Ed,
Your response is useful, but I too am curious about where to find some
documentation regarding the correlator block.
1) I can look at the source code for gr_simple_correlator, and see that it
is a "finite state machine", but I have no idea what the block is doing in
each of the states. I lo
Hi,
During my tests with DBSRX board, I noticed that using the same Local
Oscillator offset tick (by 4MHz) used with the RFX boards in the dbsrx
board, enhanced the dbsrx SFDR by about 14 dB as shown in the following
figures :
http://rapidshare.com/files/79323579/dbsrx.tar.gz
I used 1000.25 MHz
Michael Dickens wrote:
I'm trying to get 'gr-qtgui' to work on OSX (10.4, but doesn't really
matter), and have finally figured out that I need QT 3 (not 4, at
least on OSX the way QT4 gets installed, even though the .m4 script
looks for >= 3.3) and QWT 4 or 5 paired with it (qwt 5.0.2 is the
I'm trying to get 'gr-qtgui' to work on OSX (10.4, but doesn't really
matter), and have finally figured out that I need QT 3 (not 4, at
least on OSX the way QT4 gets installed, even though the .m4 script
looks for >= 3.3) and QWT 4 or 5 paired with it (qwt 5.0.2 is the
latest, so I'm using
Jens Elsner wrote:
I noticed that (with gain 52) the USRP goes into saturation above -50
dBm and does not quite show linear behaviour below -100 dBm.
Not sure what you mean above. With gain of 52, the system gain is
pretty high. For a strong signal like -50dBm you would want to have
Matt,
thanks for your reply.
> >Using a noise generator, I came up with the following figures:
> >
> >USRP settings: DBSRX, gain 52, decimation factor 32
> >Calibration bandwidth: 190 kHz around center frequency, 3dBm cable loss
> >accounted for
> >
>
> That's a lot of cable loss. Are you s
Replying a bit late here...
Jens Elsner wrote:
As Eric Matlis a while ago (see link to thread at the bottom), I would
like to calibrate my USRP/DBSRX combination for measurements. As noted,
the USRP is not a measurement device, but nevertheless I'd like to give
it a try. My application are GPS
Hi Firas,
yes, it's only somewhat related. I posted a question about the USRP
dynamic range a while ago (see link below) but didn't get a response.
Maybe you can comment on it.
The algorithm I used to calculate the figure on the Y axis was the sum
over an estimate of the power spectrum density.
Hi,
I think we are trying to do something different. We are trying to
investigate the possibility of increasing USRP dynamic range by modifying
some USRP FPGA stages.
By the way, what was the equation used to calculate the ADC output in dB in
you graph?
Firas
Jens Elsner wrote:
>
> I noticed
I noticed the discussion about the USRP dynamic range.
A while ago I made some measurements with a noise generator to calibrate
the USRP with a DBSRX daughterboard.
The resulting graph is attached.
Settings: room temperature, USRP, DBSRX, 2 MHz measurement bandwidth at
940 MHz center frequency,
Hi Eric
> Eric Blossom <[EMAIL PROTECTED]> wrote:
>
> I believe that Matt was referring to using max-strength I & Q inputs
> to the Basic Rx along with an Rx mux setting that routes both ADC
> outputs into the same DDC. (The default config with the Basic Rx
> feeds a constant zero into the Q DDC
On Wed, Dec 26, 2007 at 01:56:46AM -0800, Firas Abbas wrote:
> > I agree that the results do look better. My concern is overflow when
> > both I and Q are used. If you can try all of these with max-strength
> > signals on both I and Q at the same time, I would be more than happy to
> > incl
Hi Matt,
Kindly, see my comments below:
> Matt Ettus <[EMAIL PROTECTED]> wrote:
>
> Firas,
>
> Thanks for doing these tests. See my comments inline.
> Hi Matt, Don
>
> I did the tests. We definitely have improvement in USRP SFDR by more
> than 3 dB. I did the tests as follows :
>
> 1)
Firas,
Thanks for doing these tests. See my comments inline.
Firas Abbas wrote:
Hi Matt, Don
I did the tests. We definitely have improvement in USRP SFDR by more
than 3 dB. I did the tests as follows :
1) Test Setup:
a) Using USRP Rev 4.5 with Basic-RX board.
b) Using high accuracy fun
Hi Matt, Don
I did the tests. We definitely have improvement in USRP SFDR by more than 3 dB.
I did the tests as follows :
1) Test Setup:
a) Using USRP Rev 4.5 with Basic-RX board.
b) Using high accuracy function generator.
c) Using decimation rate =8, and gain =0.
d) Using single tone (The SF
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