ILKYOUNG KWOUN wrote:
Guys,
I managed another comparison test last night.
http://zoolu.co.kr/episodes/6
Just to follow up on this a little more, if you generate a complex sine
wave in octave or Matlab, quantize it to 16 bits, and then plot the fft,
you will see similar behavior.
Matt
You are correct about the fft level not scaling with fft size. I
remember putting this in some time ago, but it isn't there now, so I
don't know what happened. In any case, I did some further analysis on
the spurs. We are seeing 2 different things on the USRP1 and USRP2
The USRP1 definit
Guys,
I managed another comparison test last night.
http://zoolu.co.kr/episodes/6
*. Test tone signal quality
I used a siggen as good as I could get. :-) According to the
spectrum analyzer, it seemed that the siggen did not generate any
noticeable harmonics(1st and 2nd pictures). Actually, I
Thank you so much, guys.
I will setup another experiment regarding your advices and post the
result. Since I have to arange my friend's lab, I probably could do it
on weekends. :-)
Best regards,
Ilkyoung.
___
Discuss-gnuradio mailing list
Discuss-gn
ILKYOUNG KWOUN wrote:
Hi, folks,
I recently did some comparison test with my USRP and USRP2 boxes and
got slightly different results.
Test setup
- Signal source : HP signal generator (forgot the name of the equipment)
- Daughter cards for USRP and USRP2 : BasicRX
- Test configuration
: I divid
. and Don't forget to reduce input signal level. I see distortion in your
graphs. Use -20dBm as input signal level.
Regards,
Firas
--
View this message in context:
http://www.nabble.com/USRP-and-USRP2-FFT-result-comparison-analysis-help-tp21438485p21441059.html
Sent from the GnuRadio maili
Hi,
1) The comparison is not fair with these decimation values. For USRP2, you used
a decimation of 25. Using this odd decimation will disable the FIR filters of
the USRP2 FPGA.
2) To make the comparison valid, I suggest for you to use decimation of 64 for
USRP and decimation of 100 for USRP2.
Hi, folks,
I recently did some comparison test with my USRP and USRP2 boxes and
got slightly different results.
Test setup
- Signal source : HP signal generator (forgot the name of the equipment)
- Daughter cards for USRP and USRP2 : BasicRX
- Test configuration
: I divided a 12.1MHz CW signal f
