PT Unknown AU Maslennikov, S Antipov, S Shishkov, A Svechnikov, S Voronov, B Smirnov, K Kaurova, N Drakinski, V Gol'tsman, G TI NbN HEB mixer noise temperature measurements with hot/cold load mounted inside the helium cryostat at 300 GHz SE Proc. Int. Student Seminar on Microwave Appl. of Novel Physical Phenomena supported by IEEE PY 2002 PI St.-Petersburg ER