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Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor

Telephone EMI, questions and answers on how to solve interference problems to phone lines

comprehensive line of products for rejection of Radio Frequency Interference (RFI) to telephone equipment.