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Re: [Discuss-gnuradio] DC component

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: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

Hi 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 ?


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 compensating
  in the FPGA.


Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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