LPDS-200-500

The LPDS-200-500 is an elite, military-grade High Gain Dual Stacked Log Periodic Dipole Antenna system specifically engineered for the 200–500 MHz spectrum. By utilizing a side-by-side horizontal stacking configuration, this system achieves a massive 14 dBi gain and a razor-sharp 26-degree horizontal beamwidth. This makes it the definitive solution for high-precision Ground-to-Air UHF Air Traffic Control (ATC), long-range tactical intercepts, and high-intensity jamming. Built from 6063T6 architectural aluminum, the system is designed to provide unprecedented directional dominance in the most severe environmental conditions.

Design: Double the Aperture, Double the Performance

The LPDS-200-500 is engineered for operators who require the highest possible gain and front-to-back isolation in the UHF band.

• Stacking Advantage: By combining two LPDA units with a specialized power splitter/combiner and phasing harness, the system narrows the horizontal beam to a surgical 26 degrees. This results in a 14 dBi gain, essentially quadrupling the effective power density compared to a single-bay antenna.
• Precision Beam Steering: The tight beamwidth allows for exceptional spatial filtering, enabling operators to "lock onto" a specific aircraft or signal source while completely ignoring interference from neighboring channels or reflective obstacles.
• Rapid Tactical Logistics: Despite its dual-array complexity, the system is designed for mobility. The foldable/removable elements and segmented booms allow for full assembly in less than 10 minutes by a tactical team.

Construction: Industrial & Marine Hardening

Constructed from 6063T6 architectural anodized aluminum alloy, the LPDS-200-500 is built for a 20+ year service life in active combat zones.

• MIL-STD-810G Certified: Rigorously tested for extreme temperature (-40 to +80°C), shock, vibration, and salt fog. It is specifically engineered to thrive in coastal, monsoon, or desert environments.
• Marine-Grade Hardening: All fasteners and mounting hardware are made of Type 316 marine-grade stainless steel. The entire array is protected by an electrostatic Epoxy Powder Coating for total corrosion resistance.
• D.C. Grounded Safety: Operates at D.C. ground, providing a low-resistance path for lightning and suppressing atmospheric static to ensure an ultra-quiet noise floor for high-sensitivity surveillance.

Technical Features

• Elite 14 dBi High Gain: Surgical directional precision for ultra-long-range intercepts.
• Narrow 26° Horizontal Beamwidth: Eliminates co-channel interference in congested UHF bands.
• 1.5KW High Power Optional: Sustains high-intensity Electronic Countermeasures (ECM).
• Complete Stacking Kit: Includes phasing harness, power splitter, and horizontal stacking poles.
• Fast 10-Minute Assembly: Optimized for rapid-deployment mobile and tactical missions.
• Center-Mast Mounting: Securely fits 52mm to 75mm (2-3 inch) heavy-duty masts.
• Anti-Corrosion Finish: Olive Green epoxy coating for tactical low-visibility and salt protection.

Integration Guide: Mastering the UHF ATC Band

1. Precision Ground-to-Air Targeting

In Ground-to-Air communications, maintaining a stable link with aircraft at extreme distances or high altitudes requires high gain and minimal side-lobe interference.

• The Stacked Benefit: The 26-degree beamwidth acts as an RF "telescope," focusing energy toward the flight corridor and providing a 20 dB Front-to-Back ratio to prevent self-interference from on-site equipment.

2. Tactical Jamming & J/S Ratio Optimization

When projecting 1.5KW of power, the high gain of the dual-stacked system exponentially increases your Effective Radiated Power (ERP). This allows an operator to successfully "drown out" an adversary's command link while using significantly less raw transmitter power than an omnidirectional or single-LPDA setup.

3. Polarization Agility

While ATC links are typically vertical, reflections in mountain terrain can rotate signals. The LPDS-200-500 mounting arrangement permits quick changes between Vertical and Horizontal polarization, ensuring you can match the orientation of the target signal to maintain a high-fidelity link.

