Finally there is hope!! This LED Light bar I ordered off of Amazon, puts out a lot of light and is awesome, however, it also makes it nearly impossible to tall on the CB radio while also running the light bar. The amount of RFI (Radio Frequency Interference) this thing puts out is horrendous to say the least!

What I have figured out, finally, is not just how the RFI is being transmitted by the LED Light Bar and how it is being received by the CB Radio, but also how to deall with the problem. This video demonstrates the problem and the effectiveness of the noise filter at filtering out the noise being transmitted as RFI.

A brief description on the nature of the problem:
The light bar has two built in switch mode power suppies that are poorly designed and generated all kinds of noise interference "hash" that spreads across the spectrum. That "hash" is back feeding onto the power wires that power the light bar. The power wires are then acting like a big antenna that are then radiating that "hash" in the form of radio waves, generating the RFI. My CB radio antenna, along with any other nearby radio antenna, is picking up the RFI, causing a very strong static signal that drowns out just about anyone I would otherwise be able to hear just fine.

The solution:
A Low Pass Noise Filter (LPF) is placed as close to the source of the noise contamination as possible. In this case the light bar. The LPF, blocks all of the high frequency currents causing the RFI and only alows the low frequency currents or DC currents to pass through. By placing the LPF as close to the source of the unwanted noise as possible, the least amount of wire will potentially act as an antenna before reaching the LPO.
The low pass filter has an input side and an output side. The side of the circuit where the noise is being generated from should be on the input side of the LPF and the other side of the circuit that the noise needs to stay out of should be on the output side of the LPF.

свернуть