[Discuss-gnuradio] Confusion with uhd_fft.py with usrp2

[sumitstop]

Today I ran uhd_fft.py in two usrp and two usrp2.They were in the same room
and placed at a distance of 2-3 meters from each other(approx) but there was
much difference in the fft.

Actually there was a peak at 2.432G . Both usrp detected well but there was
some confusing display from usrp2 under uhd_fft.py. usrp2s also detected the
peak but there was a significant rise on the left side in both the usrp2.I
checked with RFX2400 and XCVR2450 both.

                                           Here is the fft for both usrp2
under uhd_fft.py

http://old.nabble.com/file/p32438830/usrp2_1.png 

                                                Also in the figure below 
its detecting two peaks.

http://old.nabble.com/file/p32438830/usrp2_2.png  

                                                     Also sometimes it went
like this 

http://old.nabble.com/file/p32438830/usrp2_2_1.png 


At the same time the display from usrp under usrp_fft.py was perfect.
I am using RFX2400 as well as XCVR2450. Although there is some problem with
the second usrp.Despite of elevating the gain and changing the positions the
peak is not getting sharp and high. :) 

http://old.nabble.com/file/p32438830/usrp_1.png 

http://old.nabble.com/file/p32438830/usrp_1_2.png 

What may be the reason.... Placement of the usrp's or some hardware fault ?





-----
Sumit Kr.
Research Assistant
Communication Research center
IIIT Hyderabad
India
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