On Oct 29, 3:25*am, Andrzej Kobus wrote:

I would not think PowerFlarm would special order anything if it was
not required. Why would they change the antenna later, maybe because
of poor PCAS performance? If PCAS estimates distance through signal
strength (as I was told) then how would they be able to calculate the
strength with two different antennas?

There is provision in the ADS-B module interface for calibrating for
different antenna performance. However, I have no way of knowing if
units delivered with the later antenna are calibrated differently.
( See TRX-1090 Data Port Specification)

Andy GY