Hi Ron
Sorry about that. Please find attached the modified graph.
The two curves seems more consistent in this graph.
I am assuming the DAC should have reached saturation at Ampl =1. However my
reading don't seem to depict that so well.
Would it have been better to started at such lower values of Amplitude?
I understand for a SBX board, the Tx'd o/p power range is +16 -20 dbm ( 1.5
to 2.2 V) with a 32 dB gain control range, which I understand that I can
vary the Tx'd power from -16 dBm to +16 dBm (0.035 V ~ 1.5 V). Is my
understanding correct?. So should I vary my ampltude from 0.035 V untl 1.5
V? is that within the usrpN210's working levels?
Thanks
On Mon, Mar 24, 2014 at 3:48 PM, Ron Economos [via GnuRadio] <
ml-node+s4n47165...@n7.nabble.com> wrote:
> The graph doesn't match your numbers.
>
> Ron
>
> On 3/23/2014 8:56 PM, Gayathri Ramasubramanian wrote:
>
> > 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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