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Karl Matthias 🇺🇦✓ Add us as a preferred source on Google

Mastodon @relistan@mstdn.social 📍 Ireland

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Followers

549

Account age

4 yrs

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Known for

I should have simulated this first! I spent an inordinate amount of time on VU2ESE Farhan's 5W JBOT amplifier and was unable to squeeze more than about 1.6W out of it. I took matters into my own hands, replaced some transistors with hotter models, rebiased, and squeezed 2.25W out. But it's SUPPOSED to be a 5W amplifier. Simulating it in Qucs-S without modification, I get 1.5W. My version: 2.2W. Th

8 views I should have simulated this first! I spent an inordinate amount of time on VU2ESE Farhan's 5W JBOT amplifier and was unable to squeeze more than about 1.6W out of it. I took matters into my own hands, replaced some transistors with hotter models, rebiased, and squeezed 2.25W out. But it's SUPPOSED to be a 5W amplifier. Simulating it in Qucs-S without modification, I get 1.5W. My version: 2.2W. Th

This is the current state of my homebrew 20m SSB rig. All working. Haven’t gotten a QSO yet due to low power from the amp. Only running about 1W PEP SSB right now. The screen in the front hosts my own homebrew STM32 frequency counter that tracks the analog VCO. The trigger circuit is all discrete analog stuff that generates a digital-like signal that the STM32 counter can track. #HamRadio #Amateur

8 views This is the current state of my homebrew 20m SSB rig. All working. Haven’t gotten a QSO yet due to low power from the amp. Only running about 1W PEP SSB right now. The screen in the front hosts my own homebrew STM32 frequency counter that tracks the analog VCO. The trigger circuit is all discrete analog stuff that generates a digital-like signal that the STM32 counter can track. #HamRadio #Amateur

I finished the fist pass at the case for the JBOT QRP amplifier. I wish the print were a little better but I’ll use this one for awhile. I put a little fan in the top that plugs into the board for additional cooling. Note that this is all built around the piece of wood that everything is mounted to. #HamRadio #amateur_radio

7 views I finished the fist pass at the case for the JBOT QRP amplifier. I wish the print were a little better but I’ll use this one for awhile. I put a little fan in the top that plugs into the board for additional cooling. Note that this is all built around the piece of wood that everything is mounted to. #HamRadio #amateur_radio

I'm headed on vacation & may not get to test it out beforehand. I simulated Pete N6QW's LBS QRP power amplifier and modified it a little, to look clean in the simulator, and to substitute the 2N3866 for a Soviet KT646A that I have. This one looks like it can produce the proper power! So I built it yesterday. The biasing all checks out on the first two stages. Need to run a signal through them and

6 views I'm headed on vacation & may not get to test it out beforehand. I simulated Pete N6QW's LBS QRP power amplifier and modified it a little, to look clean in the simulator, and to substitute the 2N3866 for a Soviet KT646A that I have. This one looks like it can produce the proper power! So I built it yesterday. The biasing all checks out on the first two stages. Need to run a signal through them and

📊 Post engagement

📊 Activity & format

Posting cadence

2.4 / week

Posts several times a week.

Content mix

Mostly images

Recent: 6 text · 6 image · 0 video.

Follower / following

1.5×

Follows 373 back. A more reciprocal / networked account.

Recent posts

View on Mastodon ↗

🔥 Top post I should have simulated this first! I spent an inordinate amount of time on VU2ESE Farhan's 5W JBOT amplifier and was unable to squeeze more than about 1.6W out of it. I took matters into my own hands, replaced some transistors with hotter models, rebiased, and squeezed 2.25W ou… ★ 8

Lowe’s emailed because they would like me to review my recent purchase. It was a 20oz bottle of Coca Cola. ★ 2 https://www.theguardian.com/business/2026/jul/28/qantas-plane-flies-for-more-than-24-hours-in-record-breaking-flight This just sounds like hell to me. 24+ hours flight time is impressive and awful all at once. ★ 3

