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The combination of the ATN PVS-31 housing with L3Harris 22UM / 22UA tubes is a high-professional solution for users who require exceptionally stable and clean Gen 3 Unfilmed White Phosphor performance, but are not yet moving into the top-tier 24-series or full contract-grade classes.
The 22UM / 22UA series is known for its superior signal-to-noise balance, low noise levels, and very clean image field — representing the optimal point between price, image quality, and operational stability.
⚙️ Technical Specifications
| Parameter | Value |
|---|---|
| Housing | ATN PVS-31 |
| IIT Type | L3Harris 22UM / 22UA |
| Tube Format | MX-10160 |
| Phosphor | White Phosphor |
| Figure of Merit (FOM) | ≥ 2300+ |
| Signal-to-Noise Ratio (SNR) | ≥ 30 |
| Resolution (RES) | ≥ 64 lp/mm |
| Halo | ≤ 1.0 |
| EBI | ≤ 1.5 |
| Auto-Gating | Present |
| System Weight | ~450 g |
| Power Supply | 1× CR123A or external power pack |
| Tube Service Life | ≈ 10,000 hours |
Comment / Quality Level
The 22UM / 22UA series represents a clear step up in class:
• significantly cleaner imagery compared to 18UM / 20UM;
• characteristically high stability with almost no micro-noise artifacts;
• high SNR performance that excels in open terrain, dark woodland, and minimal-illumination environments;
• low EBI enables visibility of textures and structures even under moonlight or starlight;
• the unfilmed architecture provides better performance near bright-light sources.
In the PVS-31 housing, these tubes reveal their full advantages: excellent ergonomics, low overall weight, independent pod articulation, and support for external-power operation.
Suitable For
• Professional operators who require high image cleanliness and maximum stability;
• reconnaissance and observation teams working in challenging lighting conditions;
• UAV operators who rely on detailed imaging under fully passive light;
• security and response units that require high SNR and operational reliability;
• users seeking performance close to the 24-series level but with a more efficient budget;
• volunteers and civilian professionals selecting a high-end segment with maximum nighttime effectiveness