Thread: Stratus 2S
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Old August 2nd 15, 06:49 AM posted to rec.aviation.soaring
Darryl Ramm
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Default Stratus 2S

On Saturday, August 1, 2015 at 9:51:11 PM UTC-7, Bill T wrote:
The airliner with ADS-B IN will get the traffic data rebroadcast from ATC and the 1202 traffic will show on his ADSB display.
I did not say that he would be able to discern the code, just that the ADSB-R would show the traffic.

BillT


You are assuming airliner CDTI equipment will display TIS-B traffic, and that CDTI has any capability of showing Mode A codes. Do you know that for sure? With what exact systems? You can't just assume what would be nice is actually how things work, especially in a highly regulated, complex and horrendously expensive transport category avionics, with TCAS/CDTI systems that have to work all over the world. Again, airliners are equipped with TCAS which really provides them with all the transponder based collision avoidance they need, and TCAS CDTI will not show Mode A codes.

The latest versions of TCAS II utilize hybrid surveillance where the TCAS systems receives 1090ES Out from nearby aircraft and uses that to augment position information/avoid excessive transponder interrogations/provide long range traffic display. TCAS does not use that data directly for issuing a TA or RA. AFAIK TCAS II hybrid surveillance relies on 1090ES Out from the target aircraft, it does not utilize UAT, ADS-R or TIS-B for this. If anybody knows different it would be great to know what exact system that is.