Genuine Motorola Die-Cast Metal Chassis Base Plate
The Motorola 6405847N03 is a precision die-cast metal base plate designed to serve as the structural foundation and electromagnetic shielding chassis for Motorola two-way radio equipment. This engineered component features a bright protective finish (likely zinc plating or similar coating) that provides corrosion resistance while maintaining excellent electrical conductivity for EMI shielding. The base plate includes multiple mounting bosses, alignment features, and component cutouts that facilitate proper assembly of circuit boards, displays, controls, and other radio components. The die-cast construction ensures dimensional stability, mechanical strength, and effective heat dissipation for reliable radio operation.
Key Features
- Genuine Motorola OEM base plate ensures proper fit and precise alignment with all radio components
- Die-cast metal construction (zinc or aluminum alloy) provides excellent mechanical strength and rigidity
- Bright protective finish offers corrosion resistance and maintains electrical conductivity for EMI shielding
- Large central rectangular cutout accommodates display modules or main component mounting
- Multiple threaded mounting bosses and standoffs enable secure PCB and component attachment
- Precision-machined surfaces ensure proper alignment and assembly tolerances throughout the radio
- Integrated ribbed reinforcement structure on underside enhances mechanical stability and heat dissipation
- Various component cutouts provide clearance for switches, connectors, and control elements
Technical Specifications
- Component Type: Die-Cast Metal Base Plate / Chassis Frame
- Material: Die-cast zinc alloy or aluminum alloy
- Finish: Bright metallic protective coating (zinc plating or similar)
- Part Marking: 384-N-03B (stamped into metal)
- Construction: Precision die-cast with machined mounting surfaces
- Features: Multiple mounting bosses, alignment pins, component cutouts
- Function: Structural support, component mounting, EMI shielding
Applications
- Structural chassis frame for Motorola portable or mobile radio assemblies
- Electromagnetic interference shielding enclosure
- Circuit board and component mounting platform
- Heat sink for power components and RF circuitry
What's Included
- One (1) Motorola 6405847N03 Die-Cast Metal Base Plate
Application and Installation Notes
This die-cast base plate serves as the foundational structural element in Motorola radio construction, providing multiple critical functions simultaneously. The metal chassis acts as a rigid mounting platform that maintains precise alignment between circuit boards, the display assembly, control switches, and connector interfaces. The conductive metal surface provides an effective electromagnetic interference shield that prevents RF energy from escaping the radio housing and protects sensitive receiver circuits from external interference. The thermal mass of the die-cast metal also functions as a heat sink, conducting heat away from power amplifier components, voltage regulators, and other heat-generating elements to prevent thermal damage and ensure reliable operation.
Installation requires careful handling and proper assembly procedures that should only be performed by qualified radio technicians. The base plate typically mounts to the radio housing using screws through the circular mounting bosses visible around the perimeter. Circuit boards attach to the integrated standoffs using small screws, with the base plate providing both mechanical support and electrical grounding. When installing circuit boards, ensure all grounding points make solid electrical contact with the metal base plate, as proper grounding is essential for EMI shielding effectiveness and radio performance. Apply appropriate torque to mounting screws to prevent over-tightening that could strip threads in the die-cast material or crack circuit boards.
The protective finish on this base plate serves dual purposes of corrosion protection and electrical conductivity. Over time or in harsh environments, the finish may show signs of oxidation or wear at high-contact areas. During radio service, inspect the base plate for signs of corrosion, mechanical damage, or mounting boss thread damage. Clean any oxidation from grounding contact areas using fine abrasive or contact cleaner to ensure proper electrical connection. If mounting threads become stripped or damaged, the base plate must be replaced, as proper mechanical retention and electrical grounding of circuit boards are critical for reliable radio operation and regulatory compliance.
This component should be replaced during major radio repair or refurbishment when the original base plate shows damage, corrosion, stripped mounting threads, or when proper EMI shielding performance cannot be verified. Always use genuine Motorola replacement parts to ensure proper fit, material specifications, and electromagnetic compatibility. Improper base plate installation or use of non-OEM substitutes can result in EMI issues, mechanical misalignment, inadequate heat dissipation, or failure to meet regulatory requirements for spurious emissions.
Ideal for authorized Motorola service centers, professional radio repair technicians, and communications equipment refurbishment facilities performing complete radio rebuilds or major component-level repairs on Motorola two-way radio equipment.
Manufacturer Part Number: 6405847N03
Stamped Marking: 384-N-03B
Description: PLT Base Fin.
