VS-PJ-SDR-S Intelligent Detection & Responsive SDR Signal Interference System
The VS-PJ-SDR-S is an all-in-one integrated signal control terminal independently developed by SZ Vodasafe, tailor-made for high-security scenarios such as prisons, detention centers and confidential venues. It adopts advanced Software Defined Radio (SDR) architecture that merges full-band real-time spectrum detection and adaptive intelligent signal interference into a single outdoor unit, eliminating reliance on external computers for operation.
Built around an internal wideband SDR transceiver and high-speed signal processing core, this unit can autonomously scan, identify, locate and precisely suppress mainstream wireless communication signals including 2G, 3G, 4G, Sub-6GHz 5G NR, Wi-Fi and Bluetooth. Its core operating logic follows a detection-triggered interference mechanism: the equipment maintains low-power panoramic electromagnetic spectrum scanning under standby conditions. Once illegal mobile communication signals are captured, it instantly launches synchronous targeted interference on matching frequency points; within milliseconds after target signals vanish, the system automatically switches back to silent monitoring mode to cut unnecessary RF radiation.
Core Hardware & Detection Technical Performance
The VS-PJ-SDR-S covers a full operating frequency range from 600 MHz to 6000 MHz, supporting a maximum real-time detection bandwidth of 400 MHz with ultra-high detection sensitivity reaching ≤ -100 dBm, which enables it to capture faint mobile terminal uplink signals in complex electromagnetic environments.
In terms of signal demodulation and recognition capacity, the device fully supports mainstream cellular communication standards: 2G GSM/GPRS, 3G WCDMA and CDMA2000, 4G TDD/FDD-LTE, as well as Sub-6GHz 5G NR networks. It can conduct in-depth feature analysis of captured signals, extracting key parameters including frequency points, channel numbers, RSSI signal strength, occupied bandwidth, and uplink-downlink timeslot ratios exclusive to TDD communication systems.
The equipment delivers extremely fast scanning and trigger response speed. A full-band spectrum detection cycle takes less than 1 second, and the interval between signal detection and interference activation is controlled under 100 milliseconds, achieving near-instantaneous signal suppression.
Three Adjustable Intelligent Interference Modes
Users can switch between three independent working modes to match different security management demands, each with distinct operational logic and radiation characteristics:
- Following Silent Sniper Mode
This low-radiation intelligent mode transmits no interference waveforms when no mobile signals are detected. The moment the unit catches sudden uplink signals from inmate mobile phones, it immediately outputs high-precision targeted interference on corresponding downlink frequency bands. Once the terminal uplink signal disappears, all interference output is shut down within milliseconds, minimizing continuous electromagnetic radiation to the surrounding environment.
2) Zone Resident Micro-Power Mode
After locking the frequency bands of designated mobile operators, the device only emits milliwatt-level correlated interference targeting signaling channels. This keeps all mobile terminals within coverage continuously displaying "No Service" without generating extensive RF pollution that disturbs public communication infrastructure outside the controlled area.
3) Full-Band Forced Blocking Mode
Activated manually or under emergency security situations, this mode continuously outputs swept and modulated interference signals across the complete 600MHz–6GHz spectrum, achieving full physical suppression of all nearby wireless communications via brute-force wideband coverage.
4) Interference Band, Power & Waveform Technology
The VS-PJ-SDR-S supports concurrent operation of all covered communication bands, with each standardized frequency segment equipped with 30 dBm rated transmit power. The covered mainstream cellular bands include 794–862MHz N20 FDD-LTE, 880–960MHz N8 FDD-LTE, 1710–1880MHz N3 FDD-LTE, 1920–2170MHz N1 FDD-LTE, 2300–2400MHz N40 TDD-LTE, and 3400–3800MHz N78 TDD-LTE. The overall rated total RF output power of the whole machine is capped at 60W.
For coverage range, the effective interference radius reaches 5 to 40 meters in open outdoor spaces, subject to the signal strength of surrounding public base stations; indoor coverage distance will shrink accordingly due to signal attenuation caused by walls and building partitions.
