Hi, I have read this information regarding the USRP ADC
"The full range on the ADCs is 2V peak to peak, and the input is 50 ohms
differential. This is equates to 40mW, or 16dBm."
Please may someone enlighten me, how the 40mW and 16dBm values were
calculated?
thanks
I am using two TVRx modules on the same motherboard to write a 1 second
sample every minute for 30mins. theoretically I should have 60 sample sets,
collectively.
I am able to write the first sample set succesfully but all writes after
that fail!
Please take a moment to look at what I may be doing
For anyone with a similar predicament, the sillyness lies in tuning the
second tuner to the incorrect channel.
Fix this and you'll be on your way.
Aadil
>
>
> Hi,
>
> I am trying to use 1 USRP with two TVRx daughter boards to capture
> Separate
> FM signals and write them to file.
>
> I get a no
Hi,
I am trying to use 1 USRP with two TVRx daughter boards to capture Separate
FM signals and write them to file.
I get a noisy signal. I hope someone can tell me what i've done wrong. I
can't see the error.
I have included the code that i'm using. it's built from the
usrp_rx_cfile.py
-
Hi,
I would like to measure the actual signal that is output from the module and
subsequently input into the ADC.
After looking through the module Datasheet im still not entirely sure which
pins I ought to probe in order to extract this measurement.
I think it may be pins 1 and 2, but am not cer
Hi,
I've noticed the increased interest in running GnuRadio and the USRP with
the PS3 as the computing platform.
My naive thought is that this is to explore the performance of the cell
processor architecture.
Would someone be willing to offer me their thoughts on this choice and what
are the pro
Hi Pierre,
As far as I understand the TVRx board has two AGC stages: An RF and IF AGC.
Look in this file: (gnuradio-3.1.1/gr-usrp/src/db_tv_rx.py) to see how
GnuRadio models the gain characteristics in the data sheet and subsequently
sets the appropriate registers.
Here you will note that the PGA
Hi Patrick,
Thank you for replying my msg:
when I say "play" I mean outputting the file to the audio sink.
The scripts and sample file can be found here:
http://rrsg.ee.uct.ac.za/members/aadil/
I've realised my calculation does not make sense.
The 1 000 000 are written at quad rate of 320KSps w
Hi George,
Thank you for your response, you've cleared up some confusion on my part.
Secondly Is anyone able to tell me where i've gone wrong with the calculation I
mentioned in my third question?
3)If my file is 1 000 000 samples and my audio rate is 32KHz (I
understand this to be 32K samples
Hi,
I have modified the usrp_wfm_rc.py script to capture samples of an FM
signal and write them to disk, and a second script to demodulate and
playback the samples.
The scripts are available here: http://rrsg.ee.uct.ac.za/members/aadil/
I have 3 questions:
1) 1 000 000 samples writes a file 8 0
> Also, it's not clear to me what you're actually trying to do.
I'd like to capture FM signals and perform ambiguity measurements on them.
at the moment, i am failing to capture data correctly.
If you want to plot data in real time, please use either the
> usrp_fft.py or usrp_oscope.py applica
Thanks for responding and for your input, I answer your questions below,
>You're transmitting a 250kHz square source which is the summation of all
odd harmonics of >250kHz. I believe that is why you were told to switch
over to a sine wave which you would >probably just see a single tone.
I have
Ok,
I still have the problem with the reconstruction though.
When I perform the FFT on the sample set, the plots are not as you would
expect for a pure 250KHz signal?
This is the major concern for me and the crux of my problem.
___
Discuss-gnuradio mai
It seems I need to hit return after i've entered the values, my error.
the new plot is on the website:
https://rrsg.ee.uct.ac.za/members/aadil/
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnur
ut signal level is ok.The scope pictures was not generated by
> usrp_oscope.py. What is the program used to generate it ? Test The signal
> with usrp_oscope.py
>
> Firas
>
> *Aadil Volkwin <[EMAIL PROTECTED]>* wrote:
>
> Hi,
>
> I've updated the scope screens
ut signal level is set at -16.02dBm
Aadil
On 10/11/2007, Firas abbas <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> Use center frequency =0 in the usrp scope. If you use center frequency =
> 250K, you will shift the signal to 0 Hz.
>
> What is your signal input level in dBm ?
>
Hi,
Firstly my apologies for posting known quantities, I guessed that members
would like to see in what way I tinkered with usrp_rx_cfile.py. point taken
though.
Screen shots of the MATLAB plots as well as the usrp_oscop.py output can be
found at:
https://rrsg.ee.uct.ac.za/members/aadil/
I'm pr
Hi,
I've been bashing my head for a couple of days on what should be a trivial
process.
I would really appreciate it if somebody could please come to my rescue.
I'd like to digitise a signal, intented to be off air FM signal, but for the
moment, i'm capturing a 50KHz sinusiod and doing the recons
Hi,
I intend using the USRP and the TVRX module to recieve FM transmissions, and
at this stage digitise the recieved signal and perform the ambiguity
measurement on the digitised data in order to produce, doppler, range and
amplitude maps.
Does GnuRadio have modules that will perform these functi
Hi again,
I found my error.
im sorry, ive realised I was being silly... its been a long a day.
I cant believe its taken me as long as it has to figure that one out.
regards,
Aadil
> Message: 6
> Date: Wed, 1 Aug 2007 13:47:55 +0200 (SAST)
> From: "Aadil Volkwin" <[EMAIL
Hi,
when running this file, tvrx_total_power.py (attached) I run into the
following problem, output shown below, and the pc hangs. I have not
encountered this previously and am at a loss.
other usrp related examples from the examples folder do run.
I would appreciate some advice if you have any id
Hi,
I'm doing some tests on the microtune 4937 DI5 RF TUNER MODULE (3x7702) to
determine the modules gain sensitivity.
Essentially, i'd like to reproduce the IF AGC and RF AGC graphs, shown in
the modules datasheet.
I intend on using the _set_rfagc and _set_ifagc methods in the db_tv_rx.py
modul
Hi Ziad,
Thanks for your help, it worked.
However, Is this something that I must do each time I restart, as I did
previously do this step, as suggested in the Installation instructions on
the gnuradio website.
thanks again,
Aadil
> Message: 5
> Date: Mon, 2 Jul 2007 13:18:21 -0700 (PDT)
> Fro
Hi,
I'm having trouble with the installation of gnu radio on my laptop (acer
travelmate 230series).
I'm running ubuntu Edgy and have installed all the neccessary packages via
Synaptic package manager.
The following is the output once I try to run one of the example programs,
[EMAIL PROTECTED]:~
Hi,
i'd like to do spectral smoothing on an FFT in real time through
GNU_RADIO.
Is there a function that will allow me to do this in the GNU_RADIO
modules?
If not has anyone attempted it before, or have any suggestions as to how
I should go about implementing it myself.
Perhaps any ideas of cas
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