Page "Mariner 4" Paragraph 12
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The telecommunications equipment on Mariner 4 consisted of dual S-band transmitters ( with either a seven-watt triode cavity amplifier or a ten watt traveling-wave tube amplifier ) and a single radio receiver which together could send and receive data via the low-and high-gain antennas at 8⅓ or 33⅓ bits per second.
Data could also be stored onto a magnetic tape recorder with a capacity of 5. 24 million bits for later transmission.
All electronic operations were controlled by a command subsystem which could process any of 29 direct command words or three quantitative word commands for mid-course maneuvers.
The central computer and sequencer operated stored time-sequence commands using a 38. 4 kHz synchronization frequency as a time reference.
Temperature control was achieved through the use of adjustable louvers mounted on six of the electronics assemblies, plus multilayer insulating blankets, polished aluminum shields, and surface treatments.
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