Re: [Discuss-gnuradio] GRC QT widget call function upon value change?

Thanks Marcus.  Worked like a charm.  I ended up using the Chooser to index two list variables.  One list of center frequencies for the Frequency Sink, and another list of strings to send out the serial port (to change hardware tuner frequencies). Lou  

[Discuss-gnuradio] GRC QT widget call function upon value change?

Is there a way to make a GRC widget, such as the QT GUI Chooser, call a function when it changes value? I have some serial port writing functions defined in a Python Module block.  I set the GUI Chooser options to write_serial(0), write_serial(1), etc..  The problem is the functions are

Re: [Discuss-gnuradio] RSSI

Run your signal into magnitude_squared -> integrate_with_decimation -> k+log(10) . That will compute mean square power. Feed in a calibrated CW tone, then offset k to match the calibrated value. Lou ___ Discuss-gnuradio mailing list

Re: [Discuss-gnuradio] Transients at burst rising edge

If you drop the baseband amplitude by 1/2, does the RX pulse peak drop by 1/2? If you have a coaxial RF diode detector, you use that before the scope. > On Aug 29, 2016, at 14:30, Lakshay Narula wrote: > > Hi Lou, > > Thanks for your response. I am generating the

Re: [Discuss-gnuradio] Transients at burst rising edge

I assume the NI equipment has no AGC, or it is disabled? > On Aug 29, 2016, at 14:30, Lakshay Narula wrote: > > Hi Lou, > > Thanks for your response. I am generating the baseband pulse just as you are. > Also, all pulses have the same transient behavior, not just the

Re: [Discuss-gnuradio] Example CMakeLists for dial_tone.cc

Thanks!  Worked great.  At least this got me reading up on how cmake goes through the sub-directories.  Starting to make some sense. Thanks, Lou On May 28, 2016, at 06:55 PM, Johnathan Corgan <jcor...@gnuradio.org> wrote: On Sat, May 28, 2016 at 3:35 PM, Louis Brown <rfeng...@me.c

[Discuss-gnuradio] Example CMakeLists for dial_tone.cc

Does anyone have an example CMakeLists.txt to build something very simple like dial_tone.cc?  I DON'T want to do this in the GR source tree, rather just have simple ~/dial_tone containing the single *.cc and CmakeLists.txt.  I have learned enough c++ now to work through the guided tutorials,

[Discuss-gnuradio] Add multiple gated streams

Anyone have an idea how I can sum (add_ff) multiple, gated streams into a single stream? For example, the gr-dsd block gates it's output when there is nothing to decode. I can sum multiple decoders together for a single audio stream, but the add_ff only processes when ALL inputs have a

Re: [Discuss-gnuradio] Inconsistant Gain in X310

Ben, I used set_auto_dc_offset(0) and that make things work correctly with the X310+LFRX. I noticed in the osmocom source the DC offset mode can be set. So what I'll do is run it in auto to get the initial correction, halt the flow, then run it in manual, and it uses the previously found

[Discuss-gnuradio] QT GUI Time Sink text scale bug

Can anyone confirm the QT GUI Time Sink has a time scale text bug when working at low sample rates in 3.7.6git-188-gf60cd24f? Please see below: https://dl.dropboxusercontent.com/u/49570443/qt_time_scale_grc.png https://dl.dropboxusercontent.com/u/49570443/qt_time_scale_plot.png

Re: [Discuss-gnuradio] GR, USRP, and GPIB measurements

1). It looks like the amplitude in UHD_SIGGEN_GUI is normalized to the peak amplitude of the combined two tones, thus it is safe to set to 1.0. Notice if you switch to a single tone, the amplitude increases when viewed on the spectrum analyzer. You must measure your output with a power

[Discuss-gnuradio] Nagoya NA-773 Whip Wide-Band Mod for SDR

I have seen a few messages asking about small, cheap antennas to use for portable SDRs, considering the RF bandwidths can span two decades. I found an SMA female, 12” telescoping whip and made a video showing how to remove the loading coil, along with the VSWR obtainable with an appropriate

