I've given the seller the deserved 1-star feedback, of course.
I had few problems with this kit: L2 was faulty and Q1 smoked. I had to replace both. C4 and C6 appear to be faulty too, I've bought replacements today.
My problem is heavy noise that is definitely not "white noise": here is the signal from test lead,
and here - without leads connected at all:
(ignore the non-square shape of test waveform - it should get fixed as soon as I replace varicaps). I use standard 220V to 9V adapter that came with Arduino UNO.
What can be the source of this noise? Which connections should I check?
I washed the board from flux like crazy, and re-soldered every connection twice.
