WORKMAN CBNF3AXX CB Radio Power Noise Filter - Stops Auto Interference

Our review of the WORKMAN CBNF3AXX finds it is a straightforward accessory for anyone battling hiss, alternator whine or intermittent noise on vehicle radio power feeds. The core reason to buy is simple: it isolates and filters noise at the power source so a CB or mobile radio delivers clearer receive audio and more reliable transmit performance. This review focuses on installation practicality, wiring quality, and real-world noise reduction for common mobile radios that use a 3 pin plug.

Key Features

• Noise suppression: The inline 20 amp noise filter reduces electrical interference from alternators and other vehicle systems so radio audio is cleaner and easier to understand.
• 3 pin compatibility: The included 3 pin plug fits Uniden, Cobra, Galaxy and many other CB and mobile radios for quick connection without cutting factory plugs.
• Heavy gauge wiring: The 12 gauge, 6 ft lead provides a durable, low-resistance power run that helps maintain stable voltage to the radio over distance.
• Dual fuse protection: Two fuse holders on positive and ground add an extra layer of circuit protection and make troubleshooting fuses easier.
• Vehicle-ready design: Built specifically for auto power source feeds so it can be tucked into engine bays or under dash panels during installation.

Who It's For

The WORKMAN CBNF3AXX is aimed at drivers and installers who use mobile CB or stereo radios and need a reliable, plug-in way to eliminate power-related noise without extensive rewiring. It suits owners of Uniden, Cobra, Galaxy and similar radios that accept a 3 pin power connector and anyone who prefers a wired, fused inline solution over quick fixes like ferrite clamps.

It is not intended for users who need a complete audio system overhaul, advanced RFI mitigation for commercial fleets, or radios that do not accept the 3 pin power plug. If a vehicle requires custom harness fabrication or additional shielding, a different installation approach may be better.

Pros & Cons

Pros

• Effective reduction of common vehicle power noise, improving receive audio clarity on CB and mobile radios.
• Convenient 3 pin plug works with many popular radio brands for fast installation.
• Sturdy 12 gauge, 6 ft wire run reduces voltage drop and allows flexible mounting locations.
• Two fuse holders provide added circuit protection and simple fuse access.

Cons

• Limited to radios that use the 3 pin connector and to installations where an inline filter is sufficient to stop interference.
• The unit is a single-purpose filter and does not replace comprehensive shielding or grounding work needed for complex installations.

Specifications

Model	CBNF3AXX
Filter rating	20 Amp Noise Filter
Connector	3 pin plug for Uniden, Cobra, Galaxy and similar radios
Wire gauge	12 Gauge
Wire length	6 ft
Fuse holders	Two holders on positive and ground

Our Verdict

The WORKMAN CBNF3AXX is a practical, value-minded noise filter for mobile radio users who want a fast, durable fix for power-related interference. Installers and vehicle owners with compatible 3 pin radios will appreciate the heavy 12 gauge wiring and dual fuse holders, and most will see a noticeable improvement in audio clarity without complex modifications.

Frequently Asked Questions

Will this fit my CB or mobile radio?
It fits radios that accept the 3 pin power plug, such as many Uniden, Cobra and Galaxy models; verify your radio uses a 3 pin connector before buying.

Can this unit be mounted under the dash or in the engine bay?
Yes, the 6 ft 12 gauge lead allows flexible placement under dash panels or in engine bays, but avoid direct exposure to high heat or moving parts.

Do I still need additional grounding or shielding?
In most common noise cases this filter is sufficient, but complex RFI problems may require additional grounding or shielding work beyond the inline filter.