Re: [Discuss-gnuradio] Questions about receiving signals of Inmarsat I-4 Satellites

Did you use gr-phosphor for that plot? On Mar 29, 2014, at 10:39 AM, Sylvain Munaut 246...@gmail.com wrote: This is what I found for inmarsat : http://i.imgur.com/KygwHdD.jpg Some 200 kHz channels and some 50 kHz channels. There is also some 30 kHz channels with a small 'X'

Re: [Discuss-gnuradio] WWVB monitoring with GNU radio

On Mar 16, 2014, at 12:00 PM, Attila Kinali att...@kinali.ch wrote: I'd be interested in the results of your analysis. Heck, i'd be even interested in the raw data :-) And yes, the insanly stupid PSK modulation scheme of WWVB is a pain for everyone. :-( I switched this reply to the thread

[Discuss-gnuradio] For Sale: bladeRF x115 with GPIO expansion

I just don't use it much since I primarily use 2m amateur band. Very clean and little use; never left my lab bench. The x115 is the large FPGA version. Also included is the GPIO expander board and the 1m USB 3.0 cable. Works great with GNU Radio via gr-osmosdr. Asking $600 via PayPal with

Re: [Discuss-gnuradio] For Sale: bladeRF x115 with GPIO expansion

: BladeRF have released an transverter that extends the frequency range down to 60KHz. Are you sure you want to sell? On Sun, Mar 16, 2014 at 12:12 PM, Louis Brown rfe...@everestkc.net wrote: I just don't use it much since I primarily use 2m amateur band. Very clean and little use; never left my

Re: [Discuss-gnuradio] For Sale: bladeRF x115 with GPIO expansion

Quite so. I have a GPSDO though, so it's nice to be able to lock to that. Last week I recorded WWVB (60 kHz) amplitude and phase for 1 week to monitor propagation. Interesting results to see the fades over 6 days Phase was futile though as their new BPSK mod messes things up. Thanks, Lou

Re: [Discuss-gnuradio] For Sale: bladeRF x115 with GPIO expansion

I built a prototype WWVB receiver in GR a couple of years ago, but I don't locally get WWVB :(Neither did my LaCrosse clock though, so it wasn't my fault :) I'll post a new thread with some WWVB data. ___ Discuss-gnuradio mailing list

[Discuss-gnuradio] WWVB monitoring with GNU radio

Here is an (almost) week long plot of WWVB signal strength taken with GR and N210 + LFRX + 500 kHz LPF + 100 foot wire. 25 Msps decimated down to 100 sps, then RMS to 1 sps. Very strong -60 dBm signal here 500 miles from the TX, yet deep fades which are consistent after sunrise. Surprisingly

Re: [Discuss-gnuradio] QT waterfall sink manual intensity

try editing the Python script directly to access the set_intensity_range(double min, double max) of the object, unless there is a way to do it in GRC. Thanks, Lou KD4HSO On Feb 25, 2014, at 10:28 AM, Tom Rondeau t...@trondeau.com wrote: On Mon, Feb 24, 2014 at 10:38 PM, Louis Brown rfe

[Discuss-gnuradio] QT waterfall sink manual intensity

Is there way to manually scale the intensity of the QT waterfall sink, in other words, set the dynamic range and reference level like the WX sink? Adjusting the time axis with the scroll wheel alters the intensity axis, but the actual color values don't change. Thanks, Lou KD4HSO

[Discuss-gnuradio] Trouble with SSB demod of real signal

Hi, I'm exploring the LF spectrum ( 500 kHz) using a USRP N210+LFRX+active loop antenna, and GR 3.7. I'm pulling my hair out trying to down convert the USB as I can't get the LSB rejected. My GRC flow graph is here: https://dl.dropboxusercontent.com/u/49570443/test.grc.png It is based on

