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Re: [Discuss-gnuradio] usrp_source to file_sink ... what gets written wh

From: Mir M. Ali
Subject: Re: [Discuss-gnuradio] usrp_source to file_sink ... what gets written when no transmission
Date: Wed, 20 May 2009 22:23:56 -0500

Thanks Jason.

On Wed, May 20, 2009 at 10:16 AM, Jason Uher <address@hidden> wrote:
>  I don't understand why is it that the
> usrp_source writes some junk data to the file_sink even when I am not
> transmitting from the other USRP. Is it possible that it might be picking up
> some stray signals at 2.4GHz?

The USRP receiver has no idea when the transmitter is sending, all it
does it step down the signal and spread it out.  If there is nothing
there you will still get junk, especially if you are using some form
of agc which will make your amplitudes constant even if there is very
little power.

You can try to record only when the transmitter is on through
judicious use of gr.pwr_squelch_cc with the gating turned on.


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