The frequency range of 433.05~434.79MHz and 2.4~2.5GHz is a domestic license-free ISM (industrial, scientific and medical) open frequency band. The use of these frequency bands does not require authorization from the local radio management, so the two frequency bands have been obtained. widely used.
Many users have many questions about the mainstream products in these two frequency bands. We have simply summarized and explained the problems that customers are concerned about, as shown in the table below.
Application selection
Based on the relatively high diffraction sensitivity of 433MHz, the 433MHz product can be actually used in the communication system of the master-slave mode in the following figure. In this way, the master-slave topology has the advantages of simple network structure, easy layout, and short power-on time. This is actually the prototype of the early smart home. 433MHz and 470MHz are now widely used in the smart meter reading industry.
The 2.4GHz application point is a networking protocol developed based on its high-speed transmission rate. The following picture shows the network structure of the intelligent security monitoring system designed by a customer for a large hotel. It uses the ZM5168 series ZigBee wireless module and is equipped with FastZigBee networking protocol. Because our designed network has adaptive function and is very powerful in power consumption. Great advantages, the project includes hotel wireless door locks, wireless smoke and other equipment. The hotel security monitoring room and front desk can monitor the security status of the hotel building in real time.
In short, if the network topology and functions are simple, one master and multiple slaves, but the network environment is complex and cost-limited, it is recommended to filter the 433MHz product preferentially; if the network topology is complex, the functions are numerous, the network is robust, and the power consumption is low. Simple development, 2.4GHz products with networking features will be your best choice.
Medium Voltage STA Armored Cable
Medium voltage STA cable is a type of Power Cable used for transmitting electricity at medium voltage levels. The armored cable is designed with a steel tape armor layer that provides mechanical protection to the cable against external forces, such as impact, crushing, and abrasion. The armor layer also provides protection against rodents and other animals that may damage the cable.
The medium voltage STA cable is typically used for underground and overhead installations in industrial, commercial, and residential applications. It is suitable for use in harsh environments, including areas with high humidity, corrosive gases, and high temperatures.
The cable is constructed with a copper or aluminum conductor, insulated with XLPE or EPR material. The insulation provides electrical insulation and protects the conductor against moisture and other environmental factors.
The steel tape armor layer is applied over the insulation layer and provides mechanical protection to the cable. It is made of galvanized steel and provides excellent resistance to corrosion.
The medium voltage STA cable is available in various sizes, ranging from 3.3 kV to 33 kV. It is manufactured in compliance with international standards, such as IEC, BS, and ASTM. The cable is tested for quality and safety before it is supplied to customers.
In summary, the medium voltage STA armored cable is a reliable and durable power cable used for transmitting electricity at medium voltage levels. It is suitable for use in harsh environments and provides mechanical and electrical protection to the cable.
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