@quantensalat@astrodon.social
@quantensalat@astrodon.social avatar

quantensalat

@quantensalat@astrodon.social

Teacher (Maths, Physics, Energy and Experimental Lab courses), Lecturer, Author, lapsed high energy theorist
Signature signature (+,-,-,-)
... Ham Radio & electronics, Physics, Music, Math, Energy, ecomodernist tendencies
J.S. Bach & Metal stan account, vegetarian Pfälzer,
Call DK3HD, find me on 20&40m and our local repeaters ...
somewhere near Heidelberg, Germany
www.FACW.org DARC A20
www.ukw-tagung.org

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quantensalat, to hamradio
@quantensalat@astrodon.social avatar

Direct generation of radio waves using a special generator:

Next super long wave Grimeton transmission on 17.2 kHz will be on Alexanderson Day July 6, tuning of the transmitter 8:30 UTC, transmission 9:00 UTC

Since it is in the audio spectrum, It can be received in Europe using merely a long wire and a sound card input! More specialized loop or active antennas are advisable.

Quinnypig, to random
@Quinnypig@awscommunity.social avatar

I'm sorry Slack, you're doing fucking WHAT with user DMs, messages, files, etc? I'm positive I'm not reading this correctly.

quantensalat,
@quantensalat@astrodon.social avatar

@Viss @Quinnypig Autocompleting your competitors' designs sounds super convenient

pikarl, to random German
@pikarl@reporter.social avatar

Gestern Bürgerversammlung zum geplanten Windpark in . Sehr zivile Diskussion. Stadtwerke und sogar Polarisierer Palmer haben gute Argumente gebracht und die Bürgerinitiative („rettet den Rammert“) argumentativ entkräftet.

Aber auffällig: In dem 2-stündigen offenen Fragenteil ging es fast nur um uns, unsere Häuser, unser Wald, unsere Lebensqualität. Der einzige, der das große Ganze ansprach, die Wucht der Klimakrise im globalen Süden, unsere Pflicht selbst zu handeln, war der Pfarrer.

quantensalat,
@quantensalat@astrodon.social avatar

@pikarl @knud Aha! Die hatten da bestimmt belastbare Simulationen und Messungen parat um das zu stützen, oder ;-DD

steely_glint, to random
@steely_glint@chaos.social avatar

Thanks to @saghul for the perfect illustration of the problems with chatGPT:

quantensalat,
@quantensalat@astrodon.social avatar

@steely_glint @saghul

quantensalat, to hamradio
@quantensalat@astrodon.social avatar

Pretty unusual for south western Germany


stfn, to RaspberryPi
@stfn@fosstodon.org avatar

New blog post!

This one took weeks to write. It's about me finding a way to significantly reduce the power consumption of a Raspberry Pi Pico W working as a weather station, collecting environmental data.

I am also writing about powering the Pico using solar panels, and this time it's a success, my weather station can now run indefinitely, powered by the sun!

https://stfn.pl/blog/34-pico-power-consumption-solar-panels/

quantensalat,
@quantensalat@astrodon.social avatar

@stfn Hey,

we're using pi picos for envitonment sensors with a Tpl5110

quantensalat,
@quantensalat@astrodon.social avatar

@stfn Cool, I myself learned it from a friend who designs weather stations. The disadvantage is that the timing is not mega precise, in case that's needed.

Also, the ready made tiny boards sold by adafruit become unstable when driving picos (as opposed to arduino boards I supoose), and we had to add 1 Ohm resistors in series to dampen the start up current. Also, we had to pull down the cutoff pin gently to ground for it to reliably wake up again.

quantensalat,
@quantensalat@astrodon.social avatar

@stfn The pins are connected to ground (0 volts, negative supply) like so. When the pin is disenganged e.g because the raspi is turned off, the resistor makes sure that the pins go down to 0 Volts and don't remain charged. When the raspi turns the pin on, the resistor is large enough not to draw significant current.

quantensalat,
@quantensalat@astrodon.social avatar

@stfn The ground is 0V by definiton.. The pin thoigh is switched on to 3.3V to trigger the timer, and then has to go back to the value.0V, and that happens more reliably if the pin is connected to the 0V line.