The equipment adopts two leading interference waveform technologies to boost suppression efficiency while reducing power consumption:
First, precise protocol targeting technology. It locks LTE and 5G NR synchronization and broadcast channels including PSS, SSS and PBCH, requiring only milliwatt-level power to force mobile terminals to disconnect from cellular networks.
Second, TDD timeslot synchronized interference. For 5G TDD networks, the unit automatically learns base station frame structures and only injects interference during downlink timeslots, maximizing energy utilization and avoiding invalid radiation during uplink transmission windows.
5) Microsecond-Level Detection & Interference Coordination
The integrated hardware design of VS-PJ-SDR-S delivers its most competitive merit: microsecond-grade coordination between spectrum detection and interference emission, realized through three core closed-loop control mechanisms:
Full-Duplex RF Isolation
An internal high-isolation circulator and RF switching matrix are integrated inside the unit. When interference output is active, the receiving detection chain automatically enters protected attenuation status to avoid saturation by self-transmitted signals; the instant interference transmission stops, the detection circuit resumes full-spectrum monitoring without delay.
Closed-Loop Self-Power Regulation
After interference activation, the built-in detection module continuously monitors signal strength within the jammed frequency band. Once the system confirms target communication signals are fully suppressed and signal power drops below the preset threshold, the internal power amplifier automatically reduces output power to maintenance levels, eliminating redundant long-term radiation.
Self-Interference Learning Algorithm
The equipment is pre-calibrated with its own interference signal characteristics. During transmission, embedded software algorithms automatically filter leakage signals from the internal power amplifier, retaining full sensitivity to capture weak external environmental signals without blind monitoring gaps.
6) Physical & Electrical Specifications
The VS-PJ-SDR-S features an integrated outdoor directional panel housing with overall dimensions of 400mm × 200mm × 155mm and a total weight of 7 kilograms. All RF antenna components are pre-installed inside the casing, requiring no external antenna assembly during deployment.
For power supply, the unit supports standard AC 220V ±10% 50Hz mains input. Power consumption varies by working mode: less than 50W under pure detection standby mode, below 80W in Silent Sniper mode, and under 120W when running full-band forced blocking. The metal rear shell is equipped with dense fin heat sinks for passive heat dissipation, suitable for long-term continuous operation under harsh temperatures ranging from -40°C to +60°C. The designed mean time between failures (MTBF) reaches no less than 50,000 hours, meeting 24/7 year-round stable operation requirements for correctional facilities.
Two installation options are supported via the matching metal mounting bracket: pole mounting for open yards and wall mounting for corridor, cell and perimeter wall deployment.
7) Independent Local Control & Centralized Network Management Functions
Local Standalone Control
Two convenient local operation methods are provided for single-device management:
Infrared remote control: Quickly switch working modes between Silent Monitoring, Automatic Intelligent Interference and Manual Forced Jamming without network access.
Wired Ethernet connection: Connect a computer to the device via network cable and access the built-in web management page through any browser, where operators can adjust working modes, set signal trigger thresholds, configure band power parameters and view real-time spectrum data.
Multi-Device Networking & Platform Coordination
The VS-PJ-SDR-S supports large-scale distributed deployment for multi-story prison buildings and multi-zone correctional campuses. Multiple units deployed on different floors or zones can be uniformly wired to a central server for unified platform monitoring and remote control. Equipment located across different regional sites can also be connected to one unified cloud management platform by configuring static IP addresses, enabling centralized real-time status monitoring, mode switching and fault alarm notification from a single management terminal.
Application Scenarios
SZ Vodasafe VS-PJ-SDR-S is purpose-built for high-security confined environments, primarily deployed in prisons, detention houses, judicial custody centers, confidential conference venues and military restricted areas. Its intelligent low-radiation design avoids excessive interference to external public communication networks, while the rapid response detection-jamming linkage effectively blocks illegal mobile phone communication, preventing inmate smuggling, escape coordination and confidential information leakage caused by unauthorized wireless devices.
