b4limits.com

What It Is

B4 Limits is a manufacturer of RF jamming systems based in Białystok, Poland. Its core products are the Defender series of FPGA-based reactive RF jamming devices, aimed primarily at counter-UAV, communications suppression, prison facility, and defense/security scenarios. The company states that it is a NATO-registered supplier, with NCAGE code 99YVH, and that its products are designed and manufactured in Poland.

Core Capabilities and Deployment

Defender is not focused on traditional continuous wideband “blanket” jamming. Instead, it uses FPGA-based detection of threat signals and rapidly generates targeted interference. Public specifications list frequency coverage of 20–8000 MHz, semi-reactive response of 18 μs, reactive response of 36 μs, and up to 55,000 hops/s. It supports three modes—Active, Semi-Reactive, and Reactive—and can be configured by mission for frequency bands, power, algorithms, and antennas. Deployment options include the Modular series and a Manpack series weighing around 32 kg, supporting standalone use, vehicle-mounted operation, fixed sites, multi-module arrays, and synchronized multi-unit networking.

Management, Alerts, and Integration

Centralized control and monitoring are handled by the Leo software, which supports role-based permissions, encrypted jamming profiles, real-time spectrum visualization, TX output overlays, and rapid activation of preset configurations. Lemur is used for in-browser training and automated assessment. For integration, Defender supports REST API and NATO SAPIENT, allowing it to serve as the engagement layer in a counter-UAV detect-track-classify-engage chain, working alongside third-party radar, EO/IR, and RF detection systems.

Pricing and Compliance

The website does not disclose pricing, and the product is clearly positioned as a customized, project-based procurement depending on frequency bands, power, antennas, module count, and use case. The standard warranty is 2 years and can be extended to 5 years. In terms of compliance information, in addition to its NATO NCAGE code, the company also discloses D-U-N-S, Polish registration details, and a permit for trade in goods of strategic importance. However, RF jamming equipment itself is heavily regulated, and procurement and use must comply with local radio, military goods, and law-enforcement licensing requirements.

Pros, Cons, and Who It’s For

Its strengths include a reactive architecture that can improve power efficiency, software-defined configuration for better field adaptability, open protocols that support system integration, and an accompanying training platform. Its weaknesses are the lack of public details on pricing, lead times, SLA, and independent testing; the manpack equipment is still relatively heavy; and the nature of the product means it is not suitable for ordinary commercial cybersecurity users. It is better suited to defense, critical infrastructure, prisons, convoy protection, forward operating bases, and professional counter-UAV integration projects.

Access from China and Alternatives

The website does not state availability, payment, or delivery conditions for mainland China, so these should be considered unknown. Even if accessible, importing, selling, and using RF jamming equipment in China involves strict radio and security regulations and should not be treated like purchasing a regular security product. Possible alternatives include compliant domestic counter-UAV detection, localization, spoofing, or licensed mitigation systems.