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Nightime Lights and Radio Noise

Old 02-20-2008, 05:36 PM
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Default Nightime Lights and Radio Noise

Hope someone can point me in the right direction.

During the day, the AM/FM stereo on the boat is sounding good, but when I turn on the Nav or Anchor lights, the signal is terrible. Lots of noise. It's almost like the antenna is disconnected as soon as the lights go on. Turn the lights off and the sound signal is great. This problem is NOT evident when playing a CD or ipod - those work fine - day or night.

Lights are all LED - is there some kind of filter needed?

The power for the lights comes from a buss bar/circuit breaker and switch on my main helm panel, but the stereo is on a totally separate circuit that is hard-wired to a fuse and battery (so I can listen even with the 1-2-all-off switch is turned off).

Any ideas - other than the ipod? ;?
Old 02-20-2008, 07:36 PM
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Default Re: Nightime Lights and Radio Noise

Do the LED lights run off the same battery? If so, then use a separate battery for the lights and sterio--be sure that they are not connected at any point, other than the common negitive. I would try putting a ferrite bead on the power supply and the antenna of the radio. Also route the wiring of the antenna, power leads and speakers away from the LED's and the wiring leading to the LED's. Also what type of antenna are you using on the sterio? Get a good quality marine antenna if you are just using a tuned piece of wire.
Old 02-20-2008, 09:19 PM
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Default Re: Nightime Lights and Radio Noise

Check whether it comes from the power cords (use a battery) or the antenna. If Antenna, except finding and blocking the source, not much to do.

If from power cords, you can easy make a filter yourself. Check on my photobucket signature, there is sketch and picture there among the mess. You need 2 capacitors (nber 103 about), and 2 ferrite cores to roll the power cords around. It blocks VERY well cord noise, and you will not need a separate battery. It should not cost more than a couples of USD. Place it as close as possible to the radio.
Old 02-21-2008, 05:28 PM
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Default Re: Nightime Lights and Radio Noise

Sorry, it was not there anymore, but now added.
You make max turns around the ferrite. It is not a clipping one, and diameter is about 2-5 times the width (or height of cylinder). But the clipping might work as well.

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