?Francesco,

I want to say I might be wrong here so, please double check me.

In your drawing you show the 20db attn connected to the input of the amp I assume this is to prevent over driving your amp. ?However, you do not have an attn on the output side.

Is this accurate? ?

I have read that you will damage your VNA if you apply to much of an input. S21 port, So in my mind, you should have an attn on both the input and output to protect the VNA? ?If this is not necessary please let me know.

Good luck in your efforts?

?

Tom Anderson

SDR_Radio@...