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Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) are two forms of interference that can interfere with communication signals. The most common sources of these disturbances are mechanical contact elements such as switches, contacts, fingerstock, and gaskets.

RFI is usually caused by an external electromagnetic disturbance. This disturbance may be generated by electric motors, atmospheric static electricity, radio transmitters, or electric power lines. This interference will cause a decrease in communication transmission quality. To prevent this, shields or filters must be used to prevent the disturbances from entering the system

EMI is usually caused by an internal source of electromagnetic radiation. This interference can be generated by charged particles or electric fields. This interference will also diminish the quality of communication transmission. To protect the system from this type of interference, shielding or filters can be used to prevent the radiation from entering the system.

Contacts are the most common method used to complete a circuit. This can be accomplished through a physical connection of two parts, such as two switches, or through a semi-conducting material such as carbon or silicone. These contacts can be used to provide an electrical circuit that is immune to RFI and EMI.

Fingerstock is a conductive material which is used to make a physical contact between two points. It is usually made from metal or a semi-conducting material. It can also be used to filter out RFI and EMI that travels through the physical contact point. Fingerstock is also used in electromagnetic shielding to protect a system from RFI and EMI.

Gaskets are a type of non-conductive material used to physically separate two points. These gaskets are usually made from rubber or plastic and are used to prevent electrical current from traveling between two points. They can also be used to filter out EMI and RFI that travels through the physical contact point.

In summary, RFI and EMI can cause interference with communication signals. The most common sources of this type of interference are mechanical contact elements such as switches, contacts, fingerstock, and gaskets. Using metal or semi-conductive materials such as fingerstock and gaskets, RFI and EMI can be filtered out and prevented from entering the system. By using these elements, a system can be protected from interference and provide a better quality of communication transmission.