A metallic microwave conductor, typically rectangular in shape, used to carry microwave signals into and out of microwave antennas.

Working Key

A low level key that changes several times per second, also called the 'control word'. Typically this key changes every 4 video display frame times (133.5 msec for 525 line systems, or 160 msec for 625 line systems). The working key is used to derive keystream. For services without a video component, the working key epoch duration can be set to an appropriate interval.

WKE - Working Key Epoch.

WKP - Working Key Period.