[n86121]

The uavionics stuff I THINK is adsB over UAT, aka 978 Mhz only, which is only a USA thing and upfeeds weather too. I don't know if there is any ADSB WX up in Canada.

But that is all invisible to radar interrogators and airliner TCAS etc, that all work on 1090Mhz.

I THINK you still need some form of output on 1090 MHz, 327 or other transponder, to generate the reply to radar interrogation, code and altitude on 1090Mhz.

The only way to replace the two transponder boxes 978Mhz (UAT) and 1090Mhz (Mode C), is one Mode S extended squitter 'ES' ADS transponder, that puts out target vector info over 1090Mhz, the international standard.

I THINK navcanada ADSB relies on Aiereon from above, which is looking for 1090MHz Mode S ES, with an antenna on top. Would need to confirm, but pretty sure.

They originally thought it could pickup signals from the horizon, but then I saw something about 'whoops,' we meant antennas on top'

Think of this mish mash as 'your tax dollars at work'