Abstract
We present the results of stability testing of a terahertz radiometer based on asuperconducting receiver with a SIS tunnel junction as the mixer and a flux-flowoscillator as the local oscillator. In the continuum mode, the receiver with a noisetemperature of 95 K at 510 GHz measured over the intermediate frequency(IF) passband of 4–8 GHz offered a noise equivalent temperature difference of10 ± 1 mK at an integration time of 1 s. We offer a method to significantly increase the integrationtime without the use of complex measurement equipment. The receiver observed a strongsignal over a final detection bandwidth of 4 GHz and offered an Allan time of 5 s.
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