Read it carefully. Armstrong says the area around the LM is in shadow, but I believe he is saying that the brightly lit horizon will provide ebough infill to the scene. Then the communications are simply out for about four minutes. Houston did not communicate with Eagle during this time, or else it would have been in the transcript. Anything else you say to that effect is pure specualtion without proof.
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but what I'm asking is how could it have when Armstrong claims that he can hardly see where he's standing because the ladder is in complete shadow?
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So Armstrong did not actually say he couldn't see; he said
before he got out of the LM that some of the area around it was in shadow.
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Also could I ask if the radio system used in the Apollo missions was two way at the same time or could just either Houston or the Astronauts speak at one time? In other words could both be heard speaking over comms as the same time?
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No. The Capcom in Houston had a push-to-talk button that send a tone into the communications system, which began the transmissions. When he let go, a slighter lower tone went into the system, which ended it. The astronauts' communications system also had a push-to-talk system while they were in the CSM. In addition, there was a setting called "vox" in which the sound of the astronauts' voices would activate the microphone; I believe that this is the setting which the communications system was in during lunar EVA.
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And asks Armstrong to repeat what he said about the lighted horizon
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I don't see such a request in the transcript.