[Discuss-gnuradio] Extra RF shielding?

I'd like to make a shield for my usrps. I have a significant direct path from the transmitting antenna to the receiving usrp case. I want to eliminate this path and receive only from the rx antenna. Are there any hacks I can use to make a makeshift rf shield for my usrps? Thanks, AB

[Discuss-gnuradio] Channel model & frequency offset

I am trying to analyze channel model effect between am transmitter and receiver but whenever i change frequency offset using slider i can't be able to see the frequency change. In both transmitter and receiver are at the same frequency . Best, ATIF JAVED

Re: [Discuss-gnuradio] Audio sink + windows binaries

It seems the problem resides in the relationship between the wav file source and the windows audio sink. The win audio sink is playing "live" audio fine The wav file sink can record that same audio to a file That file plays back fine in VLC. These steps appear to validate that audio sink is

[Discuss-gnuradio] Getting consistent noutput_items

I am having a problem adapting a UDP sink block for sending raw protocol frames. I am using a 32KB binary file source connected to my Sink connecting to my Source on another PC, finally outputting to a file sink.  My expectation/goal is that my output file is identical to the input file so

Re: [Discuss-gnuradio] gr-dtv | DVB-S2X Compatibility test

Thanx for testing with the RX8200. I believe the two failures are not valid modcod's. DVB-S2X 8PSK 26/45 only exists for short frames (which it seems the RX8200 does not support). In the Python script, there should be even more checking with regards to short/normal frames. DVB-S2X 16APSK

Re: [Discuss-gnuradio] Audio sink + windows binaries

Great Geof, thanks for the feedback! The wav file was downloaded from the internet and the data file was generated by the simple matlab script that is also present in the Dropbox directory I provided: essentially it opens the wav file, reads the samples, extracts only one of the two channels and

Re: [Discuss-gnuradio] Audio sink + windows binaries

Achilleas, I have duplicated the problem with the same setup, playing the .data file w/ the file source, and also playing the wav file with the wav file source produces similar distorted results. However, I don't have a quick solution to return. I'll need to keep looking. Can you describe how

Re: [Discuss-gnuradio] Audio sink + windows binaries

Hi Marcus, thanks for offering to help. As i say in my email the audio file sounds with a different speed than the original! I have added a new file in the Dropbox link that I sent last time, "experiment.m4a" If you play it you'll hear the two different sounds: one from my standard wav player

[Discuss-gnuradio] gr-dtv | DVB-S2X Compatibility test

Hey Ron, I tested the "standard-compliance" of the dvb-s2 blocks (DVB-S2X modcods) of gnuradio by the help of an RX8200 up to 32APSK. Here are the results. :-) Symbol rate: 5M Roll-off: 0.2 No sync possible for: DVB-S2X 8PSK 26/45 DVB-S2X 16APSK 7/9 Sync / TS lock: DVB-S2X QPSK 9/20 DVB-S2X

Re: [Discuss-gnuradio] Frequency hopping

On 10/22/2017 10:17 PM, Atif Javed wrote: > Can gnu radio is used for frequency hopping transmission? If yes then > please guide me how it is possible See Marcus' and mine answers to the other thread on this. -- M ___ Discuss-gnuradio mailing list

Re: [Discuss-gnuradio] Frequency hopping in gnu radio

There's even an example in gr-uhd/examples/python/freq_hopping.py Cheers, M On 10/25/2017 12:51 AM, Usman Haider wrote: > Hi Atif, > > > You can use combination of timed commands, and set_center_freq to do > hopping. See following links > > >

Re: [Discuss-gnuradio] gr-dtv | DVB-S2 : video bitrate const while symbol rate increased

It should be noted that the original DVB-S2 code was written by Charles Brain G4GUO for his DATV-Express project. My role was to port it to GNU Radio and add the DVB-S2X extensions. So definitely standing on the shoulders of giants. https://github.com/G4GUO/datvexpress_gui Not all the

Re: [Discuss-gnuradio] How can I get colliding packets?

