Which frequency band is better, 433M or 2.4G?[Copy link]
The frequency range of 433.05~434.79MHz and 2.4~2.5GHz belongs to the domestic unlicensed ISM (Industrial, Scientific and Medical) open frequency band. There is no need to apply for authorization from the local radio management to use these frequency bands, so these two frequency bands are widely used. Customers have many questions about the mainstream products of these two frequency bands. We have briefly summarized and explained the issues that customers are most concerned about. See the figure below for details. Application Selection Based on the high receiving sensitivity and relatively strong diffraction performance of 433MHz, for example, in the master-slave mode communication system in the figure below, 433MHz products can actually be used. Such a 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. Dawei Zhitong wireless modules, including wireless switch control, wireless data transceiver modules, etc., are applied to 433MHz and 470MHz. Now it has been widely used in the smart meter reading industry, robot industry, and workshop scheduling industry. The application point of 2.4GHz is the networking protocol developed based on its high transmission rate. It can be used for hotel wireless door locks, wireless smoke detectors and other equipment. The hotel security monitoring room and the front desk can monitor the safety 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 the cost is limited, it is recommended to give priority to 433MHz products; if the network topology is relatively complex, the functions are numerous, the network is strong, the power consumption is low, and the development is simple, 2.4GHz is also a good choice.
The fact that low frequencies can penetrate walls more (more precisely, the propagation distance inside buildings is longer) is mainly achieved through diffraction.
topwon posted on 2018-11-5 11:40 I think the fact that low-frequency waves can penetrate walls more easily (more precisely, they can propagate farther inside buildings) is mainly achieved through diffraction.
This post was last edited by dwzt on 2019-1-10 08:56
qwqwqw2088 posted on 2019-1-3 09:25 In some places, cost considerations are considered, and it is recommended to give priority to 433MHz products with low power consumption requirements. 2.4GHz
btty038 posted on 2019-1-3 12:26 You see, amateur wireless frequency band shortwave radio stations can transmit for a long distance. 2.4G is too common. Everything is a feeling.
It seems that you have used it more and have used everything.
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