2000M 0.5W FM Transmitter Frequency LED display Stereo Digital 88M-108MHz FOR DSP Radio broadcast Campus Radio Station Receiver

0.5W FM Transmitter FM Stereo transmitter 88M-108MHz FOR Campus Radio DSP Radio broadcast Station Receiver w LED Digital LED display1500m FM Transmitter 500mW Stereo FOR Campus Radio FM transmitterOutput frequency: 88-108MHz 100KHz step （200 frequency transmissions）Display mode: LCD display. The display content is the current transmitting frequency. The actual test transmitter is in the open field, and the maximum distance is 2000MOutput power: 500mM (0.5W)Supply voltage: 5V USB-type-CSupply current: 500mAInput Signal: Audio Stereo   3.5MMSignal-to-noise ratio: 63dB0.05%THDweight:50g FM Transmitter Operation ManualOperating Instructions for 0.5W FM Transmitter Power supply requirements: 0.5W FM transmitter uses USB Type C interface for power supply, with power supply voltage of 5V and consumption current of no more than 500mA. Input audio signal: 3.5mm stereo audio socket, 3.5mm male audio cable is required. Transmitting interface: The transmitter side is SMA female head with external thread and internal hole. SMA male head and signal wire of internal thread shall be used for connection. The characteristic impedance of the signal line is required to be 50 ohms, Teflon material is recommended, the recommended specification is 50-3, and the line length is not less than 2 meters. Antenna requirements: the working frequency should be 50 ohm pure resistive load, and the VSWR should not be higher than 1.5. Note: Since the transmitter's transmission power is 0.5W, the transmitter will not be damaged in the total reflection state, so the requirements for the antenna are not high. The more qualified the antenna is, the farther the transmission distance is. Description of operation sequence: 1. Connected to antenna 2. Connected to power supply 3. Connected to audio inputKEYS: DW (step): The default state is to lower the frequency (DW) and step to 0.1MHz. When the frequency drops to 76MHz, it will automatically cycle to 108MHz. Press and hold the DW key for 3 seconds to switch to 1MHz step and the LED is on for a long time. Press and hold the DW key for 3 seconds again to switch back to 0.1MHz step and the LED is off. UP (res): The default state is up regulation (UP) and the step is 0.1MHz. When the frequency rises to 108MHz, it will automatically cycle to 76MHz. Frequency reset: press and hold the res key for 3 seconds, and the output frequency will automatically return to 90.00MHz. Each time you press the key, the LED will flash. Five seconds after the operation of all buttons is stopped, the led flashes, the machine saves the current working frequency, and the next time the machine is powered on, it will automatically work at the saved frequency. Audio input: The input audio volume should be adjusted according to the radio reception effect, so that the sound is clear without distortion. Power input: 5V power supply, the maximum is not more than 5.5V. If the maximum working voltage is exceeded, the transmitter may be damaged. D5W FM Transmitter Operation Manual V101 Use a mobile phone charger with a USB type-c charging cable. The charger should try to use products with low ripple and low noise, so that the output signal quality of the transmitter is better. Antenna: The antenna should use a GP antenna (umbrella antenna), a 50 ohm coaxial line above 2 meters, and be connected to the transmitter using SMA male. Theoretically, the thicker the feeder, the better. The 50-3 specification is recommended as a compromise. VSWR should not be higher than 1.5. A good antenna helps to increase the transmission distance. Under ideal conditions, a pair of adjusted antennas can transmit a distance of 2000 meters. Of course, a pair of antenna that has not been debugged or has not been debugged well, the transmission effect is disastrous, which may be only a few hundred meters, or even tens of meters! Antenna knowledge An antenna is an open device that emits electromagne