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The center conductor of the coax is DC blocked, but not the shield.

On every radio I know about, the shield of the antenna connector is mounted on the chassis, and the chassis is connected to (-). So if the other side of the coax screws onto an antenna connector which is mounted on the vehicle chassis, then (-) DC current can flow thru this coax shield. If you disconnected the (-) black wire on the radio, and insulated the radio chassis from vehicle chassis, then all the radio's DC current would flow thru the coax shield. So to prevent ground loop, the (-) wire on the radio needs to be sized sufficiently so that current only flows thru that (-) and not the coax shield, or any other part of the vehicle chassis.

[QUOTE="dudmuck, post: 112835, member: 3904"] The [b]center[/b] conductor of the coax is DC blocked, but not the shield. On every radio I know about, the shield of the antenna connector is mounted on the chassis, and the chassis is connected to (-). So if the other side of the coax screws onto an antenna connector which is mounted on the vehicle chassis, then (-) DC current can flow thru this coax shield. If you [b]dis[/b]connected the (-) black wire on the radio, and insulated the radio chassis from vehicle chassis, then [b]all[/b] the radio's DC current would flow thru the coax shield. So to prevent ground loop, the (-) wire on the radio needs to be sized sufficiently so that current only flows thru that (-) and not the coax shield, or any other part of the vehicle chassis. [/QUOTE]

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