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Re: [Discuss-gnuradio] Problem with capture playout WBX daughterboard US

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Problem with capture playout WBX daughterboard USRP N210
Date: Tue, 23 Aug 2011 08:39:06 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110617 Lightning/1.0b2 Thunderbird/3.1.11

On 08/23/2011 10:36 AM, Bastien Auneau wrote:
> Hi All
> Using USRP N 210, WBX board, GPSDO, UHD 3.2.2, under Windows 7
> We want to use the example scripts to capture then playout a signal we
> get from the air (satellite link with bursts). We proceed as follow :
> 1. capture using rx_samples_to_file.exe --type short --rate 10000000
> --freq 1057232000 --gain 10
> 2. playout the newly captured file
> tx_samples_from_file.exe --type short --rate 10000000 --freq 1057232000
> --gain 2
> 3. Using a spectrum analyzer, we expect to see similar things when
> looking at signal from air (few small carriers, bursty), than when
> looking at USRP played out signal.
> But the USRP only output an around 2.5 MHz carrier, which does not
> contains the burst of the original carrier (looking on live signal the
> centered carrier constantly goes up and down). The carrier is extremely
> steady during all the playout time. Also, the doc
> (http://www.ettus.com/downloads/ettus_daughterboards.pdf) specifies
> 30MHz bandwidth, why can't we see the same bandwidth from played out
> signal than from original signal ?
> Also, we use the rx/tx port of the WBX board to capture then to playout

Here is my take on your method:


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