Man-made interference is emanated from most any location where electrical appliances are being used.
However, the worst causes of interference are caused by neon signs, fluorescent lights,
arc welders, faulty televisions, motors and engines, and faulty power-line transformers.
If you can choose the location for your radio installation, you are much better off setting
up in a rural area--chances are that there will be a relatively small amount of man-made
interference. For base-station operation, you should not operate fluorescent lights.
Otherwise, there is little that you can do to persuade local businesses to remove their
neon advertising signs or change back to incandescent lighting.
For mobile operations, you are stuck in a noisy environment. The ignition system, engine, alternator, electrical
system, and wheels all produce electrical noise. Severe noise from the ignition system is caused by the sparks of
electricity at the spark plugs. If you have a diesel car or truck, which has no spark plugs, you are spared from this
noise. But the engine and alternator both produce noise from the cycling metal (the pumping cylinders in the engine
and the spinning coil of wire in the alternator). Electrical signals from passing wires (such as for the turn signals,
etc.) can sometimes interfere with a nearby HF radio. The last form of vehicular HF interference occurs when
driving; the tires roll on the pavement (both nonconductors) at high speeds and build up static electricity.
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The SGC Building, 13737 S.E. 26th St. Bellevue, Washington 98005 USA
P.O. Box 3526, 98009 Tel: (425) 746-6310 Fax: (425) 746-6384
© 1997 SGC Inc.
MAN-MADE INTERFERENCE
Man-made interference:
neon signs, fluorescent
lights, faulty
televisions, electric
motors, engines, faulty
power line
transformers, etc.
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