Professional Stability in a Truly Portable Form
Following the release of P-US-30, thejammerblocker introduces the P-US-J28, a next-generation portable jammer engineered for users who care as much about stability and thermal performance as they do about frequency coverage.
Unlike P-US-30, which focuses on antenna expansion and spectrum extension, P-US-J28 takes a different upgrade path. Built on the proven P-US-027 platform, this model has been structurally redesigned to dramatically improve heat dissipation and long-term operating stability. After extensive real-world testing, users consistently report smoother performance and reduced thermal throttling—placing it closer to desktop-grade reliability than typical handheld jammers.
28 Bands, One Device — Full-Spectrum Control
Despite its compact size, P-US-J28 delivers impressive coverage across 28 independent frequency bands, including:
- Cellular networks: 2G / 3G / 4G / 5G
- Wireless data: Wi-Fi 2.4G, 5G, and Wi-Fi 6E
- Navigation systems: GPS L1–L5
- Radio & control signals: UHF, VHF, LoJack, RC 315 / 433 / 868 MHz
- LoRa and FM Radio
This wide spectrum coverage makes the P-US-J28 a practical choice for personal protection, privacy enforcement, and controlled environments where multiple wireless standards coexist.
Advanced Cooling That Sets It Apart
What truly defines the P-US-J28 is its enhanced thermal architecture.
The device features a full aluminum alloy housing with integrated fin-style heat dissipation, increasing surface area while improving grip and handling. Inside, four high-efficiency cooling fans actively manage internal temperatures, keeping the system quiet, cool, and stable—even during extended use.
This design not only improves reliability but also extends component lifespan, a critical advantage for users who operate jammers frequently or in warmer environments.
Smart Control, Clear Visibility
An integrated LCD display provides real-time feedback on battery level and signal strength, so you’re never guessing how the device is performing. Individual DIP switches allow you to enable or disable specific frequency bands instantly, giving you precise control without unnecessary interference.
With a total output power of 28W, the P-US-J28 strikes an ideal balance between portability and effectiveness—powerful enough for real-world suppression, yet compact enough for mobile use.
Designed for Mobility
Despite its performance, the P-US-J28 remains genuinely portable:
- Lightweight, backpack-friendly design
- Supports vehicle operation via 12V car charger
- Can be worn or carried discreetly
- Built-in 12000mAh battery delivers up to 80 minutes of continuous operation
Whether you’re on the move, in a vehicle, or working across multiple locations, this jammer adapts easily to your workflow.
Key Advantages at a Glance
- 28-band full-spectrum signal suppression
- High-gain omnidirectional antennas for consistent coverage
- Desktop-level cooling performance in a portable form
- Quiet operation with four integrated fans
- LCD screen for battery and signal monitoring
- Independent band control via DIP switches
- Vehicle-ready and travel-friendly
- Durable aluminum housing with improved grip
Technical Specifications – P-US-J28
- Model: P-US-J28
- Jamming Type: Portable Full-Band Signal Jammer
- Total Output Power: 28W
- Output per Channel: 1W (30 ±1 dBm)
- Number of Channels: 28 independently controlled bands
- Jamming Radius: Approx. 2–25 meters (depending on ambient signal strength)
- Antenna Type: High-gain omnidirectional antennas
- Cooling System:
- Aluminum alloy heat sink with fin-style structure
- 4 integrated low-noise cooling fans
- Display: LCD screen (battery level & signal status)
- Control Method: Individual DIP switches for each band
- Power Supply:
- AC 110–240V to DC 12V adapter
- Vehicle power support (DC 12V, ≥10A recommended)
- Battery: Built-in 7.4V / 12000mAh lithium battery
- Operating Time: Up to 80 minutes (battery only)
- Charging Mode: Supports charging while operating (recommended ≤3 hours continuous use)
- Dimensions (without antennas): 210 × 132 × 85 mm
- Net Weight: Approx. 3.0 kg
- Housing Material: CNC aluminum alloy
- Color: Black
- Warranty: 1 year
Package Contents
- 1 × P-US-J28 Portable 28-Band Signal Jammer
- 27 × High-gain omnidirectional antennas
- 1 × AC power adapter (110–240V)
- 1 × DC 12V vehicle charger
- 1 × Heavy-duty portable carrying case
- Case size: 340 × 330 × 140 mm
- Case weight: approx. 2.0 kg
- 1 × User manual
28-Channel Frequency Coverage Table
| Channel | Band / Protocol | Frequency Range | Output Power |
|---|---|---|---|
| CH1 | VHF / LoJack | 135–175 MHz | 30±1 dBm / 1W |
| CH2 | 5G 600 | 617–698 MHz | 30±1 dBm / 1W |
| CH3 | 5G 3700 | 3600–3900 MHz | 30±1 dBm / 1W |
| CH4 | 3G 2100 | 2110–2180 MHz | 30±1 dBm / 1W |
| CH5 | RC-868 | 868 MHz | 30±1 dBm / 1W |
| CH6 | Wi-Fi 5.2G | 5100–5500 MHz | 30±1 dBm / 1W |
| CH7 | 4G 2600 | 2620–2690 MHz | 30±1 dBm / 1W |
| CH8 | 4G 800 | 790–826 MHz | 30±1 dBm / 1W |
| CH9 | FM Radio | 80–108 MHz | 30±1 dBm / 1W |
| CH10 | RC-433 | 433–434 MHz | 30±1 dBm / 1W |
| CH11 | 4G 700 | 700–803 MHz | 30±1 dBm / 1W |
| CH12 | GPS L1 | 1560–1610 MHz | 30±1 dBm / 1W |
| CH13 | LoRa / RC-915 | 900–930 MHz | 30±1 dBm / 1W |
| CH14 | 4G 2500 | 2500–2620 MHz | 30±1 dBm / 1W |
| CH15 | GPS L2–L5 | 1170–1390 MHz | 30±1 dBm / 1W |
| CH16 | CDMA 850 | 851–894 MHz | 30±1 dBm / 1W |
| CH17 | 4G 1700 | 1710–1780 MHz | 30±1 dBm / 1W |
| CH18 | Wi-Fi 6E | 5925–6425 MHz | 30±1 dBm / 1W |
| CH19 | RC-315 | 315 MHz | 30±1 dBm / 1W |
| CH20 | GSM 900 | 925–960 MHz | 30±1 dBm / 1W |
| CH21 | DCS 1800 | 1805–1920 MHz | 30±1 dBm / 1W |
| CH22 | Wi-Fi 2.4G | 2400–2500 MHz | 30±1 dBm / 1W |
| CH23 | Wi-Fi 5.8G | 5500–5900 MHz | 30±1 dBm / 1W |
| CH24 | 5G 3300 / 3500 | 3300–3600 MHz | 30±1 dBm / 1W |
| CH25 | UHF / CDMA 450 | 400–470 MHz | 30±1 dBm / 1W |
| CH26 | 5G 1500 | 1427–1518 MHz | 30±1 dBm / 1W |
| CH27 | PCS 1900 | 1920–2000 MHz | 30±1 dBm / 1W |
| CH28 | 4G 2300 | 2300–2400 MHz | 30±1 dBm / 1W |