Strategic EW & SIGINT Guide: LPDS-200-500 High-Gain UHF Dominance

The LPDS-200-500 is a surgical strike tool for the 200–500 MHz spectrum. By stacking two high-performance log periodic antennas, this system transforms a wideband signal into a high-intensity directional beam. This configuration is essential for dominating UHF Military Air-to-Ground (ATC) bands, SATCOM downlinks, and tactical data nets where the environment is often crowded with competing signals.

1. The Physics of Stacking: 14 dBi Precision

In standard Electronic Warfare, a single antenna provides a broad "floodlight" of coverage. The LPDS-200-500 uses Horizontal Stacking to create an RF "searchlight."

• Beam Compression: By placing two antennas side-by-side and feeding them in-phase, the horizontal beamwidth is compressed to a razor-sharp 26 degrees. This results in a 14 dBi gain, allowing an operator to project four times the effective power (ERP) toward a target compared to a single-bay antenna.
• Spatial Filtering: The narrow 26-degree beam allows you to "isolate" a specific aircraft or ground station in a high-density environment, physically "nulling out" interference from nearby transmitters that are only a few degrees off-boresight.

2. Mastering Ground-to-Air UHF Intercepts

The 200–500 MHz range is the primary home for military aviation. Signals from high-altitude aircraft can be weak and subject to "fading" as the aircraft moves.

• High-Gain Sensitivity: The 14 dBi gain acts as a massive "ear," pulling in low-power aeronautical transmissions from hundreds of kilometers away. This provides SIGINT teams with an extended "Early Warning" window.
• Triangulation Accuracy: Because the beam is so narrow, the "bearing" of a detected signal is much more accurate. This allows for superior triangulation of mobile aerial assets when used in conjunction with a second intercept site.

3. High-Power Jamming & J/S Ratio Optimization

To successfully disrupt a target link (e.g., a 300 MHz tactical SATCOM or an ATC command link), you must achieve a superior Jamming-to-Signal (J/S) ratio at the victim’s receiver.

• 1.5KW Strategic Power: With the high-power option, the LPDS-200-500 concentrates 1,500 Watts into its tight 26-degree beam. This density allows an operator to "drown out" an adversary's link even if the enemy is using high-power, fixed-site transmitters.
• Front-to-Back Isolation: The 20 dB Front-to-Back ratio ensures that the massive power being projected forward does not "bleed" backward into your own team's sensitive SIGINT receivers or command-and-control links.

4. "Silent" Monitoring: D.C. Grounding & Noise Floor

In high-sensitivity UHF monitoring, the "Noise Floor" is the ultimate enemy. Wind moving across the 1.4-meter booms of the dual-stacked array creates Precipitation Static (P-Static).

• The Solution: The LPDS-200-500 is D.C. Grounded. It constantly bleeds off this static charge to the mast and earth. This ensures the lowest possible noise floor, allowing you to detect low-power "hidden" transmissions or frequency-hopping signals that would be buried in the static of an ungrounded system.

Tactical Deployment Checklist

• Phasing Harness Integrity: The system relies on the phasing harness cables and power splitter to ensure both antennas "fire" at the exact same time. Ensure these cables are equal in length and the connectors are torqued to spec; a timing error of just a few millimeters can distort the 26-degree beam.
• Mast Stability: At 15 Kgs and with a dual-bay wind profile, this system requires a heavy-duty, guyed mast (up to 3 inches). A swaying mast will cause the narrow 26-degree beam to "shimmer," making it difficult to maintain a lock on a distant target.
• Polarization Matching: While ATC is usually vertical, reflections in urban or mountainous areas rotate signals. The LPDS-200-500 kit allows for rapid switching between Vertical and Horizontal polarization—always match the target's peak signal strength for maximum intercept success.
• High-Power Cable Selection: When running at 1.5KW, use LMR-600 or corrugated copper feeders. Standard cables will suffer dielectric breakdown or overheat, leading to catastrophic VSWR failure.