How to Solve Dash Cam Interference with Car Radio?
2 Answers
To solve the issue of dash cam interference with car radio, the solution is to identify the path through which the interference propagates and either cut off this path or add additional interference suppression and isolation circuits. The diagnostic method involves using an oscilloscope to measure the voltage amplitude and ripple at the power supply terminal of the radio when it operates alone, recording the results. Then, power the dash cam and measure the radio's power supply again. By comparing the two measurements, you can determine if the interference is entering through the power supply and ground lines. Since the radio is a wireless RF circuit, it's possible that the dash cam, during its design, includes an antenna that continuously radiates in the corresponding frequency band. The dash cam records the entire journey, and in the event of an accident, it can help restore the facts and quickly determine liability.
I've been driving for decades and have encountered the issue of dash cams interfering with car radios several times. I didn't pay much attention before, but the radio always had static, which was particularly annoying when listening to traffic broadcasts. I found that the main solution is to avoid placing the interference source near the antenna—installing the dash cam at the bottom of the windshield, away from the rear window antenna position, helps reduce electromagnetic radiation. If that doesn't work, adding a power filter or replacing the power cable with one that has better shielding is quite effective. These small accessories aren't expensive to buy online. When I do it myself, I also check if the power grounding is good to ensure the dash cam operates stably. It's also best to clean the device's dust regularly to prevent interference buildup. In short, safety comes first—interference can cause you to miss important information, and not addressing it promptly could lead to problems. I recommend spending some time to fix it properly.
