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#avionics

4 posts3 participants0 posts today
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

The glider's transponder (TRIG TT22) has been successfully tested in the garage. Woo hoo!

After configuring the device, I put it through some initial tests.

Even in the garage the GPS antenna can get a position fix.

Applying higher or lower pressure to the static port on the transponder shows a corresponding change on the displayed altitude.

Applying pitot tube air pressure to the squat switch changes the transponder mode from ground to airborne, which is what we want.

Note: I can't test the radio/antenna/transmission capabilities in the garage. And anyway, I need to get the transponder checked at an avionics shop...they have specialty test equipment.

#AvGeek#Aviation#ElectricAircraft
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

The glider's flight computer is successfully working in the garage! Woo hoo!

1st photo - XCsoar software has been loaded, showing a map and terrain data for New Mexico. (Airspace boundaries I'll add tomorrow.) No GPS data at the moment.

2nd photo - FLARM powered up, green status light...so it's got a GPS fix. Now to configure the glide computer to receive the FLARM data...GPS position as well as info on nearby aircraft. This is a debugging screen that shows I'm getting a meaningful data stream.

3rd photo - now the map is properly located because we have a GPS fix.

4th photo - Even with antennae casually draped over the fuselage, I'm getting ADS-B data of airliners miles away!

I also tested the three pneumatic inputs to the glide computer: pitot, static, total energy. They all cause the glide computer to respond in the correct manner.

#AvGeek#Aviation#ElectricAircraft
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

Aircraft and glider transponder codes - FAA gotcha.

I have not yet received my glider registration from the FAA (any day now, lol!), but they have assigned a transponder code for the N-number I have reserved. (see first screenshot)

To configure my avionics, I need to load this transponder code into the device.

FLARM wants it as a 24-bit hexadecimal value. (Each hexadecimal value is 4 bits in binary...so it's going to be a six-character code...but my code is not six characters.)

Hmmmm, that number the FAA gave me just doesn't seem correct.

I then called up a known, long-registered aircraft to compare their transponder code. (2nd screenshot)

Surprise! The transponder code I was given was in octal, but not labeled as such. OK, convert to hexadecimal and now everything makes sense.

Onward!

#AvGeek#Aviation#ElectricAircraft
Replied in thread
Kevin Karhan :verified:

@libreleah @ariadne the closest to it is like the way Microsoft basically implemented 2 independent systems with completely vietualized and abstracted access in the #XboxOne which is AFAIK still unhacked.

infosec.space/@kkarhan/1128436

But their intention in terms of #security is inherently anti-user and would only be acceptable in #CriticalInfrastructure like #Avionics where you'll have to prevent malicious users from ramming a plane into the ground!

As for mass-adopted systems, I'd say that #Android (aka. #toybox + #musl / #Linux + ART) with it's #Java-#VM is the best compromise after hardened Linux-distros, BSDs with #bhyve & #jails and "#KISS-principled" #OpenBSD which all buy security at the expense of control, modablility and portability.

Infosec.SpaceKevin Karhan :verified: (@kkarhan@infosec.space)@dalias@hachyderm.io @sam@trapped.genoq.org @ariadne@treehouse.systems potentially yes. I think it's safe to look at the way #Microsoft kept the #XboxOne watertight to this day: https://youtu.be/U7VwtOrwceo Nit everything of it is applicable tho and their implemebtation requires custom silicon and microcode but ideally any I/O would be restricted to hard-sandboxed ranges and thus denied access to anything outside it. I had lenghtly conversations with @stman@mastodon.social about this whole issue and any interface like #PCIe would've to be basically sandboxed on low level and denied random I/O access entirely outside of that "IO-mapped address space"...
#kiss
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

@ai6yr

A friend has a problem with EMI. Can anyone give him ideas to help troubleshoot?

It's an aircraft avionics issue in a glider cockpit. Everything is powered by battery.

He's not on Fedi/Mastodon.

His description is below.

Thanks in advance!

====================
I have 2 electrical devices that are causing interference with any nearby radio. Initially, I thought it was just my radio but it's any radio. So, I am no longer looking for an issue with my radio or antenna.

However, I did find a spectrum analyzer that can also generate a frequency simulating EMI (I think)

For testing purposes, I supplied each device with a separate battery.

I tried using foil around the 12v USB and variometer. Again, with no change. I also tried foil around the radio.

Not the best Faraday cage.

Usually, I get some sort of change. But not in this case

#EMI#RadioInterference#Troubleshooting
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