LPDP-1200-1600

The LPDP-1200-1600 is an elite-performance Dual Polarized Cross-Element Log Periodic Dipole Antenna specifically engineered for the 1200–1600 MHz L-Band spectrum. Delivering a formidable 11 dBi gain in a compact 450mm frame, this antenna is a precision instrument for GPS/GNSS signal monitoring, L-Band satellite communications, and tactical jamming. By integrating simultaneous horizontal and vertical signal processing with cross-polarized elements, it ensures maximum signal intercept and high-power transmission density for mission-critical electronic warfare (EW) and SIGINT operations.

Design: Precision L-Band Engineering

The LPDP-1200-1600 is optimized for the narrow but high-value L-Band range, where signal accuracy and directional power are paramount.

• Elite 11 dBi Gain: By utilizing a full-sized, non-loaded array design, the antenna achieves a high gain and a focused 50-degree beamwidth. This allows for extreme precision in signal targeting and long-range reception.
• Simultaneous E & H Capture: Equipped with 2 x N-Female ports, the antenna processes vertical and horizontal polarizations at once. This provides 25 dB of Cross-Polarization Discrimination, allowing operators to isolate or combine signals with surgical precision.
• Compact All-Welded Integrity: At only 450 mm (20 inches) in length, the antenna is small but exceptionally rugged. All elements are welded directly to the booms to prevent vibration-induced RF inter-modulation.

Construction: Combat-Ready Hardening

Constructed from 6063T6 architectural anodized aluminum alloy, the LPDP-1200-1600 is built for rapid installation and long-term environmental survival.

• Rear-End Master Mounting: The mounting hardware is permanently welded at the back end of the boom. This "rear-mount" design ensures the antenna can be attached to a standard 52mm (2-inch) metal mast without the mast interfering with the radiation pattern or gain.
• Integrated D.C. Grounding: The system operates at D.C. ground, providing a low-resistance discharge path for lightning and suppressing static noise for a high-sensitivity "quiet" noise floor.
• Marine-Grade 316 Hardware: All fasteners are made of Type 316 stainless steel, and the entire unit is epoxy-powder coated for total protection against salt spray and acid rain.

Reliability: 250W Continuous-Duty Power

With a 250 Watt power capacity, the LPDP-1200-1600 is a robust radiator for S-Band/L-Band jamming and data links. The 17 dB Front-to-Back ratio focuses the energy forward while providing a deep "null" behind the antenna to protect sensitive receivers and personnel on-site.

Technical Features

• High-Gain Cross-Element Architecture: 11 dBi gain for superior directional focus.
• Simultaneous Dual Polarization: 2 x N-Female ports for total signal control.
• Precision 1200–1600 MHz Bandwidth: Ideal for GPS (L1, L2, L5) and L-Band SATCOM.
• 250W High-Power Handling: Optimized for electronic countermeasures (ECM).
• Compact 450mm Logistics: Lightweight (3 Kgs) for easy mobile or rooftop deployment.
• 25 dB Isolation: Elite cross-polarization discrimination for SIGINT fingerprinting.
• Welded Durability: Resists high-vibration environments and 200 Km/Hr winds.
• Marine Grade 316 Fasteners: Superior corrosion resistance for coastal operations.

Integration Guide: Maximizing L-Band Intercepts

1. GNSS & GPS Monitoring

The 1200-1600 MHz range is the primary home of global navigation satellite systems. Because satellite signals are circularly polarized and rotate as they pass through the ionosphere, a single-polarized antenna will lose 3 dB of gain instantly.

• The Solution: Use both ports of the LPDP-1200-1600 to capture the full signal energy, ensuring the most accurate timing and positioning data intercepts.

2. Tactical Jamming Precision

At 250 Watts, the focused 50-degree beamwidth acts as a surgical RF "scalpel." This allows you to suppress a specific target link at a distance without causing collateral interference to nearby friendly frequencies outside the 50-degree window.

3. Coaxial Cable Selection

At 1600 MHz (1.6 GHz), cable loss is significant.

