TV from the Moon

The television camera taken to the lunar surface was a slow-scan black and white camera with a vertical resolution of 320 lines scanned at 10 frames per second. This camera was chosen because the available bandwidth from the Moon (700kHz) was not sufficient for a standard TV signal.

On Earth, the received slow scan signal was converted to a standard TV picture (in this case, the American standard of 525 lines and 30 frames per second) using specially built scan converters. At Goldstone and Honeysuckle, the conversion was done on site. The Parkes slow scan TV signal was sent to the OTC (Overseas Telecommunications Commission) Paddington gateway exchange in Oxford Street, Paddington, in Sydney and converted there.

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Ed von Renouard writes,

\ufffdfor Apollo 11 we had the M22 telemetry recorders going at 120 ips (reel change every 1/4 hr for the duration of the mission) which also recorded the narrow-band slow scan TV downlink, and we had an ageing broadcast quality Ampex VR1100 4-head desk-size video recorder with 2-inch tapes to record the scan-converted NTSC-standard output TV fed to the US. This machine overheated during the downlink and kept on blowing fuses so we ended up opening its rear doors and positioning two desk fans to keep it cool. This worked and we were able record the rest of the TV.\ufffd