Karl Matthias 🇺🇦
@relistan@mstdn.social
mastodon
4.5.9
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media.
American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
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Joined April 27, 2022
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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3d ago
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Mar 06, 2026
I built an iOS app for myself: a set of RF calculators (inductance and reactance, toroids, air core inductors, parallel/series resistors and capacitors, pi networks, etc). Using Ionic framework and Codex, it took only a few hours to have something decent enough that I'll use it for myself. I previously had a web page I had collected calculators on, but this is on the phone all the time. We'll see how it goes, but pretty happy with it so far. #HamRadio #AmateurRadio
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
·
Mar 01, 2026
For my homebrew 20m SSB rig... Following up on the success of the audio pre-amp, I built up the product detector from the BITX20, including the 4dB pad. Here's me testing that with the BFO from the BITX20 modified down to 9Mhz. The VFO here is an SI5351-based bench oscillator running my own software, that I made back in the fall. The audio amp is my own design. #HamRadio #AmateurRadio
https://youtu.be/Xko_p5t7XzU?si=Kyun8OxhLAt1iVQw
https://youtu.be/Xko_p5t7XzU?si=Kyun8OxhLAt1iVQw
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
·
Mar 01, 2026
Another very good day working on my homebrew 20m SSB rig. I designed and built a simple BC549-based 46dB audio pre-amplifier to boost an electret mic. Here's me testing it out with a Motorola hand mic I chopped up for another project awhile ago and will now use for this radio. The output amplifier is the Soviet PNP transistor based one I designed and built awhile back. #HamRadio #AmateurRadio
https://youtu.be/LQBby_bXigE?si=gbO32mZ-ydn_3Dp3
https://youtu.be/LQBby_bXigE?si=gbO32mZ-ydn_3Dp3
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 28, 2026
LOL Boots is charging €2.50 for Click and Collect . LMFAO NO.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 27, 2026
I'm continually annoyed that GopherCon UK is in August, which is pretty much the main vacation month in Europe and a terrible time to have a conference. I used to go to dotGo in Paris before that closed down, and the timing in Oct/Nov was MUCH better. #Golang #gopherconuk
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 27, 2026
Fantastic interview in French magazine "Le Point" with Reza Pahlavi, the son of the Shah of Iran. I found his response to the question highlighted here quite interesting, regarding the Carter administration's complete misunderstanding of political Islam, and the idea that they could form an Islamic "Green belt" to hold back Communisim. I intend to read more about this.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 25, 2026
When your government is entirely captured by campaign funds from an industry. https://www.reuters.com/sustainability/boards-policy-regulation/us-orders-diplomats-fight-data-sovereignty-initiatives-2026-02-25/
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 22, 2026
Making progress on my 20m SSB homebrew rig! Three working, tested bidirectional amplifiers (Hayward/Kopski) and the BFO from the BITX20 modified to 9MHz. Two amplifiers are 20dB and the other is 15dB gain. Also have a mixer (Ethernet transformer based) and a 3 pole band pass filter. More parts to come… #HamRadio #AmateurRadio
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 11, 2026
Roland Tritsch wrote this excellent post on the gulf between individual engineer performance with AI and organization performance, and what that may mean for making orgs effective. Worth a read: https://tedn.life/2026/02/07/the-augmented-software-organisation-moving-on/
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 11, 2026
Over the last couple of days, while working on other things, I worked with Claude Code to write a Mermaid diagram editor with live edit in the browser, vim bindings, and live chart updates. It has an MCP server and a CLI tool that can also talk to the API, so I can use it in writing plans with Claude. Claude can live update the drawing and pull in edits that I made, or make changes based on stuff I tell it. VERY nice iteration on my workflow.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Feb 01, 2026
Today’s success: one direction of a Hayward/Kopski bi-directional termination insensitive amplifier. I used KSP10 VHF transistors and it’s delivering more gain than expected (30dB!) rather than 20dB from 2n3904. Careful construction, so no oscillation. I’ll just put it into a pad rather than re-biasing. But it worked first try, again. Lucky weekend ☘️ I’m calling this mixed Manhattan/Ugly style “ugly man” haha
#HamRadio #AmateurRadio
#HamRadio #AmateurRadio
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
·
Jan 31, 2026
I soldered up the BFO from the BITX20 that I modified down to 9MHz and to use parts I have on hand. One of those rare moments when you draw it up, solder it together, turn it on… and it just works! 🎉
#HamRadio #AmateurRadio
#HamRadio #AmateurRadio
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Dec 13, 2025
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Dec 13, 2025
@fallen_angela @JamesBaker @lkanies still not equivalent because of actual harm to global society, regardless of motive.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
·
Dec 13, 2025
@NudelnAlDente @JamesBaker @lkanies my point is that the previous are clearly all frivolous and the last has actual impact, whether that’s the reason people care or not.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
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Dec 13, 2025
@douginamug @JamesBaker @lkanies the post was about “moral panics” drawing equivalency between social media addiction and dungeons and dragons etc.
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Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
Karl Matthias 🇺🇦
@relistan@mstdn.social
Infrastructure, architecture, #Golang, #Ruby, #ElixirLang. Co-author of "Docker: Up and Running" http://goo.gl/u3T6Lr from O’Reilly Media. American, naturalized Irish, Oregonian, cyclist, analog photographer, electronics hobbyist, and ham radio operator (EI9ITB / KB8SWH). Dublin, Ireland 🇮🇪
mstdn.social
@relistan@mstdn.social
·
Dec 13, 2025
@JamesBaker @lkanies until you get to social media, none of those were destroying democracy, the idea of real truth, or eradicating real journalism, so… yeah, false equivalency there.
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