Paulo Dutra - PU4THZ retweetledi
Landsat 8 , 2282.3 MHz , 8:42 UTC
Simultaneous RHCP / LHCP RX.
A GRC flowgraph streams over UDP to two SatDump instances.
Čeština
Paulo Dutra - PU4THZ
4.7K posts
Paulo Dutra - PU4THZ
@DutraCGI
Chief of Operations - UaiSat @ LISE // Telecom Engineer Grad. // C++ / Python / FPGA/ GnuRadio // Microwave / SDR / Ham radio 🇧🇷
Brasil Katılım Mart 2016
823 Takip Edilen1.5K Takipçiler
Paulo Dutra - PU4THZ retweetledi
Our community built a chip. Tom put it in space.
New interview with the CEO of @AlbaOrbital - the Scottish startup that's launched more satellites than most countries, with zero government funding.
youtube.com/watch?v=yVeHPT…
YouTube
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Paulo Dutra - PU4THZ retweetledi
🎬 HANBIT-Nano First Commercial Launch Highlight
Every launch mission is built upon years of preparation and relentless engineering.
INNOSPACE presents a highlight video capturing the countless tests, technical challenges, and the development journey behind the HANBIT-Nano “SPACEWARD” mission.
From the first spark of the engine to lift-off, every moment of this mission represents the dedication and effort of our engineers and teams.
For INNOSPACE, progress is defined not only by outcomes, but by the continuous pursuit of innovation.
We keep moving forward — bringing space closer for all. 🚀🌌
#SPACEWARD #SpaceInnovation #SpaceLaunch #Rocket #LaunchVehicle #OrbitalLaunch #NewSpace
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Paulo Dutra - PU4THZ retweetledi
@Ascii211 Win++ Its an amazing device! But weak tx might be something bad with the rfic tough :/ I hope not :)
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Adopted a Ettus B200 out of the trash bin today, only issue is weak TX. LFG
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Paulo Dutra - PU4THZ retweetledi
Finally, we got the deployment video of the 12 meter Reflector Antenna on NISAR.
Thanks to Ohsin on r/ISRO.
Link : m.youtube.com/watch?v=BYgXgs…
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Paulo Dutra - PU4THZ retweetledi
More context on the reflector - Left image is where it was stowed and right is the picture taken of NISAR by another satellite in orbit, showing the reflector completely deployed.
Vikranth@VikranthJonna
Finally, we got the deployment video of the 12 meter Reflector Antenna on NISAR. Thanks to Ohsin on r/ISRO. Link : m.youtube.com/watch?v=BYgXgs…
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@luigifcruz Nice, I'll test it later... I need to work on that plugin too haha
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Just updated CyberEther Web with a WebUSB patch that fixed a bug that caused the RTL-SDR not to be recognized in some devices.
Luigi Cruz@luigifcruz
You can track flights with ADS-B from your Chrome-based browser using CyberEther Web and a RTL-SDR. No drivers, just WebUSB + WebGPU + Web Assembly. cyberether.org/web
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Paulo Dutra - PU4THZ retweetledi
Paulo Dutra - PU4THZ retweetledi
Paulo Dutra - PU4THZ retweetledi
You can use the quadratic formula to make homing missiles properly lead and hit their target. I've used this in games for like a decade.
I wish they'd use examples like that in math class. Give practical/fun examples. I hated math b/c it was too abstract. Gamedev made it fun.
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@DanielBogdanoff I guess the hard part might be getting the ADAR1000 ic's themselves, they seem to be export controlled ? I found some distribuitors once tough, that price is consistent with their cost estimate... (~200-300usd/un) depends on qty, tough
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Rough BOM cost check in the US:
LTC5552 = $60 x 2 = $120
ADAR1000 phase shifters = $195 x4 = $780
ADTR1107 front end = $225 * 16 = $3600
ADTXC7A100T FPGA = ~$200
Excluding boards, maybe ~$5k in chips/parts
The "10 Watt" version needs power amps:
QPA2962TR7 = ~$450 * 16 = $7200
chiefofautism@chiefofautism
someone built an OPENSOURCE MILITARY RADAR that tracks multiple targets up to 20km away its called AERIS-10, full github repo schematics, PCB layouts, FPGA code, python GUI, everything under MIT license commercial phased array radar starts at $250,000. military surplus is $10,000-50,000 but its decades old analog junk with no electronic beam steering this does electronic beam steering at 10.5GHz, pulse compression, doppler processing, multi-target tracking on a real time map two versions: 3km range with patch antenna array, 20km range with 32x16 slotted waveguide array and GaN AMPLIFIERS custom frequency synthesizer, 16 front-end chips, FPGA doing all signal processing, GPS and IMU for ACCURATE target coordinates when the platform moves all gerber files included so you can order the PCBs and build it yourself one person built what defense contractors charge a quarter MILLION for and open sourced it
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@tty0x24 This is interesting, once I managed to get claude (+ a lot of hand work sadly) to implement a SDR based TX for CCSDS 131.2-B, sadly I lost the hard drive that the code was on... LoL... I looked into DVB-S2 but the llm's just hallucinate too much... If you have any tips :)
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1M context size update with new token metric, completes benchmark DVB-S2 tests in few hours
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@samsoniuk @artistic_radio This is really amazing! Crazy how a few lines of dsp code could turn into many IC's!
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ディスクリートDSPラジオのQ相同期式乗算器。これで8ビットの(1+mcosωst)cosωtとsinωtを掛け合わせる。ディスクリートを標榜するならやはりDIP。SOPで基板1枚に収めるよりDIPで部品の躍動感を表現したかった。これで1秒間に1638.4万回、上記の8ビットを計算する。初めて動いた時の感動は今も忘れない。
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@Kummari93Mahesh dB is a relative unit, its 1/10 of a Bel, think of it like a multiplier... when you add 0dB + 0dB you essentially get 0dB because you're doing just unit arithmetic, but 0dBm is actually a 'value' (1mW) so when you add 0dBm + 0dBm you're essentially doing 1mW+1mW = 2mW (3dB)
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Yes, it does feel strange to know this is correct...
Daniel Bogdanoff@DanielBogdanoff
Happy to report that just about everyone is mildly uncomfortable with this video.
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Paulo Dutra - PU4THZ retweetledi
Paulo Dutra - PU4THZ retweetledi
@devnulling @samsoniuk @ico_TC Added MIT license, I probably won't have much time to play with this but I'll try adding features later :)
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@samsoniuk @ico_TC @devnulling So I think I removed the time plot of this tool ? It has only the eye diagram and the constellation (xy) diagram, lol... It should be an easy fix
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@DutraCGI @ico_TC @devnulling I remember some old modems had debug output with IQ signal, so it was possible attach to the oscilloscope and plot the constellation! ☺️
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