Key benefits Seamless communication in both simplex and duplex modes: Simplex and Duplex systems use an offset of 0 to eliminate frequency offset configuration and reduce setup errors. Stable, accurate RF performance: High-precision, temperature-compensated TCXO crystals keep frequency drift and bit errors to a minimum, improving link reliability and data integrity. Easy integration and display options: Native I2C support lets you connect directly to Raspberry Pi boards and I2C OLED displays for quick status readouts, configuration, and telemetry. Versatile frequency coverage: A wide RF range supports multiple applications and regional assignments without changing hardware. What it does and why it matters Reliable links: The TCXO provides consistent carrier frequency under temperature change, which reduces retransmits and improves overall system throughput. Simplified deployment: Using an offset of 0 for both duplex and simplex simplifies configuration and reduces the chance of communication mismatches during installation or field changes. System expandability: I2C compatibility enables compact control and monitoring solutions when paired with small controllers and displays. Key attributes Function: Supports simplex and duplex operation with zero offset for consistent channel behavior. Frequency ranges: 144–148 MHz, 219–225 MHz (main band), 420–475 MHz, and 842–950 MHz. Frequency control: High-quality, temperature-compensated TCXO for low bit error rate and precise frequency stability. Interfaces: I2C communication for easy connection to Raspberry Pi, microcontrollers, and I2C OLED displays. Practical use scenarios Amateur radio and repeater linking: Use the module for reliable voice or data links across the 144–148 MHz and 420–475 MHz amateur bands where stable frequency and simple configuration matter. Remote telemetry and IoT gateways: Pair via I2C with a Raspberry Pi and an OLED to collect, display, and forward sensor data over 219–225 MHz or 842–950 MHz bands. Mobile or vehicular communications: Deploy in mobile nodes that require low drift and dependable RF performance across the supported frequency ranges. Technical highlights (concise) Duplex and Simplex systems: offset = 0 Crystal: temperature-compensated TCXO, low bit error rate Interface: I2C (compatible with Raspberry Pi and I2C OLED displays) RF frequency coverage: 144–148 MHz, 219–225 MHz (main band), 420–475 MHz, 842–950 MHz This product is designed for users who need dependable, easy-to-integrate RF modules with stable frequency performance and broad frequency flexibility.