LPDP-20-3000L

The LPDP-20-3000L is an ultra-wideband Tactical Dual Polarized Log Periodic Dipole Antenna (LPDA) engineered for comprehensive spectrum dominance from 20 MHz to 3000 MHz. By integrating advanced loading techniques, this antenna achieves a 3-meter footprint—a massive reduction in size for an array capable of low-VHF operation. Its dual-polarized cross-element architecture allows for the simultaneous interception or transmission of both vertical and horizontal signals, making it the definitive "all-in-one" solution for SIGINT, tactical monitoring, and high-power jamming across HF, VHF, UHF, and S-Band frequencies.

Design: Total Spectrum Dominance

The LPDP-20-3000L is designed for tactical units that cannot afford to carry multiple antennas for different frequency bands.

• Size-Reduced Loading: Advanced internal loading allows this 3-meter array to maintain high efficiency at 20 MHz while continuing to perform seamlessly up to 3000 MHz. This eliminates the need for antenna swaps during mission-critical frequency shifts.
• True Polarization Diversity: With 2 x N-Female ports, the antenna captures E & H polarized signals simultaneously. This is essential for defeating "polarization rotation" caused by signals bouncing off urban structures or rotating through the ionosphere.
• Maintenance-Free Passive Design: The antenna is fully passive, containing no active tuning circuits. This ensures a high MTBF (Mean Time Between Failure) and a completely linear response across the entire 2.98 GHz bandwidth.

Construction: Field-Hardened Logistics

Constructed from 6063T6 architectural anodized aluminum alloy, the LPDP-20-3000L is built for rapid-response maneuvers.

• 10-Minute Rapid Assembly: Featuring foldable elements and a fast-deployment self-locking device, the system can be operational in minutes. The support boom and elements are segmented, reducing the shipping length to a manageable 1.8 meters (6 feet).
• MIL-STD-810G Survival: The structure is finished in Olive Green RAL 6003 epoxy powder coating. All hardware is made from Type 316 marine-grade stainless steel, ensuring zero corrosion during salt fog, rain, or high-humidity operations.
• D.C. Grounded Safety: Provides a low-resistance path for lightning protection and suppresses atmospheric static, resulting in an ultra-quiet noise floor for sensitive surveillance receivers.

Technical Features

• Ultra-Wideband 20–3000 MHz Coverage: Replaces multiple antennas with a single tactical unit.
• Dual-Polarized Cross Architecture: Simultaneous vertical and horizontal signal processing.
• High-Power Handling: Rated for 300W @ 1GHz and 150W @ 3GHz for continuous-duty jamming.
• Compact 3-Meter Footprint: Loaded elements provide HF/VHF capability in a UHF-sized frame.
• Rapid Tactical Deployment: Self-locking, foldable design for <10 minute setup times.
• Strategic Center-Mount Design: Optimized for stability and balanced load on tactical masts.
• Marine Grade 316 Stainless: Total corrosion resistance for the most severe environments.
• Direct Ground Protection: Integrated lightning protection and enhanced noise immunity.

Tactical Guide: Optimizing Multi-Band Success

1. Non-Metallic Mast Requirement

Because the LPDP-20-3000L is a center-mount antenna, the presence of a metallic mast directly through the center of the elements would degrade the radiation pattern and VSWR.

• Recommendation: Use a heavy-duty fiberglass mast (at least 6 feet/1.8 meters) to elevate the antenna above the metallic portion of the tower. This ensures the 110-degree beamwidth remains undistorted across all bands.

2. Handling Polarization Rotation

In the 20-3000 MHz range, signals behave differently. Lower frequencies wrap around buildings, while higher frequencies (S-Band) reflect like light.

• The Solution: By monitoring both ports, the LPDP-20-3000L ensures that no matter how the signal rotates, it is captured by either the vertical or horizontal elements, preventing "signal dropouts."

3. High-Power "Floodlight" Jamming

With its wide 110-degree horizontal beam, this antenna acts as a massive RF floodlight. It allows the operator to sweep the entire tactical spectrum for threats and immediately suppress them without the need for precise mechanical re-alignment.

EW & Monitoring Guide: 20–3000 MHz Spectrum Dominance

The LPDP-20-3000L is a strategic "all-in-one" solution for the modern electronic battlefield. Operating from 20 MHz to 3 GHz, it covers everything from legacy tactical HF/VHF to modern 4G/5G, Wi-Fi, and S-Band satellite links. In this massive frequency range, signals interact with the environment in vastly different ways, making the antenna's dual-polarization a critical tactical requirement.

1. Defeating Signal Fading & Polarization Rotation

At the lower end (20–100 MHz), signals "wrap" around obstacles (diffraction). At the higher end (1–3 GHz), they reflect off surfaces like light off a mirror (multipath). Both behaviors cause the signal's polarization to rotate.

• The "Null" Problem: A standard vertical monitoring antenna will experience a signal "null" or dropout of up to 20–30 dB if a target's signal rotates horizontally after hitting a building or traveling through the ionosphere.
• The Tactical Solution: By utilizing both the Vertical and Horizontal ports of the LPDP-20-3000L, your receiver captures both components of the wave simultaneously. This ensures you never lose a critical voice transmission or high-speed data burst, regardless of how the signal has bounced.

2. Tactical "Look-Through" & Wideband Detection

Because this antenna uses loading to reduce its size to 3 meters, it remains mobile while providing a "tripwire" across the entire spectrum.

• Detection vs. Reception: It identifies the presence of tactical low-band nets (like SINCGARS) and high-band data links (S-Band) simultaneously.
• Maintenance-Free Passive Design: Unlike active antennas that can saturate or fail in high-RF environments, the LPDP-20-3000L is fully passive. It can monitor weak signals while nearby high-power transmitters are active without "blinding" the internal circuitry.

3. Polarization "Fingerprinting" for Source ID

The dual-polarized cross-elements allow an operator to identify the type of transmitter based on its RF signature:

• Vertical Dominance: Confirms standard mobile tactical units, handheld "walkie-talkies," or maritime VHF.
• Horizontal/Mixed Dominance: Often identifies fixed-site point-to-point relays, TV/broadcast backup links, or signals arriving via Ionospheric Refraction (Skip).

4. High-Power "Floodlight" Jamming (ECM)

Despite its compact size, the antenna handles 300 Watts @ 1GHz.

• 110-Degree Wide-Angle Search: The wide horizontal beamwidth allows you to sweep a large sector for signals without needing to point the antenna with surgical precision.
• Operator Safety: The 14 dB Front-to-Back ratio is critical. It ensures the majority of the energy is projected toward the target, protecting the SIGINT team and their sensitive receivers located behind the antenna mast.

Tactical Deployment Checklist

• Non-Metallic Mast (Critical): Since this is a center-mount antenna, you must use at least 6 feet (1.8m) of heavy-duty fiberglass mast. A metal mast passing through the elements will cause massive VSWR spikes and destroy the radiation pattern.
• Phase-Matched Feeders: Use identical lengths of LMR-600 for both ports. Even a small difference in cable length at 3 GHz causes phase shifts that degrade your ability to combine the V and H signals.
• Grounding & Noise Floor: Connect the direct ground terminal to a copper ground stake. This bleeds off "P-static" (precipitation static) that builds up during wind or rain, which can otherwise drown out weak signals at the 2–3 GHz range.
• Connector Sealing: At 3 GHz, moisture is the enemy. Use professional-grade butyl rubber tape and UV-rated electrical tape to seal the N-Female connectors. A single drop of water will ruin the VSWR.