Thanks for all the replies
On the last flight I tried my spare adaptor, no change. Moving about the flight deck with the headset didn't cause any change in the interference.
EEngr:
I have had a play with the dip switches to no avail and also tried the ferrite core with the double coil and all sorts of ways, no joy.
I'll try sniff out a guy with an ohmmeter and find a new battery. The issue only arose when I connected to the A380.
Airbus engineer for advice... haha... haha... These guys don't even get back to the owners of the 380s in a timely manner!!!
BARKINGMAD:
I have already tried switching off the windshield heat, no effect. Thanks for the suggestion.
BTW, the 380 has unique generators as they are variable frequency, could this play a part?
Thanks for all the suggestions.