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#spectrum

13 posts11 participants1 post today

This touched a nostalgic nerve. I never knew the life paths of Clive Sinclair and Gary Kildall were so similar.

𝘼 𝙏𝙖𝙡𝙚 𝙤𝙛 𝙏𝙬𝙤 𝙍𝙚𝙙-𝘽𝙚𝙖𝙧𝙙𝙚𝙙 𝙑𝙞𝙨𝙞𝙤𝙣𝙖𝙧𝙞𝙚𝙨

nemanjatrifunovic.substack.com

Programming at the right level · A Tale of Two Red-Bearded VisionariesBy Nemanja Trifunovic
Replied in thread

@LaF0rge @kDelta @stman @Sempf espechally in places like #Germany where regulators like @BNetzA get record-breaking bids for #spectrum allocations solidly into the billions!

de.wikipedia.orgQuam – Wikipedia
#2g#quam#ecall
Replied in thread

@LaF0rge @stman @kDelta @Sempf obviously that's why it was discontinued for a time in #Germany, as it was considered as obsolete as #HSCSD is in light of faster standards that - even without guaranteed bandwith - will yield higher throughput.

  • Obviously #CellBroadcast will necessitate a constant bandwith allocation for functionality as it's design is based upon repeating a message until it's transmissiom being removed.

Still, even in contended #spectrum this is manageable, espechally since most #MNOs only maintain vestigal #2G or #3G infrastructure solely for #emergency coverage and reliability, as most phones will call emergency services over 2G and 3G and not via #VoLTE.

  • To add insult to injury, most BSCs will downgrade to 2G-only service by default in case of power loss to maximize UPS range and in the case of #NewZealand even switch off all services but #SMS & #EmergencyServicesCalling to enshure people in need can get their calls out, as the population is instructed to use SMS for person-to-person communication (as SMS is a low-priority, non-realtime service using excess bandwith and thus not compete with calling like #EDGE and #CSD would.
Infosec.SpaceKevin Karhan :verified: (@kkarhan@infosec.space)@stman@mastodon.social well, there were *some commercial services* that used #CellBroadcast but for the most part it's *best feature* is the effective mass alerting of people in an area without needing them to *install yet another app* or *signup to yet another service*... - The [temporary] shutdown of #CellBroadcast caused hundreds of avoidable deaths [in Germany alone.](https://en.wikipedia.org/wiki/2021_European_floods#Germany) @kDelta@mastodon.ie @Sempf@infosec.exchange @LaF0rge@chaos.social @nitrokey@nitrokey.com @signalapp@mastodon.world @GrapheneOS@grapheneos.social

A plot showing the #radio #frequency #spectrum usage rules in Germany around 800 MHz, relevant for #lora use in #reticulum & #meshtastic.
Data from data.bundesnetzagentur.de/Bund
#frequenzplan "Eintrag" number on the vertical axis corresponds to the "Eintrag" number listed in the link. If anyone knows the definition of "geringer Reichweite" in Eintrag 251004, please let me know. Is it permitted to create a #lora mesh network in the 863 to 870 MHz band in DE?
#863to870MHz #hamradio #869decimal525mhz

Continued thread

What is the reversal of infodumping? @actuallyautistic
(What would you label "being subjected to or seeking further information on a topic, possibly for current or future deepdive sharing"?)
Very interested in translations or interpretations in other languages, including gestural and/or sign language, if you know any and want to share.

Aw, I just thought of Info dunking. Ah well.
Let info damping be "to rain on someone's misinformation parade." [Maybe dampening? Idk. Linguists take the wheel.]

Did you know? Back in the 80ties Poland's #Elwro created quite good #ZX #Spectrum compatible Junior 800. With education in mind, they added networking! Now - thanks to Przemysław's hard work - you can build an exact replica with this open source project: github.com/codepainters/e800j

Down to original bodge wires with proposed mods and interactive BOM - this is a full blown education project on early computing and soldering. Need to flash a 2764 EEPROM? Can't find Intel DMA chip? Ask - small yet agile group of Elwro Junior 800 will help you!

Will I find weird star colors in non-typical stars?

1st photo - Zeta Herculis and Beta Draconis - high metallicity stars. North is to the left and captures the keystone asterism in Hercules in the upper right of the frame and the head of Draco in the lower left. High metallicity stars have more absorption features in their spectra compared to low metallicity stars.

To my eye, they don't exhibit weird color that is different than all the other stars in the frame.

en.wikipedia.org/wiki/Metallic

2nd photo - finder chart with these two stars circled in red.

3rd photo - Omicron Draconis is a star with emission lines in its spectrum. It's an RS Canum Venaticorum type of star and that is one of their defining characteristics. Again, it's color does not stand out as weird.

en.wikipedia.org/wiki/Emission

4th photo - finder chart.

I plan to image other emission line stars after monsoon ends.

A star with a weird color - Nova Lupi 2025 (V462 Lupi)

1st photo is not annotated. Can you find the nova?

2nd photo is annotated.

3rd photo was deliberately mis-focused so that stars were larger disks instead of small points. This makes it easier to see the color.

Note that there are plenty of orange stars and plenty of blue stars...but the nova has a unique color. To my eye it's a pale purple.

Why does the nova have a weird color?

4th image was taken from facebook.com/photo/?fbid=17712 it's a spectrum of the nova. Most stars have a blackbody radiation distribution, but novae (that's the Latin form, plural) have strong emission lines at discrete colors. That can make a weird color compared to most stars.

Image taken with a camera on a fixed tripod.

en.wikipedia.org/wiki/V462_Lup