LPDP-20-1300

The LPDP-20-1300 is a strategic-grade Dual Polarized Log Periodic Dipole Antenna (LPDA) engineered for comprehensive wideband performance across the 20–1300 MHz spectrum. Covering everything from strategic HF and tactical VHF to modern UHF and L-Band frequencies, this massive 6-meter array is a definitive solution for high-stakes electronic warfare, SIGINT, and wideband monitoring. By utilizing full-sized radiating elements without the efficiency losses of electrical loading, it delivers a consistent 7 dBi gain, ensuring elite signal intercept and transmission capabilities.

Design: Total Spectrum Dominance

The LPDP-20-1300 is designed for operations that require massive bandwidth without sacrificing signal integrity.

• True Polarization Diversity: Equipped with 2 x N-Female input ports, the antenna eliminates "polarization fading" by concurrently processing vertical and horizontal signal components. This is vital for intercepting tactical radios in complex terrain where signals may rotate significantly.
• Unloaded Efficiency: To maintain peak radiation efficiency, the LPDP-20-1300 uses full-sized radiating elements (the longest being 3.75 meters). This avoids the heat and power loss common in size-reducing loading techniques, ensuring a consistent 7 dBi gain across 95% of the 20-1300 MHz band.
• Balanced Strategic Mounting: Given its 85 kg weight and 7.5-meter wingspan, the antenna features a center-mount arrangement for secure installation on heavy-duty masts up to 102mm (4 inches).

Construction: Industrial Hardening & Logistics

Constructed from 6063T6 architectural anodized aluminum alloy, the LPDP-20-1300 is built for strategic longevity and tactical field setup.

• Foldable Tactical Elements: Elements are supplied in two segments to facilitate manageable shipping. Despite its 6-meter (20-foot) length, two operators can assemble the array within 10 minutes using simple hand tools.
• Military-Grade Durability: The entire structure is finished with a protective powder coating. All hardware, including screws and bolts, is made from Type 316 marine-grade stainless steel, ensuring zero corrosion in salt-fog or high-humidity zones.
• Direct Ground Protection: The system operates at D.C. ground, providing a low-resistance path for lightning and suppressing atmospheric static, resulting in an ultra-quiet noise floor for sensitive surveillance.

Reliability: 500W Multi-Mission Power

With a 500 Watt power handling capacity, the LPDP-20-1300 is robust enough for continuous-duty strategic jamming and backbone data links. The 100-degree horizontal beamwidth acts as a powerful directional floodlight, while the 14 dB Front-to-Back ratio ensures that the operator’s site remains shielded from the high-power RF energy being projected at the target.

Technical Features

• Dual-Polarized Cross-Element Architecture: Simultaneous vertical and horizontal signal processing.
• Massive 20–1300 MHz Bandwidth: Covers Strategic HF, Tactical VHF, Military UHF, and L-Band in one unit.
• High-Power 500W Rating: Engineered for high-duty cycle electronic countermeasures (ECM).
• Strategic 6-Meter Design: Optimized for low-frequency efficiency without lossy electrical loading.
• MIL-STD-810G Certified: Tested for extreme shock, vibration, humidity, and salt fog.
• Direct Ground Protection: Integrated lightning protection and enhanced noise immunity.
• Marine Grade 316 Stainless Hardware: Total corrosion resistance for the most severe environments.
• Balanced Center Mounting: Securely fits 50mm to 102mm (2-4 inch) heavy-duty masts.

Integration Guide: Maximizing Strategic Performance

1. Defeating Urban & Forested Multipath

In complex environments, signals bounce and rotate their polarization.

• The Solution: By monitoring both ports simultaneously, the LPDP-20-1300 ensures that if a signal "fades" on the vertical plane, it is captured on the horizontal, preventing critical data loss.

2. Strategic Jamming Success

At 500 Watts, this antenna acts as a massive RF floodlight. Feeding power into both ports ensures the target radio is hit with high-intensity noise from every vector, leaving no "clean" orientation for the adversary to receive data.

3. Site Protection & F/B Ratio

In high-power operations, "Self-Jamming" is a major risk. The 14 dB Front-to-Back ratio is critical; it ensures your own team behind the antenna remains functional while you project power at the target.

Strategic EW & SIGINT Guide: Dominating the 20–1300 MHz Spectrum

The LPDP-20-1300 is a strategic "heavyweight" asset designed for the modern electronic battlefield. Operating from 20 MHz to 1.3 GHz, it covers the entire spectrum of legacy HF/VHF tactical nets, aviation links, military UHF, and L-Band data links. In this massive 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 tend to diffract or "wrap" around obstacles. At the higher end (500–1300 MHz), they reflect off surfaces like glass and concrete. Both behaviors cause Polarization Rotation.

• 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-20-1300, 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. Strategic 500W Jamming (ECM) Success

To successfully disrupt a wideband frequency-hopping network (like SINCGARS, HAVE QUICK, or modern data links), you must saturate the victim's "RF environment" completely.

• Dual-Plane Saturation: Many modern high-end radios use diversity antennas to "dodge" jammers. By feeding 500 Watts into both ports of the LPDP-20-1300, you saturate both the E (Electric) and H (Magnetic) planes. This leaves the target radio with no "clean" orientation to receive data.
• Directional Power Density: The 7 dBi gain concentrates that 500W into a 100-degree floodlight. This dramatically increases the Jamming-to-Signal (J/S) ratio compared to an omnidirectional antenna, allowing you to suppress targets at significantly greater distances.

3. Mode Identification & SIGINT "Fingerprinting"

The LPDP-20-1300 allows SIGINT operators to identify the nature of the transmitter based on its polarization signature:

• Vertical Dominance: Confirms standard mobile tactical units, maritime vessels, or ground-based infantry whips.
• Horizontal Dominance: Indicates fixed-site point-to-point relays, TV/Broadcast backup links, or specialized NVIS (Near Vertical Incidence Skywave) links used for regional communication over mountainous terrain.
• Rapid Polarization Shifting: A signal that rapidly moves between V and H ports often identifies a moving vehicle or aircraft as the signal bounces off changing terrain features.

4. Front-to-Back Isolation: Site Security

In high-power (500W) operations, "Self-Jamming" is a major risk to friendly troops.

• The 14 dB Shield: The LPDP-20-1300 radiates 14 dB less energy out of the back than the front. This allows your EW team to operate their own Command & Control (C2) equipment directly behind the antenna without being "blinded" by their own high-power jamming signal.

Strategic Deployment Checklist

• Feeder Management: Use high-quality, phase-matched LMR-600 or 1/2" corrugated cables. While loss is lower at VHF, it becomes significant at 1300 MHz. Ensure all 500W reaches the elements to maintain effective power density at the target.
• Mast Stability: Due to the 7.5-meter width and 85 kg weight, use a heavy-duty 102mm (4-inch) steel or reinforced aluminum mast. Ensure the center-mount clamp is torqued correctly to prevent "spinning" in high winds.
• Grounding for Noise Floor: Ensure the mast is grounded to a copper rod. The D.C. Grounded design of the LPDP-20-1300 is vital for bleeding off the atmospheric static that can drown out weak SIGINT signals during storms or high-wind events.
• Logistic Management: Take advantage of the 10-minute assembly feature. Even for an antenna of this scale, the foldable segments allow for relatively fast setup in a tactical forward position once the main mast is secured.