Wireless rf Ethernet Transceiver TDD-COFDM Full Duplex

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Item specifice:

Brand Name: Safe Guard Model Number: SG-TDD20 Modulation: TDD_COFDM, time division duplex mode
RF power: 20W RF bandwidth: 4/8MHz Baud rate: 7200 ~ 921600bps (adjustable)
Correction mechanism: 32bit of CRC, ARQ Encryption: 128bit AES (Optional 256bit AES) Dimension: 210 * 133 * 54mm
Weight: 2.5kg Customization: All features can be changed as your prefer!

Product Description:

Model: SG-TDD20

TDD-COFDM is our new NLOS(non-line of sight) two-way data transmission system and wireless mobile emergency communication private network, which is independent of telecom operators wireless network. Its confidentiality, security, mobile performance that is better than Telecom operators. Also is a fully transparent data encryption transmission emergency security network.

Wireless rf Ethernet Transceiver TDD-COFDM Full Duplex

TDD-COFDM multiplexing technology to channel resources in time through time slot, frequency through a large number of sub carriers to flexibly allocated to multiple users, and in a single frequency to maximize the realization of multi user access. Channel into the AES128bit, and user manually customize key that strength to ensure the data encryption. System occupy relatively narrow-band air frequency(4/8MHz)and strong anti-multipath interference ability to overcome simulation technique and the high-speed mobile data transmission under multipath reflections and nuisance caused by occlusion, then achieved in a complex environment transfer: data packing form, audio and video data, serial asynchronous data, Miniature volume, precision design, lightweight and easy to carry that commonly used in short distance high speed wireless data transmission and on air long distance high speed wireless data transmission purposes.

Wireless rf Ethernet Transceiver TDD-COFDM Full Duplex

Main Features

+ Support protocol PTP &PMD network technology;
+ Support non-line of sight(NLOS) high speed mobile transmission
+ Bit rate can up to 921600bps;
+ AES 128-bit encryption, and also customer manually customize the secret key.
+ Standard RJ45 Ethernet and RS485/RS485/RS422 data interfaces;
+ Built in with small LCD screen that shows the signal working status. 
+ Available frequency: 330-430MHz/ 430-530MHz, or 2.4GHz (option). 

Product Parameters

Physical interface section


Standard RJ-45

RS-232/422/485 data

Two or Three pin terminals

Power supply

DC12V, Four pin terminals

RF connector

SMA female

Main parameters:


TDD_COFDM, time division duplex mode

Working mode

Full duplex

Working frequency

330-430MHz/ 430-530MHz,or 2.4GHz (option). step in 1MHz  

other frequencies can be customized

RF power


RF bandwidth


Correction mechanism

32bit of CRC, ARQ

Transfer Protocol

standard TCP / IP, transparent transmission,serial asynchronous

Data Rate

6.5Mbps ( both video and data occupy the same channel)

Baud rate

7200 ~ 921600bps  (automatically assigned)

Data type

10 / 100Bate-T Ethernet, RS-232, RS-422, RS-485 standard

Audio channel

analog audio intercom interface (non-Open)



Receiving sensitivity


Networking format



128bit AES (Optional 256bit AES)


10 / 100BaseT, Auto-MDI / X, IEEE802.3


Parameter Control

adjustable parameters through the LCD panel

Built-in battery

12000mA or remove

Working time

6 hours

Working temperature

-40 ℃ ~ 85 ℃


210 * 133 * 54mm



About our specification:

1. Advancement: TDD-COFDM channel modulation technology, support fast-moving, ultra-wide band, and fully transparent transmission.
2. Security: private network, private communication transport protocol, sole synchronization code and AES encryption.
3. Flexibility: transparent transmission of IP data channel, supports multi-user access.
4. Scalability: all-digital network, is compatible with all IP data transmission equipment.
5. Technical performance:
- Multi-frequency network base stations, single base station same frequency network, the same frequency network with bidirectional communication, high spectrum efficiency;

- Flexible allocation of channel resources to achieve PTP, PTMT and multipoint-to-multipoint two-way communication;

- Multiple channel bandwidth and a variety of modulation mode function;

- Flexible TDD slot allocation model to meet a single-frequency but multi-user access, not only save the spectrum but also to reduce power consumption;

- Spectrum sensing, perception slot, upstream bandwidth sensing function;

- Strong diffraction ability and anti-multipath capability

- High-sensitivity receiver. When receive level is -110dBm, can still ensure BER<10E-5 and frame error rate <1%. Powerful error correction capability;

- Low PAPR, high power amplifier efficiency, low power consumption;

- Can transmit video audio and etc signals synchronous,high speed.Velocity >600km/h.

