Re: [Discuss-gnuradio] GNU Radio Meetup this Tuesday in Reston, VA

Anyone meeting in the lobby to get the shuttle? Time? On Tue, Mar 15, 2016 at 3:33 PM, Tom Rondeau <trond...@trondeau.com> wrote: > Generally shuttle or carpooling. > > Tom > > Sent from my phone > > On Mar 15, 2016, at 6:21 PM, Stephen Harrison <msteveharri.

Re: [Discuss-gnuradio] GNU Radio Meetup this Tuesday in Reston, VA

How are people getting down there? Shuttle? On Sun, Mar 13, 2016 at 4:57 PM, Tom Rondeau wrote: > Once again, for anyone in area, we will be having a GNU Radio Meetup at > the American Tap Room in Reston Town center this Tuesday starting at 7:30. > While we're in town for

Re: [Discuss-gnuradio] Reading ZMQ messages in Python

try struct.unpack() On Tue, Sep 8, 2015 at 11:17 AM, Daniel Mazzer wrote: > Hello, > > I have a flowgraph that send ZMQ PUB messages generated by a custom > OOT block. The messages transmitted by GNURadio ZMQ PUB block are > received by a Python application, using a standard

Re: [Discuss-gnuradio] isolate channels from wideband

A simple way in GNURadio is to use the frequency xlating fir filter to select individual channels. On Tue, Jul 21, 2015 at 8:39 AM, Markus Heller hel...@relix.de wrote: Dear list, I'd like to understand how to receive the 2m band as one wideband input (144-146 MHz) and afterwards split the

Re: [Discuss-gnuradio] Tagged stream align duplicates tags

I've noticed this issue as well, I think tagged_stream_align does an add_item_tag but the original tag also passes through. I'm trying to do a similar thing to what Laur describes. On Wed, Jul 15, 2015 at 11:48 AM, Martin Braun martin.br...@ettus.com wrote: On 15.07.2015 05:39, Laur Joost

Re: [Discuss-gnuradio] Two Clock Drift Compensation, howto ?

Hi Roland, I have used the method you suggest in the distant past to match sample rates of audio hardware with nominally equal but independent clocks. I found it worked ok as long as the resampler you are using can handle small dynamic offsets ie: +/- 0.1Hz without noticeable artifacts. The FIFO

Re: [Discuss-gnuradio] GNU Radio support on MicroZed

Hi Sean, Is the Linaro distribution possible on MicroZed? I spent a long time trying to get OpenEmbedded to happen with no success. The Linaro distribution was a snap and I got GNURadio running no problem on the ZedBoard. Stephen On Sat, Aug 23, 2014 at 6:55 PM, West, Nathan

Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210

I did this exact experiment about a year ago. It's caused by the resolution of the phase accumulator in the DDC. On Tue, Jun 17, 2014 at 2:09 PM, Marcus D. Leech mle...@ripnet.com wrote: On 06/17/2014 04:56 PM, Daniele Nicolodi wrote: I'll try to see if this makes a difference. The minimum

Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210

Just some quick calculations in python: exact phase increment for 10 MHz: (10e6/100e6)*2**32 429496729.6 Closest phase increment: np.round((10e6/100e6)*2**32) 429496730.0 Resulting frequency: (np.round(10e6/100e6*2**32)/2**32)*100e6 1000.009313226 We are out by 9.3mHz! On Tue, Jun

Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210

only, which would not result in a frequency systematic error. Cheers, Daniele On 18/06/2014 00:43, Stephen Harrison wrote: Just some quick calculations in python: exact phase increment for 10 MHz: (10e6/100e6)*2**32 429496729.6 Closest phase increment: np.round((10e6/100e6)*2

Re: [Discuss-gnuradio] Phase measurement with Ettus Research N210

errors in both amplitude and phase but you are right, this is not the cause of the frequency offset you observe. On Tue, Jun 17, 2014 at 4:09 PM, Stephen Harrison msteveharri...@gmail.com wrote: The Verilog source for the USRP N210 is available online. You can see this in ddc_chain.v: wire [31:0

Re: [Discuss-gnuradio] Measuring phase between channels

I did an experiment similar to this a year or so ago. I synced all the USRPs to the same 10MHz and PPS. I had pretty good results using libgps to get the GPS time and then using UHD to start streaming on a particular PPS edge on all units. With LFRX boards this will ensure that the DDCs start at

[Discuss-gnuradio] Segfaults when executing flowgraph.

Hi, I seem to be having a problem where GRC works fine but when I execute the generated Python code (from within GRC or from command line) it just segfaults. So far it's every flowgraph I've tried. The flowgraph I am working with is just a sine source, throttle and WX scope. Where can I start

Re: [Discuss-gnuradio] Xlate FIR filter broken in gr 3.7

Is it just me or did the polarity of the frequency offset in freq_xlating_fir_filter get reversed between 3.6 and 3.7? On Thu, Aug 8, 2013 at 6:04 AM, Anton Komarov akoma...@nvisiongroup.ruwrote: Who can help me to open a ticket? On Wed, Aug 7, 2013 at 4:53 PM, Anton Komarov

Re: [Discuss-gnuradio] Xlate FIR filter broken in gr 3.7

I agree.. the new way is more intuitive but then again it broke a bunch of my GRC patches.. :) On Thu, Aug 8, 2013 at 1:36 PM, Sylvain Munaut 246...@gmail.com wrote: Hi, The old style version of the block in gnuradio-core in 3.6.5.1 works correctly. The new style version of the block in

Re: [Discuss-gnuradio] GNU Radio Companion v3.7.0-1-g2c05acc1 python name-spaces not working

I had the same problem, but realized I was using the GRC .xml definitions from the previous version (in /usr/local/share/gnuradio/blocks). On Thu, Jul 4, 2013 at 2:12 PM, Tom Rondeau t...@trondeau.com wrote: On Thu, Jul 4, 2013 at 4:58 PM, Andrew Davis glneolistm...@gmail.com wrote: Hello

[Discuss-gnuradio] Default value of Taps in GRC

The XML for filter_rational_resampler_xxx sets the default value of Taps to None. However, this gives the error Expression [None] is invalid for type complex vector. Deleting None from this box fixes the problem. Is it safe to change my XML definition to have no default value?

[Discuss-gnuradio] Operation of short to char

Hi, Just wondering if the operation of short to char is a bug or intentional. The most significant 8 bits of the short gets converted to char, ie: 0-255 (short) - 0 (char) 256-511 (short) - 1 (char) 512-767 (short) - 2 (char) This is not the operation I expected, but the unit test allows it to

[Discuss-gnuradio] How to use constellation decoder

Hi, I am struggling to use the constellation decoder. I saw this post, but it does not work for me. http://gnuradio.4.n7.nabble.com/Constellation-Decoder-GRC-Help-td36508.html#a34137043 from gnuradio import digital digital.constellation_decoder_cb(digital.constellation_bpsk()) Traceback (most