Le labo de Michel | LDM #373: analysis of a 9E420 Radar seeker electronic board @lelabodemichel5162 | Uploaded 2 months ago | Updated 2 hours ago
After some researches this board is used in a 9E420 radar seeker: ausairpower.net/PVO-SV/9M317E-Buk-M2E-9E420+Slantets-1S.jpg
This board is probably involved in the servo control of the antenna position.

00:00 - Intro
01:57 - Inside the shield
02:47 - Reverse engineering
04:07 - Attenuators
04:36 - Amplifiers and bad guarding tracks
05:44 - Analog switch control
05:58 - Colpitts oscillator
07:15 - Oscillator test

Schematic diagram in pdf: https://mwblog.fr/ldm-373-analysis-of-a-kh-101-missile-electronic-board/