Old king has trouble finding fabled artefact

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Possible Answers: GRAIL.

Last seen on: Mirror Cryptic Crossword October 4 2017

Random information on the term “GRAIL”:

The Ka band (“kay-ay band”) is a portion of the microwave part of the electromagnetic spectrum defined as frequencies in the range 26.5–40 gigahertz (GHz), i.e. wavelengths from slightly over one centimeter down to 7.5 millimeters. The band is called Ka, short for “K-above” because it is the upper part of the original NATO K band, which was split into three bands because of the presence of the atmospheric water vapor resonance peak at 22.24 GHz, (1.35 cm) which made the center unusable for long range transmission. The 30/20 GHz band is used in communications satellites, uplink in either the 27.5 GHz and 31 GHz bands, and high-resolution, close-range targeting radars aboard military airplanes. Some frequencies in this radio band are used for vehicle speed detection by law enforcement. The Kepler Mission uses this frequency range to downlink the scientific data collected by the space telescope.

The designation “Ka-band” is from Kurz-above, which stems from the German word “kurz” meaning short.

GRAIL on Wikipedia