Curing Neon Sign Interference

Radio Record, Volume IX, Issue 2, 19 July 1935, Page 57

Curing Neon Sign Interference

Noise from neon signs may have any one of several causes. If the sign is of the flashing or on-off variety, sparking at the contacts of the switch which accomplishes this flashing action may produce intermittent noise. A steady buzz is usually caused by what is known as "flicker voltage." If the transformer which operates the sign is overloaded a radio frequency voltage will be generated by the windings. Loose connections between transformer and the neon tubes themselves, or between separate sections of tubing, are also commonly found. A by-pass condenser usually cures arcing switch interference. Overloaded transformers may be replaced with new and larger units. The transformer casing, and the metal sheath of any connecting wires should be thoroughly grounded. It is a good idea to point out to users of such signs the fact that they are operating inefficiently and expensively if they cause radio noise.