LDM
After some researches this board is used in a 9E420 radar seeker: https://www.ausairpower.net/PVO-SV/9M...
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...