I installed GNU Radio on a ThinkPad Lenovo T4410 under Ubuntu 10.04.
After connecting the USRP2 with the original Ettus code on the SD card D and
F LEDs are ok and when executed:
~$ sudo find_usrps
No USRP2 found.
I run wireshark or tcpdump to see what happens in my network and I got:
~$ sudo fi
ernet wire.
Furthermore there were no errors during the installation of the
software (via package manager).I run out of ideasany suggestion?
Jorge.
On 09/07/2010 04:43 AM, Jorge Miguel wrote:
> I installed GNU Radio on a ThinkPad Lenovo T4410 under Ubuntu 10.04.
> After connecting th
raw ethernet interface.
>--
>Marcus Leech
>Principal Investigator
>Shirleys Bay Radio Astronomy Consortium
>http://www.sbrac.org
>>On 09/07/2010 03:12 PM, Jorge Miguel wrote:
>> Thanks for your quick answer. A problem with a firewall was an idea
>> that also came to my mind
usrps
>> 00:50:c2:85:35:a2 hw_rev = 0x0400
>>
>> If I stop the sniffer, I get again:
>>
>> ~$ sudo find_usrps
>> No USRP2 found.
>>
>> My problem is that 'find_usrps' only works when a sniffer is running.
>> How can it be explained?
>
Hello,
After running my USRP2 with the GRC software I got some results that I
didn't expect. My configuration was is simple as an USRP2 source followed by
a FFT sink to see the spectrum (around MHz with a 75cm antenna), but:
1) I can only see the sprectrum up to 100MHz. I thought that the LTC2284
After running the USRP2 GNU Radio example "usrp2_wfm_rcv.py" I got an error
which I cannot find the solution in internet, any ideas?
Many thanks in advance.
Jorge.
u...@user:/usr/share/gnuradio/examples/usrp2$ ./usrp2_wfm_rcv.py
Using RX d'board 0x0001
gr_remez: band edges must be nondecreasing
Tr
Hello community!
I initiated myself in GNU radio two weeks ago and I am learning as fast as I
can. To begin with, I decided to play with GRC and my URSP2.
I successfully built a FM modulator that works fine.
I successfully built a FM demodulator that works fine.
But there are still several things
This is my grc generated file. It is probably that now the sample rates are
not adjusted because I tried everything to make my receiver work.
I would appreciate any help. I remind you that modulator and demodulator
work when they are alone but they don't when running together.
Many thanks,
Jorge.
I forgot to mention, but I get a lot of messages like:
.SSS
SSaUSSS.
I did the calculations and with the 104 interpolation USRP sink and 208
decimatio
Hi all!
I am Tx/Rx a FM signal at the same time, but I can see a lot of S
messages that mean my CPU cannot keep up with all frames generated by the
USRP2 and drop most of them.
However I have a quite new laptop with a CPU:Intel(R) Core(TM) i5 CPU
M 520 @ 2.40GHz on Ubuntu 10.4
I guess that
>* *CPU scheduling is generally the responsibility of the operating system
>* *kernel, *NOT* Gnu Radio. What Gnu Radio does is schedule
> blocks to threads, and the execution of those threads, and CPU
> assignment is up to the kernel. In general, the kernel does a good
> job of CPU scheduling.
>
't work neither.
Could be any reason why by decreasing software computation (and Ethernet
traffic as well) in the transmitter path affects the performance of the RX
path?
Many thanks,
Jorge.
On 28 September 2010 05:43, Eric Blossom wrote:
> On Mon, Sep 27, 2010 at 10:07:07AM +0200, Jor
oth of them when running alone work. That is the fact I
do not understand.
Regards,
Jorge.
On 2 October 2010 17:03, Tom Rondeau wrote:
> On Thu, Sep 30, 2010 at 5:52 AM, Jorge Miguel wrote:
> > Hi !
> >
> > Eric, thanks for your advise. Some results here.
> >
> &
Hi all!,
I am going to measure both parameters, noise figure and phase noise of my
USRP2+XCVR2450 transceiver.
After some reading about different methods of measuring them I have some
questions.
Phase noise.
I read that in the lack of a Signal Source Analyzer (SSA) the most spread
method of measu
Hi all!
I post a problem I had when transmitting and receiving a FM signal at the
same time.
I did a much simpler experiment (transmitting a sine wave) at 60MHz and make
an FFT of the received spectrum.
Unfortunately I faced the same problem. Lots and lots of dropped frames that
affects the recei
Hi everybody!
I read a lot of posts about XCVR2450 and I am still confused about its
performance.
I would like to set up a pulse doppler radar application around 2.4 GHz with
USRP2 + XCVR2450
My simple questions are:
Does XCVR2450 work in full duplex mode?
If yes: Does anybody know the isolation
most of the time of my unambiguous radar range waiting to the system
to switch to reception mode.
Many thanks,
Jorge.
On 11 October 2010 20:05, Jason Abele wrote:
> On Mon, Oct 11, 2010 at 10:34 AM, Jorge Miguel wrote:
> > My simple questions are:
> > Does XCVR2450 work in f
Dear all,
I am trying to understand why my Lissajous plot between two cosine signals
is not stable.
