You only have to use sudo with pybombs if you don't have write permission
to your prefix. In general it's best to avoid using sudo and pybombs
together if possible (with the exception of when pybombs asks you for sudo
password when using apt-get install). You can either set the prefix to
somewhere
Marcus, Thank you for your answer.
> a sink is typically built as a sync block, simply because it's easier
> (and still works), since you don't have to implement a general_work (and
> a forecast).
Actually, I do not override general_work() neither forecast(), but only
work(), with signature:
wor
Hi Marcus,
Thanks for your comments, as usual, you're being a life-saver (I wasn't
aware of the existence of set_command_time/clear_command_time functions,
these will be immensely helpfull). From your suggestions, I understand
that the USRP will always re-attach a rx_time tag after being re-tu
Thanks Nathan. Should I have to use sudo when using pybomb commands, now
that the installation prefix is outside of my home directory(because I now
I have to use sudo when using pybomb commands)?
Logan Washbourne
Electrical Engineering Graduate Student
(Electromagnetics)
On Mon, Aug 3, 2015 at
Thanks, Nathan, and all who replied publicly and privately,
The problem seems to be that I had installed Anaconda (from Continuum
Analytics) which does not include Cheetah by default. It does exist,
however, in the python tree installed by ubuntu, and that seemed to confuse
things. I installed C
Logan,
For your case deleting inventory.dat would do the trick of effectively
resetting pybombs state (and if your done with an install rm the prefix)
Mike,
Pybombs is hiding the true error. Cmake failed for either VOLK or GNU
Radio. Try running pybombs again with -v -v
On Monday, August 3, 201
I have users of my simple_ra application complaining of this:
Traceback (most recent call last):
File
"/usr/local/lib64/python2.7/site-packages/gnuradio/wxgui/plotter/plotter_base.py",
line 209, in _on_paint
for fcn in self._draw_fcns: fcn[1]()
File
"/usr/local/lib64/python2.7/site-pa
Mike,
When I ran into this problem, I had to reinstall pybombs. I think the problem
lies in changing the installation prefix after installing pybombs.
I'm sure there is another way to fix this, I just don't know what it is.
When I reinstalled pybombs, I defined the installation prefix when the
I use gentoo at home and have no difficulty keeping gnuradio up to date.
At work we're on a standalone network (no internet) so occasionally bring
computers home to update them. Lately, I've been having trouble with
pybombs. Using a freshly installed ubuntu 15.04, then doing an
apt-get update
Hi Tom,
I have actually added a jpg file which shows the output when given the
command of uhd_fft. Actually,my experiment is to transmit different data
packets to the receiver with minimized errors with ./benchmark_tx.py -f
2.435G and ./benchmark_rx.py -f 2.435G as commands . May I please know
Dear all,
I was able to fix the problem.
Fist I had forecast set to a big number and vector sink was unable to
provide such amount of inputs. I changed that to ninput_items_required[0]=
noutput_items, not sure if it's the correct relation thought. But the block
still didn't work.
Apparently I wa
Dear all,
I'm trying to implement a simple state machine to receive bursty data and
write it in a file.
To accomplish this I have created a general block that accepts complex
samples and has two states:
0 - Just drops data. If one of the samples is 0, go to state 1.
1 - Copy inputs to outputs.
Hi M4RL0V,
a sink is typically built as a sync block, simply because it's easier
(and still works), since you don't have to implement a general_work (and
a forecast).
So your problem here is that logically, connecting happens in the
top_block, not in the block itself; have a look at python code t
I'd like to implement a simple custom sink block in Python.
AFAIK, a sink is a 1:0 basic block, with one input port, and no output
port.
I define it as a class:
class MySink(gr.basic_block):
def __init__(self, src_block):
gr.basic_block.__init__(self, name='MySink', in_sig=[numpy.floa
On 02.08.2015 11:32, Gaddam Yamuna wrote:
> Hello,
>
> I am unable to understand the *max-carr-offset* parameter in *Channel
> Estimator block. *How this parameter help in order to receive
It effectively limits the search range, and it's specified in multiples
of integer carrier offsets. The cha
On 08/03/2015 12:35 PM, John Ackermann N8UR wrote:
It might be helpful to clarify that since this is a voltage ratio,
it's 20log rather than the 10log used for power (e.g., doubling
voltage is 6dB, doubling power is 3dB), so the scaling will look
different than a typical spectrum analyzer. (It
Below is a free (to IEEE members) tutorial on wide bandwidth signal analysis.
Let me know If you guys consider this kind of thing spam and but me being
curious always appreciate a few diversions from time to time.
We all could learn something from this I expect.
Greg
Gregory W. Ratcliff
**
I misread you question and thought you were receiving with the USRP. Same
procedure, just don't let the transmitted signal go past +/- 1.0 or you will
clip the DAC. In practice keep it backed off 6 dB or more to allow for
crest factor.
