Ifitaintbroke Posted Friday at 02:46 PM Share Posted Friday at 02:46 PM My CB radio is picking up interference from on of my gauges, creating a very annoying whistling sound anytime it is on, and the key is is the run position. The only gauge that could cause that, to my thinking, is the AFR. My plan is to add some rfi shielding material around the radio and coax. Link to comment Share on other sites More sharing options...
Gary Lewis Posted Friday at 02:56 PM Share Posted Friday at 02:56 PM You might try a capacitor from power to ground near the AFR meter. It might be feeding noise back into the electrical system. But a good CB radio should filter that out, so it may well be RF interference. Link to comment Share on other sites More sharing options...
Ifitaintbroke Posted Friday at 08:08 PM Author Share Posted Friday at 08:08 PM 5 hours ago, Gary Lewis said: You might try a capacitor from power to ground near the AFR meter. It might be feeding noise back into the electrical system. But a good CB radio should filter that out, so it may well be RF interference. I'm positive it's RF. The reason is because the radio didn't start doing this until I mounted it in the dash, and ran the coax close to the O² sensor wire. I have narrowed it down to that cable, as the noise stops when I unplug it. 1 Link to comment Share on other sites More sharing options...
grumpin Posted Friday at 09:39 PM Share Posted Friday at 09:39 PM Chasing noise in a CB radio is a pain! What brand and model radio? Some are really bad on noise. Link to comment Share on other sites More sharing options...
viven44 Posted Friday at 11:23 PM Share Posted Friday at 11:23 PM Just a dumb question... why couldn't this be RF interference from the voltage regulator or the coil ? I guess because the vehicle isn't running ? Link to comment Share on other sites More sharing options...
Ifitaintbroke Posted Saturday at 04:40 PM Author Share Posted Saturday at 04:40 PM 19 hours ago, grumpin said: Chasing noise in a CB radio is a pain! What brand and model radio? Some are really bad on noise. President McKinley II. 17 hours ago, viven44 said: Just a dumb question... why couldn't this be RF interference from the voltage regulator or the coil ? I guess because the vehicle isn't running ? Correct. Also, I no longer have a voltage regulator. Link to comment Share on other sites More sharing options...
ratdude747 Posted Saturday at 04:59 PM Share Posted Saturday at 04:59 PM Sounds like the issues I have/had on my ranger with HID ballasts that kept puking a bunch of noise on the 12V bus. Tried a lot of things (noise filters, better grounding, etc.) ended up buying better made ballasts that had better internal filtering. Still get a bunch of noise when the headlights are on but it's nowhere near as bad. Cheap electronics and CBs (or heck, FM radios even) don't mix... 1 Link to comment Share on other sites More sharing options...
Ifitaintbroke Posted Saturday at 05:53 PM Author Share Posted Saturday at 05:53 PM 53 minutes ago, ratdude747 said: Sounds like the issues I have/had on my ranger with HID ballasts that kept puking a bunch of noise on the 12V bus. Tried a lot of things (noise filters, better grounding, etc.) ended up buying better made ballasts that had better internal filtering. Still get a bunch of noise when the headlights are on but it's nowhere near as bad. Cheap electronics and CBs (or heck, FM radios even) don't mix... I'm going to try RFI shielding on the coax cable. It worked fine on my MSD unit. Link to comment Share on other sites More sharing options...
grumpin Posted Saturday at 11:26 PM Share Posted Saturday at 11:26 PM Quote President McKinley II. Wow! President radios have impressed me. Too bad you have noise. This is just my opinion but I don’t try too hard on an AM CB radio to get rid of noise. They pick up so much. I add squelch or tolerate it if I need to hear someone. 1 Link to comment Share on other sites More sharing options...
Ifitaintbroke Posted Monday at 02:52 PM Author Share Posted Monday at 02:52 PM I tried moving the coax and radio about 4 feet from the gauge and cable. Did not help one bit. I want to try rfi shielding, but not sure if I should put it on the O² sensor cable, or the radio's coax. It is also very expensive, at $7 a foot from McMaster Carr. Link to comment Share on other sites More sharing options...
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