FM Transmitter Module
Product features:
- Using advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation technology (PLL), the sound quality is more realistic, the performance is more stable, and there is no shift in working frequency for a long time.
- LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference.
- Built-in 30-level digital volume adjustment, which can be easily completed by key operation.
- Automatically memorize information such as volume and frequency before power failure.
- Automatic switching of multi-channel audio input.
- Frequency stabilization with high-precision patch quartz.
- Support serial command control.
Product parameters:
- Output power: 100mW
- Frequency range: 50Hz-18KHz
- Transmitting frequency: Turn off campus broadcasting from 87.0MHz-108.0MHz and turn on campus broadcasting from 76.0MHz-108.0MHz
- Frequency adjustment step: 0.1MHz/ time (short press of key), 1.0MHz/ time (long press of key)
- Modulation mode: standard FM FM
- Sound channel: LINE/USB channel (stereo), MIC channel (mono)
- Equivalent noise: ≥30dB (sound quality is close to CD sound quality)
- Power supply voltage: 3.0V-5.0V DC
- Working current: 35mA
- Transmitting antenna: 75cm rod antenna
- Transmitting distance: FM transmitting module is connected with 75cm standard telescopic antenna, Desheng PL-660 is used for radio, and the measured coverage radius in open field is 100m. (Note: the launching distance is for reference only, and there are slight differences due to different use environments.)
Instructions：
Power Supply
The corresponding ports "-"and "+"of the module are connected to the negative pole and positive pole of the power supply (battery) respectively. It is recommended to use the battery or transformer step-down regulated power supply as the power supply. Do not use switching power supply without filter (such as mobile phone charger, charging treasure, switching DC-DC power supply), otherwise the high frequency interference generated by the power supply will affect the normal operation of this module. The normal working voltage of this module is 3.0-5.0V, and the power supply voltage should not exceed this range.
Key
Volume+/-:short press volume +/- 1, long press continuous+/-
Frequency+/-:short press frequency +/- 0.1MHz, long press continuous +/- 1MHz
Mute: short press to switch mute/unmute
Antenna
The ANT port is used to connect the FM antenna. in order to transmit FM signals better, it is recommended to connect an external 75cm-long telescopic antenna, and there is no obstruction near the antenna as far as possible.
USB Audio Connection
If you need the USB audio broadcasting function of this module, you need to connect the USB cable to the computer. The USB port is compatible with ordinary mobile phones, so you can use the USB cable of mobile phones to connect the module with the computer. As the USB of the computer comes with 5V output, the USB port can directly supply power to the module when connecting the computer with USB. After connecting to the computer USB, this module will automatically enter the PC audio broadcasting mode, the LCD screen will display the PC, the computer will automatically install the driver, and give this module a sound card named "CD002", and enable this "CD002" audio device in the computer sound settings, so that the computer system audio can be transmitted by FM through this module, and the nearby radio frequency can be adjusted to be consistent with the transmission frequency of this module.
LINE Audio Connection
If you need the LINE channel of this module to be used as a sound source for transmission, just plug one end of the audio cable into the 3.5mm audio jack of this module and the other end into your audio equipment (such as the earphone hole of mobile phone). At this time, the module automatically switches to the LINE channel as a sound source for FM transmission. The nearby FM radio can hear the audio from the mobile phone as long as it is adjusted to be consistent with the transmission frequency of this module.
FM Wireless Microphone
If you need this module's MIC as a sound source to transmit, just unplug the LINE cable and USB cable (that is, both LINE and USB are not connected), and the module will automatically switch to MIC channel as a sound source for FM transmission. This module comes with a high-sensitivity electret microphone, which can be applied to wireless microphone, maternal and child monitoring, etc. When using, pay attention to adjust the emission volume of this module to achieve the best pickup effect.
Serial Port Control
The module is reserved with TTL level serial port control interface. The TTL serial port needs to connect UART_RX, UART_TX and GND of the module to communicate with the module. The external MCU (Single Chip Microcomputer) or computer serial port can be used to send instructions instead of the key control module. Note: Because the computer serial port level is not TTL level, it is necessary to connect RS323 level to TTL level replacement device or use USB to TTL level serial port module to communicate with this module when connecting computer communication.
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FM Transmitter Module
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