Lou
madengr wrote
> 1) Send in a CW tone from a signal
On 03.08.2015 00:18, Galiero Casay Gabriele wrote:
> - The io signatures would be defined like this:
> gr::io_signature::make(1, 1, pkt_len*sizeof(float)),
> gr::io_signature::make(1, 1, sizeof(float) * (sync_word_len +
> pkt_len)))
> To clarify a bit what I want is to add a pred
It might be helpful to clarify that since this is a voltage ratio, it's
20log rather than the 10log used for power (e.g., doubling voltage is
6dB, doubling power is 3dB), so the scaling will look different than a
typical spectrum analyzer. (It would be nice if the instrumentation
blocks could
1) Send in a CW tone from a signal generator of known power (dBm)
2) Read the level from GR FFT (dB)
3) Figure out the amount you need to offset (dB)
4) Multiply your samples by a constant value of 10**(offset_dB/20.0)
5) The GR FFT will now be calibrated to an absolute power (dBm).
Note if you c
On 08/03/2015 12:24 PM, Martin Braun wrote:
This pops up a lot, and hence earned a spot on the FAQ a while back:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-know-the-exact-voltagepower-of-my-received-input-signal
...although that section could surely be expanded.
M
I just
This pops up a lot, and hence earned a spot on the FAQ a while back:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-know-the-exact-voltagepower-of-my-received-input-signal
...although that section could surely be expanded.
M
On 03.08.2015 09:04, Marcus D. Leech wrote:
> On 08/0
On 08/03/2015 09:36 AM, Sylvain Munaut wrote:
Hi,
I was able to gather results, and I am really confused with it. I generated
a -30 dB signal based on the fft plot shown and transmitted it using a usrp.
My spectrum analyzer received a signal at -50 dBm (-80 dB) and my receiver
which also uses a
On Sat, Aug 1, 2015 at 1:52 PM, John Garrick wrote:
> Hi Tom,
> So can you please advice what I can do next for them to be right?
>
> Regards,
> John
>
Too many things; you'll have to go through it step-by-step. Best thing to
start with is to transmit and use uhd_fft at the receiver end to look
On Sat, Aug 1, 2015 at 1:41 AM, Volker Schroer wrote:
> The same error happens in the 3.7.8 release candidate.
>
> -- Volker
>
>
>
> I am trying to measure performance of my OOT module with performance
> counter and control port.
>
> When I execute a command line `gr-perf-monitorx` or `gr-ctrlpor
> I transmitted this -30 dB signal (Image 1) using a usrp: The spectrum
> analyzer displays -50 dBm (Image 2) as its reading. My receiver end picked
> up the signal with the same peak power at -30 dB (Image 3). I'm confused.
> How do I convert the dB power in the GRC to the received signal of the
>
Also ... that's just plain wrong : "-50 dBm (-80 dB)"
dB is an unit for the ratio of two things. That's it.
dBm is the ration relative to a 1 mW power.
You probably meant to say -50 dBm ( -80 dBW ) ... and the 'W' is
important, it says it's relative to 1 W.
Cheers,
Sylvain
Hi,
> I was able to gather results, and I am really confused with it. I generated
> a -30 dB signal based on the fft plot shown and transmitted it using a usrp.
> My spectrum analyzer received a signal at -50 dBm (-80 dB) and my receiver
> which also uses a usrp received the signal and plotted it
I was able to gather results, and I am really confused with it. I generated
a -30 dB signal based on the fft plot shown and transmitted it using a
usrp. My spectrum analyzer received a signal at -50 dBm (-80 dB) and my
receiver which also uses a usrp received the signal and plotted it at -30
dB. My
Hi Francois,
yes, that seems rather high; but maybe you're seeing the effects of the
DC offset removal filter. You can try to use use
set_auto_dc_offset(False) to make that faster [1].
However, usrp_spectrum_sense is pretty old, and hence can't even make
use of stream tags on the GNU Radio side a
Hi all,
I want to retune the frequency of my USRP in Python during runtime. I
understand from usrp_spectrum_sense.py that I can just retune the USRP
during runtime, and that I need to allow for some tune_delay to make sure
that the samples corresponding to the old center frequency are discarded
Hi Kevin,
I'm really happy about this! Hope you like the brave new C++ world ;)
Now, curious as I am, (and a little ashamed for not replying earlier,)
could you share your code with us?
Best regards,
Marcus
On 02.08.2015 16:46, Kevin McQuiggin wrote:
> Hi All:
>
> My previous report of lock-up
I'd also like to chip in that effective TX power is /very/ dependent on
frequency for devices that span several orders of magnitude in frequency
-- so you can't just say "the max TX power is x dBm", you need to
measure for every frequency, with every bandwidth you use, for the
specific signals you
Hi, I have been struggling a bit trying to code a block that accept for example
vectors of sync_len*sizeof(float) as input signature and outputs vectors of
(sync_len+pkt_len)*sizeof(float) as output signature.
To understand how blocks handling vectors work, I tried to make the same block
I did
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