## ALTG-U34-R: Electronic Specifications and Components The **ALTG-U34-R** is a high-performance, industrial-grade GNSS (Global Navigation Satellite System) antenna, specifically a **Ruggedized Active L1/L5 Multi-GNSS Antenna**. It is designed for precision timing, autonomous vehicle navigation, and high-interference environments. Below is the breakdown of its electronic characteristics and internal architecture. --- ### 1. Frequency Band Support The "U34" designation typically refers to its ability to cover multiple high-precision bands. Its primary electronic function is to capture signals from both legacy and modernized satellite constellations. | Band | Constellation Support | Frequency Range | | :--- | :--- | :--- | | **L1 / E1 / B1 / G1** | GPS, Galileo, BeiDou, GLONASS | 1559 – 1606 MHz | | **L5 / E5a / B2a** | GPS, Galileo, BeiDou | 1164 – 1189 MHz | --- ### 2. Active Electronic Components As an **active** antenna, the ALTG-U34-R contains internal circuitry to amplify weak satellite signals before they reach the receiver. * **Low Noise Amplifier (LNA):** * **Gain:** Typically provides ~30dB to ~40dB of gain. * **Noise Figure:** Extremely low (usually <2.0 dB) to ensure signal integrity. * **SAW Filters (Surface Acoustic Wave):** * Incorporates multi-stage filtering to reject "out-of-band" interference, such as 4G/5G cellular signals and Iridium satellite transmissions. * **Voltage Regulator:** * Designed to operate on a wide DC input range (typically **3.0V to 12V DC**). * Power is delivered via the center conductor of the RF coaxial cable (Phantom Power). --- ### 3. Technical Specifications Table | Parameter | Specification | | :--- | :--- | | **Polarization** | Right Hand Circularly Polarized (RHCP) | | **Axial Ratio** | < 3 dB (at Zenith) | | **Output Impedance** | 50 Ohms | | **VSWR** | < 2.0:1 | | **Current Consumption** | ~25mA to 45mA | | **ESD Protection** | 15kV air discharge | --- ### 4. Physical Interface & Durability The electronic components are housed in a specialized enclosure to ensure stability under electrical stress. * **Connector Type:** Usually equipped with a **TNC Female** or **N-Type** connector, chosen for its low RF loss and secure mechanical coupling. * **Lightning Protection:** The internal circuitry often includes a DC-grounded design to protect the connected receiver from atmospheric static and surges. * **Radome Material:** High-dielectric polymer that allows RF signals to pass with minimal attenuation while protecting the PCB from UV and chemicals. ---