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Re: [Discuss-gnuradio] Artifacts from the USRP Digitizer

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] Artifacts from the USRP Digitizer
Date: Tue, 21 Aug 2007 14:09:10 -0400
User-agent: Thunderbird (X11/20070719)

John Clark wrote:
> To anyone using the following:
> I'm using the USRP with a Microtune UHF band tuner.
> What I see is that there is a significant artifact at 512 MHz, and a
> few more, but
> another 'clear' artifact at 640 Mhz.
> I believe these to be induced by the digitzing clock of 64 MHz.
> However, since I avoid 'hardware' like the plague, if others have
> better explainations
> and corrections I'd like to hear about them.
> In terms of shielding, the Microtune module does seem to have
> shielding, however, on
> the USRP board, I do not see much leading into the Analog Devices chips.
> We are looking at very low signal levels, and so perhaps others have
> not seen these
> artifacts, as they may be looking at much higher signal levels...
> Thanks
> John Clark.
I see artifacts at multiples of 20Mhz.  Somewhat unfortunate, since my
primary observing band is 1416-1424Mhz.
   The 64Mhz artifacts fall outside my passband.

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