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Questions tagged [mode-c]

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Can an aircraft transmit Mode C when Mode A is in STANDBY or OFF?

I am a software developer in the aviation industry, so I do apologize if my terminology is not correct. What I want to know is - are there any cases in which the aircraft's Mode A is switched to OFF ...
Indigo's user avatar
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0 votes
0 answers
81 views

How does ADS-B get pressure altitude? [duplicate]

I have learned that ADS-B out broadcasts both Pressure altitude and GPS Altitude. GPS altitude is, obviously, available from the GPS, but where and how does it determine pressure altitude? Does it ...
Charles Bretana's user avatar
9 votes
1 answer
2k views

Does ADS-B use its own antenna?

In the aircraft we have: ADS-B out/in using 1090ES A/C or Mode S transponder for SSR grounding interrogation. Does the ADS-B out use the same antenna as Mode S or does it use its own antenna?
Oussama SDR's user avatar
4 votes
1 answer
765 views

Does the ATC not receiving Mode C and intermittently other transponder information imply that the Mode S transponder itself has an issue?

I had ATC report to me inflight today that they were not receiving my Mode C (altitude data). Intermittently, they also reported they were not seeing any other transponder information. My transponder ...
Charles Bretana's user avatar