP drivers vs UHD drivers in gnuradio-companion
Date: Tue, 25 Jan 2011 20:46:47 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Thunderbird/3.1.7

After successfully installed uhd and gnuradio from the next branch on F13 i run a simple gnuradio-companion test with a flex 1800 as the source and an FFT sink.

It seems that when i use a uhd source my signal is ~ 80dB lower than when using a USRP source. What is the explanation of this?
In "traditional", samples were in the -32K to +32K range, but under UHD, complex samples are in [-1, 1]. Just a scaling issue.

Also, it used to be that I needed to be in the "usrp" group in order to access the USRP. Now i deleted this group and i still have access to usrp (even when the source is not a uhd one but a usrp source)!
My understanding is that if i use the uhd device then i can do that
(ie, don't need to be in the "usrp" group) but it seems to be happening even with the usrp source.
What am I missing?

Merely deleting the "usrp" group from group file doesn't do anything until you log-out/log-in again.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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