Didn't get to finish testing, but it's good up through the second stage. Not quite a perfect sine wave, but I'll take it for now. ★ 4

I'm headed on vacation & may not get to test it out beforehand. I simulated Pete N6QW's LBS QRP power amplifier and modified it a little, to look clean in the simulator, and to substitute the 2N3866 for a Soviet KT646A that I have. This on… ★ 6 https://www.vu2ese.com/index.php/2020/06/19/jbot-an-easy-qrp-linear-amplifier/ Hey LinkedIn, I don’t give a crap about puzzles! ★ 4

Something looking very hacked in Apple Translate. This Russian datasheet DOES NOT say that. If you scan it with Apple Translate there is all this “I’m sorry” etc all over it. It returns different results on different scans! 3rd image is fr… Just found an awesome place in Bulgaria where I was able to order some cool RF parts, including some interesting ex-Soviet power transistors for quite reasonable money. ★ 7 Got new fiber Internet service from Vodafone. I only paid for 1 gigabit. Which is supposedly the same speed as the Virgin cable modem. But this gigabit (very close to an actual gigabit) is about 300 megabits faster than the “gigabit” cable… ★ 5

This is the current state of my homebrew 20m SSB rig. All working. Haven’t gotten a QSO yet due to low power from the amp. Only running about 1W PEP SSB right now. The screen in the front hosts my own homebrew STM32 frequency counter that … ★ 8

I finished the fist pass at the case for the JBOT QRP amplifier. I wish the print were a little better but I’ll use this one for awhile. I put a little fan in the top that plugs into the board for additional cooling. Note that this is all … ★ 7

🐘 Community & instance

Home server

mstdn.social

A large general-interest Mastodon server. On the fediverse the server a creator picks hints at their community — this one spans all topics.

✅ Link-verified

Verified link

Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.

On Mastodon since

Apr 2022

An established account with real history on the platform.

💡 Facts

🗓️Joined Mastodon in 2022 — 4 years ago.

👁️Averages 5 views per post.

📤Posts about 2.4× per week.

📍Based in Ireland.

🕵️ Fake follower check

Estimated

52/100

Fair Credibility score

76%

Mixed Real audience

Medium Fake-follower risk

High Data confidence

Est. 76% real, active audience · Medium fake-follower risk.
Low engagement (~0.9% of followers engage each post) — a sign of an inflated or inactive audience.
Verified account.
Established account (4+ years old).

Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.

💚 Brand affinity

Estimated

Brands Karl Matthias 🇺🇦's audience is most likely to respond to — from detected sponsorships in this niche.

The Guardian

About

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 🇮🇪

📸 Gallery

🔀 Audience overlap

Estimated

Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

Mitchell Whitelaw 46%

Le Cripamphibie 18%

edovia 15%

FanthaTracks | Star Wars News 15%

Chris Wood 12%

Jace 🔥❤️‍🔥💖❤️ 10%

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FanthaTracks | Star Wars News ✓

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🏆 Awards & milestones

Next: 🟣 10K Followers — 9.5K followers to go

🛡️ Brand safety

✅Brand-safe90/100

✓ Verified / Partner account
✓ Established channel (4+ yrs)

A heuristic signal for brands from public data & recent titles — not a moderation verdict.

Details

PlatformMastodon

CountryIE

JoinedApr 2022 · 4 yrs

Followers549

Updated2 months ago

🤝 Brands they've worked with

✓ From their content

Sponsors Karl Matthias 🇺🇦 has actually partnered with — detected in their videos. Proof they take on & deliver brand deals.

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Karl Matthias 🇺🇦 has 549 followers on Mastodon.

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Karl Matthias 🇺🇦✓ Add us as a preferred source on Google

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Known for

📊 Post engagement

📊 Activity & format

Recent posts

🐘 Community & instance

💡 Facts

🕵️ Fake follower check

💚 Brand affinity

About

📸 Gallery

🔀 Audience overlap

More like this

Frequently asked questions

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