Fully integrated DSP digital synthesizer FM transmitter module! Crystal frequency stabilization never drift! Sound quality than the class of 1417 to be on a grade. Personal feeling behind professional radio station， FM transmitter on the market is not a rival.
There are on-board microphone， high sensitivity can be heard throughout the room to speak.
Using methods and parameters， please continue to look down
Usage: According to the figure connected audio cable， antenna， and finally power; press the button to see the board to adjust the transmission frequency to display target frequency， turn on the radio， the input audio.
A total of two key board.
Press once to change the frequency is raised or lowered;
Do not increase or down and hold the release， in 1-2 seconds， the digital display off， then press another button to release after all the keys， LED lamp status change on the board， indicating switching mono / stereo success;
Press and hold the raised or lowered in 1-2 seconds， the digital display re-open， the frequency changes rapidly until reach the desired frequency close to let go， making fine tuning;
LED lights: stereo， LED lamp: Mono
Function parameters:
* Key idle for some time digital and stereo instructions， reducing power consumption; a display with keys or just energized for some time.
* Power and memory frequency， memory stereo， mono transmission mode
* Transmitting frequency range: 65-125MHz full-band tunable， stepping 0.1MHZ;
* Audio input signal amplitude: -10dbv
* Supply voltage: 7V-25V wide range DC
* Transmission Distance: This is only for reference， I tested under favorable conditions can reach 300 meters， usually covering a room absolutely can， in general is 50-200 meters
* Stereo separation: better than 36db