The **HORNET-TX3** is a multi-channel remote control transmitter module commonly used in industrial, agricultural, and security applications. It is designed by RF Solutions and operates primarily on the FM (Frequency Modulation) bandwidth to ensure reliable range and interference immunity. --- ### Core Electronic Specifications The technical architecture of the HORNET-TX3 focuses on low power consumption and high-security transmission. | Feature | Specification | | :--- | :--- | | **Operating Frequency** | 433.92 MHz (standard) | | **Modulation** | FM (Frequency Modulation) | | **Operating Voltage** | 3V (typically powered by a CR2032 battery) | | **Transmission Range** | Up to 100-150 meters (Line of Sight) | | **Encoding Type** | Keeloq Hopping Code (High Security) | | **Channels** | 3-Button Interface | --- ### Key Electronic Components #### 1. The Microcontroller & RF IC The "brain" of the TX3 is an integrated circuit that combines a microcontroller with a radio frequency synthesizer. It handles: * **Scanning:** Monitoring button presses to wake the device from sleep mode. * **Packet Construction:** Building the data stream containing the unique device ID and command. #### 2. Keeloq™ Encryption Engine Unlike simple fixed-code remotes, the TX3 uses a **Hopping Code** algorithm. * **Function:** Every time a button is pressed, the transmitter sends a different encrypted code. * **Security:** This prevents "code grabbing" or "replay attacks" where an unauthorized person intercepts the signal to reuse it later. #### 3. PCB Antenna Instead of a protruding wire, the HORNET-TX3 usually utilizes a **Trace Antenna** etched directly onto the Printed Circuit Board. This is tuned specifically to 433MHz to maximize radiation efficiency while maintaining a compact form factor. #### 4. LED Indicator A simple diagnostic electronic part: * **Solid Flash:** Indicates a successful transmission. * **Dim/No Light:** Indicates the battery voltage has dropped below the operational threshold (usually <2.2V). --- ### Operational Flow 1. **Input:** A tactile switch (Button 1, 2, or 3) is pressed, completing a circuit. 2. **Encryption:** The internal IC generates a 66-bit transmission string using the Keeloq algorithm. 3. **Modulation:** The string is converted into FM signals. 4. **Broadcast:** The RF stage amplifies the signal and pushes it through the PCB antenna. --- ### Comparison: HORNET-TX3 vs. Standard TX | Part Component | HORNET-TX3 | Standard AM Remote | | :--- | :--- | :--- | | **Signal Stability** | High (FM) | Low (AM/ASK) | | **Encryption** | Rolling Code | Fixed Code | | **Current Draw** | ~12mA (Transmitting) | ~20mA+ |