Welcome to the store! This amplifier is suitable for use in the frequency range of 125-185MHz, especially for the front-end amplifier of 144MHz receivers. It features ultra-low noise factor 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) Gain: 26dB Maximum Output Power: 100mW (20dBm) Noise Factor: 0.5dB (very small) Connector Model: SMA-K (SMA standard female, external screw inner hole) Connection 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 does not affect the use. Color: 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 to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!