1. The circuit is simple. It is only composed of common triodes and resistance-capacitance inductive components, without audio , which is easy to make; 2. The sound quality is good. Within the rated transmission distance, the sound quality is close to that of FM broadcasting, and the signal-to-noise ratio is good. 3. There is no need for an external antenna (tens of meters for medium wave), and the magnetic field leaked by the magnetic rod affects the receiver, which is easy to implement and the transmission distance is relatively short; 4. There are many interfaces, designed with waveform test terminals, audio sockets, external power sockets, etc., which are easy to use and expand functions; 5. It can be connected to an external power supply or installed with battery(4 AA alkaline batteries,excluding batteries) for use. AMT-MW207 medium wave transmitter is a simple AM signal source suitable for amateur electronics enthusiasts and radio enthusiasts. It uses a magnetic rod to transmit electromagnetic waves without an external antenna. It can be used to test ordinary medium wave radios where the radio signal is insufficient. As well as ore radios, it can also be used as an instrument for debugging medium wave radios. [Main features of finished product] 1. Frequency range: 525~1605kHz 2. Power supply voltage: 6V 3. Circuit board size: 78mmx85mm (length x width) 4. Transmission distance: about 1 meter for superheterodyne medium wave radios, about 0.5 meters for direct and ore radios [description] 1. This kit adopts full discrete circuit, which is especially suitable for students to learn the working principle, practice production and test; 2. The variable capacitor uses a double-connected variable capacitor, and the two-connection parallel connection can obtain sufficient ; Colour:White Material:PCB+plastic+metal Package Contents: 1 x AMT-MW207 525-1605kHz MW medium wave transmitter AM radio transmitter 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.