Features：
1. Excellent quality: This module is the latest micro-patch FM transmitter module, which is made of good PCB technology, small in size and convenient to put into rough pen barrels, lighters, etc. The frequency emitted by this module is quite stable and can be received by any radio, especially by digital radio. All components are made of large-brand SMD devices. Quality please rest assured that buyers need to weld the power supply and antenna themselves.
2. The principle is simple: the local oscillator circuit of the module adopts the local oscillator circuit form of the black-and-white TV tuner, and the frequency is super stable. It is not the kind of ordinary capacitor three-point oscillator circuit that can be compared with the module. The LC filter circuit and impedance matching circuit effectively filter out the second harmonic and the third harmonic, and the spectrum is very clean. After my test, even if the antenna of the module is grasped by hand, there will be no frequency drift, and the RF output impedance of the module is 50 ohms, which is convenient for the module to directly match with the power amplifier, which is more suitable for users’ DIY needs!
3. Stable performance: when the power supply voltage of the module is 3V, the emission distance is about 100m in the open environment, and it is about 20m in the general indoor environment. The higher the voltage, the farther the emission distance is, and the emission distance can reach about 300m at 9V voltage. The antenna can be tie-rod antenna, common conductor or thick enameled wire, and the tie-rod antenna and thick enameled wire are better. The length of the antenna is about 75 cm, so it must be straightened when used. Of course, the antenna can be shorter, and of course, the transmission distance will be shortened. It is only for reference and specific suggestions.
4. Wide application
5. The product is compact
Specification:
“Working voltage” DC 2V-12V (A) (It is recommended to use batteries for power supply. The regulated power supply will have AC sound, and the frequency of voltage rise will change slightly, but the long-term working frequency will not change under the same battery supply.)
【 Operating current 】 9mA(3V voltage test, super power saving, voltage increase-> current increase-> power increase-> further distance,) [Launch distance] 100 meters in the open space (3v voltage test), the indoor wall penetration distance decreases, and the reinforced concrete wall distance decreases obviously. Increasing the voltage can greatly increase the distance.
[Operating frequency] 85MHz –115MHz (default factory frequency is generally between 99.0 MHz and 100.9 MHz)
[Receiving method] Ordinary FM radios can receive it, as can mobile phones with FM function. Our store also has two receiving (FM radio) modules. App radios that use network data traffic cannot receive it.
[Frequency adjustment] The miniature adjustable capacitor on the circuit board can adjust the frequency by twisting it with a small screwdriver.
[Output impedance] 50 ohms [Sensitivity] The microphone is placed in a quiet room of 15m2, and the sound of the second hand of the quartz clock is clearly audible.
[Usage] High-sensitivity wireless microphone, wireless recording, wireless monitoring, remote recording, maternal and child care, patient care, etc.
Because of its high sensitivity, it is not suitable for stage performance and is prone to howling. Please do not use it for illegal eavesdropping! At your own risk!
Package Include:
1* module
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