WWII U.S. Army Signal Corps TN-87/AP Tuning Stub – Bird Engineering Co. Aircraft Radar RF Component

WWII U.S. Army Signal Corps TN-87/AP Tuning Stub – Bird Engineering Co. Aircraft Radar RF Component

Original WWII U.S. Army Signal Corps TN-87/AP Tuning Stub manufactured by Bird Engineering Co. under Order No. 1344-DAY-44. This precision adjustable RF tuning stub was used in airborne radar and radio-frequency systems to tune transmission lines and optimize impedance matching during testing and operation. The graduated scale and robust construction reflect its role in maintaining peak performance of wartime electronic equipment. A desirable piece for collectors of WWII Signal Corps equipment, radar systems, Bird Engineering instruments, or military communications displays. Good original condition with clear data plate and intact graduated scale as shown.