pulling at the old grey matter!!!
Static noise can be produced by the build up of static on the fuslage in flight, dischargeing into the airflow. Reduced by static wicks that have a finite ohmic value, which allow the charge to bleed off the aircraft skin with out sparks (even small static sparks cause radio interference).
HIRF is lightning and reqires good bonding to allow the charge to run to the extremities, so that again the dischargers again can bleed the enduced charge off the aircraft. HIRF covers a large bandwith.
HOME PROJECT!
short out a 9V battery near a radio then by a tV
[ 23 August 2001: Message edited by: The hippy ]