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Workman Nf-40 CB Radio Stereo Power Noise Filter 240w Rms...
Price:
$14.70
Returns:
30 days returns. Buyer pays for return shipping.
Condition:
Workman NF40 20 Amp Noise Filter.
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Does the job for a medium cost unit. After reverse engineering both the NF20 & NF40 models, I found both of "fairly" good design with the only difference being the NF40 has more filtering capacity on the second stage. Both used the same wire gauges and coil values. The first stage for High Frequency noises and uses a air core coil and .01uF capacitor. The NF40 second stage is for Low Frequency noises and uses a iron core coil and (2) 16V 5600uF capacitors. The NF20 uses (1) 16V 6800uF capacitor. Would have given a higher rating if the capacitors were rated @ 25V instead 16V and a little larger wire lead gauge. Voltage drop is approx 0.5V @ 10A, which is acceptable for most installs.Both models have better filtering capacity than the Install Bay brand. Install Bay may have a little less voltage drop. With the Bandit/Workman being a little better, both brands are of fairly good consumer quality, but both fall short of commercial grade construction and materials. On one of my NF20 units, I found the Input & Output were labeled backwards. The colors were correct, just the wires were pushed through the wrong sides during assembly. I pulled the wires back out of the housing and reinserted them correctly, If your unit has little to no affect on alternator whine type noises, try reversing the Input & Output. Never reverse the polarity of the Red & Black wires. If you open it up to verify correct assembly, the Input side Red wire should go to the little air core coil first. Read full review
Verified purchase: Yes | Condition: New
Unless you run your CB straight to the battery this noise filter should be standard on your setup. Took me 10 mins start to finish to add this to my Galaxy 47hp and immediately dropped my baseline RF from 1.5 to .2, and could hear more clear conversations from further away that normally would have been hidden by the static.
Verified purchase: Yes | Condition: New
The unit works fine. I would have liked to have had heavier wire to handle the 240W capability. I shortened them and used heavier wire
Verified purchase: Yes | Condition: New
It's made of good quality but it didn't fix my problem
Verified purchase: Yes | Condition: New
Hooked it up the way instructions say to. There is no change in noise none!
Verified purchase: Yes | Condition: New
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