Alpha 4ACompact Active Single-Band GPS L1 Adhesive Antenna

The Alpha 4A is a compact, waterproof, self-adhesive GPS antenna designed for reliable L1-band performance. Delivering strong RHCP gain of 27.6 dBiC at zenith, the Alpha 4A also maintains excellent top-hemisphere uniformity with consistent performance across 90° and 120° angular sectors from zenith.

This gain stability ensures dependable satellite visibility and reduced fix times in outdoor environments. The integrated low-noise amplifier (26 ± 2 dB) enhances weak signals, providing a reliable performance for vehicle tracking, fleet management, asset monitoring, and GNSS timing systems.

Supplied as standard with SMA Male connectors and 1 m or 5 m RG174 cable.
Alternative cable lengths and connector types can be specified for high-volume projects.

Key Features

• Supports GPS L1, Galileo E1, BeiDou B1C, and QZSS L1
• High RHCP gain up to 27.6 dBiC
• Consistent coverage across ±90° and ±120° from zenith
• Low VSWR (1.15 typical) with excellent return loss (−23 dB)
• Integrated 26 ± 2 dB LNA with ≤ 1.3 dB noise figure
• Compact IP67 waterproof design with adhesive or optional magnetic mount

Electrical Specifications

• Frequency Bands: GPS L1 (1575.42 MHz), Galileo E1, BeiDou B1C, QZSS L1
• Impedance: 50 Ohm
• Polarisation: RHCP
• VSWR: <1.5
• LNA Gain: 26 dB +/-2 dB
• Noise Figure: <1.3
• Filter Insertion Loss: <3 dB
• Supply Voltage: 2.5 – 5 V DC
• Current Consumption: 10 – 26 mA

Mechanical Specifications

• Operational Temperature Range: −40 °C to +85 °C
• Storage Temperature Range: −40 °C to +85 °C
• Relative Humidity: Up to 95%
• Ingress Protection: IP67

Mechanical Specifications

• Dimensions: L38 x W34 x H13 mm
• Weight: 33 g
• Cable: RG174
• Connector: SMA Male
• Material: ABS
• Mounting method: Adhesive (Magnetic Mount available for volume orders)

Datasheets

Additional Resources