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Re: [Discuss-gnuradio] Is file sink block resetting USRP?

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Is file sink block resetting USRP?
Date: Wed, 27 May 2015 18:30:47 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

On 05/27/2015 05:52 PM, Carl Olsson wrote:
Hi all,

I use a file sink block in my flow graph to record samples from a USRP N210. I start the flow graph and then after some time starts to record using the file sink block by switching it on using a selector block.

My question is, when the file sink is activated, is the flow graph in any way restarted?

I have attached a plot of the real part of the samples I recorded. I see strange behavior in the beginning as I would expect if I instantly started to record when the flow graph is started (due to the time it takes for the radio to tune in).

The reason to why I am asking is that I suspect that the phase of the signal is changed when I start to record, and maybe this could explain why.

Best regards,


Discuss-gnuradio mailing list
My recollection is that the selector blocks stop the graph, reconfigure it, and start it again, which means source streams probably get restarted.

When I've need to do this in the past, I just tie the filename to a variable that is controlled by my "start recording" button--when I'm not recording, the file sink is set to "/dev/null", and when I *am* recording, it's set to the target file. 

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