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Apollo Command Module Telecommunications System Unified S-Band Amplifier, measuring approximately 22″ x 5.75″ x 6″, with the Collins Radio manufacturer's plate removed from the side. The top panel is marked "C28-1A104," and features inset ports marked "J1" through "J5." The Apollo CM's S-band power amplifier equipment was used to amplify the radio frequency output from the S-band transmitters when additional signal strength was required for adequate reception by the ground.
