This video presents a detailed teardown and extensive reverse engineering of a 1999 Raytheon tank gunner sight display, a robust military-grade unit. The primary components include a Cathode Ray Tube (CRT), its high-voltage power supply, and a complex multi-layer "gunner board" primarily composed of analog circuitry. The creator successfully reverse-engineered the entire board, a process that took approximately 30 hours due to conformal coating and intricate design. The analysis delves into the vertical and horizontal deflection circuits, detailing their operation, signal characteristics (e.g., vertical current range of -600mA to 600mA, 100Hz frequency; horizontal inductive spikes up to 400V), and adjustment capabilities. The video also explores the sophisticated video amplifier circuit, which incorporates discrete components, CRT protection, blanking functionality, and a unique method for overlaying text or graphical patterns with adjustable luminosity. The CRT itself is a 2-inch display with impressive resolution (0.1mm per line) and a 70kHz horizontal frequency. While a functional test shows a clear image, a horizontal linearity issue is noted, suggesting a potential problem within the horizontal deflection system.
Exploring the Raytheon Tank Gunner Sight Display: A Deep Dive into its Analog Electronics
0:00 Raytheon Tank Gunner Sight Display: The video introduces a robust, military-grade display unit manufactured by Raytheon in 1999, identified as a "gunner sight display" and "gun and com display."
0:40 Core Components: The unit comprises a Cathode Ray Tube (CRT) with a 7kV post-acceleration power supply, and a complex "gunner board" featuring predominantly analog circuitry.
0:50 Intricate "Gunner Board": The main electronic board is multi-layer, coated with a conformal layer, and contains various analog ICs (quad op-amps, comparators, dual op-amps) and discrete components, making reverse engineering challenging.
4:58 Extensive Reverse Engineering: The creator successfully reverse-engineered the entire electronic board, a challenging process that took approximately 30 hours due to the conformal coating and complex multi-layer design.
5:05 Vertical Deflection Circuit: Detailed analysis of the vertical deflection system, which uses a digital trigger to generate a ramp signal. The circuit drives the vertical deflection coil with current varying from -600mA to 600mA at an optimum frequency of 100Hz (50% duty cycle). It includes amplitude and centering adjustments.
7:17 Horizontal Deflection Circuit: Explanation of the horizontal deflection, driven by a MOSFET that creates a linear current increase through the 110 Β΅H deflection coil. An adjustable constant voltage controls horizontal image size, and the circuit generates large voltage spikes (~400V) when the MOSFET switches off.
8:33 Sophisticated Video Circuit: The most complex section, featuring a discrete video amplifier connected to the CRT grid, supplied with 5V and -85V. It includes CRT protection, a blanking circuit, and a unique sub-circuit (using an MC1445 amplifier) for overlaying text or graphical patterns, with adjustable luminosity. A Baker clamp is used to accelerate transistor speed.
11:55 High-Resolution CRT: The display features an approximately 2-inch CRT with remarkable resolution, capable of drawing lines as fine as 0.1 millimeters, operating at a horizontal frequency of 70 kHz (with a range up to 100 kHz).
13:10 Observed Issue: A horizontal linearity issue is identified when a video signal is applied, suggesting a potential problem with the horizontal deflection system.