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414 results for “abraxas3d”
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Cyclic prefix for the #OFDM symbols is working on #Neptune. Took longer than it should because the data visualization had some quirks.
Moving towards more of this #drone based protocol being in an #fpga
Really nice to work with such a professional and competent team of #opensource volunteers.
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There has been a lot of #OFDM work for #neptune, and #polyphase work for #Haifuraiya over the past week. We're looking forward to another great week ahead.
Haifuraiya, by the way, is an #opensource #heo or #geo communications payload for #hamradio.
There is a lot of great work going on, but if you have not been hearing about it and want to, then please add yourself to our newsletter audience here: https://www.openresearch.institute/newsletter-subscription/
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Started the process of adjusting the design constraints to get the #ADRV9002 working with the #zcu106 in @OpenResearchIns #FPGA Remote Labs. Got the simple stuff done first - GPIO switches and LEDs.
This rig will be used for #Neptune, an #OpenSource #ofdm low-layency project for #Drones and #aerospace
Draft specification has been circulated for initial review.
Leonard Dieguez, an FPGA designer with military rotary wing background, is the project lead.
More updates soon :)
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If you've gotten the zcu106 to work with an ADRV9002 the same way it does with a zcu102, let me know!
Trying to get this on the air in @OpenResearchIns Remote Labs for an #opensource #OFDM #transceiver project.
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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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Very excited about this month's #HackerBox
Their full writeup will be out tomorrow, but here's what is inside.
#Theremin and #ultrasonic !
First, what is HackerBox? It's a subscription electronics experiment kit. It come unassembled, so there is #soldering.
#OpenSource is emphasized and enabled. The boxes cover a huge variety of electronics applications.
I use them as project kits but also to bulk up my "stash" of electronics parts.
Currently costs $44/month
https://hackerboxes.com/products/hackerbox-monthly-subscription
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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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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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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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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.
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Great presentation by Mikio-san JA3GEP about #QO-100 at the #JAMSAT monthly meetup today. Berni DJ5MN spoke in appreciation for the highly successful activation of Christmas Island.
Talk about edge of coverage - very interesting expedition! More details and photos will undoubtedly be in an upcoming Jamsat Journal.
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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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After the COBS protocol is implemented on the #amateur #satellite downlink, then we move to to uplink receiver.
Here's how FSK can be received with HDL (Verilog). Diagram in the image below.
There's more advanced ways to do it, but this is where we're starting over at ORI. The multi-channel uplink will be done with multirate techniques. This is for #opensource #HEO payload work.
If you want to learn more or keep up, then please visit https://openresearch.institute/getting-started. Everyone welcome, CoC enforced.
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Final stretch of an important component for a COBS protocol decoder. This goes into #Haifuraiya which is an #opensource #HEO or #GEO #amateur #satellite on the #microwave bands.
This writeup shows how the #VHDL was designed for the #FPGA used.
There's a bug with tlast right now, but it's a problem only when frame delimiters are stretched more than a byte. This isn't something that "should" happen, but it "could", so the decoder is designed to tolerate it.
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#opensource #fpga work for #amateur #satellite. Better testbench revealed mistakes in the combinatorial part of the #HEO transponder design. Will get fixed today. This is a COBS protocol decoder, to make the downlink baseband frames much more resilient.
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The current #JAMSAT Journal has Open Research Institute's #opensource #amateur #HEO #satellite proposal, called #Haifuraiya. Plenty of details, runs pages 17-29.
In Japanese, kindly translated from English by Mikio Mouri JA3GEP.
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For complex RFICs, the behavior is set by profiles or configuration files. For an #opensource #amateur #HEO #satellite we are working on at #ORI, the profile sets the symbol rate as low as the chip can go: 10 MHz.
Here in the image we are at an intermediate step of modifying rates. On a spectrum analyzer is data from a DMA read coming from a Zynq, transferred to an AD9371, and TX at 2 GHz in the lab.
Volunteer on this or a growing number of other projects at http://openresearch.institute/getting-started
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For complex RFICs, the behavior is set by profiles or configuration files. For the #opensource #amateur #HEO #satellite we are working on at #ORI, the profile sets the symbol rate as low as the chip can go: 10 MHz.
Here in the image we are at an intermediate step of modifying rates. On a spectrum analyzer is data from a DMA read coming from a Zynq, transferred to an AD9371, and TX at 2 GHz in the lab.
Volunteer on this or a growing number of other projects at http://openresearch.institute/getting-started
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I wasn't fully aware of how much #difficulty this team had. They #prevailed despite many setbacks and apathy, and thank goodness for that.
It's #inspiring, yet also very sobering, to weigh and consider their story. The key thing for me was when they met someone who told them they had fought for them as a reviewer to get their work published.
Do not be afraid to speak up in defense of good work, no matter who it angers or annoys.
https://www.science.org/content/blog-post/nobel-modified-mrna
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@infil00p I didn't have a word for it for years, but I'm a very good pair programmer. I can make almost anyone more than twice as productive as they were alone, if they can work with another human.
This was recognized and properly rewarded only once in my career (at Qualcomm).
That is all it took for me to see that #whiteboarding completely filters people like me out.
Now I do pair programming as part of work at my own company, and try to keep an eye out for others like me.
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Big step forward with the #opensource Theseus Cores #polyphase filter bank successfully stitched in to the HDL Reference Design from Analog Devices. This is a big part of the receiver on the space segment of our #microwave band GEO/HEO #amateur #satellite design.
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Found a potential issue with the Theseus Cores #polyphase channelizer. The volunteer already has a fix in mind, and it's not a deal-breaker for lab demonstrations.
#Haifuraiya progress! This is an #opensource #satellite #communications design and will be prototyped on the #hamradio #microwave bands.
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Singling out which phase of the moon we're talking about has always reminded me of #polyphase processing.
Wouldn't be fun to include this as... wait for it... an Easter egg in a multirate design?
Or, a #CTF?
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Singling out which phase of the moon we're talking about has always reminded me of #polyphase processing.
Wouldn't be fun to include this as... wait for it... an Easter egg in a multirate design?
Or, a #CTF?
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Notes for a talk on #Haifuraiya covering the #polyphase techniques used in the #microwave #receiver design.
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Dr. Daniel Marks speaks about #RFBitBanger and #SCAMP mode in this video from #QSOToday Ham Expo.
https://youtube.com/watch?v=Fbgs_4QsKnE
Get this kit for a small donation at https://us.commitchange.com/ca/san-diego/open-research-institute/campaigns/rfbitbanger-solstice-special
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@KI5SMN @k2za @OpenResearchIns
Dr. Marks writes:
I've looked plenty at the uSDX source code and it is quite possible to add something like #SCAMP to the #uSDX. The SCAMP demodulator would have filters for both in phase and quadrature phase and then select the sideband by adding or subtracting the two filters. It might be easier to port the #RFBitBanger source code to the uSDX hardware than adapt the uSDX source code to SCAMP...
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#SCAMP calling frequencies for the #RFBitBanger are being discussed over on @OpenResearchIns Slack. Great feedback so far.
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The #defcon Show Special for #RFBitBanger, an #opensource #HF #QRP kit featuring the #scamp #digital mode and a class E amplifier design, has Sold Out.
Next stop is #qsotoday Academy on 9-10 September with a talk by team lead Dr. Daniel Marks. Event registration here https://www.qsotodayhamexpo.com/
Thank you to everyone supporting work like this at the non-profit ORI @OpenResearchIns