Radio Medium Transmitter AM Transmitter Adjustable 530‑1600KHZ DIY Transmitter Kit for School Experiment

Works great for broadcasting content to AM radios. The documentation is a bit confusing for English, but can be made out if studied, and know principles of am radio. It did work fine (out of the box) with no tweaking, so understanding the functions is not totally needed.

Arrived in one day. Well packaged and seemed to be quality built. I agree with others that the instructions are not good but instructional enough to be useful.Pure rf carrier sine wave was nearly perfect on the scope and the modulated signal was well defined.The board was fairly well tuned to nearly 1600 KHz. But it required a scope and frequency country to optimize it.L2 and L3 are coils which set the output filter resonance point. The ferrite material is very brittle and chipped when L3 coil was adjusted.With a short 80-centimeter telescopic antenna, the broadcast covered a large room. Good sound quality but not excellent.Great board for experimentation and there is reasonable explanation of the block diagram functions.At 9VDC, the current was about 100 mA.Wished they included knobs and screws for the tuning capacitor and potentiometers.

Item works good after a lot of trial and error adjustment without good documentation. Instructions are technical but impractical to setting up. Documentation was in Chinese and English, but very hard to understand. Instruction booklet appeared that it had been copied multiple times so some of the text was either missing or faded out. Needs to have better and more clearer instructions guided toward the enthusiast for pain free setup.The audio cable did not work. I decided to keep it without going through the exchange process as it took a very long time from order to receipt of the item.

Please note , this is not a kit , comes assembled , complete with 3.5mm ( male to male ) audio cable to plug into an audio source you want to broadcast on AM band radio , the transmitter is Pre set to the high end of the AM band , near 1580khz ( mine was here ) Just tune a portable receiver near it , youll know when your signal is louder than anything else , I measured the RF output ( adjustable from about 25mw to near 300 milliwatts ) this is alot for a toy transmitter , with a 6ft antenna and 6 ft ground side wire I heard my broadcast on a portable AM radio up to 80 ft away , great audio too.