In the movie, First Man (2018), Neil Armstrong is getting into Gemini 8 space craft. He overhears capcom voice:
CARNARVON CAPCOM: Guaymas, read you loud and clear. We have S band track. We have just locked up on T.M.
What is the meaning of "T.M"?
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Russell Borogove
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H.M.K Thomas
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It won't help for Gemini-specific questions, but the annotated Apollo flight journals explain a lot of the jargon of the period. You might enjoy them. – Russell Borogove Feb 18 '19 at 22:14
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Most likely Telemetry.
https://www.acronymfinder.com/Telemetry-(TM).html
Although usually TLM is used.
The "locking" terminology is explained here : What is carrier lock and bit lock?
Organic Marble
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