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Radio Noise

Radio noise and other annoying buzzes are many times transmitted through an AM radio. Here is a check-off list of the most likely causes:

Dimmer switch
Neighbors dimmer switch
Fluorescent light
Computer
Touch lamp (even when turned off)
Automatic on/off night lights.
Automatic outdoor yard lights
Electronic bug and pest controllers
Light bulb that is about to burn out
Faulty electrical switch
Nearby television set
Neighbor using fluorescent lights
Christmas tree lights & other blinking bulbs
Neighbors dimmer switch (apt. complex)
Scanners
Cell phone chargers
Dirty insulators on nearby power pole
Electric blanket
120V AC smoke detectors (battery operated OK)
Ionic Breeze or other electrostatic air purifier
Ultrasonic motion detectors
Appliances with motors

Note: Sometimes pool chlorine generates electrolytic action which causes radio noise over a wide spectrum of over 500' from the device. Unfortunately there is no known cure.

The best way to eliminate radio noise and interference is at its source. Here is a check-off list of possible solutions:

The most obvious solution is to turn off the offending device.
Temporarily switch the radio from AC power to battery power to see if the interference is coming from the electrical outlet. If the noise stops, our Radio Noise Filter/Surge Protector will dramatically reduce the interference.
Turn off all circuit breakers to see if the noise stops. If it does then you know it is something in your house. Turn off one circuit at a time to isolate what area the noise is coming from.
Use a battery operated radio as a direction finder. Turn the radio until the loudest noise is heard. The front and back of the radio will usually point to the noise origin.
Carry a radio around the neighborhood. Ask other neighbors if they have problems (with radio noise).
If a power pole is suspected, call the utility company and they will usually check the area and wash the insulators.
Often grounding a radio will reduce hum caused from AC line noise. Unfortunately most receivers do not have a ground connection.
For more in-depth information about tracking down and solving interference, please read Interference: Define and Conquer by Tom Osenkowsky at Radio World.
Still have a question about radio noise or radio reception problems? Visit our FREE Online Library or call one of our technicians at (707) 725-9000

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C. Crane Company, Inc.
1001 Main Street
Fortuna, CA 95540
(800) 522-8863