NCR radio parts is a quest item in the quest Wheel of Fortune and cannot be dropped.
The parts can be found inside the Searchlight police station.
PC Unlike other items scavenged during Wheel of Fortune, these and the NCR computer parts only exist as quest items, and cannot be dropped once looted from Logan. On a PC, use console command player.removeitem 001482F6 10 to clean them out of the inventory. [verified]