Mark A. answered 03/22/19
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"Transmit power" is a verb+object usage. For example, "In the U.S. an elaborate grid transmits power from one location to another." "Transmission power" is a noun phrase that can be understood as "the power associated with the transmission." Here's how that looks in a sentence from the Associated Press in 2009: "The drawback to this approach is that this extra 'carrier signal ' consumes some of the transmission power, reducing the signal-to-noise ratio of the data in the line."