Radio experimental medium wave transmitter, school training kit AM transmitter DIY transmitter set reminder: 1. This motherboard is only for the use of medium wave wireless lovers, which can well test the effect of mineral radio. 2. Loose parts: including the existing components and audio cables on the main board, and the frequency points need to be adjusted by yourself. Finished board: available when powered on, including audio cable. Electrical parameters: Power supply: 9V2A DC, 5.5 interface, internal positive and external negative (self-prepared power supply is required) Transmission frequency: 530~1600KHZ (radio medium wave band) High-frequency transmission power: adjustable 20 milliwatts to 500 milliwatts, adjustable power within 5 to 10 meters. Antenna: 1.5~2.5 copper wire for 5m home Audio input: 3.5mm at both ends, attached to the board Audio source: CD, desktop computer, mobile phone, etc Applicable to: medium wave radio enthusiasts, for students to study the principle of wireless signal generation and AM transmitter audio modulation. Packing:1PC Condition: 100% Brand New