Andreas, DJ3EI, he/him

#FridaysForFuture I'm a German scientist for future. Very concerned about dangers to coming generations through CO2, nuclear waste, nuclear war, mass extinction. Sustainability dear to my heart since reading "limits to growth" in 1978, never owned a car in my life. #hamradio #AmateurRadio QRP 5W inner city apartment amateur radio station. Enjoy #MorseCode, rag chewing, mining RBN / PSKreporter data, #JS8, low-mountain hiking (#GMA). You can see me at German #AfuBarcamp if you take part in those.

My personal blog: https://dj3ei.famsik.de/blog

Public Key

npub13waxuwj8pj2ktmc2w3z35jpc8xn3nk9qx7ucnka66s854ahsr56szw8n4z

NIP-05 Address

dj3ei_at_mastodon.radio@momostr.pink

Profile Code

nprofile1qqsghwnw8frse9t9au98g3g6fqurnfcemzsr0wvfmwadgr627mcp6dgpz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsjdeyte

Publishing to

public.relaying.io

relay.damus.io

nos.lol

Author Public Key

npub13waxuwj8pj2ktmc2w3z35jpc8xn3nk9qx7ucnka66s854ahsr56szw8n4z

Show more details

Last Notes

2026-04-02 21:23:52 UTC

- reply

I wonder whether the effect you so convincingly demonstrate is actually caused by earth's gravitational or magnetic field.
What happens if you just rotate the osc on the table, without changing tilt?
@npub16kj…kf5d @npub1043…um47

2026-01-27 02:54:35 UTC

- reply

Übliche KI ist trainiert mit Daten, die im Internet zusammengeklaut wurden. Hinweisschilder "keine KI-Trainer" werden ignoriert, virtuelle Zäune durchschnitten und Türen aufgebrochen. KI-Trainingsstaubsauger belasten alle möglichen Webserver viel mehr, als legitime Nutzer es je könnten. Auf den Kosten bleiben die Webserverbetreiber sitzen.
Insofern betrachte ich den Output von KI als Hehlerware.
@npub1kcq…ytud

2025-10-29 10:50:35 UTC

- reply

Occasionally, our wooden cutting boards end up in the dishwasher. I don't like to do that, but my wife insists. It sometimes leads to cracking of the boards. But we have not suffered health problems from doing this that we know of.
What exactly do you warn about, @npub17x4…u7yh ?
@npub1dzj…vpqn @npub13jc…xvz3

2025-06-16 05:38:51 UTC

- reply

A Fediverse toot with world distribution feels different to me. I would not think it is similar to me happening to overhear something being said on the bus. It is more like someone at a market stand handing out flyers and trying to engage people in a conversation. Yes, I feel invited to interact, in such a market situation in real life and also by any toot popping up in my timeline here in Fediverse, certainly if it is a world-distribution toot.
@npub1jpy…yfwv

2025-06-16 05:13:05 UTC

- reply

It seems to me that you are saying: Only friends or followers may ever criticize a person.
?
@npub1jpy…yfwv

2025-06-15 09:58:41 UTC

- reply

Thanks for the feedback. As you receive my critizism as "berate", I really need to rethink my approach. This is not what I want to happen.
The text I link to I think is polite and mild-mannered, but apparently, the way I brought it to your attention wasn't. (Or at least wasn't understood by you as such.)
Thanks for the conversation!
Have a nice day, too!
@npub1jpy…yfwv

2025-06-13 22:04:31 UTC

- reply

I intended to post a plain open criticism of your link with no summary. I just don't like those.
I find it amusing to hide my criticism against content hidden behind links behind a link, as a demonstration how obnoxious that practice is.
I don't think you enjoyed the surprise, did you?
Of course, it is a bit fishy to do the very thing I criticize.
I know a11y, but still have no idea what to expect behind your link. Is not following links I critizise passive aggressive? Maybe.
@npub1jpy…yfwv

2025-06-13 16:31:40 UTC

- reply

Your toot vividly recalled to my mind a short note I once wrote, which you can find at https://www.famsik.de/iplwc
@npub1jpy…yfwv

2025-03-28 16:37:46 UTC

- reply

Typical programms for #FT8 and #JS8 both have an ALL.TXT feature. When activated, any text your computer ever decodes and anything ever sent will be written to that file.
Personally, I find that quite useful for certain research, so I activate it. Yes, over the years, this file can get somewhat large, but not too large for modern hard drives IMHO.
Asking the FT8 and/or JS8 users among you: How do you handle this?
@npub1xaf…aqwx @npub1xuj…e70g

2025-03-28 16:19:46 UTC

- reply

If it was FT8 and if you had activated ALL.TXT at the time and if you still have that ALL.TXT today, there's a chance the data of that exchange is still available.
If and if and if, I know. Just saying.
@npub1xaf…aqwx @npub1xuj…e70g

