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Hi Andrew,
just a quick heads-up: I nearly missed your message because it was
hidden in another thread, since you seem to have hit reply and changed
subject and text; however, my mail client recognized the In-Reply-To
header, and sorted you in - pleas
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Hi Tom,
> Have been trying to write a block in Python. Did not use the
> modtool.py, since my understanding is it may not yet support that.
Luckily, you're wrong.
gr_modtool -l python add
works like a charm.
> The block has only one output, no input
Looking for an explanation,
File Source -> GMSK MOD -> GMSK Demod -> Head Block -> File sinks
Works fine, terminates after x number of bytes have been transferred and
returns.
However:
File Source -> Packet Encoder -> GMSK MOD -> GMSK Demod -> Packet Decoder
-> File sinks
Does not return afte
Hi all,
Thanks! I'll give it a try once I get a LHCP antenna.
Best regards,
Cheng Chi
On Thu, Jan 30, 2014 at 6:58 AM, Vanush Vaswani wrote:
> The polarisation loss in your case might be 30 dB. Have a look into that.
>
> Regards,
> Vanush
>
> On Wed, Jan 29, 2014 at 7:45 PM, Sylvain Munaut <2
Hi Nick,
Thanks.
Is it possible to treat the start of the save samples as time 0, then
timestamp following packets accordingly? Well, if not, I think it would be
a good feature to be added in the future.
Best regards,
Cheng Chi
On Thu, Jan 30, 2014 at 12:58 AM, Nick Foster wrote:
> Oh! Of co
On 01/29/2014 07:24 PM, Jordan Johnson wrote:
I am attempting to translate a 20khz DRM signal from its default spot
of 10khz, to 120khz. The Frequency Xiating FIR does this just fine but
it also decimates the signal--which I do not want. I want to pass the
float input as a float until the final
I am attempting to translate a 20khz DRM signal from its default spot of
10khz, to 120khz. The Frequency Xiating FIR does this just fine but it
also decimates
the signal--which I do not want. I want to pass the float input as a float
until the final stage at the BlaeRF as my FM transmitter is an al
Ads-b uses a 1 MHz pulse position modulation scheme
Is this possible to create on gnu ?
Is it the data rate that makes the spectrum wide ? 7 MHz ?
Also thinking about a b200 usrp looks nice
Andrew vk4tec
Sent from my iPhone
> On 29 Jan 2014, at 10:29 pm, Marcus Müller wrote:
>
> -BEG
Have been trying to write a block in Python. Did not use the modtool.py, since
my understanding is it may not yet support that.
The block has only one output, no inputs. Also wrote the corresponding XML
file. the block shows up correctly in GRC when I select it and add it to the
flowgraph.
The polarisation loss in your case might be 30 dB. Have a look into that.
Regards,
Vanush
On Wed, Jan 29, 2014 at 7:45 PM, Sylvain Munaut <246...@gmail.com> wrote:
> Hi,
>
>> I am trying to collect signal from Thuraya-3. Here is the setup I used:
>> - USRP N210 + WBX
>> - LNA with 30dB gain (ZHL-
Dear All,
Here's a little update:
Changing GR_FIXED_BUFFER_SIZE from 32k to 128k solved the problem, but at
the cost of quite a slowdown.
The problem was, in hindsight, quite obvious. Not a bug, most definitely.
My OFDM implementation just needed way too much memory.
Thanks, and happy hacking t
Hi David,
you could consider to tweak the latency [1] of your system between host and
USRP. This way your relay is less dependent on that and you can reduce the
gaps between packets if the host side signal processing can keep up.
If you increase the packet size of your OFDM system you might also c
Hi Martin, and all,
I am making good progress with the relay.
At the source, I transmit packets interspersed with 0's to create a silent
period. This is achieved using vector_insert. Perhaps there are better ways,
but it works well. Currently the gap is 20ms (2e4 samples at 1e6Ms/s) between
tx
Hi all guys,
this two lines of code sort of doesn't work as I expect.
self.channel_filter = gr.fir_filter_ccf(1, firdes.low_pass(10, samp_rate,
8, 5000, firdes.WIN_HAMMING, 6.76))
print self.channel_filter.taps(), self.channel_filter
I use 3.6.5.1 version and the only thing I get is empty t
Thank you Tom. The problem is that in the configuration that is attached
delay must be arround 600 in order to allign two paths. Next I put a
complex delay block in the second path just after the theottle (and removed
the existing one) and it works fine with 330 (not perfectly alligned but
ok). Is
Andrew,
Try again with the latest version - this should be fixed now
-Tim
On 01/29/2014 12:21 PM, Andrew Back wrote:
Hello,
I tried adding a recipe to PyBOMBS for UHD-Fairwaves, setting
gitbranch to "fairwaves/umtrx". However, when I run install,
"fairwaves" is stripped from the branch hierar
Hi there,
I am having the following problem:
I create a simple hier block in grc and one of the outputs is
a message. I added an output pad with message port, but I see two issues:
1) the colour of the pad connection is not exactly the same as the message
connection (maybe this implies something
Dear All,
I am running OFDM TX-RX in GRC. The parameters used are very similar to
those in the TXRX example, with a few differences:
- FFT size changed to 1024
- Pilots aren't placed on fixed subcarriers on every symbol index. Every
third symbol index has pilots.
