♦ Silicon epitaxial planar capacitance diodes with very wide effective capacitance variation for tuning the whole range of UHF television bands. are used for direct satellite receivers. .012 (0.3) .106 (2.7) .091 (2.3) .079 (2.0) .063 (1.6) Cathode Mark ♦ Two BB721/BB721S tuner diodes in series .