DescriptionFeatures:100% brand new and high quality Connect the radio-ATU antenna tuner-antenna If the SWR of the ATU antenna tuner shows greater than 2.0 in the transmission state, it means that the antenna has been detuned. You need to use an antenna tuner. Press and hold the ATU button TUNE to tune and observe the SWR value. If the SWR is greater than 3.0 after tuning, the antenna will be detuned. Seriously, it is not recommended to use a power above 30W, and the transmission power should be controlled below 30W; if the tuning is completed, the SWR display is less than 2.0, and the maximum power of 100W can be used for transmission Select the antenna frequency band to be used, use 20-30W power in FM mode, press the radio PPT, observe the ATU antenna tuner PWR and SWR Set radio mode, use FM mode The use of ATU button TUNE: Short press (less than 1 second) ATU button, it is in reset state, long press (more than 1 second) ATU button is in adjustment state When using it for the first time, please set the output power of the radio or power amplifier between 20-30W, warning that high-power tuning may easily damage the antenna tuner. Package Includes:1PcxAntenna Tuner1PcxWire Specifications:Material:MetalMaximum working power: 100 wattsMaximum possible measured power: 150 watts1 watt: It is necessary to start setting the minimum powerThe smallest possible measured power: 0,1 wattsMeasurement procedure with power up to 10W: 0, 1 wattHourly powerful measurement steps 10 watts above STI: 1 wattPower measurement accuracy: 10%Specified maximum inductance: 8,4 uH capacityMinimum installation step length of inductance: 0.05HMaximum installation capacity: 1870 pF capacitorMinimum installation step length: 10 note:1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.