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In this case, more capacitance is not what you need.
You need capacitors of the low-inductance type, like metal film.
You are trying to prevent an RF signal from coming down the DC line.

What can also help is routing the wires from the battery to radio as far from the engine as possible. If you run those dc lines nearby ignition wires, then your asking for it. Also some twisting the red and back together can reduce noise pickup.

[QUOTE="dudmuck, post: 124363, member: 3904"] In this case, more capacitance is not what you need. You need capacitors of the low-inductance type, like metal film. You are trying to prevent an RF signal from coming down the DC line. What can also help is routing the wires from the battery to radio as far from the engine as possible. If you run those dc lines nearby ignition wires, then your asking for it. Also some twisting the red and back together can reduce noise pickup. [/QUOTE]

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