2025-01-19 21:43:57 UTC

- reply

"My only worry is ..."
🤔
In case you are in short supply of worries to worry about: The power supply could generate HF noise that ruins your reception.
I wish you luck it doesn't!
@npub133k…fazx

2025-01-08 22:01:55 UTC

- reply

"Dazu müssen wir alle die Kosten tragen, die die Folgen der Klimakrise verursachen."
"Wir alle" sind schon gestorben, wenn die Klimakatastrophe erst richtig zuschlägt. Wir triggern nur jetzt gemütlich die Kipppunkte und machen uns dann vom Acker.
@npub1cqg…5jsw @npub1g3u…nvuc

2024-12-31 10:05:01 UTC

- reply

I won't be telling you any such thing.
You could build a small-scale model of that with two lowly ferrite toroids that are kept a mm apart, and run the "three inductance values" experiment, with no short circuit, a short circuit loop through only one core, or a short circuit loop through both. And compare the outcome with that of a binocular core.
If nobody does it before then, I might run these experiments next weekend or so.
@npub1dgh…gkrs @npub1akz…cn50 @npub133k…fazx

2024-12-30 23:22:43 UTC

- reply

I like that picture.
What do I like about it?
A single dashed core line connecting the upper primary with the entire secondary.
To function, that is needed imho. Coupling from the tube, i.e., the winding in one hole, to the entire secondary through both holes.
@npub1akz…cn50 @npub1dgh…gkrs @npub133k…fazx

2024-11-21 16:25:19 UTC

- reply

December 1, 2024 at 10 UTC, if all goes well, the historic #MorseCode transmitter SAQ in Sweden will transmit to commemorate its own entering service 100 years ago that day.
https://grimeton.org/en/2024/11/12/saq-to-air-on-dec-1st-100-years-of-communication/
The 80 kW signal is generated by a venerable electromagnetic device, the Alexanderson alternator.
https://alexander.n.se/en/the-radio-station-saq-grimeton/the-alexanderson-transmitter/
With appropriate equipment, its extremely low frequency 17.2 kHz signal can be picked up several 1000 km away from Grimeton. Original target area was New York, USA.
@npub1kat…mhvc

2024-11-08 07:55:03 UTC

- reply

My dorky μC side project:
Plan: Build a radio-controlled clock that correctly displays the next leap second (whenever that happens) as ”XX:59:60” (the "XX" part depending on time zone, probably "00”) in a big red LED display.
Actually achieved: A quartz bedroom clock that displays time, battery powered, not yet radio controlled, still keeps time to about 1 second per month, as I compensated the cheap clock-quarz's imprecision in software. Display is dim LED consuming 5 mW.
@npub1jh4…eag0

2024-10-28 10:13:16 UTC

- reply

I'm happily surprised to read in your toot "trump ... is being sanctioned".
In what way?
But to be honest, I'm also a bit afraid you were temporarily confused by your own overly long sentence and ended up forgetting a crucial "n't".
(Happens to the best of us.)
@npub120y…a3vs @npub1lq6…nf7e

2024-10-09 21:36:35 UTC

- reply

#HamRadio handheld VHF/UHF transceivers typically sport antennas roughly 8 cm long. Those have two main properties:
- Their small size makes it easy to carry the handheld around or stow it.
- They are a disaster performancewise. Especially on transmit, they don't even start to let you experience what your handheld is really capable of.
Antennas abt 30 cm long are a LOT better electrically. 🧵
Also, it is fun to occasionally use a handheld with a serious station antenna.
@npub1zc4…n8qu @npub1au4…yugq

2024-09-23 13:52:10 UTC

- reply

I am a Linux-only and FLOSS-loving person and have been asking those questions, too, but more to myself than to the Fediverse, so you're smarter!
I stumbled over https://getpat.io/ and wanted to try that out eventually, but haven't yet. This may or may not be pertinent. If you do the homework I've been procrastinating... 😁
@npub1dgh…gkrs @npub133k…fazx

2024-08-27 06:56:56 UTC

- reply

That much is shared by a lot of people, including me.
One difference between the two of us is, you apparently view the Holocaust as a typical example of the kind of things all states do all the time.
@npub1s02…zz9t @npub1l27…zpk4

2024-08-27 06:36:51 UTC

- reply

The state monopoly of physical violence is a major civilisatory achievement. It took centuries of hard work to abolish the feud system, back in the middle ages. Today, people still in conflict with that monopoly include anarchists 🧵, robbers, protection money blackmailers, kidnapping extortionists, pirates, war lords, the mafia. It takes a fanatic hatred of everything the state does to view the state violence monopoly and #RuleOfLaw as fundamentally bad things.
@npub1l27…zpk4 @npub1s02…zz9t