1. The Package Uses A Bandpass Filter, 3355 High Level, Ne602 Mixer, Mc1350 And Other Programs In Place To Receive 118-136mhz Am Signal. 2.Directly On The Pcb Inductor Alignment, Greatly Simplify The Assembly Difficulty, After Welding, Only One Week To Adjust The Device. 3.The Circuit Board Has To Listen To The Circuit To Comfort, While Avoiding Long Time Mute Noise. Kit Welding Requires Some Electronic Technology, Please Bring Your Own Multimeter And Soldering Iron And Other Tools, Manuals And So On. Dedicated To Receiving Calls Between The Aircraft And The Tower, With Good Performance Antenna (Vhf Band), In About 190km Range Can Be Accepted To Open The Maximum Of Various Types Of Airplanes And The Tower Between The Call. 4.12v Power Supply, Pcb Board Size Is 9.2 x 7.5cm, Can Be Placed In 97 x 40 x 120mm Aluminum Chassis To Use. 5. Tips:As The Vhf Band Has A Similar Propagation ---- Linear Propagation Of Light, But The Receiving Location Up To The Airport, The Distance ( 25km'S) Must Be Installed Vhf Antenna And Other High Line-Band Gain Antenna; Receiving Location In The Airport Between The -Scale Obstacles (Including, But Not Limited To, High-Rise Buildings, High Mountains, High Towers) Around The Obstacles Are Always Different batches may have differences in product appearance, color, and characters, which will not affect the use Can Receive:118-136mhz Programs In Place:MC1350 Mixer:NE602 Within Approximately:190km Colour:As Shown Material:PCB Package Contents: 1 Set x Aviation Kit 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.