[quote=“SteveKane, post:2196, topic:548884”]
Note that I I sometimes see inaccurate information in the KNS-80, i.e. the calculated airspeed is half or 25% of what it should be.
[/quote
were you flying with sim rate x2 ? 
, about the fluttering, was it similar to this ?
https://forums.flightsimulator.com/t/a310-adf-needles-unstable/580477
another user, report this in the past, seems to be a very old bug ADF Bearing Indications
I guess it s issues we will have to deal with, I hope 2024 will improve all those glitch … maybe it’s due to all recent avionics changes, and WT gns530, I m wondering if it could be worth give a try with the older gns 530 version (non WTT)