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Apollo 7 slow-scan TV, transmitted by the RCA command module TV camera. NASA decided on initial specifications for TV on the Apollo command module (CM) in 1962. [2] [ Note 1] Both analog and digital transmission techniques were studied, but the early digital systems still used more bandwidth than an analog approach: 20 MHz for the digital system, compared to 500 kHz for the analog system. [2]
Apollo TV camera; Hasselblad "Electric Camera" (modified 500 EL) with 70 mm film; Maurer Data Acquisition Camera (DAC) with 16 mm film; Nikon F with 35 mm film; Mapping (Metric) Camera (7.6 cm focal length) with 127 mm film, on Apollo 15, 16, and 17 (see Sherman Fairchild#Lunar photography) [1]
The contributors Oleg1000, ан_пердат, et al. are confused about parameters of the Apollo TV cameras in situ, NTSC TV standard, signal bandwidths and the video processing at the Earth. It appears they consider the Apollo TV camera, transmitter-receiver and post processing as a single unit or entity.
The TV is natively only capable of displaying 120 frames per second, and basic motion interpolation which inserts between 1 and 4 new frames between existing ones. Typically the only difference from a "120 Hz" TV in this case is the addition of a strobing backlight , which flickers on and off at 240 Hz, once after every 120 Hz frame.
The original slow-scan television signal from the Apollo TV camera, photographed at Honeysuckle Creek on July 21, 1969. The Apollo 11 missing tapes were those that were recorded from Apollo 11's slow-scan television (SSTV) telecast in its raw format on telemetry data tape at the time of the first Moon landing in 1969 and subsequently lost.
English: Video of the Apollo 11 launch, taken from the base of the Launch Umbilical Tower on the Mobile Launcher. Camera E-8 captured this footage on 16 mm film at 500 frames per second. This footage takes place within approximately 30 seconds of real time.
SSTV originally required quite a bit of specialized equipment. Usually there was a scanner or camera, a modem to create and receive the characteristic audio howl, and a cathode-ray tube from a surplus radar set. The special cathode-ray tube would have "long persistence" phosphors that would keep a picture visible for about ten seconds.
Astronauts manually flew Project Gemini with control sticks, but computers flew most of Project Apollo except briefly during lunar landings. [6] Each Moon flight carried two AGCs, one each in the command module and the Apollo Lunar Module, with the exception of Apollo 7 which was an Earth orbit mission and Apollo 8 which did not need a lunar module for its lunar orbit mission.