- I've updated sync_word1, sync_w
Hello,
I tried adding a recipe to PyBOMBS for UHD-Fairwaves, setting
gitbranch to "fairwaves/umtrx". However, when I run install,
"fairwaves" is stripped from the branch hierarchy and so it fails
since there is no branch called simply "umtrx".
Guessing there may be a bug in the way in which PyBOM
Hi Martin,
Thanks!
Ok, I attach three files here. I hope you get from the code what is going on
there.
ofdm_dictionary_3.cc is the middle components code. After processing inside
that I pass data into ofdm_dictionary_2.cc
Again, it works for smaller number of int delay_min, int delay_max, in
Oh! Of course. Yes, that's why I wanted to see the complete output --
timestamps are not kept in the saved samples. You'll only get timestamps if
you are viewing live data.
--n
On Wed, Jan 29, 2014 at 2:24 AM, Cheng Chi wrote:
> Hi Nick,
>
> Thanks for your explanation :)
>
> Today I have coll
Hello,
I am new to GNU Radio and I followed the new windows install directions
listed in the thread "Successful installation of GNURadio 3.6.4.1 on Window
XP and Windows 8" for my Windows 7 machine (intel 64 bit OS). Everything
installed okay except when I created a simple chain in the gnu
radio
I believe Daniel Garcia implemented this successfully a while ago.
Check http://www.danielgarcia.info/thesis/ for info.
I tested it back in 2007 and it seemed to work, but only when my USRP1/TVRX was
connected to cable TV. When hooked to an antenna, apparently the signal was
not strong enough
On Wed, Jan 29, 2014 at 4:04 AM, Nemanja Savic wrote:
> Hi all gnuradioers,
>
> I have a problem to adjust delay between two paths in my flowgraph, and
> thus I have a question. The flowgraph is attached. As can be seen, there
> are two paths from the input. I would call one signal path and the o
Hi Piotr,
I was facing the same issue, and the issue is caused by Schmidl-Cox
sometimes detecting the packet boundaries a little late. This cannot really
be helped, as channel noise may force the correlator to detect a
peak/plateau later than it should. I have found a couple of ways to
overcome th
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Hi Neil,
yes, this can't work; you can only multiply two numbers if there are
two numbers (factors). Which will never be the case, since there has
not been a multiplication before the first factor.
Message passing can't make an flowgraph that has a s
On 29.01.2014 00:56, Johannes Demel wrote:
Hi,
The patch in 86845ea15ab8d36f5c196c8ab56e5b77d43b4cf9
did not make it into the 'maint' branch. As this is a bugfix it should
be applied on this branch as well.
This specific commit is in both maint and master. Sure you didn't mean
anything else?
On 29.01.2014 12:30, Nasi wrote:
Hi all,
I've created a simple flow graph with three components. The first one
generates K * L number of values (it is a loop), it passes them to the
next one where I do some operations on them.
I want it to run just once and then stop it. Therefore In The first
c
Hi all,
I've created a simple flow graph with three components. The first one generates
K * L number of values (it is a loop), it passes them to the next one where I
do some operations on them.
I want it to run just once and then stop it. Therefore In The first component I
add : boost::this_th
Hi Nick,
Thanks for your explanation :)
Today I have collected some data using the same setup, USRP N210 with GPSDO
+ WBX. The collection is done at the rooftop with open sky.
Gain: 20
Sampling Rate: 10M
Center Frequency: 1090M
Data format: complex float (Use GNUradio Companion for collecting dat
On 29.01.2014 09:48, Jordan Johnson wrote:
Googling around and was wondering if anyone has managed to get NTSC
(Analog TV) modulation working in GNURadio. I have ATSC up and going,
but would like to do some analog stuff too as my old exciter is junk. If
not, where do I start?
Googling around gi
Hi,
> I am trying to collect signal from Thuraya-3. Here is the setup I used:
> - USRP N210 + WBX
> - LNA with 30dB gain (ZHL-1217MLN)
> - Iridium Antenna (I don't have specific antenna for Thuraya right now.
> Since Iridium and Thuraya frequency bands are quite close, I suppose it
> would work mo
Googling around and was wondering if anyone has managed to get NTSC (Analog
TV) modulation working in GNURadio. I have ATSC up and going, but would
like to do some analog stuff too as my old exciter is junk. If not, where
do I start?
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