Apollo Command Module (Block II) Pulse Code Modulation (PCM) Telemetry Assembly, measuring 14" x 7" x 13.5" and weighing approximately 42.5 pounds, manufactured by Radiation, Inc., Melbourne, Florida. The face bears 18 connector ports, with two lower labels showing designations and marked "C13-1A101," and the top and left sides features metal part plates: "Serial No. 071208040021, Part No. 514-0045-011," "PCM Telemetry Equipment, NAA S&ID PN 901-0719-0008, Contract No. NAS 9-150, Date of Mfr. 14 Apr 69, Collins Radio Co. PN 514-0041-014…Serial No. 071208040021," and "NASA, Manned Spacecraft Center, Property of U.S. Government, 99971," with yellow "1976" sticker. In fine condition, with scattered marks and wear. The unit received and sampled analog, parallel digital, and serial digital information, which consists of astronaut biomedical, spacecraft operation, and scientific data. It then converted the data to a single serial output for transmission to Earth. This single-output signal was routed to the Premodulation Processor for transmission to the ground or to Data Storage Equipment.
