Compare the NF of ATF33143feb with the NF of MGF1801
(Jan 30 2013)

The average S/N is -0.1758 for ATF33143feb while the MGF1801 shows S/N=-0.2866 with a known NF of 0.2874 dB. The correction for the S/N scale to show NF (with reversed sign) is to add -0.0008 dB.

From this comparison one would conclude that the NF of the ATF33143feb is 0.1766 dB.