Defender Manpack Series

FPGA-based reactive jamming

Unlike conventional VCO-based jammers that broadcast continuously across all frequencies, Defender uses Field-Programmable Gate Array (FPGA) signal processing to detect threat transmissions and generate precisely targeted jamming within 18 μs. This reactive approach directs all available power to confirmed threat frequencies rather than spreading it across empty spectrum — extending effective jamming range by up to 3x compared to active (continuous) jamming at the same power level.

Three operational modes

Active — continuous broadband jamming across all configured frequencies. Maximum coverage, highest power draw. Use for known, persistent threat environments.

Semi-reactive — detects threats and activates a predefined jamming pattern across the entire configured range within 18 μs. Silent when no threat present. Medium power-to-range ratio.

Reactive — listen-only until threat detected, then targeted jamming of the specific signal within 36 μs. Silent when no threat present. Maximum power-to-range ratio. Ideal for battery-powered or covert deployments.

All three modes can be mixed simultaneously across different frequency channels within the same unit.

Jamming behaviour is defined by software profiles, not fixed firmware. Each profile specifies frequency ranges, power allocation per range, jamming algorithm, and operational mode — configured independently per range. Profiles are encrypted during transfer and decrypted on the jammer, preventing unauthorised configuration. Multiple profiles can be stored on-device and activated by field operators through Leo's simplified interface — enabling rapid adaptation to changing threat environments without returning equipment for reprogramming.