4G15A2-XS-2 – Antcom Corporation Active L1 GPS Antenna
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Overview Section
The Antcom 4G15A2-XS-2 is a high-performance, Active L1-band GPS Antenna specifically designed for high-vibration and extreme-environment aerospace and maritime applications. As an "Active" antenna, it incorporates an internal Low Noise Amplifier (LNA) to boost the weak GPS signals received from satellites before they travel through the coaxial cable to the receiver. This ensures a high Signal-to-Noise Ratio (SNR) even with long cable runs.
The "XS" designation in the part number identifies the Extra-Small (XS) form factor, providing a low-drag, low-profile footprint ideal for unmanned aerial vehicles (UAVs), high-speed aircraft, and missiles where space and aerodynamics are critical. This antenna is engineered for the L1 frequency (1575.42 MHz), making it compatible with a wide range of standard civil and commercial GPS receivers.
Key Features Section
Integrated LNA: Features an internal amplifier (typically 20dB or 33dB gain) to compensate for cable losses and improve receiver sensitivity.
XS Low-Profile Footprint: The Extra-Small housing minimizes aerodynamic drag and allows for installation on small surfaces or curved airframes.
L1 Frequency Optimization: Tuned specifically for the 1575.42 MHz GPS frequency for maximum signal reception efficiency.
Ruggedized Construction: Built to withstand high-G shock, intense vibration, and wide temperature variations as mandated by RTCA DO-160 and MIL-STD-810.
Hemispherical Coverage: Designed for a wide beamwidth to maintain satellite lock even as the aircraft or vehicle maneuvers.
Multiple Connector Options: The "-2" dash number typically specifies a specific connector type (e.g., SMA, TNC, or N-Type) or mounting configuration.
Hermetically Sealed: The housing is environmentally sealed against moisture, salt spray, and atmospheric contaminants.
Technical Specifications Section
Part Number: 4G15A2-XS-2
Component Type: Active GPS Antenna
Frequency: 1575.42 MHz (GPS L1)
OEM Manufacturer: Antcom Corporation
Gain (LNA): Typically 33dB (Refer to specific data sheet for the -2 variant)
Noise Figure: Less than 2.0dB (nominal)
Voltage Input: 2.5V to 24V DC (Phantom power via coaxial cable)
Power Consumption: Low current draw, typically less than 40mA.
Dimensions: Extra-Small (XS) low-profile housing.
Weight: Lightweight design, typically under 4 ounces.
Governing Specifications: Compliant with RTCA DO-160G and MIL-STD-810H environmental standards.
Aircraft and Vehicle Compatibility Section
UAVs and Drones: Ideal for small tactical UAVs where weight and aerodynamic profile are the primary design constraints.
General Aviation and Business Jets: Suitable as a primary or secondary GPS source for navigation and ADS-B systems.
Tactical Missiles and Ordnance: Engineered to survive the high-G launch and flight environments of precision-guided munitions.
High-Speed Maritime Vessels: Capable of withstanding salt-fog and extreme vibration in marine navigation applications.
Note: The installation of this antenna on certified aircraft must be performed in accordance with the aircraft's Avionics Installation Manual and applicable FAA/EASA regulations regarding structural modifications and antenna spacing.
Applications Section
Precision Navigation: Providing stable L1 GPS signal for Flight Management Systems (FMS) and GPS/WAAS navigators.
ADS-B Out Synchronization: Acting as the high-integrity position source required for ADS-B Out transmissions.
Telemetry and Tracking: Reliable position reporting for flight testing and asset tracking in harsh environments.
Why Choose the 4G15A2-XS-2?
The 4G15A2-XS-2 is an essential navigation sensor component. In GPS systems, the antenna is the most vulnerable point for signal degradation. Using a non-certified or consumer-grade antenna in an aerospace environment can lead to signal masking during maneuvers or LNA failure due to vibration. The Antcom XS series is specifically designed to provide the highest possible signal gain within the smallest possible footprint. Choosing this OEM antenna guarantees the interference rejection, frequency stability, and mechanical durability required for mission-critical navigation systems.
The performance of the 4G15A2-XS-2 is defined by its Low Noise Figure and Gain. Because the GPS signal arriving from the satellite is below the thermal noise floor, the internal LNA must amplify the signal with minimal added noise. The Antcom XS design utilizes a Ceramic Patch Element combined with a high-rejection filter to prevent out-of-band interference (such as from cellular or VHF signals) from saturating the receiver. The "Phantom Power" design allows the antenna to be powered directly through the signal cable, simplifying installation by removing the need for dedicated power wiring. This makes the 4G15A2-XS-2 a highly efficient and reliable choice for modern integrated avionics suites.
Note: The 4G15A2-XS-2 is a navigation system component. Installation requires specialized coaxial cable (e.g., RG-142 or RG-400) to maintain signal integrity. Technicians should verify the DC voltage output of the GPS receiver matches the antenna's power requirements before final connection.
Documentation
Antcom Corporation 4G15A2 Series Data Sheet: Contains detailed gain curves and mounting footprints.
RTCA DO-160 / MIL-STD-810: Reference standards for the environmental testing of the antenna assembly.