DIY kit received successfully. There are no problems with assembly. Instruction is partly in Chinese, partly in English. After assembly, the device is immediately operational. Antenna - simple wire (~6m). The frequency range is 590-1567 KHz, there are several harmonics, as described in the instructions. Sound modulation can be adjusted qualitatively. Sounds now like an others AM-stations, not bad. It works the same way from 5 volts instead of 9, and final transistor does not get too hot in this case. Signal coverage within an ordinary apartment is good (~15 m). I haven't checked the distance more than 15 meters yet. I am satisfied with the purchase. I want to recommend seller to develop a case (housing) for device in the future. With case, it will be more convenient to use the device. Thank you :) I recommend this seller and AM transmitter!
Recieved unfinished Version.