A metallic microwave conductor, typically rectangular in shape, used to carry microwave signals into and out of microwave antennas.
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.
WKU - Working Key Units.
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