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Re: [Discuss-gnuradio] Possible residual carrier not reported correctly

From: isaacgerg
Subject: Re: [Discuss-gnuradio] Possible residual carrier not reported correctly
Date: Mon, 28 Jul 2008 11:34:01 -0700 (PDT)

  I have answered you questions inline:

>>Are you seeing any over or underruns ("uOuO" or "uUuU") on the console?
  Occasionally, I see "u0" on the rx. But, even if i post process data
offline, i still get the "flip"

>> How wide is the signal you're trying to send?
  The rx interp is 256 and the tx interp is 512 giving a BW=250Khz.  Since I
am just sending random samples, I am using the whole band.

>> What interpolation and decimation values are you using?
  See above.

>> Try sending it at 10MHz.
  I did.  The Rx cannot see my signal anymore; a PSD confirms this.  Not
sure why.. maybe an antenna issue. 

>> What version of GNU Radio are you using?
  I do not know what version the radios are. How do i find this out? The
serial numbers are 1460 and 1461 and there is a date on the sticker that
says 4/16/07.

>> Have you isolated the problem to the Tx or Rx path?
  I believe it is in the Rx path.  The TX path simply reads up a data file
of samples and sends them to the USRP... very simple.  The RX path receives
the data and attempts to correlate on the samples I sent.  However, I am
noticing that the correlation is postive, then negative, and continues this
way alternating about every 1000 samples or so.


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