Mode S

[crxcte]

I got a adsb gtx330 that uses mode S for traffic avoidance.  Works great but seems like it still is monitoring non adsb transponders.  Anyone know what mode s is tracking now?

[toto]

I don’t think the GTX 330 has a TIS receiver, and the Mode S is only broadcast, so you must have some other receiver for TIS-B?

In any case, your TIS-B receiver includes traffic that is not broadcasting ADS-B out. If they have a discrete transponder code and they’re in range, you'll see them. 

[Marc_B]

I have a GTX330ES that’s 1090ES and ADS-b out, but GDL88 that’s ADS-b in. 

[LANCECASPER]

13 hours ago, toto said:

I don’t think the GTX 330 has a TIS receiver, and the Mode S is only broadcast, so you must have some other receiver for TIS-B?

In any case, your TIS-B receiver includes traffic that is not broadcasting ADS-B out. If they have a discrete transponder code and they’re in range, you'll see them. 

The GTX330 was designed to receive TIS-A, which was traffic around Class B & C airspace. It doesn't receive TIS-B. https://aeroscanservice.com/en/Traffic_Information_Service

The GTX-330ES (Extended Squitter) broadcasts a WAAS-based position on 1090, and is "ADS-B out". You still need another receiver, panel or portable, for "ADS-B in".

 

[toto]

5 minutes ago, LANCECASPER said:

The GTX330 was designed to receive TIS-A, which was traffic around Class B & C airspace. It doesn't receive TIS-B. https://aeroscanservice.com/en/Traffic_Information_Service

The GTX-330ES (Extended Squitter) broadcasts a WAAS-based position on 1090, and is "ADS-B out". You still need another receiver, panel or portable, for "ADS-B in".

 

Thank you. I made the bad assumption that we were talking about the 330ES. I thought OP was saying that the GTX was receiving both TIS-B and TIS-A traffic. 

[PT20J]

The original mode S Traffic Information Service (TIS) was initiated in 2000 and is being phased out as of June 2023 as ground radars are updated.  https://www.federalregister.gov/documents/2023/06/23/2023-12607/changes-to-surveillance-and-broadcast-services

This does not affect TIS-B (Traffic Information Service - Broadcast) which is a separate ADS-B service. 

I don’t believe the FAA ever referred to any service as TIS-A. Some sources seem to have invented that acronym to further differentiate TIS from TIS-B.

[toto]

40 minutes ago, PT20J said:

The original mode S Traffic Information Service (TIS) was initiated in 2000 and is being phased out as of June 2023 as ground radars are updated.  https://www.federalregister.gov/documents/2023/06/23/2023-12607/changes-to-surveillance-and-broadcast-services

This does not affect TIS-B (Traffic Information Service - Broadcast) which is a separate ADS-B service. 

I don’t believe the FAA ever referred to any service as TIS-A. Some sources seem to have invented that acronym to further differentiate TIS from TIS-B.

I had only ever heard TIS until TIS-B came around. I interpreted Lance’s TIS-A reference above as “the thing before TIS-B.”

[PT20J]

9 minutes ago, toto said:

I had only ever heard TIS until TIS-B came around. I interpreted Lance’s TIS-A reference above as “the thing before TIS-B.”

If you Google TIS-A, you will find references to it. It seems to have indeterminate origins and has crept into common usage. But, it was never official. I think it’s confusing because it implies that -B is an indicator of order as in B comes after A, but that is merely coincidental. The B signifies Broadcast.