The advantages and characteristics of our latest research and development of FM module:
1, the FM transmitter module onboard microphone micro high sensitivity microphone, the materials we use mobile phone microphone, high sensitivity, clear voice, module power, to become a FM wireless microphone, you can hear the voice or speech environment.
2, the module can transmit stereo signal, remember a few years ago, we often use the crystal to launch a stereo signal scheme BA1404 stereo transmitter +38KHz, but the stability that we use now is far greater than that of BA1404, the use of the IC is completely digital type working mode, no longer use the analog circuit combination therefore, the frequency is very stable, there is hardly any drift issue, at least we test up to now has not found a case of a frequency with customer feedback. When you want to launch a stereo signal, such as CD, MP3, MP4 and other audio player, as long as the use of audio cable into the stereo input module emission hole, and the size of the headset jack. For example, in the car, when your MP3 and FM emission emission module is connected to a stereo signal, you can use the car with the radio signal. Then, the FM transmitter module has become a FM wireless repeater)
3, FM transmitter module frequency adjustable! At the same time with power memory function. Remember, we often will come to the value of frequency adjust potentiometer or adjustable inductance, such adjustment can be said to be a frequency adjustment about value, and can not be transferred to a very accurate frequency point, after all, adjustable inductance or potentiometer element itself has the error problem, and use a screwdriver to adjust there a process of mechanical stress. Now in this FM module, we use the patch contact switch to adjust the frequency, we design two buttons on the module, a key is to increase the frequency of a frequency is reduced, the button, button every time, frequency by 0.5MHz step value of course, we can also adjust the frequency of the 0.1MHz to the nearest step step, we now set the factory into the value of 0.5MHz, if you need to change the step value and can contact us if you need to change the FM transmitter module frequency value is fixed, can also contact us by setting change.
Instructions：
The default frequency: 86Mhz, per CH+, increased frequency of 0.5Mhz, the increase of >106Mhz, according to CH+ does not play a role; each CH- frequency decreases when the frequency of <66Mhz, according to 0.5Mhz, CH- has no effect; long press CH+/CH-, the frequency is set to the default value of 86Mhz.
When the user gets the FM FM transmitter module, only need to be connected to the antenna and power on it, the module itself is not an antenna, the picture shows the appearance of our antenna after welding, the best length of the antenna is 75CM. The antenna on the right side of the device, mass production, no longer do welding, does not affect the use of function.
FM transmitter module can pick up the surrounding environment and its weak sound signal, and the sound is transmitted by FM modulation mode, the frequency can be adjusted in the range of 66Mhz-106Mhz. The receiver can receive a radio receiver with a FM receiving function, such as an ordinary FM radio, a mobile phone, a car audio, etc.! The receiver can be found everywhere!
This module does not need to debug, installation and welding time as long as three lines on it – power poles and the antenna, the antenna as long as get a clear good effect with a metal wire can note the negative do not take the wrong oh!
This product is widely used in hotels, can penetrate five walls, the effect is still very good! Can be used for the elderly children, wireless communication, wireless signal transmission, hotel sound pickup, security, etc.!
1, working voltage 6-9V, operating current 170mA
2, module size: 60*18mm
3, the frequency range of 66Mhz-106Mhz, the transmission frequency covering the entire FM band, through the key adjustment. Launch distance: open ground theory: 1000 meters
4, the emission frequency interval 0.5MHz, if you want to modify the step value, you can contact us.
5, compact size, area equivalent to half of the chewing gum is also small.
6, the use of a wire as an antenna, the length of the antenna can be appropriately increased or reduced according to the actual amount of the environment!
7, and FM radio in FM emission test and use, no distance limit, as far as 1000 meters, close to a few centimeters, not because of the distance and noise.
8, the frequency point is stable and accurate, automatic search platform can capture, use more convenient.
9, the transmission distance and the surrounding environment of the antenna also has a great relationship, the higher the emission height, the less the reinforcement and concrete structure, the better the effect and distance. Of course, the best place to open!
