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

[isaacgerg]

Eric,
  I pulled GNU Radio from the SVN repository no more than 3 months ago. 
What do you mean the FPGA had a flipping problem? Wouldnt this affect my
USRP hardware or does the GNU Radio code correct for it?

Isaac



Eric Blossom wrote:
> 
> On Mon, Jul 28, 2008 at 11:34:01AM -0700, isaacgerg wrote:
>> 
>> Eric,
>>   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.
> 
> 
> Sorry, not the board, the GNU Radio software you're running on the host.
> 
> There was a problem in the FPGA code that was fixed quite a while
> ago (6 or 9 months) where there was some kind of flipping.
> 
> 
>> >> 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.
>> 
>> Isaac
> 
> Eric
> 
> 
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