Important information about radio modems

Since their development in the 1990s, the concept of wireless networks and associated communication forms has been considered a great innovation and a remarkable advancement in technology that most gadgets and tools experts believe in the world of industrial communications. the main reason for the current revolution. And what do you think he stood at the forefront of this revolution? The answer is nothing but wonderful modems and similar devices. Regardless of whether you want to know more about the use, operation or applications of radio modem on SRD bands or other similar technologies, these products have some basic facts and key features that are found in each. device. Insist on us because we show you in detail what radio models are and how they have changed our surrounding environment.

The digital radio modem, also known as a radio transceiver, is used for short-distance transmission of physical wires, but rather for transferring data to wireless systems transmitting data to another device of the same type. multipoint or point-to-point relationship. Their range is very different from transmission power, environment, antenna strength, and radio frequency contamination (other system transfers) or near multipath fading in nearby environments. If you use hundreds of thousands of Watts radio modems, the maximum range of 100 km is available if the environment is unfavorable (the distance of the Earth must be taken into account at certain distances). However, many leading regions are usually covered with radio modem repeaters.

For building automation or industrial applications, the same considerations apply to open field radio transmission, but have to deal with other tricky phenomena. Even if the ranges to be covered are shorter, from ten to 100 meters, there are two main interactions with buildings and objects in the environment that affect radio transmissions that reduce the signal level on the receiver side and are less reliable for radio connections.

first Absorption of barriers (walls, doors, furniture, floors, ceilings, people, household appliances);
2. Obstacles are multiple paths, ie multiple reflections of the same signal that simultaneously arrive at the receiver in different copies. Multiple reception of different non-phase copies of the same signal can significantly reduce signal strength.

The last phenomenon is particularly mysterious, because changing the radio frequency patterns that can simply be caused by the movement of people or furniture may fall on a radio link that seemed strong enough to lose control of the remote wireless device. . Recently, some high-performance SRD radio modems offer antenna diversity that can mitigate or even transform indoor multi-path phenomena. In fact, on a receiving side, multi-path phenomena create areas where the signal is stronger and the other is weaker; these are the distances between adjacent and alternative areas at at least 10-30 cm SRD band frequencies. An array of antenna technology allows the receiver to receive the initial portion of the data packet from two antennas at the same time, and select which one is more convenient to receive. If the antenna is conveniently located at a distance of 10-30 cm, at least the signal will be strong enough for one of them. This increases the signal level from an average of 10dB to 15dB and can cause a big difference: a lost wireless device means you can continue to control the radiator, measure it from a thermostat or a portable biomedical device that is used for patients. hospital.

Some features to be properly evaluated for building automation and industrial or medical applications are:

– Maximum data rate
– Maximum data packet length (byte)
– Possibility of RF power
– Change of frequency possibility [channel
– possibility to change bandwidth
– Ability to skip buffering on transmitter and receiver side by avoiding reduction of real data rate
– Receiver sensitivity
– Antenna diversity

Bandwidth with data rate the ability to change coincidentally is important not to waste the use of the radio frequency, and even if the radio modem allows you to change the bandwidth, it can be reduced if the lower data is

There are many other interesting facts and information that you know about st must be obtained. the world of wireless broadcasts, regardless of the frequency and performance of the session. These facts include details of private wireless modems, such as normative considerations (use of unlicensed or limited frequency bands), or internal stages of communication that are primarily encoding data from a high level of view, secondly, data transmission and finally data transmission. . In addition, these communication devices are subsystems of a higher level storage device and must communicate with them. External radio modem, usually high performance radio, RS422, RS485, RS232 or USB; while in the case of SRD bands, the modems are small in size as stamps and are usually welded to the PCB, UART or SPI interfaces of the host device.

Other applications of these communication technologies include video security, mining, city bus surveillance, and the oil and gas industry, or even long distance sports, and many other activities that require a permanent line of participants. communication.

An amazing discovery on the edge of the modern revolution of technology, wireless and radio systems, which has greatly influenced the world in which we live. Modern industrial radio modems are used to encode data, then transmitted and finally decoded. Their technology is based on the use of radio waves as a means of transmitting information, resulting in significant improvements over previous wired data. Finally, the applications of these technologies are so large that they have been called unlimitedly by professionals working in the field, which means that the creativity of the user is the only thing he is doing.

Source by sbobet

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