This amplifier is suitable for use in the frequency range of 125-185MHz, especially for the front-end amplifier of 144MHz receiver. It has ultra-low noise figure and high RF gain, which can effectively improve the receiving sensitivity of the equipment and is very suitable for use in the front end of amateur radio receivers. Operating frequency: 125-185MHz Operating voltage: 3-5V Operating current: 65mA (typical value) Amplification gain: 26dB Maximum output: 100mW (20dBm) Noise figure: 0.5dB (very small) Connector model: SMA-K (SMA standard female, external screw inner hole) Wiring method: RFin: Input signal amplification RFout: Output amplified signal DC: Positive power supply Wire nose: Negative power supply Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:Silver Material:Metal Package Contents: 1 x Low Pass Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.