The working principle and function of wireless transmitting and receiving module

1,647 Published by xia, Crystal Feb 20,2019

Want create site? Find Free WordPress Themes and plugins.

The wireless transmitting and receiving module is engaged in digital audio wireless transmission, wireless data communication, wireless transmission system, wireless remote control and telemetry system, wireless data acquisition system, wireless network, wireless security system, etc., wireless transceiver circuit design has always been a bottleneck in wireless applications. The wireless transceiver module integrates the functions of the high-frequency key-control transceiver circuit to realize high-speed data transmission with a small size and lower cost. The following explains the working principle and function of the wireless transmitting and receiving module.

Wireless transmitting and receiving module YET215 application.

The receiving module corresponding to the wireless transmitting module is commonly used in two types: super-regeneration receiving and super-heterodyne receiving.

1. Super Regenerative Detection Receiver

The super regenerative detection circuit is actually a high frequency oscillator controlled by intermittent oscillation.?This high frequency oscillator uses a three-point capacitor oscillator, and the oscillation frequency is consistent with the emission frequency of the transmitter. The intermittent oscillation is generated during the oscillation of the high-frequency oscillation, which in turn controls the oscillation and the pause of the high-frequency oscillator.?The frequency of the intermittent oscillation is determined by the parameters of the circuit (generally from one hundred to several hundred kilohertz). This frequency is selected low, the circuit has better anti-interference performance, but the receiving sensitivity is lower. Conversely, the frequency is selected higher, the receiving sensitivity is better, but the anti-interference performance is worse. The super-regenerative detection circuit has a high gain. When the clamp signal is not received, due to the interference of external spurious signals and the thermal disturbance of the circuit itself, a unique noise is generated, called super noise, and the frequency range of this noise. It is between 0.3 and 5 kHz, which sounds like a “sand” sound like water. When there is no signal, the super noise level is very high, and the noise voltage is output after filtering and amplification; when a clamp signal arrives, the circuit resonates, super noise is suppressed, and the high frequency oscillator starts to generate oscillation and output signals.

2. Superheterodyne Receiving Detection Receiver

The principle of the superheterodyne receiving circuit is the same as that of the general superheterodyne radio. It amplifies the received signal and subtracts it from the equal-amplitude oscillating signal generated by the unit to generate a fixed-frequency IF signal. The amplitude of the IF signal includes a low-frequency modulated clamp signal, and the IF signal is added. Two-stage or three-stage amplification, and then detection, the low-frequency command information contained in the intermediate frequency signal is taken out, and the correct remote signal is obtained. Since the IF amplifier is equipped with an automatic gain clamp loop, its gain can be designed to be very high and the operation is very regulated, which makes the superheterodyne receiver basically the same for both strong and weak signals. Magnification, also because of the use of the IF amplifier, its signal amplification can be very large, which makes the receiving sensitivity of the circuit greatly improved, generally up to 0.1mV. Compared with the super-regenerative detection circuit, the super-heterodyne receiver module has a great improvement in both receiving sensitivity and selectivity, and is more significant in anti-jamming.

The three functions of the wireless transmitting and receiving module:

Wireless transmitting and receiving module YET215 application.

Function 1. A wireless communication network used to form a star topology. And it must be a multi-point star topology, and some extraordinary places require wireless communication. On the one hand, such a wireless transmitting and receiving module is inexpensive, and the cost of forming a star topology is relatively low; on the other hand, the wireless transmitting and receiving module can be modularized, small in size, easy to use, and easy to integrate. This kind of wireless transmitting and receiving module is very practical for wireless networks with low communication speed and close distance.

Function 2. For wireless multi-channel (parallel) control. For example, complex remote control robots require multi-channel (parallel) control in some locations. One method is to directly connect the decoder to the decoder, and then connect with the electronic components such as the relay to drive the subsequent controlled object; the other method is to connect the wireless receiving module and the single chip microcomputer, and then use the data after disposal. The MCU connects the electronic components such as relays to drive the subsequent controlled objects. Usually, a pair of wireless transmitting and receiving module can realize up to six parallel wireless control. If the required number of channels is greater than six, multiple pairs of transmitting and receiving modules can be used to work simultaneously to meet actual needs.

Function 3. For general-purpose serial port (RS232) wireless data transmission. There are usually many control instruments and equipment using serial port, and communication with these devices must meet the serial port requirements. Some extraordinary places, industrial control site. When it is necessary to use the wireless transmission method, it is natural to select the wireless transmitting and receiving module mentioned in this article.However, in this case, the communication method must be used. It is necessary to separately compile the corresponding software implementation file format at the transmitting end and the receiving end to achieve wireless communication. Purpose, if the communication system is full-duplex, it can be implemented by using two pairs of shooting and receiving modules.

The above is about the working principle and function of the wireless transmitting and receiving module, and it is hoped that it will be helpful to friends who need the wireless transmitting and receiving module.?Yaoertai?Technology focuses on wireless transmitting and receiving modules and sensor applications. The wireless transmitting and receiving module feature long range and high stability.

Did you find apk for android? You can find new Free Android Games and apps.

2019 China Shenzhen Public Security Expo!

Focus on security technology innovation and lead the development of AI industry. The 17th China I...

Do you like ? 3,691

Read more

Celebrate the 14th anniversary of Yaoertai !

On May 11, 2019, our company Yaoertai was founded 14th anniversary! In the past 14 years, we hav...

Do you like ? 3,512

Read more

2019, let’s go hiking together!

Saturday, the first week of work in 2019, On a sunny afternoon, Yaoertai, all business colleagues...

Do you like ? 4,614

Read more

The 28th Beijing Construction Expo will be held soon, and invite you to participate in the grand event!

The 28th China (Beijing) International Building Decoration and Materials Expo will be held on Mar...

Do you like ? 4,553

Read more

R+T Asia Shanghai Door and Window Sunshade Exhibition, the opening of the 2019 is coming soon

The 15th R + T Asia Shanghai Door and Window Sunshade Exhibition will be held from February 27th ...

Do you like ? 3,834

Read more

Difference between 433 remote control and 315 remote control and its code method

The frequency used by the radio remote control is 433Mhz or 315Mhz, also referred to as 433 remot...

Do you like ? 19,778

Read more

Infrared alarm principle, function and installation method

The infrared alarm can detect the infrared rays emitted by the human body, and is composed of an ...

Do you like ? 4,197

Read more

Congratulation YET Global Sources Electronics Exhibition bring to a successful close

Congratulation YET Global Sources Electronics Exhibition bring to a successful close Gate remote ...

Do you like ? 4,364

Read more
YET2018All Rights ReseverdTechnical Support´╝ÜBaiila