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Old 12-28-2013, 03:09 PM
sailvi767 sailvi767 is offline
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,285
Default ADSB traffic Issues Freeflight Explorer

I thought I would post something interesting concerning a issue with ADSB traffic. We have been flying with a new panel. The basics are a AFS4500 with a Freeflight explorer ADSB box and a Trig22 transponder.
We have been getting traffic however it has always seemed very limited and only on a very rare occasion did we ever see a ADSB target. Most targets were TisB and even then we did not seem to be getting the complete picture. The Freeflight explorer is a 978UAT box and is far as I know not a dual band so no 1090 comm.
I decided to review all the setting in a attempt to improve performance. In checking to make sure that the Trig22 was properly configured and sending the 978 request signal I noted it was enabled properly. I also however noted that the 1090 mode was also enabled. I disabled the 1090 mode in the Trig setup simply because it was not needed. I did not expect it to have any bearing on the traffic issue. With no other changes made in any setup items I went up on a short flight to try and improve my wheel landings. I was very surprised to find that shortly after liftoff I had 11 ADSB targets! The entire flight I was seeing traffic like never before. Kind of scary actually. Lots of people out flying today.
I do not understand why disabling the 1090 mode in the transponder seems to have fixed the traffic issues and I would like to get a few more flights to confirm things but I saw more traffic on one flight today then I have seen on the last 20 flights before. Never have I had more then 1 ADSB target and normally none on a flight and today I always had at least one and up to 11. The only thought I have is that somehow having the 1090 mode enabled caused the TRIG to limit or not send the 978 requests. Perhaps because 1090 is considered a better mode.
If anyone is running a similar setup and feels they are not seeing as much traffic as the should check and make sure you have only the modes enabled in the transponder that your box is capable of. It seems to have made a huge difference in our aircraft.


Last edited by sailvi767 : 12-28-2013 at 03:11 PM.
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