1. Connect The Radio-ATU Antenna Tuner-Antenna 2. When Using 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. 3.Set Radio Mode, Use Fm Mode. 4. Select The Antenna Band To Be Used, Use 20-30W Power In Fm Mode, Press Radio Ppt, Observe The Atu Antenna Tuner Pwr And SWR 5. Use Of The Atu Button Tune: Short Press (Less Than 1 Second) The Atu Button In The Reset State, Long Press (More Than 1 Second) The Atu Button In The Adjustment State. If The Swr Display Of The Atu Antenna Tuner Is 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 3.0 After Tuning, Detune The Antenna. Seriously, It Is Not Recommended To Use More Than 30W Power, And The Transmit Power Should Be Controlled Below 30W; If The Tuning Is Completed, The SWR Shows Less Than 2.0, And The Maximum Power Of 100W Can Be Used For Transmission Description: 1. Name: Fully Automatic Tuner 2. The Display Is 0.96 Inches Oled 3. Working Frequency: 1.8-55 MHZ 4. Built-In 3.6v Lithium Battery 1350mA 5. Usb Charging Current: 1A 6. Maximum Working Power: 100W 7. Maximum Possible Measured Power: 150W 8.1 W: Necessary To Start Setting The Minimum Power 9. Minimum Possible Measured Power: 0, 1W 10.Measurement Steps With Power Up To 10w: 0, 1W 11. Time-Power Measurement Steps And Above 10W: 1W 12. Power Measurement Accuracy: 10% 13. Maximum Specified Inductance: 8,4 UH Capacitance 14. Minimum Installation Step Size Of Inductor: 0.05H 15. Maximum Installed Capacity: 1870 PFCapacitor 16. Minimum Installation Step Size: 10 Material: ABS colour: As Shown Package Contents: 1 x Antenna Tuner 1 x Data Cable Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use 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.