... Integrated superconducting submm receivers and spectrometers. ... The main objective of this work is to develop and test a family of Superconducting Integrated Receivers ( SIR ) with quantum-limited sensitivity and high-resolution spectrometers for submm wave frequencies (up to 700 GHz). ... Fig 10.a. Fig. 10.a. Spectra measured by Integrated Receiver (FFO frequency = 495 GHz) at the gondola altitude 30 km for the limb scanning in the range 10.5 - 30 km with 1.5 km increment (from top to bottom). ...