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The full spectrum of the radio signal transmitted to the Earth contained both the telemetry and the TV separately. The TV was frequency modulated (FM) on the carrier, and the sub-carriers, which were phase modulated (PM) at several different frequencies, contained the telemetry information, including the audio. So while the majority of the TV of the Moonwalk broadcast to the world was via the 64m Parkes Radio Telescope in Australia, the audio downlink broadcast to the world was exclusively via the Goldstone antenna.
Basically, there were three tracking stations receiving the signal simultaneously: Goldstone, Honeysuckle Creek, and Parkes. A controller at Mission Control in Houston then selected the TV signal that was broadcast to the world. During the first eight minutes and 51 seconds of the TV broadcast, the source of the TV that was broadcast to the world alternated between the Goldstone and Honeysuckle Creek tracking stations. The grainy TV images of Armstrong stepping onto the Moon were sourced from the NASA tracking station at Honeysuckle Creek outside Canberra. At eight minutes and 51 seconds into the broadcast, the TV was finally switched to Parkes. Since the Parkes TV picture quality was superior to the other two stations, NASA remained with Parkes as the source of the TV pictures for the remainder of the over 2.5 hour broadcast. Now, while the TV was through Parkes (and the other stations at the beginning), the audio downlink used for the broadcast was exclusively via the Goldstone station throughout.
Therefore, the audio that Peter Shann Ford used to analyse Armstrong's words were most likely sourced from Goldstone, not Parkes. That is, the TV pictures and the audio were sent separately on the one signal transmitted from the Moon.
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