In this video I study and operate a vintage directional gyroscope DG11-0105-1 manufactured by Humphrey Inc., San Diego, California. The heading is slaved to a flux detector connected to the gyroscope. A test is performed using an HSI Collins 331A-8K.

00:00 - Intro
00:40 - Teardown
03:34 - First test and gyro precession
04:50 - Final test with magnetic compass and Collins HSI
Reverse engineering:
06:32 - Part 1: overview
07:12 - Part 2: power supply
07:44 - Part 3: inner gimbal horizontal stabilization
08:48 - Part 4: input filter
10:53 - Part 5: amplifier and phase detector
12:29: Part 6: high speed slaving
13:27: Part 7: reference signals generator

HSI Collins 331A-8K:
   • LDM #346: HSI Collins 331A-8K - Part ...  

Schematic diagram :
https://mwblog.fr/wp-content/uploads/...
Blog:
https://mwblog.fr/?p=804&preview=true