Dear Marcus, thank you for your response. My objective is to implement zigzag decoding in TWRC. In order to do that, I need to capture some colliding packets and then use some free-interference parts for zigzag decoding. In benchmark_tx and benchmark_rx example, I could see the number of received

Re: [Discuss-gnuradio] gr-dtv | DVB-S2 : video bitrate const while symbol rate increased

Dear Marcus and Ron, thanks for your support! The longer video file revealed some "forward jumps" in the video which I did not recognize using the short example video with it's many "jumps" and "cuts". Either the Rx8200 or VLC is buffering only a portition before jumping to the most

Re: [Discuss-gnuradio] How can I get colliding packets?

Dear Kirianto, could you explain what you mean with "get"? And: How can, in a unidirectional single-transmitter benchmark, there be *any* colliding packets? Best regards, Marcus On 2017-10-25 10:26, Kurniawan Dwi Irianto wrote: Dear All, does someone know how to get colliding packets? I

Re: [Discuss-gnuradio] Warning while running gr-ieee-80211

Well indeed. I accidentally plugged USB 2.0 cable instead of 3. Thanks. I realized that "A USB 3.0 cable is required for USB 3.0 speeds" On Wed, Oct 25, 2017 at 9:08 AM, Bastian Bloessl wrote: > Hi, > > On 10/25/2017 06:13 AM, sumit kumar wrote: > >> *Ubuntu 16.04* >>

Re: [Discuss-gnuradio] gr-dtv | DVB-S2 : video bitrate const while symbol rate increased

If you're sending the stream too fast by increasing the symbol rate, then some buffer on the receive side will overflow eventually. Here's an 11 minute stream to test with. It's muxed at the same rate as adv16apsk910.ts. http://www.w6rz.net/thecooler16apsk.ts Most likely the RX8200 is

[Discuss-gnuradio] How can I get colliding packets?

Dear All, does someone know how to get colliding packets? I know there is an example in gnuradio under gr-digital which is benchmark_rx.py that can capture the number of received packets. But I cannot see how to get the colliding packets. Does anyone has any idea how to get it? Many thanks in

Re: [Discuss-gnuradio] Audio sink + windows binaries

Hi Achilleas, could you be more specific what "not playing what is SUPPOSED to play"? Don't have windows at hand, but maybe we can work on a solution together based on a problem description. Cheers, Marcus On 2017-10-25 03:26, Achilleas Anastasopoulos wrote: Hi all, I have a problem

Re: [Discuss-gnuradio] Reset gnu radio simulation

Not at all. You simply stop the flow graph and build it anew. On 2017-10-25 05:19, Atif Javed wrote: How can we able to reset the gnu radio simulation during run time using blocks. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org

Re: [Discuss-gnuradio] gr-dtv | DVB-S2 : video bitrate const while symbol rate increased

Hi Kai, On 2017-10-24 23:40, Kai-Uwe Storek wrote: Hey folks, this is just a request for enlightenment. :-) granted. (Just kidding, who am I to decide who is enlightened and who's not? It's Wednesday, so it's Ron's turn to grant RfEs; CC:'ed.) I was playing around with the dvb-s2 modulation

Re: [Discuss-gnuradio] Frequency hopping in gnu radio

Hi Atif, You can use combination of timed commands, and set_center_freq to do hopping. See following links https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a191b78b00d051d3d51c2f719361c1fb5

Re: [Discuss-gnuradio] Plot I vs Q vs Time

Hi Chris, not in-tree, no, but have a look at the pretty visualization Gerald Baier's gr_channelsounder produces, maybe it's what you're after. Other than that, there's pyqtgraph, with which you can generate dynamic 3D plots with relative ease; Tim O'Shea has gr-pyqt , which uses that, but

Re: [Discuss-gnuradio] Warning while running gr-ieee-80211

Hi, On 10/25/2017 06:13 AM, sumit kumar wrote: *Ubuntu 16.04* *GNURadio and gr-ieee-80211 installed yesterday using pybombs * I get this warning when I run the wifi_rx.grc "The total sum of rates (20.00 MSps on 1 channels) exceeds the maximum capacity of the connection" Looks like