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542
Account age
4 yrs
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🧰 Free analysis for Karl Matthias 🇺🇦
Known for
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
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
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
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
5
Avg engagement / post
0.9%
Engagement vs followers
Apr 2022
On Mastodon since
🔥 Top post: I should have simulated this first! I spent an inordinate amount · 8 likes + reposts
📊 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 367 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…
Lowe’s emailed because they would like me to review my recent purchase. It was a 20oz bottle of Coca Cola.
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.
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.
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…
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!
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.
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…
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 …
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 …
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.
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…
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!
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.
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…
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 …
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 …
🐘 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.
🕵️ Fake follower check
Estimated75/100
Good
Credibility score
92%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 92% real, active audience · Low fake-follower risk.
- Engagement (~0.9% of followers engage each post) is around typical for Mastodon.
- Verified account.
- Established account (4+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
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 🇮🇪
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