Re: [Discuss-gnuradio] Trouble with SSB demod of real signal

From: Louis Brown rfe...@everestkc.net To: GNURadio List Discussion discuss-gnuradio@gnu.org Sent: Sunday, February 16, 2014 9:10 AM Subject: [Discuss-gnuradio] Trouble with SSB demod of real signal Hi, I'm exploring the LF spectrum ( 500 kHz) using a USRP N210+LFRX+active loop antenna

Re: [Discuss-gnuradio] Trouble with SSB demod of real signal

Tom, OK I got it fixed after looking at your link. See diagram below: https://dl.dropboxusercontent.com/u/49570443/test.grc_fixed.png I was using the Delay block to give me a 65 sample delay to account for the delay in the Hilbert. This will not work as I assume there is more delay in the

Re: [Discuss-gnuradio] Gauging interest for an SDR PA

I was thinking the user could just screw on coaxial low pass filters. For instance, the VLF- line from Minicircuits are available from 80 MHz to 6 GHz, at about $22 each. An output filter bank would be doable, but it would probably be 0.4 dB insertion loss per switch as S band, so it adds

[Discuss-gnuradio] Gauging interest for an SDR PA

Given the availability of SDR hardware (USRPs, BladeRF, HackRF, etc) covering VHF through S/C bands, is there any interest in a wide band power amp to complement this hardware? GaN seems to be ubiquitous now, and there are medium power, 48 VDC parts available in low cost SMT packages. So I

Re: [Discuss-gnuradio] PSK31 dynamic TX flow

I posted a tutorial video of generating a PSK31 data file and transmission in GNU Radio. Now it will need to be enhanced to do the dynamic flow. http://youtu.be/7IzxZKL2uUE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org

Re: [Discuss-gnuradio] gr-fosphor : New RTSA-like visualization block for GNURadio using GPU acceleration

Any ideas as to why cmake is not finding the CL libraries on my machine; Fedora 19 x64? Could NOT find OpenCL (missing: OPENCL_LIBRARIES) CMake Error at CMakeLists.txt:104 (message): OpenCL required to compile gr-fosphor I have added the following environment variables with no luck: export

Re: [Discuss-gnuradio] gr-fosphor : New RTSA-like visualization block for GNURadio using GPU acceleration

Thanks, that worked. It complied without GLFW but it errs at run time with: ImportError: libgnuradio-fosphor-3.7.0git.so.0.0.0: cannot open shared object file: No such file or directory I passed the GLFW directories to cmake, and edited line 26 of glfw_sink_c_impl.cc to remove the directory

[Discuss-gnuradio] PSK31 dynamic TX flow

I'm experimenting with PSK31 transmission. I can transmit bits streamed from a file, but to take it to the next level, I need to dynamically switch between keyboard keystroke generated data and a repetitive 1010 without stopping the flow. Is there a way in GRC (or the main GR python script)

Re: [Discuss-gnuradio] how to install blocks in gnuradio

The repository is here. I tried compiling but it is not ported to GR 3.7 yet. Hopefully it will be updated. https://github.com/balint256/gr-baz On Oct 17, 2013, at 11:01 AM, discuss-gnuradio-requ...@gnu.org wrote: Dear all, ther is some block are not available in gnuradio

Re: [Discuss-gnuradio] Signal composition and intermodulation filtering

Alessandro, You may be over-driving the DAC, which will generate very bad IMD. You have to be careful when summing signals as the total floating point value must never exceed +/- 1.0. If you are summing two signals then set your sinusoid amplitude to 0.5. Summing 4 set it to 0.25. Lou

Re: [Discuss-gnuradio] Cheap portable antenna for SSB + CW w/ USRP1?

On Oct 7, 2011, at 11:01 AM, discuss-gnuradio-requ...@gnu.org wrote: [Discuss-gnuradio] Cheap portable antenna for SSB + CW w/ USRP1? Since you are only interested in RX, a loop would probably work well. You could probably rig up compact, muti-turn wire loop that could be broken down