FM Stereo Transmitter With Adjustable Frequency For Devices DESCRIPTION Features: * Brand new and high quality * Made of high quality materials, * The product frequency is adjustable, with a total of 320 transmit frequencies and a memory function * Ordinary radios and radios that can receive FM broadcasts can well receive the signals transmitted by this transmitter. * LCD display, the displayed content is the current transmission frequency * Product performance is stable and service life is long Specification: FM transmitter model: RC-FM Version: V100 Output frequency: adjustable frequency, working range 76MHz, 108MHz or 0.1MHz step, a total of 320 transmit frequencies, with memory function Output power: 10~500mW (0.01~0.5W) 77-108MHz Receiving equipment: ordinary radio. A radio that can receive FM broadcasts can well receive the signal transmitted by this transmitter. Display: LCD screen, the display content is the current transmitter frequency. The maximum transmission distance of the transmitter in open areas can reach 2000 meters. Supply voltage: 5V Type-CB cable Supply current: 500mA Input signal: audio stereo, 3.5mm interface standard signal-to-noise ratio: 63dB 0.05% THD Product reply: Question: What is this thing used for? Answer: This is an FM transmitter. It can be regarded as a for SMAll FM radio station, which inputs audio signals, outputs FM high-frequency signals, and transmits them into the air through the antenna. People far around picked it up via radio. Q: Is this a stereo transmitter? Answer: Yes, this is a stereo transmitter. Q: Are there batteries inside the transmitter? Answer: The transmitter does not have a built-in battery and requires an external power supply. Q: How is the transmitter powered? A: The transmitter is powered by 5V DC, the power supply interface is USBe , and the current consumption is about 20OmA. The current consumption is about 20OmA. If a low-quality power supply is used, the transmitter may not work properly or the transmission quality will be degraded, and the radio terminal will receive obvious noise. The power supply voltage requirement is 4.8-5.5V, exceeding this range may cause the transmitter to work abnormally or even be damaged, please pay attention! Q: Can I use a microphone as a transmitter? Answer: The transmitter cannot be plugged directly into the microphone. If you use a microphone amp lifier, you can feed the amplified microphone signal into the transmitter. Q: Is it possible to connect a dummy load to the antenna port of the transmitter to replace the antenna? Answer: No. The dummy load is a pure resistor that absorbs the signal output from the transmitter and the transmitter will emit no energy into the air. By connecting a dummy load to this transmitter and relying only on the weak power that leaks out, the radio will be able to receive the transmitter's signal within a meter or two at most. The dummy load and the antenna are two devices with opposite functions and cannot be replaced. Q: How to set the transmission frequency? A: The transmitting frequency can be adjusted through the two buttons on the panel. You can select step to change the frequency step by step at 1MHz or 0.1MHz. Stop pressing the button for 5 seconds. The transmitter will automatically remember the currently set frequency and will automatically do so the next time it is started. Transmit at this frequency without setting the frequency again. Q: How to adjust the transmit power? A: Press and hold the UP key to enter the power setting mode, and press the DOWN/UP key to set the transmit power. The transmission power can be set between 10mW~500mW. There are 11 power levels. After pressing the button for 3 seconds, it will automatically switch to the frequency adjustment mode and save the current transmit power. It will automatically remember the last transmit power and frequency when it is turned on next time. Q: Can it really transmit 2000 meters? Answer: Transmission distance is directly related to transmit power, propagation conditions and antenna performance. The claimed 2000-meter transmission distance is achieved under the conditions of a transmitting power of 500mW, an antenna set on the 14th floor, and no obstruction between transmitting and receiving. The antenna is strictly adjusted by the antenna analyzer, and the standing wave at the transmitting frequency is 1.2. Q: Can I connect a whip antenna directly to the transmitter? Answer: Yes, but you should pay attention to phenomenon: if you hear a beep or buzz from the radio after using the telescopic antenna, it means there is interference. In this case, this phenomenon can be reduced or avoided by reducing the transmit power. If this interference persists, the only way to avoid it is to move the transmitting antenna away from the transmitter and front-end sound sources. The antenna is a heat sink, which will cause interference to surrounding electrical equipment when transmitting high power, so once you find that your front-end signal is not strong, the only way is to keep the antenna away from the transmitter and transmitter. The front end uses a feeder. This can effectively avoid interference. Question: can signals be received near the receiving frequency point +-0.1MHz? Answer: This is because the signal received by the walkie-talkie is too strong and it is impossible to move the walkie-talkie away from the transmitter at this time. Q: does my radio feel interfered with and less sensitive when operating on other frequencies? Answer: When there is a super strong transmitting signal near the receiving frequency, the radio will be suppressed. This is when it is necessary to reduce the transmit power or move the radio further away from the transmitter to reduce the suppression level of a strong station. High-end radios have extensive filters on the front end to enhance this resistance to suppression. Q: What is the audio input interface of the transmitter? A: The input is a standard 3.5mm audio interface, and the input volume must be appropriate. The input volume is too loud and the distortion is obvious. The volume needs to be reduced so that the final effect reaches the quality of an average FM broadcast.
