Ravioli
Ejection Handle Pulled
- Joined
- Dec 1, 2014
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- 8,021
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Unwanted Guest - Perma-ban Pending
Looked around a bit first, and probably old territory, but here it comes:
My Mode C transponder (GTX327) uses an external altitude encoder in my EFIS. I adjust barometric pressure in my EFIS and it matches 'closely' to my standby altimeter (steam) when the baro is set the same. That's all fine.
The GTX327 always displays Pressure Alt, fed from the EFIS.
Technical questions:
Is the mode C sending the pressure alt, the corrected alt, or both to the ground station?
Is the ground station using making 'automagic' corrections?
I know that at Flight Levels it's 29.92 all day, but there is a question about the display difference on the VAF forum and I thought I'd ask hear since there are plenty of people on the scopes who probably know.
Thanks!
My Mode C transponder (GTX327) uses an external altitude encoder in my EFIS. I adjust barometric pressure in my EFIS and it matches 'closely' to my standby altimeter (steam) when the baro is set the same. That's all fine.
The GTX327 always displays Pressure Alt, fed from the EFIS.
Technical questions:
Is the mode C sending the pressure alt, the corrected alt, or both to the ground station?
Is the ground station using making 'automagic' corrections?
I know that at Flight Levels it's 29.92 all day, but there is a question about the display difference on the VAF forum and I thought I'd ask hear since there are plenty of people on the scopes who probably know.
Thanks!