The field of emergency management, especially high-risk industries such as petrochemicals and coal mines, places extremely high demands on the safety and reliability of communication equipment. As a “special equipment” to meet the communication needs of high-risk environments, explosion-proof walkie-talkies are becoming an indispensable tool in production safety and fire rescue with their unique advantages. It can not only provide stable and reliable communication guarantees in dangerous places such as flammable and explosive places, but also is a key tool to protect the lives of front-line personnel and ensure efficient and orderly emergency response.
Relying on its deep accumulation in the field of wireless communications, Lisheng Communications has launched the AP25 explosion-proof digital walkie-talkie, which provides a strong guarantee for the safe communication of these industries. Today, the Whale Accurate Evaluation Team of the Walkie Talkie World will take you to have a deeper understanding of this excellent domestic terminal.
One-piece molding process, strong and durable, good feel
According to the evaluation habit, we will first take you to briefly understand the AP25 explosion-proof digital walkie talkie (hereinafter referred to as “AP25 explosion-proof walkie talkie “) of Lisheng Communication from the perspective of appearance design. The AP25 walkie talkie weighs about 355 grams and measures 147.56341.7mm. The body design is extremely compact and adopts ABS+PC aluminum-plastic integrated molding technology, eliminating seams and connection points, making the structure of the walkie talkie more solid, greatly improving the equipment’s resistance to drop, pressure and wear. At the same time, the product has an outstanding texture and is comfortable to hold.
Back to the AP25 explosion-proof walkie talkie itself, the front design of the body is simple and practical, with a 2.4-inch color TFT LCD screen, which is a semi-transparent and semi-reflective high-brightness color screen with a wider viewing angle range, which can support a viewing angle of about 160° horizontally/150° vertically, so the screen content can be clearly seen even in strong light conditions outdoors. The actual measurement shows that the screen display is very clear under direct sunlight. The function keys use the classic nine-square physical key layout, with raised keycaps and a stepped drop design, which can be accurately operated even with gloves, which is very practical for users in industries such as chemical industry.
The AP25 explosion-proof walkie-talkie is equipped with a blue-green PTT button on the left side, which is comfortable to touch and has clear feedback. It is supplemented by two programmable multi-function buttons for quick channel switching and other operations. There is a dedicated interface for explosion-proof audio and frequency writing on the right side. The top integrates an antenna and an orange emergency alarm button to improve emergency response speed. The back design is relatively simple, and the battery can be quickly installed. At the same time, a battery buckle is added to lock the battery to prevent it from detaching from the host. In addition, in order to increase the holding experience of the device, the AP25 explosion-proof walkie-talkie uses an anti-slip material to ensure a stable grip in various environments.
The AP25 explosion-proof walkie talkie supports multiple communication modes such as analog, DMR, PDT, NXDN, etc. It is suitable for domestic PDT digital trunking systems and is also compatible with existing analog, DMR or NXDN systems to meet communication needs in different scenarios. Especially in emergency rescue scenarios, its multi-standard design significantly improves the adaptability and flexibility of the equipment.
The frequency range supported by the AP25 explosion-proof walkie talkie includes 136-174MHz, 350-400MHz, 400-470MHz, and 450-520MHz. In terms of output power, it supports 3W high power and 1W low power transmission, which provides flexible use options for the walkie talkie. High power can communicate at a longer distance, while low power can save power.
In terms of sensitivity, the AP25 explosion-proof walkie talkie has an analog sensitivity of 0.18μV (typ.) (FM@12dB SINAD) and a digital sensitivity of 0.20μV (typ.) @5% BER, which enables it to maintain clear communication in a weak signal environment. Such sensitivity performance is at a higher level in the industry standard.
The AP25 explosion-proof walkie talkie has two built-in vocoders, AMBE and domestic NVOC, which support flexible switching through software. It can access the PDT network through the PDT standard + NVOC vocoder combination, and can also access the standard DMR network through the DMR standard + AMBE vocoder combination. This dual vocoder configuration can switch networks autonomously without changing the device, providing users with a flexible networking strategy and significantly improving the applicability and practicality of the AP25 explosion-proof walkie talkie in different application scenarios.
The AP25 explosion-proof walkie talkie supports Bluetooth 5.0 standard access, Bluetooth frequency writing and Bluetooth call functions, improving communication safety and efficiency in high-risk environments. By connecting an explosion-proof certified Bluetooth headset, users can operate with both hands freely without holding the device, avoiding safety hazards caused by distraction.
The AP25 explosion-proof walkie talkie supports local recording function, which can record and store voice conversations during the walkie talkie in real time in the device. This function provides key evidence in emergencies and supports subsequent investigations and analysis.
In terms of battery life, the battery capacity of the AP25 explosion-proof walkie talkie is 3500mAh. According to the industry standard test method 5-5-90 (i.e. 5% transmission signal, 5% reception signal, 90% standby), it can last for 19 hours in analog mode and 23 hours in digital mode, which can fully meet the various usage scenarios of industry users.
The AP25 explosion-proof radio is IP68 dustproof and waterproof. This design ensures that the AP25 can operate stably in dusty, humid or underwater environments, making it very suitable for harsh working conditions such as petrochemicals and mining. To this end, we verified the waterproof function. In the experiment, the AP25 radio was placed in flowing water for a period of time to simulate its use in extreme environments. After the experiment, the radio was taken out and tried to communicate, and the results showed that the function was completely normal.
AP25 walkie talkie voice communication test
In order to verify whether the AP25 explosion-proof walkie talkie can meet the communication needs of users in actual use scenarios, it is necessary to conduct detailed tests on its communication effect and distance. This test can not only verify the communication performance of the walkie talkie in a variety of environments, but also provide important references for potential customers when selecting models.
