Thread: RFI Nois
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Old 03-17-2011, 10:50 AM   #22
C lectric
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City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,414
RE: RFI Nois

The older Norcold have a two transistor inverter, relay and a multistep transformer to run from either AC or DC. I have one but it does not , that I'm aware of, cause any noise detectable by my VHF.
My VHF though has its own power supply from one battery set, the fridge has its own power supply from a different battery set and the wiring run is separated to a good degree.
That may be part of the reason I don't have a noise problem from the fridge.
Take a look at the wiring and if they are fed from the same terminal strip somewhere try separating them , including the ground side, even temporarily as a test.

These old fridges can be tuned up a bit. Do you run it on AC periodically? Try plugging it onto AC when it is running on DC. If you hear a change in the motor noise, such as a speed up, then there is a adjustable resistor that needs to be twiddled to get the frequency up again. Be carefull. If the frequency has fallen off it may increase the noise or the ability to hear it. The freq. fall off will also affect the cooling of the fridge and not for the good.
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