Just to follow up, have you tried using the auto calibration of the IQ
channel released recently?
As far as we can discern, this might give you a good deal of reduction in
the problematic spurious frequencies.
Also by using manual tuning where the daughterboard tuning is at least 12.5
kHz away (fo
Hi Nick
Thank you for looking into this.
2011/11/26 Nick Foster
> On Thu, Nov 24, 2011 at 5:59 AM, Paul M. Bendixen
> wrote:
> > Hi again
> > Thank you very much, we expect our thesis will be available from some
> time
> > next year, we will add it to the academic section.
> >
> > The work we
On Thu, Nov 24, 2011 at 5:59 AM, Paul M. Bendixen
wrote:
> Hi again
> Thank you very much, we expect our thesis will be available from some time
> next year, we will add it to the academic section.
>
> The work we have done so far have pointed us to the daughterboard mixer.
> All mixers have probl
Hi again
Thank you very much, we expect our thesis will be available from some time
next year, we will add it to the academic section.
The work we have done so far have pointed us to the daughterboard mixer.
All mixers have problems causing harmonics, and our research so far has
shown us that this
Hey guys, sorry for the extremely late response. Although identifying and
solving USRP problems is great, our focus lies in the project at hand.
That being said, the responses on here were great. We tried scaling the
input signal magnitude and it actually worked very well. The perplexing
thing,
>
>
> 2011/10/27 Marcus D. Leech mailto:mle...@ripnet.com>>
>
>>
>> Well, that sounds like the lazy solution, intermodulation
>> products are bad, so just throwing the transmitter power away is
>> not what I'd prefer.
>>
> But what it points to is an *analog* issue, entirely
2011/10/27 Marcus D. Leech
>
> Well, that sounds like the lazy solution, intermodulation products are
> bad, so just throwing the transmitter power away is not what I'd prefer.
>
>
> But what it points to is an *analog* issue, entirely independant of the
> CORDIC (which, as I observe, isn't like
I'll refer the list to this:
http://gnuradio.org/redmine/attachments/download/249/02-ettus-practical-radios.pdf
Which gives a decent overview of the issues that happen at the interface between the
digital world of "perfection", and the
horrible, capricious, analog world beyond the DAC.
--
Well, that sounds like the lazy solution, intermodulation products are
bad, so just throwing the transmitter power away is not what I'd prefer.
But what it points to is an *analog* issue, entirely independant of the
CORDIC (which, as I observe, isn't likely involved in the test cases
at hand
Hello
2011/10/27 Marcus D. Leech
> The attached two_tone flow-graph shows that close-in intermod products
are sensitive to overall
signal magnitude settings. Keep the digitla signal magnitudes lower,
and the intermod products are
quite well suppressed. The flow-graph is setup for
On 27/10/11 03:42 AM, Paul M. Bendixen wrote:
> Hello to you too
>
> At our university we have seen this behaviour as well.
> Our setup is a USRP N210 with a 2400 daughterboard into a Rhode &
> Swartz spectrum analyzer.
> We also get these sidelobes, and if you trawl the archives, you will
> find o
Hello to you too
At our university we have seen this behaviour as well.
Our setup is a USRP N210 with a 2400 daughterboard into a Rhode & Swartz
spectrum analyzer.
We also get these sidelobes, and if you trawl the archives, you will find
others have as well.
Currently we are working on a theory t
Hello all:
We have been working on an APCO P25 project at my university, and are
fortunate enough to have 4 USRP N210's all equipped with the WBX boards.
As the project has progressed we have accomplished many of our goals.
However, one thing that has haunted us throughout the entire project is
Hello all:
We have been working on an APCO P25 project at my university, and are
fortunate enough to have 4 USRP N210's all equipped with the WBX boards.
As the project has progressed we have accomplished many of our goals.
However, one thing that has haunted us throughout the entire project is
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