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Re: [Discuss-gnuradio] USRP 2 Daughter Cards

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] USRP 2 Daughter Cards
Date: Thu, 19 Feb 2009 09:54:31 -0800
User-agent: Mutt/1.5.18 (2008-05-17)

On Thu, Feb 19, 2009 at 10:15:29AM -0500, jim graham wrote:
> I am trying to use the USRP 2 radio.  I have been using the
> rx_streaming_sample script to collect data.
> If I use the rfx1800 daughtercard the results from the set_center_freq
> command seem correct but the output
> looks as if the receive channel is not connected (changing gain does not
> affect output levels).

What OS, version, distribution, architecture?
Which version of the GNU Radio code?

Are you feeding this with a signal generator?  What's your input
signal level?  Which antenna port are you connected to?  Have you tried
running usrp2_fft.py?

> If I try the lfrx or dbs daughter cards the set_center_freq response
> appears incorrect. The baseband frequency is 0 and the ddc frequency
> is the negative of the commanded frequency.

Those values are correct.  Have you tried injecting a signal into the
board and looking at it using usrp2_fft.py?


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