[Discuss-gnuradio] TX characterisation of USRPN210 with SBX daughterboard

[Gayathri Ramasubramanian]

Hi,

I am trying to characterize the TX and RX characteristics of USRPN210 with a
SBX board.
I have tried one test : Amplitude Variation effects, by varying the
amplitude in steps and finding out the o/p power through spectrum analyser.
The foll are the readings I got.
Amplitude level 921.25 MHz      2.45625 GHz
0.0625  -49.18  -60.97
0.125   -43.2   -55.05
0.25    -37.25  -49.09
0.5     -31.24  -43.05
1       -25.38  -37.13
Amplitude change        921MHz  2.456GHz
1 to 0.5        5.86    5.92
0.5 to 0.25     6.01    6.04
0.25 to 0.125   5.95    5.96
0.125 to 0.0625 5.98    5.92
 
when i ploted the graph in excel, (O/p power Vs amplitude), i got two almost
linear curves, but their was a big difference in the 2 lines @ 921.25 MHz
and 2.45625 GHz (as seen above) at the start and if extrapolated could
converge at a higher ampl and o/p power.
I was not sure about my results and was looking to see if some one could let
me know if these values look within the normal expected behaviour? if not,
please let me know what is the normal expected behaviour.
I am new to USRP and GRC programming and doing this for a project. 
<http://gnuradio.4.n7.nabble.com/file/n47157/Oppower_vs_ampli.png> 


Thanks in advance



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