Help with cubesats
Hi, I’m looking for assistance with setting up a raspberry pi, with Direwolf and gr-satellites, to receive and decode from the Phoenix cubesats being deployed on February 17. Specifically, they will be ax.25, using GMSK. Is it possible to use a raspberry pi to record the audio, and record the waterfall? I was hoping to make this a stand-alone unit that I can upload the information when available. It is a raspberry pi 3 b, with an RTL-SDR dongle. I don’t have a screen on it. I am still very new, I have set up a couple raspberry pi’s with Direwolf, and have set up a Windows 7 netbook for RX WSPR. I would really appreciate any help. Thank you, -Andy, N2YQO
Re: Help with cubesats
Hi Andy, You'll probably want to use gr-satellites instead of direwolf. https://github.com/daniestevez/gr-satellites You can record a pass using GNU Radio using a File Sink. Regards, Nate Temple On Sat, Feb 15, 2020 at 6:01 PM Andrew Stamp wrote: > Hi, > > I’m looking for assistance with setting up a raspberry pi, with Direwolf > and gr-satellites, to receive and decode from the Phoenix cubesats being > deployed on February 17. Specifically, they will be ax.25, using GMSK. Is > it possible to use a raspberry pi to record the audio, and record the > waterfall? I was hoping to make this a stand-alone unit that I can upload > the information when available. It is a raspberry pi 3 b, with an RTL-SDR > dongle. I don’t have a screen on it. I am still very new, I have set up a > couple raspberry pi’s with Direwolf, and have set up a Windows 7 netbook > for RX WSPR. I would really appreciate any help. > > Thank you, > > -Andy, N2YQO >
Re: Help with cubesats
Hi Andrew, I would encourage you to try using GNU Radio first on your host machine in order to become familiar with it's operation. Then once you have an understanding of it, you can easily deploy your application/flowgraph to a headless device like a raspberry pi. I'd suggest starting by going through the tutorials on the wiki https://wiki.gnuradio.org/index.php/Main_Page >From there, you can take an existing flowgraph and drop in a file sink to test it out. https://wiki.gnuradio.org/index.php/File_Sink Once you want to deploy it as a headless application, you can add in Parameter blocks to dynamically change the filename of the file sink, and switch your flowgraph from QT to "No GUI", and it can be ran from the command line. Regards, Nate Temple On Sun, Feb 16, 2020 at 12:02 PM Andrew Stamp wrote: > Hi Nate, > > Thank you for your reply. I was hoping to use this standalone, no screen. > Is that possible? > > Can you explain a file sink for me please? It will do 9600 ax.25 GMSK? > Sorry, still very new > > Thank you, > > Andy > > On Sat, Feb 15, 2020 at 11:24 PM Nate Temple > wrote: > >> Hi Andy, >> >> You'll probably want to use gr-satellites instead of direwolf. >> https://github.com/daniestevez/gr-satellites >> >> You can record a pass using GNU Radio using a File Sink. >> >> Regards, >> Nate Temple >> >> On Sat, Feb 15, 2020 at 6:01 PM Andrew Stamp wrote: >> >>> Hi, >>> >>> I’m looking for assistance with setting up a raspberry pi, with Direwolf >>> and gr-satellites, to receive and decode from the Phoenix cubesats being >>> deployed on February 17. Specifically, they will be ax.25, using GMSK. Is >>> it possible to use a raspberry pi to record the audio, and record the >>> waterfall? I was hoping to make this a stand-alone unit that I can upload >>> the information when available. It is a raspberry pi 3 b, with an RTL-SDR >>> dongle. I don’t have a screen on it. I am still very new, I have set up a >>> couple raspberry pi’s with Direwolf, and have set up a Windows 7 netbook >>> for RX WSPR. I would really appreciate any help. >>> >>> Thank you, >>> >>> -Andy, N2YQO >>> >>
Re: Help with cubesats
Hi Andrew, Shameless plug, but you can take a look at this repo https://gitlab.com/phorvath/smogcli2 to record samples with RTL-SDR and Raspberry PI. It is developed for the ATL-1 and SMOG-P satellites. It is a standalone application, samples at 1.6 or 2.0 maps, tracks the location of the satellite and starts recording if the elevation is above -2 degrees. When it is recording it compensates for Doppler and then downsamples to 50 ksps (or 62.2 ksps). You can process your recordings with gr-satellites or a GNURadio flow graph.. Miklos On Sun, Feb 16, 2020 at 3:00 AM Andrew Stamp wrote: > > Hi, > > I’m looking for assistance with setting up a raspberry pi, with Direwolf and > gr-satellites, to receive and decode from the Phoenix cubesats being deployed > on February 17. Specifically, they will be ax.25, using GMSK. Is it possible > to use a raspberry pi to record the audio, and record the waterfall? I was > hoping to make this a stand-alone unit that I can upload the information when > available. It is a raspberry pi 3 b, with an RTL-SDR dongle. I don’t have a > screen on it. I am still very new, I have set up a couple raspberry pi’s with > Direwolf, and have set up a Windows 7 netbook for RX WSPR. I would really > appreciate any help. > > Thank you, > > -Andy, N2YQO
