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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 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.
Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color. A literal term for SSTV is narrowband television .
25-th page "The Apollo Slow Scan Lunar Camera was never used again after Apollo 11. However, the cameras were carried on Apollo 13, 14, 15 and 16" 27-th page "The Westinghouse color camera video signal ran out to nearly 3 MHz" 37-th page "5 MHz video bandwidth" 41-th page "All three Apollo J-series missions (15, 16 and 17) conducted CSM EVA's ...
The scanner that produced the beam had a 50-aperture disk. The disc revolved at a rate of 18 frames per second, capturing one frame about every 56 ms. (Today's systems typically transmit 30 or 60 frames per second, or one frame every 33.3 or 16.7 ms respectively.) Television historian Albert Abramson underscored the significance of the Bell ...
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In a CRT, the vertical scan rate is the number of times per second that the electron beam returns to the upper left corner of the screen to begin drawing a new frame. [3] It is controlled by the vertical blanking signal generated by the video controller, and is partially limited by the monitor's maximum horizontal scan rate.