Well, I ve been using a data radio station lately, and I don t know what it is!

Data radio, also known as "wireless data radio". Refers to high-performance professional data transmission radio stations with the help of DSP technology and radio technology. The use of data transmission radio has developed from the earliest key code, telegraph, analog radio and wireless modem to the current digital radio station, DSP and software radio; The transmission signal also ranges from **, low-speed data (300 1200bps) to high-speed data (n*64k n*e1), which can transmit services including remote control telemetry data, digital voice, dynamic image and so on.

At present, the data transmission radio stations used include: MDS radio station in the United States, SATEL data transmission radio station in Finland, and digital radio station is the abbreviation of digital wireless data transmission radio. That is, digital signal processing and digital modulation are used.

Wireless data transmission radio is a wireless data transmission radio that adopts digital signal processing, digital modulation and demodulation, forward error correction, equalization soft judgment and other functions. Different from the analog FM radio with modem, the digital radio provides a transparent RS232 interface, the transmission rate is up to, the transceiver conversion time is less than 10ms, and it has the functions of field strength, temperature, voltage and other indications, bit error statistics, status alarm, network management and so on. As a communication medium, wireless data transmission radio has a certain scope of application like optical fiber, microwave and bright wire

It provides real-time and reliable data transmission of monitoring signals in the private network under certain special conditions, and has the characteristics of low cost, convenient installation and maintenance, strong diffraction ability, flexible networking structure, and long coverage, and is suitable for many points and scattered geographical environment.

Finland's SATEL radio station has been used by our unit really well.

In China, there are **. **：

Complete! Please give it points!

Oh, I bought it, and Satell does feel better than other stations. China seems to have **.

Wireless data transmission radio refers to a high-performance professional data transmission radio station realized by DSP technology and radio technology, and its main role is to provide real-time and reliable data transmission of monitoring signals in the private network under certain special conditions.

The radio modem of the data transmission file is also known as the "wireless data transmission radio" and "wireless data transmission module". It refers to a high-performance professional data transmission radio station realized by DSP technology and softkey radio technology.

Electromagnetic wave AM

The radio station transmits the signal through electromagnetic waves, and the reception of the signal is to listen to the radio by receiving the signal transmitted by the radio From the chart, the unit of AM is kilohertz, and the unit of FM is megahertz Since the propagation speed of electromagnetic waves is constant, it can be seen from the formula c = f that when the wave speed is constant, the wavelength is inversely proportional to the frequency, that is, the smaller the frequency, the greater the wavelength

Hence the answer: electromagnetic waves, AM