There is a mains supply producing 24v too which can be used when there is no helicopter power and is selected by a switch this has a ground cable to the box chasis. Also the 24-12 stepdown has a chassis ground as follows
110V-240V AC----->ACtoDC 24volt transformer(grounded) ---->power to camera + feed to 24VDC-12VDC stepdown transformer(grounded) for monitors and VTR etc.
or by switch
24V DC in from chopper -----> power to camera + feed to 24-12 stepdown transforner(grounded) for monitors and VTRetc
What are the issues with these ground connections and the bridge?
Many Thanks