... environment6Metal shell, good shielding performance, providing frequency passage7Providing many MODEM communication protocols8To adapt different user structure, we can develop various ... phase-lock loop, double VCO structure, high stability10Providing many MODEM communication protocols Specification: Transmitter System IndicatorsFrequency400-470MHzRF Power5WVoltageDC12VCurrent≤1.5ARate1200 ...