Page "Viking program" Paragraph 9

An acquisition Sun sensor, a cruise Sun sensor, a Canopus star tracker and an inertial reference unit consisting of six gyroscopes allowed three-axis stabilization.

Two accelerometers were also on board.

Communications were accomplished through a S-band ( 2. 3 GHz ) transmitter and two TWTAs.

An X band downlink was also added specifically for radio science and to conduct communications experiments.

Uplink was via S band A two-axis steerable high-gain parabolic dish antenna with a diameter of approximately 1. 5 m was attached at one edge of the orbiter base, and a fixed low-gain antenna extended from the top of the bus.

Two tape recorders were each capable of storing 1280 megabits.

A 381-MHz relay radio was also available.