• Recommendation: Use low-loss cables like LMR-400 for runs over 10 meters. Ensure all connections are weather-sealed with butyl tape; at these frequencies, even minor moisture ingress can cause a massive VSWR spike.

Strategic EW & SIGINT Guide: L-Band Precision & GPS Dominance

The LPDP-1200-1600 is a surgical instrument for the 1200–1600 MHz spectrum. This range is the operational home for Global Navigation Satellite Systems (GNSS) including GPS (L1, L2, L5), GLONASS, and Galileo, as well as critical L-Band tactical data links. In this high-frequency environment, signal precision and polarization agility are the difference between a successful intercept and a missed target.

1. Capturing Rotating Satellite Signals (GNSS/GPS)

Satellite signals are transmitted with Circular Polarization (CP) to help them survive the trip through the Earth's ionosphere. However, as they descend, atmospheric conditions and urban "canyons" cause the signal to shift and rotate.

• The "3 dB Loss" Problem: Using a single-polarized antenna to receive a circularly polarized satellite signal results in an immediate, permanent 3 dB loss of signal strength.
• The Dual-Polarized Solution: By capturing both the Vertical and Horizontal components simultaneously, the LPDP-1200-1600 allows your receiver to reconstruct the full wave. This maximizes the Signal-to-Noise Ratio (SNR), which is vital for decyphering weak GPS/GNSS timing and positioning data.

2. Defeating L-Band Multipath in Urban Environments

At 1.2–1.6 GHz, radio waves behave like light; they reflect sharply off glass, metal, and concrete. Each reflection can flip the polarization of the signal.

• The Tactical Advantage: In an urban SIGINT operation, a target’s signal may arrive at your mast after three or four bounces, arriving almost entirely horizontally polarized even if it started vertically. The LPDP-1200-1600’s cross-elements ensure you capture that reflected energy without "nulls," maintaining a lock on the target even in dense city centers.

3. Surgical Jamming & 25 dB Isolation

The 50-degree horizontal beamwidth and 25 dB Cross-Polarization Discrimination make this antenna a formidable Electronic Countermeasure (ECM) tool.

• Precision Targeting: The narrow beam acts as an RF "scalpel." You can flood a specific L-Band link with 250W of jamming power while minimizing "spillover" interference to friendly systems located just outside that 50-degree window.
• High-Isolation Monitoring: The 25 dB isolation allows an operator to jam on one polarization (e.g., Vertical) while simultaneously "looking through" the horizontal port to monitor the environment or verify jamming effectiveness with minimal self-interference.

4. Front-to-Back Protection for Sensitive Sites

In L-Band operations, receivers are often highly sensitive to avoid missing weak data bursts.

• The 17 dB Shield: The LPDP-1200-1600 projects 17 dB less energy out of the back than the front. This deep "null" behind the antenna is essential for protecting the SIGINT team’s own GPS-disciplined clocks and sensitive receivers from being "blinded" by their own high-power jamming or transmission.

Tactical L-Band Deployment Checklist

• Microwave-Grade Cabling: At 1600 MHz, standard coax is insufficient. Use LMR-400 or LMR-600 with high-quality N-Type connectors. Ensure the cables for both the V and H ports are phase-matched (identical in length) to allow for accurate signal combining at the receiver.
• Rigid Mast Mounting: Because the beamwidth is a narrow 50 degrees, even a slight "sway" in the mast can move your peak gain off the target. Use a rigid 52mm (2-inch) steel or reinforced aluminum mast and ensure the welded rear-mount is tightened to spec.
• Weather-Sealing (L-Band Critical): High-frequency connectors are extremely sensitive to moisture. Use butyl rubber tape to create a "cold shrink" seal over the N-Female terminations. A single drop of water in the connector will cause a massive VSWR spike at 1.6 GHz.
• Direct Grounding: Ensure the antenna’s D.C. ground path is connected to a localized earth stake. This bleeds off the "static crackle" that builds up in dry or windy conditions, which can otherwise raise the noise floor and hide weak L-Band satellite signals.