Engineering development model of the Apollo Block I/II VHF/AM radio, used in development and testing; these are identical to the flight units, but have some additional connectors for testing. The larger unit (Block I) measures 10.25″ x 6″ x 13″, and bears a tag on the front: "VHF/AM XMTR-RCVR EQUIP.-VHF RECY BCN EQUIP., NAA ME 478-0023-0043, Collins Part No. 512-4143-030, Type No. 718P-1F, Mfd by Collins Radio Co. for Apollo Spacecraft, Serial No. 026720020006." The smaller unit (Block II) measures 4.75″ x 6″ x 12″, and bears a tag on the front: "VHF/AM Equipment, NAA S&ID PN ME-478-0067-0009, Contract No. NAS 9-150, Date of Mfr. 12.23.68, Collins Radio Co. PN 514-0021-016, Mfd. by RCA for the Apollo Spacecraft, Serial No. 071368030020." Also bears a "Class III, Not For Flight" label, and handwritten annotation, "S/C 110." In fine condition. The “S/C 110” notation means that this unit was likely installed in CSM-110 (Apollo 14) at one time. It was then likely removed either because of an anomaly found during preflight testing or for postflight evaluation. There is no documentation to confirm either scenario.
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