WR28 (UG381/U round flange input) Tunable Detector Mount, positive polarity, 1N53 diode, E-H plane tuner precedes diode & tunable backshort follows diode, BNC(f) output

WR28 (UG381/U round flange input) Tunable Detector Mount, positive polarity, 1N53 diode, E-H plane tuner precedes diode & tunable backshort follows diode, BNC(f) output