aallan, to SpaceX
@aallan@mastodon.social avatar
zeroiee, to random
@zeroiee@techhub.social avatar

With and mobile connections, the demands on the voltage sources have also increased: In particular high peak currents of approx. 4 A @ 3.7 V and more can push some circuits and the voltage converters installed in them to their limits.

In the event of stability problems with mobile radio modems, it is therefore particularly worth taking a brief look away from the software and towards the hardware. Can the power supply really meet the high requirements? An examination with an oscilloscope shows even the smallest fluctuations in the millisecond range and can reveal possible problems.

In our specific case, we are investigating stability problems with a new modem, which can only be reproduced unreliably. In the video you can see that even small pings have a visible effect (voltage fluctuations of approx. 800 mV) on the voltage source.

Video shows terminal with ping command in it. Camera moves to oscilloscope, which shows tiny voltage drops in the same interval as pings are sent (one per second).

ian, to random
@ian@phpc.social avatar

Thanks to borrowing an eSIM from @zonuexe, I've now tested all four physical Japanese mobile networks, including the elusive Rakuten Mobile. My phone didn't lock onto their , but seeing on them was good enough.

That's in addition to LTE and 5G on SoftBank and NTT, plus LTE on KDDI, that I was able to source myself :)

Yep, I'm that much of a cell network nerd. Any questions?

image/jpeg

m0bi13, to internet Polish
@m0bi13@pol.social avatar

W związku z ostatnim przetargiem na częstotliwości LTE które wygrały duże GSM-y, z rynku znikną mniejsi niezależni dostawcy, którzy świadczyli usługi dostępu do internetu w technologii LTE.

Doszły mnie słuchy, że w takich przypadkach obowiązuje rok "karencji", nie można ot tak wejść w te częstotliwości i "zagłuszyć" sygnał tych niezależnych dostawców (przez rok?).

Macie może wiedzę albo linki, bym mógł doczytać, jak to jest w praktyce?
Co może taki "mały" dostawca w tej sytuacji?
A może to bujda i nie ma żadnego okresu przejściowego?

Edit: prosiłbym wyjątkowo o podbicie 🚀

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