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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] DC component |
Date: | Thu, 22 Dec 2011 13:42:28 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
You can use the "calibration" utilities that come with a modern UHD (latest from GIT), assuming either a SBX or WBX board, which can reduce the magnitude of the "DC anomaly", by calibrating the phase and gain errors in the mixers at various frequencies, and compensatingHi all,I'm observing a DC component inside my spectrum as you can see in the two pictures in attachment (differentfrequency ranges), this DC is only shown when there is no active transmission (only noise). Consider I'm already using the UHD's advanced tuning specifying the LO at 3Mhz. I'm receiving a signal witha central frequency of 430MHz with a bandwidth of around 5Mhz, the DC due the LO should be quite away. Is this normal ? Regards Gaetano
in the FPGA. http://files.ettus.com/uhd_docs/manual/html/calibration.html -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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