Dakota 4WD V8-4.7L Flex Fuel (2008)
Radio/Stereo Noise Filter: Description and Operation
Operation
OPERATION
There are two common strategies that can be used to suppress Radio Frequency Interference (RFI) and ElectroMagnetic Interference (EMI) radio noise.
The first suppression strategy involves preventing the production of RFI and EMI electromagnetic signals at their sources. The second suppression
strategy involves preventing the reception of RFI and EMI electromagnetic signals by the audio system components.
The use of braided ground straps in key locations is part of the RFI and EMI prevention strategy. These ground straps ensure adequate ground paths,
particularly for high current components such as many of those found in the starting, charging, ignition, engine control and transmission control systems.
An insufficient ground path for any of these high current components may result in radio noise caused by induced voltages created as the high current
seeks alternative ground paths through components or circuits intended for use by, or in close proximity to the audio system components or circuits.
Preventing the reception of RFI and EMI is accomplished by ensuring that the audio system components are correctly installed in the vehicle. Loose,
corroded or improperly soldered wire harness connections, improperly routed wiring and inadequate audio system component grounding can all
contribute to the reception of RFI and EMI. A properly grounded antenna body and radio chassis, as well as a shielded antenna coaxial cable with clean
and tight connections will each help reduce the potential for reception of RFI and EMI.
