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"OldSailor" wrote: Our AM/FM radio has severe noise when tuned on the AM band. We have lived with this, because we mostly listen to FM, but these seem more directional than the AM stations, so keep fading in & out when at anchor. Today, I did a test to find the source of the noise. I had suspected it was the battery charger but this turned out to be wrong. What it is, is a small computer fan that we use to ventilate the cupboard where the refrig compressor is located. Turn fan off and noise is gone! The fan is new and is a typical 3" computer fan except it has two speeds controlled by temperature. The refrig unit itself has two fans - a 4" and a 2" and these do not seem to cause any noise. I suppose I can change the fan, but is there another way to eliminate the radio interference? Well, now, if you really want to eliminate the noise you can do one of three things. 1. Buy a different fan that doesn't make noise in the MF Radio Spectrum. They do make them..... 2. See if you can supress the noise coming out of the current fan, with the appropriarte Ferrite Beads, and ByPass Capacitors, or get one of the fancy NUMAR or Ormicon Noise Filters for the DC wires feeding the fan. (wires most likely are acting like an antenna) 3. Get ride of the fan altogether.....or maybe just turn it off while your listening to the radio. Bruce in alaska one with years of experience, in noise supression, on Maritime Mobile Stations..... -- add a 2 before @ |
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