Hi guys. Hope this post finds you well. Here's my problems, when the KHF950 is fitted to our Bell206L3/L4, it will start to retune typically 30 mins into flight. Ground functioning tests however are unable to duplicate the same fault. When this same set of KHF950 is fitted to Beech 200 or Bell412, it works perfectly find.
The antenna used in the L3/L4 is wire type, about 22' long & grounded at the tail boom. Antenna feed-thro' has been changed countless times as well.
Please assist.... this thing has been bugging me for years =.='
Thxs