Compare the NF of ATF33143feb with the NF of FHX05FAnov
(Jan 30 2013)

The average S/N is -0.1698 for ATF33143feb while the FHX05FAnov shows S/N=-0.1767 with a known NF of 0.1846 dB. The correction for the S/N scale to show NF (with reversed sign) is to add -0.0079 dB.

From this comparison one would conclude that the NF of the ATF33143feb is 0.1777 dB.