RC-FMD5W2 76-108MHz 2KM Digital Display FM Transmitter 0.5W Stereo Transmitter with Memory Function

RC-FMD5W2 76-108MHz 2KM Digital Display FM Transmitter 0.5W Stereo Transmitter with Memory Function

Description:
- This device is a stereo frequency modulation emitter and also can be considered a portable radio station. It converts audio signals into high-frequency modulation signals transmitted through the air via an antenna for distant radio reception. Suitable for private broadcasting, campus radios, and other scenarios. The panel is equipped with two buttons that support frequency adjustments in 1MHz or 0.1MHz precision, and power settings ranging from 10mW to 500mW (a total of 11 precision). It also features a memory function that automatically saves your settings for use the next time you turn the device on.

Specification:
- Model: RC-FMD5W2
- Version: V100
- Output frequency: frequency adjustable, working range of 76-108MHz, with a step of 1MHz or 0.1MHz, 320 transmitting frequency in total, with memory function.
- Output power: 10 - 500mW (0.01 - 0.5W) at 88 - 108MHz
- Receiving devices: normal radios that can receive FM radio can receive the signal emitted by this transmitter well.
- Display method: LCD display shows the current transmission frequency. It has been tested that this transmitter can reach a distance of 2000 meters in open areas using a full-size GP antenna (not included).
- Power supply voltage: 5V USB Type-C (power supply and USB Type-C power cable are not included)
- Power supply current: 500mA
- Input signal: audio stereo, 3.5mm interface standard
- Output specification: high frequency power 500mW (maximum), 50ohms
- SNR: 63dB, 0.05%THD
- Net weight: 120g
- Product size: 8.5 x 5 x 2cm (excluding the connector length)

Note:
- This is a transmitter, not a radio.
- This transmitter cannot be directly plugged into a microphone.
- The transmitter does not have a battery inside and requires external power supply.
- This is a transmitter and cannot be used to enhance radio signals. If you want to enhance the signal, please buy an outdoor antenna or antenna amplifier (not included).
- The transmitter needs to be connected to an antenna in order to transmit, so it is essential to connect the antenna.
- The transmitter socket buttons and other areas that require repeated force have been manually welded to prevent breakage due to excessive force.

Package Included:
- 1 x Transmitter

FAQ:
Q: Is this transmitter stereo?
A: Yes, this is a stereo transmitter.

Q: Is there a battery inside the transmitter?
A: The transmitter does not have a battery inside and requires external power supply. Logistics and express delivery companies may restrict the transportation of products with built-in batteries.

Q: How is the transmitter powered?
A: The transmitter is powered by 5V DC and the power interface is USB Type C specification. The current consumption is approximately 200mA. If a low-quality power supply is used, it may cause the transmitter to malfunction or the transmission quality to deteriorate, and the radio end will receive noticeable noise. The power supply voltage requirement is 4.8-5.5V. Exceeding this range may cause abnormal operation or even damage to the transmitter. Please be aware!

Q: Can the transmitter use a microphone?
A: The transmitter cannot be directly plugged into the microphone. If a microphone amplifier is used, the amplified microphone signal can be input to the transmitter.

Q: Can a dummy load be connected to the antenna port of the transmitter to replace the antenna?
A: No, the dummy load is a pure resistor that will absorb the signal output by the transmitter, and the transmitter will have no energy to emit into the air. By connecting a false load to this transmitter and relying solely on the leaked weak power, the radio can receive the signal from this transmitter within one or two meters. Dummy loads and antennas are two devices with opposite functions and cannot be used as substitutes.

Q: How to set the transmission frequency?
A: The transmission frequency can be adjusted through two buttons on the panel, which can be selected in steps to change the frequency by 1MHz or 0.1MHz. Stop pressing the button for 5 seconds, and the transmitter will automatically remember the current set frequency. The next time it is turned on, it will automatically transmit at this frequency without the need to set the frequency again.

Q: How to adjust the transmission power?
A: Enter the power setting mode by long pressing the up key, and set the transmission power by pressing the up and down keys. The transmission power can be set between 10mW and 500mW, with a total of 11 power levels. Press the button to stop for 3 seconds and automatically switch to frequency adjustment mode, saving the current transmission power. The next power on will automatically remember the previous transmission power and frequency.

Q: Can it really transmit for 2000 meters?
A: The transmission distance is directly related to the transmission power, propagation conditions, and antenna performance. The nominal 2000 meter transmission distance is achieved under the conditions of a 500mW transmission power, a full-size GP antenna installed on the 14th floor, and no obstruction between transmission and reception. The antenna is strictly adjusted by the antenna analyzer, and the standing wave at the transmission frequency is 1.2. The optional telescopic antenna can emit 100-200 meters in open and unobstructed environments. Note: Floor obstruction and multiple wall partitions can significantly reduce the launch distance.

Q: Can I directly connect a telescopic antenna to the transmitter?
A: Sure, but pay attention to one phenomenon: if you hear a beep or buzzing sound in the radio after using a telescopic antenna, it means that it has been interfered. At this point, this phenomenon can be alleviated or avoided by reducing the transmission power. If this interference persists, then the transmitting antenna can only be kept away from the transmitter and front-end audio source. An antenna is a radiator, and when it emits high power, it can cause interference to surrounding electrical equipment. Therefore, if you find that your front-end cannot work under strong signals, you can only use a feeder to keep the antenna away from the transmitter and front-end, which can effectively avoid interference.

Q: Why can signals be received within +/-0.1MHz around the receiving frequency point?
A: This is because the signal received by the radio is too strong. At this time, moving the radio away from the transmitter will eliminate this phenomenon.

Q: Why does my radio feel disturbed and its sensitivity decreases when receiving broadcasts on other frequencies while the transmitter is working?
A: The radio operates under strong transmission signals near the receiving frequency and will be suppressed. At this point, it is necessary to reduce the transmission power or keep the radio away from the transmitter to minimize the degree of suppression by the strong station. High end radios have a large number of filters at the front end to enhance their ability to resist suppression.

Q: What is the audio input interface of the transmitter?
A: The input should use a standard 3.5mm audio interface, and the input volume should be appropriate. If the input is too large, it will cause distortion. The volume should be reduced to achieve the quality of a typical FM radio station. Note: This transmitter does not support microphone input.

Q: What is the transmitter antenna interface like?
A: The transmitter antenna interface is SMA female. The corresponding antenna side requires to use male connectors.