I transmit a cosine signal with the basic tx. I receive the signal with the
basic rx. Interpolation and decimation rates are 500 in both cases.
What I get is an ellipse (that means that frequency
Hello all,
I did some test when transmitting and receiving a pulse. After seeing the
transmitted and received signal on a single oscilloscope (in GRC).
Flowgraph:
Vector source - Oscilloscope A - Rational resampler - USRP2 sink (500
interpolation)
USRP2 source (500 decimation) - Rational resample
Hi,
Now it is clear enough that the XCVR2450 is not full duplex.
The question I asked in my first post in the case it is not full duplex is
still unknown for me.
How long does it take to the board to switch from transmission mode to
reception mode?
In the data sheet I can read a picture called "
Hi,
I wonder if it is possible to switch between TX and RX on XCVR2450 using GRC
(in the same workflow).
If not, what is the easiest way to achieve it?
I would like to build an application that transmits a signal and then
switchs to reception. Afterwards it has to switch to TX again and so on.
M
Hi Kuntal,
I´m afraid the XCVR2450 does not allow full duplex working mode. So I need
to enable tx, then disable transmission and enable reception.
Is it possible in GRC?
If nothow is it possible?
Many thanks!
Jorge.
On 17 October 2010 20:26, Kuntal Ray wrote:
>
> Hi Jorge,
>
> You can us
Hello all,
Does anybody knows why I get this error when trying to execute the card
burner tool?
$ python usrp2_card_burner_gui.py
File "usrp2_card_burner_gui.py", line 1
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
^
SyntaxError: invalid syntax
Many thanks,
Jorge.
__
Hi,
I am trying to find out the dynamic range of the system USRP2-XCVR2450.
Looking at the schematics it seems there isn't automatic gain control in the
whole RF chain, Isn't it?
Thus the dynamic range of the system would be the ADC dynamic range, which
is 2 volts
Am I right?
Cheers,
Jorge.
___
Hello,
I burned in my SD card the UDP FPGA image and the FIRMWARE of basic tx and
rx for UDP
http://code.ettus.com/redmine/ettus/attachments/74
http://ettus.com/u2bin/txrx_udp_20100507.bin
After powering the USRP2, only the two leds of Image and FPGA and on, which
is fine.
My feeling was that I
^14))^2]/Rin) + 72.4 dB = Maximun input power
Am I right?
Many thanks,
Jorge
On 19 October 2010 19:18, Marcus D. Leech wrote:
> On 10/19/2010 12:21 PM, Jorge Miguel wrote:
>
> Hi Marcus!
>
> How do you get the 85 dB value? Is the Intermodulation distorsion of the
> page 3 ADC
2*N + 1.76)
There is something I miss..grr !
Many thanks.
Jorge.
On 24 October 2010 19:57, Marcus D. Leech wrote:
> On 10/24/2010 01:07 PM, Jorge Miguel wrote:
> > Hello,
> >
> > I am trying to find out the minimum/maximun input power of the ADC
> > LTC2284.
>
HI,
I wonder if the red Leds of the XCVR2450 have any meaning.
Many thanks,
Jorge
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Hello,
I would like to know how the gain setting (up to 92 dB in Rx mode) of the
MAXIM2829 is sorted between the two amplifiers placed around the mixer.
I is clear in the data sheet what the total gain is depending on the gain
settings but it is not clear where the gain is. Most of them can be be
Hello,
I will rephrase former question.
When using the XCVR2450, up to 92dB gain in rx mode is allowed.
However this gain is shared between to places. Gain at RF and then gain at
baseband (after the mixing)
It is very important (from the point of view of the Noise Figure) how gain
is shared.
The
ric Blossom wrote:
> > On Mon, Nov 01, 2010 at 05:36:35PM +0100, Jorge Miguel wrote:
> >> Hello,
> >>
> >> I will rephrase former question.
> >
> > Jorge, I don't know the answer to your question, but I do that the
> > answer is in the source cod
Hi,
I have an easy question.
When I use my basic T/Rx daughterboards I can tune the receiver to an
specific frequency. Since the basic T/Rx doesn't have any LO, I would like
to know where is physically that LO in the USRP2 motherboard. I cannot find
anything in the schematics. Where is it? Is that
Hi,
I can see that the XCVR2450 allows to set a TX gain from 0dB to 30dB.
I see in the XCVR2450 schematics that in the TX path path there is a
MAXIM2829 chip (which has a programmable TX gain register from 0 to 64
value) and then a power amplifier which amplifies 25-30dB (depending on the
frequen
Dear all,
I would like to build an application that:
Between T0 and T1: Transmit my wave
Between T2 and T3: Receive data
Between T4 and T5 Transmit my wave
Between T6 and T7 Receive data
Where Tx should be totally defined and controlled (from the minimum possible
value to any other value)
H
Hi people,
Can anybody give me his/her impression about my problem detailed bellow?
I would really appreciate it
Regards,
Jorge
On 6 December 2010 21:17, Jorge Miguel wrote:
> Dear all,
>
> I would like to build an application that:
>
> Between T0 and T1: Transmit my wave
>
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