98-175666-A Appendix E: Grounding and RF protection E-8
Grounding Recommendations
Isolation of the ADU from the mounting base
In cases where the ADU is to be isolated from the mounting base, shoulder bushings and
washers (accessories) must be used as illustrated below. Please note that the isolation has to
be implemented on all four mounting bolts (including the bolt securing the ground cable).
The ground cable must be connected at one of the mounting/grounding bolts on the ADU
as illustrated below. Remember to seal the joint with protective coating to avoid corrosion.
Figure E-7: Isolation of the ADU from the mounting base
Isolating shoulder bush
Isolating washer
Plain washer
Spring washer
(stainless steel)
(stainless steel)
Figure E-8: ADU isolation and grounding cable
Isolating shoulder bush
Plain washer (stainless steel)
Spring washer (stainless steel)
Plain washer (stainless steel)
Serrated washer (stainless steel)
Ground cable
Ground cable
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