Features 1.SIMPLE CIRCUIT: Radio medium wave transmitter is composed of common transistors and capacitive sense components, and uses sound transformer modulation, and can work normally without welding error. 2.GOOD SIGNAL TO NOISE RATIO: 530?1600KHz radio medium wave transmitter has been experimented in the rated transmitting distance sound quality close to FM broadcasting, signal to noise ratio is good. 3.NO EXTERNAL ANTENNA REQUIRED: Radio experimental medium wave transmitter without external antenna, rely entirely on the magnetic bar leakage of the magnetic field radio transmission to the radio. 4.EASY TO USE: Multi interface external power supply, battery, sound input, test terminal, easy to use and expand the function, can use battery power supply, can also use external power supply. 5.SIMPLE COMMISSIONING: Resistor parameters and matching transistor parameters have been matched, as long as all the components are properly welded, you can work well, only need to adjust the band coverage. specificationItem Type: Radio Medium Wave Transmitter_x000D_ Material: PCB_x000D_ Transmitting Distance: About 1m / 3.3ft For Super Aberrant CW Radio, About 0.5m / 1.6ft For Direct Discharge CW Radio_x000D_ Working Voltage: 9V_x000D_ Transmitting Frequency: 530-1600KHz PackageList1 x_x000D_ _x000D_ RadioMediumWaveTransmitter 1 x Sound Cable 1 x Screw Bag 1 x Instruction Manual