Fischblog, to random German
@Fischblog@chaos.social avatar

Plaguemace in Weinheim. 🤘😁
Sehr geile Show, gerne wieder.

quantensalat,
@quantensalat@astrodon.social avatar

@Fischblog Wie war Crypta? Ich wär ja wieder hin wenn nicht gestern schon Konzert gewesen wäre.

quantensalat,
@quantensalat@astrodon.social avatar

@Fischblog Ah! Dann viel Spaß weiterhin

N4JAW, to amateurradio
@N4JAW@mastodon.radio avatar

Preparing for a activation & antenna testing in the forests of and waiting for to appear to help with some fun

quantensalat,
@quantensalat@astrodon.social avatar

@N4JAW Don't let Jarjar set up the antenna, you know how it will end

KC8JC, to random
@KC8JC@mastodon.radio avatar

Well. Gorgeous weather all week while I'm working.

Light rain ALL DAY Saturday AND Sunday.

That's... That's just dandy.

quantensalat,
@quantensalat@astrodon.social avatar

@ai6yr @kelvin0mql @tsherrygeo @KC8JC If 40 is open, we can be sure that you plugged in your antenna. Or did you forget a low pass filter in the chain ;)

N4JAW, to amateurradio
@N4JAW@mastodon.radio avatar

Different antenna today #qrp #EFHW #endfedantenna with 49:1 unun using @qrplabs #qrpradio #qrp #qcxmini #portapaddle for #amateurradio #hamradio #morsecode #parksontheair #pota activation. Sporting colors from across the pond. #unionjack #cyclingjersey and socks

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quantensalat,
@quantensalat@astrodon.social avatar

@N4JAW You always bring a smile to my face (and motivate me to get up to speed)

quantensalat, to hamradio
@quantensalat@astrodon.social avatar

Balloon WSPR Beacon upcoming

Dear Ham friends,
Weather permitting, on April 28. around 10 to 12 UTC, a student of mine will launch a weather balloon carrying a WSPR beacon on 20m in order to analyze the worldwide propagation as a function of altitude, based on WSPR report data.

It will probably broadcast our club call DL0WH or my own.

We'd be delighted if you turn on your receiver and see if you can spot us. Launch QTH will be Weinheim DL0WH.




quantensalat, to hamradio
@quantensalat@astrodon.social avatar

Anyone on the bands?

quantensalat,
@quantensalat@astrodon.social avatar

@pstuc No, I'm in DL ;)

quantensalat,
@quantensalat@astrodon.social avatar

@pstuc Band?

quantensalat,
@quantensalat@astrodon.social avatar

@pstuc Sorry that was a misunderstanding, I'm at an HF station in Germany

recursive, to random
@recursive@hachyderm.io avatar

This is one of my long-time interests. Ever since people started walking around with bluetooth devices, I assumed it would be a target for analysis. (Not many years later, it and wifi became a popular target for analyzing behavior of customers in retail stores)

Another fun one is TPMS sensors (though now that APLR is common, it's probably pointless).

But simple HUMINT/FININT works amazingly if you're positioned to collect it

https://woem.men/notes/9rashq4qjto6023i

quantensalat,
@quantensalat@astrodon.social avatar

@recursive CRTs were awesomely bad in that regard

Gammitin, to random
@Gammitin@mastodon.social avatar

My Sun SPARCstation LX NVRAM / Timekeeper chip is dead, not surprising as they have a life of 11 years and this thing is 32 years old. Let's do something about it!
(x86 fans, these are similar to Dallas time chips, but also have storage for system configurations)

quantensalat,
@quantensalat@astrodon.social avatar

@revk @Gammitin Is that a ram with a power supply for durability?

Gogs, to random
@Gogs@mas.to avatar

I watched C-beams glitter in the dark near the Tannhäuser Gate. Overrated.

quantensalat,
@quantensalat@astrodon.social avatar

@Gogs Why don't you go flip a tortoise?

quantensalat, to hamradio
@quantensalat@astrodon.social avatar

I have a whopping two contacts in my log from CQ-WW WPX SSB. I shall dutifully submit them, but have no high expectations that I'll win anything, except if they add a category for QSO with worst SWR (17).

quantensalat,
@quantensalat@astrodon.social avatar

@ai6yr It was a QSO on 80 with an antenna made for 40. But it was a friend two towns over, and I sent as much power in as I could. Of course such madness is only possible with a self built PA of which I know how much voltage margin the transistors can handle.

quantensalat, to mathematics
@quantensalat@astrodon.social avatar

Lake constance is 63km wide at its longest, and due to the curvature of the earth, this means that the center bulges almost 80 meters higher than the direct line between the shores. If you come to Da Capo restaurant in Lindau, you can now admire our calculation of this fact on their blackboard ;-)



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