As Don suggested I checked RF signal on U1, U2, D2, Q2 and Q1.
For the last component, surprisingly, I found it was missing!
I checked it on assembly step, on page 28, but I didn't install it at all.
So I have installed the 2N7000 FET and now S-meter is working very well
(using factory defaults).

Thank you again Don!

73', Enzo
IW7DMH


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