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Hello, I am using a PNA-X Win 7 version with opt 29 hardware noise figure hardware capability to measure noise figure for a downconverter with gain about 58. I am using A.10.20.02 firmware. I am also using the power meter method.  The Noise figure settings I am using are: Noise Bandwidth 2MHz Averaging on at 25 Noise Receiver

Many Agilent noise figure equipment has lower frequency limit at 10MHz. What is the best way or methods (including equipment setup, etc) to measure the noise figure at low frequency accurately say from 1KHz to 10MHz?