88-108MHz FM Transmitter Wireless Microphone Surveillance Spy Bug Board Module
- Excellent quality: This module is the latest micro-chip FM transmitter module, which is made by better PCB technology. It is compact and easy to fit into thick pen barrels and lighters. The module emits a fairly stable frequency that can be received using any radio, especially with a digital radio. But buyers need to solder the power supply and antennas themselves.
- The principle is simple: the module local oscillator circuit adopts the local oscillator circuit form of the black-and-white TV tuner. The frequency is super stable. It is not the ordinary capacitor three-point oscillation circuit. The module is added to the amplification isolation circuit, and the LC filter circuit and impedance matching are used. The circuit effectively filters out the second harmonic and the third harmonic. The spectrum is very clean. I tested this circuit to 200MHZ. Even if the antenna of the module is caught, there will be no frequency drift. The RF output impedance of the module is The 50 ohm convenient module is directly matched with the power amplifier, which is more suitable for the user’s DIY needs!
- Stable performance: When the module supply voltage is 3V, the emission distance is about 100 meters in an open environment. In a typical indoor environment, the distance is about 20 meters. The higher the voltage, the farther the emission distance is. At 9V, the emission distance can reach 300. Around the meter, the antenna can be used with a whip antenna, a common wire or a rough enameled wire, and the whip antenna and the rough enameled wire have better effects. The length of the antenna is about 75 cm and must be straightened when in use. Of course, the short antenna can also shorten the transmission distance. The transmission distance is only for reference.
- Size: 20mm x 10mm （L*W)
- 1 x Transmitter Wireless Microphone Surveillance Spy Bug Board Module
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