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139 results for “abraxas3d”
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Look at this cool simulation #radio art from NB0X. He's one of our designers at @OpenResearchIns
Tried to do it justice in the alt text.
We also have some very interesting patterns in the MSK transmission that I have been trying to figure out why they are there. In the main lobe of the MSK, clearly visible using #maia, are two columns of patterns. They look like faces, bugs, and other forms. I'll try and track a good example of that for a next post.
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Software modem (c++) running on a #PlutoSDR receiving an #OpulentVoice signal transmitted from the HDL version in a #LibreSDR.
Big interoperability milestone achieved tonight.
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I got asked about #RADE work. It is impressive, but it's solving an HF specific problem. The Watterson channel model, the -2 dB SNR operation, and analog style degradation is tuned for a propagation environment where we see ionospheric multipath with fade periods measured in hundreds of milliseconds. It's a narrow (and important) niche, but it doesn't generalize upward in frequency where the channel is very different and higher bandwidth signals are legal.
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I got asked about #RADE work. It is impressive, but it's solving an HF specific problem. The Watterson channel model, the -2 dB SNR operation, and analog style degradation is tuned for a propagation environment where we see ionospheric multipath with fade periods measured in hundreds of milliseconds. It's a narrow (and important) niche, but it doesn't generalize upward in frequency where the channel is very different and higher bandwidth signals are legal.
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I got asked about #RADE work. It is impressive, but it's solving an HF specific problem. The Watterson channel model, the -2 dB SNR operation, and analog style degradation is tuned for a propagation environment where we see ionospheric multipath with fade periods measured in hundreds of milliseconds. It's a narrow (and important) niche, but it doesn't generalize upward in frequency where the channel is very different and higher bandwidth signals are legal.
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I got asked about #RADE work. It is impressive, but it's solving an HF specific problem. The Watterson channel model, the -2 dB SNR operation, and analog style degradation is tuned for a propagation environment where we see ionospheric multipath with fade periods measured in hundreds of milliseconds. It's a narrow (and important) niche, but it doesn't generalize upward in frequency where the channel is very different and higher bandwidth signals are legal.
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Yesterday for #OpulentVoice: a serious chat-only interface bug was fixed, the uptime clock format was improved, and lab resources for integrating the human-radio interface to the modem were stood up. A very big day at ORI! And, that was just on one project.
The schedule is now out for AMSAT-DL space days and FutureGEO workshop. We are very much looking forward to being a big part of that fundamental shift in #amateur #satellite work. #Ribbit, #RFBitBanger, and more moved forward too.
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Anyone with experience on #non-coherent #digital #communications #demodulation - we're looking at how to better integrate phase ambiguity resolution with respect to #MSK. In other words, avoid having to have a #differential encoder/decoder by using the two pre-existing #Costas loops out of phase with each other, to provide the same functionality. If this is "old news" please let us know?
Thank you @OpenResearchIns for the opportunity and support.
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Something fun - #hackerboxes this month has a different form factor. Just-received box on the bottom and the usual size box on the top.
What could possibly be inside?
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Do you know about #LTE transmitters and can help with some questions? I have what I hope is a simple question about space frequency block coding #SFBC implementation.
SFBC is a special case of space time block coding (#STBC) in #mimo, where we get a stream of transmitter samples that are supposed to go out the door and on the air, and we use some tricks to get better reliability in #multipath environments.
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CW: PWA debate
why PWAs? Because simple, clean, and completed apps are difficult to get and then keep in the app stores.
This is due to demands for "updates for updates sake" to "prove you are an active developer".
There's not enough value in this for simple, clean, completed apps and utilities. PWA are a very good alternative for utility, scheduling, and tech demo apps (like #rattlegram and #ribbit)
A lot of PWA will be junk. So are many app store products.
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You may have heard of "Florida Man".
But may I present a solid example from my home state of Arkansas?
We are made a bit differently.
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All tiles in place! Had to use the seam ripper a couple of times. Don't get your pattern accidentally turned upside down :)
Time for #Tessellation with #Hackerboxes #sewing project. This is a prototype for a larger #quilt and shows circle of fifths concepts.
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A more prosaic part of the pattern: attaching the #hackerboxes LED panels with buttonhole stitching. First one went down without incident. Soldering will be done with a shield protecting the fabric.
Time for #Tessellation!
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The magic of seeing the people I support at @OpenResearchIns get great things done never gets old!
Thank you to all our volunteers for another great week. Getting up on a Monday and being able to dive right in and help #opensource digital radio work is a privilege that I do not take for granted.