The AP25 explosion-proof walkie talkie is designed with two transmission power modes, 3 watts and 1 watt. In order to evaluate the maximum communication capability of the walkie talkie, we will use the 3-watt high-power mode for testing in order to achieve the best communication effect. To this end, we designed two scenarios, one is to conduct a cross-floor signal penetration test, and the other is to conduct a distance test in a complex urban environment.
Scenario 1: Floor signal penetration test
For this scenario test, we chose Nanjing IFC Center to conduct the floor signal penetration test. One tester held an AP25 walkie talkie fixed on the 7th floor, and another tester moved around the building with another walkie talkie. During the movement, the testers continued to make calls to simulate the communication needs in actual use. The final test results showed that when the transmission power of the AP25 explosion-proof walkie talkie was set to 3 watts, without relying on any additional equipment, the signal penetration was sufficient to penetrate the obstacles of 5 floors. This achievement highlights the reliability and practicality of the AP25 explosion-proof walkie talkie in complex building structures.
Scenario 2: Urban road environment zoom test
We took IFC as the starting point, and two testers each held an AP25 explosion-proof walkie-talkie and began to move in the opposite direction along Jiangdong Middle Road to test the communication distance at a transmission power of 3 watts. Jiangdong Middle Road is an expressway in Hexi New City and the central axis of Hexi New City, with ten lanes in both directions. There are many high-rise office buildings and commercial centers on both sides of the road, which is the top business district focused on by Nanjing Hexi CBD.
During the entire test, the two testers needed to communicate continuously to test whether the signal was smooth, and recorded the longest distance that the signal could be maintained without the assistance of additional equipment. The final test results showed that the walkie-talkie had signal loss at a distance of about 5 kilometers between the two parties, which means that the longest communication distance of the AP25 explosion-proof walkie-talkie in this test was 5 kilometers. This result is of great reference significance for evaluating the actual application value of walkie-talkies in relatively complex urban environments. The actual test location can be seen in the map information in the figure below.
During the preparation of the voice test, we also paid special attention to a detail of the AP25 explosion-proof walkie talkie. Usually, walkie talkies are prone to howling when operated at close range, and the effect of handling this problem can often directly reflect the technical strength of the manufacturer. This time, we conducted a close-range operation test on the AP25. As you can see from the video, the performance of the AP25 is amazing: even when the two walkie talkies are so close, there is almost no howling sound, which undoubtedly demonstrates its excellent technical optimization and excellent audio processing capabilities.
Disassemble the machine! See why it is explosion-proof
The AP25 explosion-proof walkie talkie is an IIB-level explosion-proof walkie talkie designed based on “intrinsic safety”. The explosion-proof marks are: Ex ib IIB T4 Gb; Ex ib IIIC T130℃ Db. It is specially designed for high-risk environments such as petrochemicals and mining. It has passed strict explosion-proof certification to ensure that when used in an environment containing explosive gas or dust, it will not cause sparks or thermal effects due to equipment failure or improper operation, thereby avoiding the risk of explosion.
After disassembling the machine, we can see that the AP25’s circuit board layout is compact, the functional modules are highly integrated, and the overall design is very sophisticated. The circuit design strictly controls the current, voltage and power to ensure that no energy sufficient to ignite explosive gas is generated under normal working and fault conditions. At the same time, the core components are all designed with a shielding cover to protect key circuits from high-frequency electromagnetic interference, improve electrostatic immunity, and isolate the magnetic field in a high-intensity magnetic field environment.
This all-round protection design allows the device to maintain stable communication performance even in extreme temperature, high humidity and dusty environments, making it an ideal communication tool for high-risk scenarios such as firefighting and emergency rescue.
Beidou Positioning: Autonomous and controllable navigation technology
In the actual evaluation, the Beidou positioning function of the AP25 explosion-proof walkie-talkie is eye-catching. It supports GPS/Beidou II dual-mode positioning, and especially with the support of the Beidou module, it completely gets rid of the dependence on foreign navigation systems, showing its independent and controllable hard-core strength. Even in extreme scenarios where GPS is restricted, single Beidou positioning can still accurately lock the position.
In the field test, the AP25 quickly searched for satellites, accurately positioned, and responded within seconds the moment it was turned on. Its positioning information page intuitively displayed key data such as longitude and latitude, altitude, heading, and speed, making it easy to see at a glance. The anti-interference ability of the Beidou system is a plus.
Falling alarm to ensure personnel safety
In firefighting and emergency rescue scenarios, the man-down alarm function is a key configuration of explosion-proof walkie talkies, especially at fire scenes or complex environments, where rescuers may fall to the ground due to thick smoke, obstructed vision, or sudden danger. At this time, this function can automatically send an alarm to the command center or other personnel to ensure that support is obtained in the first time. The man-down alarm function of AP25 performed well in actual tests, with quick response, which can significantly improve rescue efficiency and the safety of operators.
Summary
The AP25 explosion-proof walkie talkie launched by Lisheng Communication has become a leader in the field of communications in high-risk industries with its excellent design and performance. It adopts aluminum-plastic integrated molding technology, has excellent drop resistance, pressure resistance and wear resistance, and supports multiple communication modes to meet the needs of different scenarios. Its IP68 dust and water resistance, high sensitivity, dual voice coder configuration and Beidou positioning function enable it to perform well in harsh environments and emergency rescue. The fall alarm function provides a strong guarantee for the safety of front-line personnel.
The AP25 walkie talkie not only demonstrates innovation in technology, but also provides solid communication support for safe production and emergency rescue in industries such as petrochemicals and mining with practicality and reliability. It is an excellent representative of domestic explosion-proof walkie talkies.