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Re: [Discuss-gnuradio] USRP N200, RFX 1800 not receiving signal

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] USRP N200, RFX 1800 not receiving signal
Date: Wed, 24 Aug 2011 11:32:54 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20110812 Thunderbird/6.0

On 24/08/2011 9:41 AM, Urs Hunkeler wrote:

My USRP N200 / RFX 1800 combination seems to not receive any useful signal. The software seems to work, there are no error messages, and the USRP seems to sample noise but does not even show a signal from a signal generator.

Has anybody an idea what I might be doing wrong, or what else I could try?

I use Ubuntu and installed/compiled the latest GNUradio / UHD software. I used the uhd_fft.py script to test the radio. I tried different frequencies, both antennas and different transmit power level on the signal generator (-110dBm - -10dBm). The only thing I see is noise, which changes slightly when I change the gain.

The command to start uhd_fft.py was:

uhd_fft.py -A RX2 -f 2G --samp-rate=16M

Since 16M isn't a "proper" sample rate for a N200, perhaps that's the problem.

Try 1.0M, 2.0M, 2.5M, 5.0M, 10M

If it's just a narrowband signal, you don't need very much host-side bandwidth.

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