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Re: [Discuss-gnuradio] Signal Decay with USRP N210 Using BasicRX

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Signal Decay with USRP N210 Using BasicRX
Date: Wed, 21 Sep 2011 12:24:50 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110831 Lightning/1.0b2 Thunderbird/3.1.13

On 09/21/2011 12:18 PM, valentac wrote:
> So I've been doing some development and my USRP using a custom RF front end
> via the BasicRX daughter board and have noticed an RC decay. I thought this
> was my system, but I recently just put a signal generator directly into the
> USRP and noticed the same thing (although not as high of a time constant).
> My high frequencies are passing through fine (sharp transitions are
> present), but when a level is held at a positive or negative voltage, it
> decays to zero.
> Is there a limitation on the USRP or BasicRX card? Or something else I'm
> missing?

Yes, the basic boards cannot pass DC (and low frequency). You will want
an LFRX for that. -josh

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