The integrated performance of the hands-on capability and technology of the FM radio station during commissioning. The transmitting board is designed to be part of a circuit such as audio amplification, local oscillator, high frequency amplification, and output impedance matching harmonic suppression.

The TFM009 launch board is used as a wireless phone, a low-power FM factory broadcast radio, a TV audio wireless forwarding, and a smart wireless device. Operating voltage range: 1.57-9V, easy to use and very wide operating voltage. The higher the voltage, the greater the output power and the farther the emission distance.    The actual test work is still stable at 127, but after more than 97 voltage, the output power is almost not increased by the spectrum analyzer test, so it is recommended that the work is within 9V.

 TFM0O9 consists of 3 major parts: MIC audio amplifier stage, local oscillator, high-frequency amplifier stage, and the biggest difference between other FM experiment boards. The original self-oscillation circuit adopts the most stable LC oscillation circuit design (the local oscillator stage adopts the old-fashioned black-and-white TV). The local oscillator circuit in the high frequency head), the frequency drift is very small! The high frequency amplification is also different from the ordinary experimental board. The LC resonant amplifier is used, and the output part uses LC impedance matching and high frequency filtering to suppress the second harmonic. The circuit is tested by a professional analyzer of the spectrum analyzer, and the transmitted wireless signal is almost at the level of a professional radio station.

 

Working voltage: 1.5V-9V, current: 33MA-29MA

Working frequency: FM band 85-115MHZ

Receiving equipment: FM radio / mobile phone with FM radio, etc.

Audio response: 20HZ-15KHZ

RF power: -2dbm-15dbm

RF output impedance: 50 ohms Second harmonic: >-40db

Transmission distance: 100 meters - 1000 meters

1 x FM Wireless Microphone DIY Kits Suites FM Radio Transmitter 1.5-9V 85-115MHz