Amplitech Group Inc (AMPG)

[Advisors]

Iam the only one here, (besides CEO Fawad or his rep if they post here) who knows for a FACT they cannot test Cryogenics at liquid He2 (Helium) esp. laughable 2*Kelvin claims. Imaginary plots are actually typical for companies who cannot afford a real Helium rig & are based on physics/math formula for Johnson's-Nyquist component of NF vs. Temperature. As such, JMD NY is totally correct you cannot trust this estimate, fully: a real NF is higher as it accounts for more than just Nyquist (thermal stochastics) contribution,
AmpliTech's (AMPG) plots below room temp. 23*C are an ESTIMATE, not real lab/test data. Kudos to JMD NY, he is correct, I wonder if he's famous Javed who runs B&Z Technologies who makes even better LNA's in upper MW & mmW bands & Waveguides, better than AmpliTech.

Note that NoiseFigure (NF) in rare circumstances is NOT an ultimate judge of noise performance - in cold setups e.g. antenna pointing in Space far above earth, a lower NF amplifier is NOT necessarily less noisier/better, NF is merely a figure of merit.
Anyways, JMD NY is correct on his subject