Embodiments of the present disclosure provide techniques and configurations for a cable assembly for single wire communications (SWC). In one instance, the cable assembly may comprise a wire having a wire end to couple with a signal launcher of an electronic device, and a first cover portion to house a first portion of the wire that extends from the wire end. The first cover portion may comprise a shape to conform to a shape of the signal launcher, and may be fabricated of a material with a dielectric constant above a threshold. The assembly may further comprise a second cover portion coupled with the first cover portion to house a second portion of the wire that extends from the first wire portion and protrudes from the first cover portion. The second cover portion may be fabricated of a ferrite material. Other embodiments may be described and/or claimed.