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wireless remote control
Aug 09, 2018

Encoding

There are two types of coding methods commonly used in radio remote control, namely rolling code and fixed code.


Rolling code:

Common Transmitter Receiver Module SR9915

Common Transmitter Receiver Module SR9915

1. The security type is strong, and the code is automatically changed after each launch. Others cannot use the "detector" to obtain the address code.

2. The coding capacity is large, the number of address codes is greater than 100,000 groups, and the probability of using "heavy code" is extremely small;

3, easy to code, rolling code has a learning storage function, no need to use a soldering iron, can be on the user site, and a receiver can learn up to 14 different transmitters, with a high degree of flexibility in use;

4. The error is small. Due to the advantage of coding, the receiver's malfunction when it does not receive the local code is almost zero.


Fixed code:

1. The coding capacity of the fixed code is only 6561, and the probability of the re-code is extremely large. The code value can be seen through the solder joint connection.

2, in the use of the field with "detector" to obtain, not confidential, mainly used in applications with low confidentiality requirements, because of its low price, it has also been used in a large number of applications.


Influencing factor

The main factors affecting the Remote Distance of RF Remote Control are as follows:

1. Transmitting power: If the transmitting power is large, the distance is long, but the power consumption is large, and it is easy to cause interference;

2, receiving sensitivity: the receiver's receiving sensitivity is increased, the remote control distance is increased, but it is easy to be disturbed or out of control;

3, antenna: the use of linear antennas, and parallel to each other, remote control distance is far, but occupy a large space, in the use of the antenna to lengthen, straighten can increase the remote control distance;

4, height: the higher the antenna, the farther the remote control distance, but subject to objective conditions;

5. Blocking: The wireless remote control used uses the UHF frequency band specified by the state, its propagation characteristics and light approximation, linear propagation, and small diffraction. If there is wall blocking between the transmitter and the receiver, the remote control distance will be greatly discounted. The walls of concrete are more affected by the absorption of electric waves by conductors.



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