Sat Jun 05, 2021 12:01 pm #1851304
Cub wrote:PaulSS wrote:@Flyin'Dutch'Flyin'Dutch' wrote:Did they not have their TXPDR on for you to see them on your PAW with multilateralisation?
As I said, I didn’t get THAT close. I couldn’t see whether he had his transponder on or not and if he did I have no idea if he had C Mode S or just just Mode C.
Yet you are confident that he was using a SkyEcho that wasn’t performing?
It was emitting CAP1391
I have taken a look at the data, and it does not appear to perform that well I'm afraid
And that is when attempting to detect using something like a 4ft long 9db antenna from multiple locations !!
Another interesting fact, the aircraft in question was indeed being multilaterated and perfectly well I should add.
So here is the fly in the ointment, when the GRID network considers an aircraft for rebroadcast, it uses the following logic.
Does the aircraft (using a common ICAO) have an emitter type that can be seen directly by a PilotAware, in this case the logic says it is emitting
As the aircraft is emitting CAP1391 and this is detected by multiple hi-gain antennas, then it is NOT considered for re-broadcast, now this is pretty unfortunate, because this means we will not uplink the multilaterated position from the ATOM/GRID network, which Paul would easily have seen from either Selsey, EGHJ, EGHN, Lasham, or IOWPara
We have debated internally this potential problem, we may have to rethink whether we should re-broadcast CAP1391 devices, as this situation clearly shows there is once again a problem.