Most of what we do is on the #hamradio bands and is of direct benefit. The proof is what's on the air, from #ribbit, #RFBitBanger, #neptune, to #Haifuraiya
Next demo? #defcon32 at #RFVillage.
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Time for #Tessellation prototype gets black and white checkered #quilt binding. Not a bad effect - reminds me of NASA rockets.
We are going with the #arduino IDE because it looks like all the needed libraries are there, and the circle of fifths demo running on the #hackerboxes parts will fit.
All code will be #opensource.
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Time for Tessellation #quilt prototype tile layout below. This is an exploded #tessellation, and so far, it's my favorite, because it shows more of the quilt top. #hackerboxes control tile goes in the center.
I am going to do the anchor points for the control tile now. I'm using a historical sail eyelet model and built-in stitches on the #sewing machine to achieve the reinforced holes. Need a good thread to suspend the control tile and provide strain relief for the flexible wire that will route through these holes. Something neutral is what I am looking for.
The control tile will be able to move, therefore utilizing the #accelerometer to change the pattern of the circle of fifths #music #theory theme.
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Quilting the #prototype with #embroidery attachment is complete. Two goofs happened but got them fixed. One broken needle because the embroidery foot got hung up on the edge and dragged it under and sewed itself into a nice little cocoon. I backed that out and repaired it. Then, I finished the parts that the pattern didn't reach with a sewing foot.
Good quilt pattern? Time to weigh and consider. I'll be sending out the bigger quilt to someone with a longarm machine. I can do small stuff but a pro will really help here with the larger #quilt. This is commonly done in quilting.
Next: attach the #electronics and start #coding the #esp32 in the #hackerboxes #tessellate boards.
Time for Tessellation!
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Four groups of three black tiles are placed on the smaller prototype 35 cm #quilt square in #tesselated groupings.
Thanks to Frank Brickle for helping develop the theory here. We are tessellating the twelve note octave with #trichordal #generators of the aggregate. This concept will be reinforced with the LEDs and MIDI sound, triggered by the accelerometer in the white tile.
"Time for Tessellation" is powered by #HackerBoxes and explores GF 2^12 music theory concepts.
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Testbench passing for #polyphase channelizer for #Haifuraiya, an #opensource #HEO or #GEO communications #satellite design. Applicable to #hamradio, 5 GHz uplink and 10 GHz downlink. Shown is the transponder receiver filter.
If you’d like to join this or any other @OpenResearchIns project, get in touch.
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I have one 35 by 35 cm square left over. I am going to use it to prototype the support structure (quilting layers) and the attachment of the #hackerboxes tiles.
For a stationary object like what I’m anticipating doing here (a wall quilt) the accelerometers on the controller tiles are largely wasted. However, ambient light sensing might be useful, as well as proximity detection. Making and sensing sound is, ironically, not something I’ve thought a lot about for this music-theory-oriented design.
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Laid out the material sets for Time for Tessellation. We have 56 tiles, and 32 7-by-7 inch fabric blocks,
#quilting with #hackerboxes
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"Time to Tessellate" square production continues.
A #hackerboxes #sewing project.
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"Time to Tessellate" electronic quilting project powered by #hackerboxes.
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The Haunted Band #RATPAC #219MHz presentation is now live at
https://youtu.be/l6ds6RBufHI?si=vUbUZfI7wK3jsx30
Thank you to everyone that made this possible!
Please consider sending in your "notification" to #ARRL to show interest in activating this really neat band. Your support matters. Details in the image.
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Thank you to all that came out for The Haunted Band presentation at #RATPAC tonight! Video recording will be on YouTube soon.
We had a fun time talking about #219MHz
Please consider sending in notification of your intent to transmit on 219 MHz, if you'd like to try to help banish the ghosts and clean up the cobwebs.
Details from part 97 in the screenshot:
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I was able to step in as a replacement presenter for the Thursday evening #RATPAC session to talk about the #symbol rate rules change for US #hamradio, announced the day before.
Video recording below.
Please forgive any shortcomings. I had a couple of hours to put it together. Thank you to KB5MU, who read through the R&O and FNPRM with me to be prepared, and to all the people that came to this session that had a completely different topic than the one they expected :D
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Thank you to everyone helping with both #ribbit and #rfbitbanger, and with all the #fpga work for #neptune and #Haifuraiya
We couldn't do it without you. Some great #opensource #hamradio work going on supported by @OpenResearchIns and #ARRL, #qsotoday, #RAPAC, and more.