Dave,
Very good question. I’m no expert but here is my understanding and my solution.
Since you do not have an RF ground, you can get by with grounding the shield
wire to the battery ground. In principle, you should not use the same negative
wire as used for supplying power. The reason is t
Dave — tie the shield to the negative power wire at the power supply lead to
the plotter. I’m sure there’s no RF grounding system on most of our boats; you
start seeing it on larger vessels or those with SSB installations.
— Fred
Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) --
