The **ALTG-311-R** is a high-performance, ultra-compact GPS/GNSS receiver module. It is primarily designed for integration into small-scale electronic systems like IoT devices, drones, and portable tracking hardware. --- ### 1. Key Technical Specifications The following table summarizes the core electronic characteristics of the ALTG-311-R: | Feature | Specification | | :--- | :--- | | **Chipset** | High-sensitivity GNSS Engine | | **Supported Systems** | GPS, QZSS (often GLONASS/Galileo compatible) | | **Form Factor** | SMD (Surface Mount Device) | | **Input Voltage** | 3.3V DC (Typical) | | **Power Consumption** | ~30mA (Acquisition), ~25mA (Tracking) | | **Sensitivity** | -165 dBm (Tracking) | | **Interface** | UART (TTL Level) | --- ### 2. Major Electronic Components & Subsystems The module functions through several critical internal components: #### A. The GNSS Processor The "brain" of the module. It performs the complex mathematical calculations (trilateration) required to convert raw satellite signals into latitude, longitude, and altitude data. #### B. Low Noise Amplifier (LNA) Because satellite signals are extremely weak by the time they reach Earth, the ALTG-311-R includes an integrated LNA. This component boosts the signal strength while minimizing added background noise. #### C. SAW Filter (Surface Acoustic Wave) This acts as a gatekeeper. It filters out electromagnetic interference (EMI) from nearby cellular signals or Wi-Fi, ensuring only the specific GNSS frequencies reach the processor. #### D. TCXO (Temperature Compensated Crystal Oscillator) To maintain a stable "lock" on satellites, the module needs a highly precise clock. The TCXO ensures the timing remains accurate even if the device heats up during operation. --- ### 3. Connection Pinout (Typical UART) For developers integrating this into a PCB, the electronic interface usually follows this logic: * **VCC:** Main power supply. * **GND:** System ground. * **TX:** Transmits NMEA data (location strings) to the microcontroller. * **RX:** Receives configuration commands from the microcontroller. * **PPS:** Pulse Per Second output for high-precision timing applications. --- ### 4. Implementation Requirements To ensure the electronic parts function correctly, the following are required: 1. **Antenna:** Must be connected to an active or passive 1575.42 MHz antenna. 2. **Decoupling Capacitors:** Small capacitors (usually 0.1µF and 10µF) should be placed near the VCC pin to filter power noise. 3. **Level Shifting:** If using a 5V microcontroller (like an Arduino Uno), a logic level shifter is needed to protect the 3.3V UART pins.