Re: [Discuss-gnuradio] DC component

[Evan Merewether]

I have noticed that there are some fixed frequency spurious signals in my
N210.  These spurious signals are probably associated with the harmonics of
the clock.  If your DC component is at some nice even frequency like 2GHz, I
would suspect a spurious signal to be the cause.

Evan

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Marcus D. Leech
Sent: Thursday, December 22, 2011 11:42 AM
To: address@hidden
Subject: Re: [Discuss-gnuradio] DC component

> 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 ?
>
> Regards
> Gaetano
>
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.

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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