Applicable to Haier HTR-A07 model card 43A3 LCD TV remote control universal HTR-A07B A07M

Applicable to Haier HTR-A07 model card 43A3 LCD TV remote control universal HTR-A07B A07M

Coding mode and influencing factors of wireless remote control

Coding method

There are two types of coding methods commonly used for wireless remote control, namely, rolling code and fixed code

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Scroll code:

Common transmitting and receiving module SR9915

1. Strong confidentiality, the system automatically changes the code after each launch, and other people cannot use the "code detector" to obtain the address code;

2. The number capacity is large, the total number of address codes is more than 100000 groups, and the probability of "duplicate code" is very small during use;

3. It is easy to match the code. The rolling code has the function of learning and storing. It does not need a brand. It can be matched on the spot by the user. The receiver can learn up to 14 different types of transmitters, with high coordination ability;

4. The error code is small. Due to the advantages of numbering, the error operation of the receiver is almost zero when the local code is not received.

Fixed code:

1. There are only 6561 fixed codes with the number capacity, and the probability of duplicate codes is high. The number value can be seen through the solder joint connection.

2. The use of "code detector" on the spot has no confidentiality and confidentiality. It is mainly used in occasions with low security requirements. Because of its low price, it has also been widely used.

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influence factor

The main factors affecting the distance of radio remote control are as follows:

1. Transmission power: large transmission power, long distance, but large power consumption, easy to interfere;

2. Receiving sensitivity: the receiving sensitivity of the receiver increases, and the remote control distance increases, but it is vulnerable to interference, resulting in misoperation or loss of control;

3. Antenna: linear antenna is used, which is parallel to each other, and the remote control distance is relatively long, but it takes up a large space. Lengthen and straighten the antenna during use to increase the remote control distance;

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

5. Shielding: Use the UHF frequency band of the wireless remote controller specified by the state, and its transmission characteristics are similar to that of light, with linear transmission and small group. If there is a wall between the transmitter and receiver, the remote control distance will be greatly reduced. If it is a reinforced concrete wall, the impact will be greater due to the absorption of electric waves by the conductor