Features: This 1-1050MHz RF Linear Power Amplifier signal amplification, delivering up to 3.5W output power, for DTMB broadcast transmission. Features a wide frequency ranging of 1-1050MHz, operates on 12-18V, ensuring performances in highly linear operation. RF Linear Power Amplifier (1-1050MHz, 3.5W) for DTMB transmissions LED Power supply power indication Note: When installing, use the case and other metal close contact for auxiliary heat dissipation. Suitable for electronic engineers, communication engineers, radio enthusiasts and other professionl for radio broadcasting station, communication base, and other fields Specifications: Operating frequency: 1-1050MHz 2) Operating voltages: 12-18V Working current: 400-600mA Output power: 3W (typical), tp3.5W Overal Size: about 103x105x33mm/4.06x4.13x1.3in Connection method RFin: Signal input RFout: Signal output (signal output after amplification) VCC: Positive power supply GND: Negative power supply Package Includes: 1PC Signal Amplification note: Please allow 1-2cm errors due to manual measurement,please make sure that do not mind before order. Due to difference between different monitors, the picture may not reflect the actual color the item.