ADS-B Traffic target problem
Moderators: Rick, Lance Murray
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
ADS-B Traffic target problem
I recently upgraded to the GTX 345r transponder, with all the ADS-B in out/TAS600 integration, etc. (report to follow in install experience thread), and am having an issue with some of the TIS-B targets (non-ADS-B equipped in radar area) showing a blank identifier field with it. Usually, these TIS-B targets show with only target symbol and relative elevation, and no identifier field attached, but sometimes, I get a whole mess of them showing with a dashed out identifier field. Attached pic shows one (+11 in middle of screen). Sometimes I see none, yesterday, had 10-15 on my screen at once. Is this behavior others have seen? Also, it does not appear that the other ADS-B equipped planes are showing up to me in "ground mode" (brown symbols). I was sitting in run-up area next to another plane that showed up as ADS-B target with identifier as soon as airborne, but did not show up on the ground. Any thoughts?
Last edited by smoss on Mon Oct 01, 2018 9:47 pm, edited 1 time in total.
Steve
DA40 XL
DA40 XL
- DaveS1900
- 3 Diamonds Member
- Posts: 65
- Joined: Sun May 06, 2018 1:09 am
- First Name: Dave
- Aircraft Type: DA40
- Aircraft Registration: N521DD
- Airports: I74 Urbana Ohio
- Has thanked: 5 times
- Been thanked: 28 times
Re: ADS-B Traffic target problem
Steve,
We have the GTX 345r also in our DA40. On occasion a target with no details is shown (TAS600) and a target with direction and altitude (ADSB) is shown. The no-details target jumps around a bit and after a couple of minutes merges into the ADSB target. I take it to be that the TAS600 is trying to work out if its target is the same as the ADSB target. Eventually it figures out that the targets are the same airplane and merges them. It may be that your TAS600 is having a hard time determining distance and direction which leads to the "extra" targets.
Dave
We have the GTX 345r also in our DA40. On occasion a target with no details is shown (TAS600) and a target with direction and altitude (ADSB) is shown. The no-details target jumps around a bit and after a couple of minutes merges into the ADSB target. I take it to be that the TAS600 is trying to work out if its target is the same as the ADSB target. Eventually it figures out that the targets are the same airplane and merges them. It may be that your TAS600 is having a hard time determining distance and direction which leads to the "extra" targets.
Dave
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
Re: ADS-B Traffic target problem
Nope, the targets are real. They are TIS-B targets that will show up on iPad via Scout/foreflight and show as TIS-B if tapped on. Sorry, forgot to attach pic to first post--added it.
Steve
DA40 XL
DA40 XL
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
Re: ADS-B Traffic target problem
Dave, do you ever see the identifier field with all dashes like in my pic?
Steve
DA40 XL
DA40 XL
- CFIDave
- 5 Diamonds Member
- Posts: 2678
- Joined: Wed Nov 07, 2012 3:40 pm
- First Name: Dave
- Aircraft Type: OTHER
- Aircraft Registration: N333GX
- Airports: KJYO Leesburg VA
- Has thanked: 231 times
- Been thanked: 1473 times
Re: ADS-B Traffic target problem
No, I've never seen that before. (However lately I've spent more time flying DA40 NG models with G1000 NXi and GTX345R, rather than Legacy G1000 DA40s retrofitted with the GTX345R.)smoss wrote:Dave, do you ever see the identifier field with all dashes like in my pic?
I'm wondering if the target aircraft displayed with dashes is using a UAT ADS-B transponder that the owner switched to "Anonymous Mode" for privacy -- something that's unavailable with our ADS-B 1090ES transponders.
Last edited by CFIDave on Tue Oct 02, 2018 1:25 pm, edited 1 time in total.
Epic Aircraft E1000 GX
Former DA40XLS, DA42-VI, and DA62 owner
ATP, CFI, CFI-I, MEI
Former DA40XLS, DA42-VI, and DA62 owner
ATP, CFI, CFI-I, MEI
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
Re: ADS-B Traffic target problem
Dave, they are not ADS-B out aircraft, they are all Mode C/S targets that are being rebroadcast by TIS-B (as shown using Scout ADS-B in and ForeFlight)
Steve
DA40 XL
DA40 XL
- DaveS1900
- 3 Diamonds Member
- Posts: 65
- Joined: Sun May 06, 2018 1:09 am
- First Name: Dave
- Aircraft Type: DA40
- Aircraft Registration: N521DD
- Airports: I74 Urbana Ohio
- Has thanked: 5 times
- Been thanked: 28 times
Re: ADS-B Traffic target problem
Steve,
I'll bet those are standard radar targets that are VFR. The radar knows the alt but not the call sign. The radar data gets sent over to the ADSB transmitter which sends the data to you. But no call sign since ATC isn't talking to them.
Dave S.
I'll bet those are standard radar targets that are VFR. The radar knows the alt but not the call sign. The radar data gets sent over to the ADSB transmitter which sends the data to you. But no call sign since ATC isn't talking to them.
Dave S.
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
Re: ADS-B Traffic target problem
Agreed, that's what they are, but shouldn't they just display the symbol and altitude, without the extraneous empty field?
Steve
DA40 XL
DA40 XL
- Rick
- 5 Diamonds Member
- Posts: 1575
- Joined: Tue Jul 06, 2010 10:09 pm
- First Name: Rick
- Aircraft Type: DA40
- Aircraft Registration: NONE
- Airports: KROA
- Has thanked: 107 times
- Been thanked: 297 times
Re: ADS-B Traffic target problem
You would hope so, right? Maybe this particular radar site explicitly sends dashes for the callsign when it's unknown, instead of just leaving it blank, so that's what the G1000 displays?smoss wrote:Agreed, that's what they are, but shouldn't they just display the symbol and altitude, without the extraneous empty field?
Roanoke, VA (KROA)
- smoss
- 5 Diamonds Member
- Posts: 742
- Joined: Sun Dec 12, 2010 12:18 am
- First Name: Steve
- Aircraft Type: DA40
- Airports: KVGT
- Has thanked: 57 times
- Been thanked: 134 times
Re: ADS-B Traffic target problem
That may be. Particularly in Las Vegas I see a ton of them, whereas between Los Angeles and here, don't recall seeing any.
Steve
DA40 XL
DA40 XL