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I have set up a 350 bridge and a 12 db omni antenna on a tug. There is a 13.5 db yagi on the roof of the port admin building at the bottom of the inlet. I get good copy out to about 15KM, when he is not behind a ship. Id think about something simila...
Any radio frequency noise coming from a motor generator set or power equipment is due to electrical arcing, which is not a good thing. In motors and generators there is some controlled arcing on the armature brushes. If they are worn out and not main...