Peter wrote:
Can the TRX display any uncertified ADS-B targets?
I have no idea. The manual doesn’t say anything about position source and the respective flag.
This needs to be tested.
This could become one of those threads 
Peter wrote:
Can the TRX display any uncertified ADS-B targets? I doubt it since these cannot be displayed on a certified display device. Yet most of the “lost cost ADS-B” activity is uncertified.
If it can display FLARM, why not uncertified ADS-B? FLARM is if anything even more uncertified.
OK; let me get this straight in my mind…
You can merge ADS-B IN and FLARM, using the TRX, into a certified display device.
You can merge ADS-B IN and active TAS, using various ways e.g. the Garmin TAS (or Avidyne once available), into a certified display device.
You can merge FLARM and active TAS with Mode S targets, into a certified display device.
What happens with FLARM and active TAS with non Mode S targets?
Can the TRX display any uncertified ADS-B targets? I doubt it since these cannot be displayed on a certified display device. Yet most of the “lost cost ADS-B” activity is uncertified.
No you cannot bring another system. There is no input for another system and the GNS can handle only one traffic system
Can you bring an active TAS into this system at all?
What is a “transponder warning”?
Yes, the FLARM unit has to be configured with the 24bit ID. The TRX1500A has a FLARM module integrated and no separate FLARM box.
I have checked the manual of the TRX1500A. It doesn’t do a merging. FLARM warnings have priority. Basically it will ignore all Transponder warnings, if there is a FLARM warning. Mode A and C are not used at all.
OK; learn something every day! So in a FLARM box you are supposed to config the same 24 bit ID as in your Mode S? Or does it pick it off your own Mode S TXP emission?
So Mode S + FLARM will be merged easily, but that still leaves Mode A/C + FLARM.
ADS-B out, Mode S and FLARM use the ICAO 24bit aircraft identifier. in FLARM it is the first field in the data packet. http://ediatec.ch/pdf/FTD-014-FLARM-Configuration-Specification.pdf local copy
Mode A and C obvious not.
Indeed, the TRX must be doing it, but I wonder how they do it. The FLARM data packet doesn’t AFAIK contain any piece of data which is common to the Mode S emission from the same target (and you could have Mode C – or even Mode A! – with FLARM so the transponder is not emitting anything useful). That leaves only the obvious method of merging targets in similar 3D (2D if the target is Mode A + FLARM) positions, but the azimuth on TAS is not all that accurate.
