flps_74 wrote:
Hello all,

Our aircraft (Ms 893E) is wired with one VHF comm (old Narco 11A - but
functionning with noise mind you).

To get rid of the strobe noise, make sure that the TC200 and both COMs
are mounted very close to each other ( 10cm) and that the power/audio
grounds from these connect to one grounding screw to the airframe very
near the rear of the Com trays.

All distally mounted things like speakers, head-phone and mic jacks
should be locally isolated from the airframe, and separate ground wires
from these need to connect to the same grounding screw(s) as the Coms
and the TC200, thus defining a true "single-point-ground" for all audio
related devices. Remember that the COM trays force you put the
"single-point-ground" right on the tray mounting structure.