PURPOSE:To reduce outer shape dimension and wt. and to always enable observation on a track, by using a multichannel high temp. noise source as a temp. calibration source. CONSTITUTION:The noise temp. of a multichannel comparing noise source 12 is guided to a receiver 10 by changing over a switch 8. Next, when the switch 8 is changed over, the noise temp. from a multichannel high temp. noise source 11 or antenna temp. is guided to a receiver 10 according to the position of a switch to generate respective predetermined voltages. By mounting a temp. sensor to the noise sources 12, 11, the input temp. of both receivers 10 can be determined.
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