- Digital signal processing, a strong system of confidentiality, stability and reliability.

Product Application

As its Miniature volume, precision design, lightweight and easy to carry, suitable used in short distance and long range air high speed wireless video data transmission purposes. Such as UAV, rotorcraft, micro UAV, drone,UGV, unmanned powered parachute, unmanned underwater vehicles boats, Fire-fighting robot,unmanned ship, airship, USV, high iron, EMU, unmanned vehicles, unmanned vehicle and etc..data transmission.

Our Services

One year free warranty;
Three months for free spare parts (Replacement parts will be charged after a year);
24-h technical guidance;
One-stop ODM/OEM solution;
We provide professional system design and construction;
We have over 15 years experience's study, design and manufacturing in wireless microwave transmission area;
We are the professional plant source,so we can provide you high quality in best price.

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Q:What are the grades of security monitoring enterprises?
Security qualification is divided into grade one qualification, level two qualification, grade three qualification and undetermined grade, and some provinces have no undetermined rank. Among them, the undecided level is the lowest level, and the enterprise qualification evaluation is carried out in accordance with the principle of gradual promotion.
Q:Why security system is better than the Chiwei AI Tai?
Video security monitoring system, entrance and exit control system, explosion-proof security inspection system
Q:Every day, mainly engaged in monitoring and installation, there are other security products
Do not have to become a wealthy businessman, the security will be more and more, the computer age, monitoring purposes will be more and more widely
Q:Security engineer and security system integration engineer
The security engineer is wider, including security product engineer, security system integration engineer, security engineer, design engineer, security system, security maintenance engineer, security engineer, security maintenance engineer, security management engineer, assistant engineer and other types of security.
Q:Consult the product that I buy, can you do monitoring?
You imagine, computers only work as video processing and video recording, and video rates are very low. Isn't there any old simple computer that's all right? Why bother doing that?.General use, or with mature proprietary products, at least do not bother software problems. Embedded system specific devices contain almost all of the required performance requirements of monitoring, especially reliability. Why can't we get out of the computer circle?
Q:Security surveillance camera, the camera's 60 shell and 90 shell difference
60 and 90 are the diameter of the shell, and the 60 case is much smaller than the 90
Q:What's the outlook of the security industry?
Surveillance lens and storage developmentSurveillance camera seriesAnalog technology video camera of the 70-80: transistor technology, camera, resolution of about 480 lines, basically no digital technology;Analog technology in 80-90, solid chip camera: CCDCMOS camera, the initial resolution of about 380 lines, gradually increased to 510 lines;90-00's IP digital camera with video server: early video encoding for the IP signal, the subsequent development of IP camera based on IP technology, the total number of pixels is about 300 thousand - 450 thousand, equivalent to about 480 line camera.00-10 HD applications: HD IP cameras, based on high-density CCD technology. The total prime number is about 1 million 300 thousand - 2 million;10- digital analysis technology: ultra high definition IP camera, embedded into video analysis, with early warning function, face recognition, object position identification and other digital security cameras;
Q:What subsystems does security include?
A complete security system is often composed of many subsystems. According to the relationship between the whole and the local, it is necessary to understand the subsystems of security. We don't care about the deep level. Let's see what subsystems are available for the moment.
Q:General security monitoring, construction costs accounted for the total amount of equipment?
Reasonable profit is about 15%. The main purpose of the business is to talk about the business, not to scare customers away. Of course, the customer is the boss your brother-in-law said, your brother-in-law when construction costs at 50%, he had to pinch your nose swallow
Q:What are the security devices?
But according to the customer's different requirements and purposes, can be extended to a large number of equipment: magnetometer, button, alarm, alarm center, telephone line. The front end probe can be divided into active infrared, passive infrared, smoke sensing, air feeling, vibration probe, temperature sensing, glass crushing and so on

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