NF calculation referred to the LNA input

Hello,

I didn't the calculation (FRIIS formula), but I assume that NF referred to the LNA input is calculated by considering that the receiver starts at the LNA input.
Hope this helps

I've calculated the NF with considering that the receiver starts at the LNA input and the active antenna and SAW filter are excluded. But the result is 7.39dB, which is different from the number given on the paper, 7.43dB. So the active antenna and SAW filter must be included in the calculation. But I don't know how to do that.

It's possible that they have 20 or 30 dB NF looking into the second mixer and filter stages. Seems a bit high, but not too high. Looking at the lineup in figure 2, there aren't any numbers for the NF looking into the 2nd mixer, and there's 35 dB of gain in front of that, so you may be in the ballpark.

Dave

You are really complaining a difference 0.04 db in NF calculation? Cool, man.

The difference of 0.04dB is little but it means something is wrong in calculation that is important. Isn't it?