Radio frequency device utilizing EMI-blocking coating at connections with external leads

A cable television junction box assembly, comprising a junction box to which are joined an input signal cable and plural output signal cables, and latently susceptible at the junction of the cables and the junction box to adverse operating effects selected from one or more of electromagnetic interference, signal loss, signal attenuation, and radio frequency leakge,

• wherein the improvment comprises at the junction of at least one cable and the junction box, a layer of a material which is blockingly effective against the adverse operating effects, the material having a volumetric resistivity of from about 10.sup.-3 to about 2,000 ohm-centimeters.

In a method of assembling a radio frequency device comprising joining a signal processing means to electromagnetic transmission means, wherein the resulting device is latently susceptible at the junction of the signal processing means and the electromagnetic transmission means, to adverse operating effects selected from one or more of electromagnetic interferences, signal loss, signal attenuation, and radio frequency leakage,

• the improvement comprising providing, at the junction of the signal processing means and the electromagnetic transmission means, a layer of a material which is blockingly effective against the adverse operating effects, the material having a volumetric resistivity of from about 10.sup.-3 to about 2,000 ohm-centimeters.

In a method of assembling a cable television junction box assembly, comprising joining an input signal cable and plural output signal cables to a junction box, wherein the resulting junction box assembly is latently susceptible, at the junctions of the cables and the junction box, to adverse operating effects selected from one or more of electromagnetic interference, signal loss, signal attenuation, and radio frequency leakage,

• the improvement comprising providing, at the junction of at least one cable and the junction box, a layer of a material which is blockingly effective against the adverse operating effects, the material having a volumetric resistivity of from about 10.sup.-3 to about 2,000 ohm-centimeters.