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Viking Lander Communications Antennas

NASA's Viking mission landed two spacecraft on Mars in 1976, Viking landers 1 and 2. This video describes the lander's three communications antennas: a UHF transmit-only antenna, an S-Band receive-only Low Gain Antenna (LGA), and an S-Band transmit-and-receive High Gain Antenna (HGA). https://en.wikipedia.org/wiki/Viking_... The video explains the antenna hardware using a high-fidelity 3D digital model of the Viking lander that is a work-in-progress hobby of mine. Some renderings of the model components, still under construction: https://goo.gl/photos/bcdFG1M2YMwQqyfq9 The model itself (created with SketchUp) is freely available: http://tinyurl.com/viking3dmodel Most of the animations were created using a beta version of Fredo6's SketchUp extension "Animator". Sequences showing the HGA parabolic dish reflecting radio "beams", and the HGA deployment mechanism in action (constant-force laminated springs and rate-limiting anchor-recoil governor) were created with custom-written SketchUp plugins by the author. My thanks to the following organizations who have allowed me to research their Viking artifacts: The Viking Mars Missions Education and Preservation Project https://vikingpreservationproject.org The Museum of Flight http://www.museumofflight.org California Science Center https://californiasciencecenter.org Virginia Air and Space Center http://www.vasc.org NASA Langley Research Center https://www.nasa.gov/langley Smithsonian National Air and Space Museum https://airandspace.si.edu The Viking research photographs and measurements I've captured (plus some historic information I've collected) are available in the following albums: Flight Capsule 3 in Seattle Museum of Flight (756 photos): https://goo.gl/photos/hedHCChRTyAbsN7W9 Dimensioned diagrams of the FC3 lander: https://goo.gl/photos/bp6qyitviWuS55VCA Proof Test Capsule Lander at Smithsonian NASM (466 photos): https://goo.gl/photos/DPPq6cci1dNQJRVP9 PTC Lander at Smithsonian NASM in 2016 (888 photos): https://goo.gl/photos/nwr4Mt2CAaHYJraw9 Lander at Virginia Air and Space Center (622 photos): https://goo.gl/photos/kk3cojepePDNo3yg6 Dimensioned diagrams of the VASC’s lander: https://goo.gl/photos/fPBQcWmbmo8gbwzt8 Lander at California Science Center (456 photos): https://goo.gl/photos/zEF5GqU7D8WZWSVGA Dimensioned diagrams of the CSC's lander: https://goo.gl/photos/7HoHmLFPzzL3eYee8 Misc diagrams, unusual photos (over 350 images): https://goo.gl/photos/FDcpciijf1HSjj2G7 Body assembly blueprints: https://goo.gl/photos/sczxRikkwJ2DB83j8 Collector Head Shroud Unit at NASA LaRC (99 photos): https://goo.gl/photos/pPY6yjAum8BBYxjR7 Biology instrument at Cleveland Museum of Natural History (36 photos): https://goo.gl/photos/JyKWiSegW9rVDAcL8 XRFS Instrument (42 images): https://goo.gl/photos/CGCyfMukJZde3MxQ8