Hector Martin on Twitter: "You seem to have issues understanding the concept that a signal that repeats on a 16.66 ms cycle is mains noise. I don't care what it looks like. It's going to look different for different PSUs. It's still mains noise. Protip: your scope isn't going to show you "RF" at 1ms/div.… https://t.co/StnuDza4wU"

Country	Code	For customers of
United States	40404	(any)
Canada	21212	(any)
United Kingdom	86444	Vodafone, Orange, 3, O2
Brazil	40404	Nextel, TIM
Haiti	40404	Digicel, Voila
Ireland	51210	Vodafone, O2
India	53000	Bharti Airtel, Videocon, Reliance
Indonesia	89887	AXIS, 3, Telkomsel, Indosat, XL Axiata
Italy	4880804	Wind
3424486444	Vodafone
» See SMS short codes for other countries

Joe Fitz‏ @securelyfitz 12 Jun 2018

Report Tweet
Report NetzDG Violation

It's ok everyone! I confirmed it's just a fan. Except now it isn't even that anymore, but it's safe to use. That is, until I reassemble it :)pic.twitter.com/ZKBCOv4ExU

9 replies 18 retweets 114 likes

Show this thread

Cybergibbons‏ @cybergibbons 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @securelyfitz

I want to see you go @dragosr on that connector.

1 reply 2 retweets 16 likes

SethOps‏ @swordofomen 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @cybergibbons @securelyfitz @dragosr

dammit beat me to it. (btw is that USB C?)

2 replies 0 retweets 4 likes

dragosr‏ @dragosr 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @swordofomen @cybergibbons @securelyfitz

It does look like that doesn’t it. But I’m connected to the audio jack and Ethernet shield! Oh also, it’s dynamic and changes. But only if a cable is plugged in (USB or HDMI) don’t even need anything at the other end of the cable (!) exercise for reader: read dwc_otg dev notespic.twitter.com/oyyvPeDMOQ

4 replies 0 retweets 1 like

Hector Martin‏ @marcan42 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @dragosr @swordofomen and

"don’t even need anything at the other end of the cable" Congrats, you've discovered that disconnected cables make a great antenna to pick up EMI from the environment. Now grab a long piece of copper wire, hook it up to your scope probe, and observe the same thing.

2 replies 0 retweets 21 likes

dragosr‏ @dragosr 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @marcan42 @swordofomen and

Well it’s RF interference @ ~60Hz that looks just like usb and seems to change airgapped Raspi boot when present. Other than that, probably completely boring, so maybe I should ignore it?

1 reply 0 retweets 0 likes

Hector Martin‏ @marcan42 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @dragosr @swordofomen and

Help, my fingers seem to be infected with #BadBIOS2! The virus is modulating airgap crossing communications using 50Hz ASK! Should I see a doctor??pic.twitter.com/Nh52dFt6xp

4 replies 10 retweets 45 likes

SethOps‏ @swordofomen 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @marcan42 @dragosr and

Oh snap you have the Thetans!

1 reply 0 retweets 1 like

dragosr‏ @dragosr 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @swordofomen @marcan42 and

You are so hung up on the ground that you are missing the point about the picked up RF. Pictures on the left are without the signal, floating ground (batt scope), pictures on the right are with signal, same measurement, same device, same cables, same location. Note impulses.pic.twitter.com/78L8yVCofg

1 reply 0 retweets 0 likes

Hector Martin‏ @marcan42 12 Jun 2018

Report Tweet
Report NetzDG Violation

Replying to @dragosr @swordofomen and

You seem to have issues understanding the concept that a signal that repeats on a 16.66 ms cycle is mains noise. I don't care what it looks like. It's going to look different for different PSUs. It's still mains noise. Protip: your scope isn't going to show you "RF" at 1ms/div.

9:40 AM - 12 Jun 2018