The police walkie-talkie, also known as the police wireless walkie-talkie, is specially equipped and designed for the eight departments of the public security bureau, the procuratorate police, the court police, the judicial bureau police, the security bureau police, the customs anti-smuggling police, the army and the armed police officers and soldiers. Contact the walkie-talkie. In order to ensure the safety of the communication services of the above special departments, the national radio management department has specially planned several groups of frequencies for their use. The frequency range is from 350MHz to 390MHz, and the 350MHz to 370MHz is mainly used for the public security system. This frequency line is called the low end of 350MHz. 370MHz~390MHz is used by other departments, and this frequency is called the high end of 350MHz. This type of walkie-talkie is collectively referred to as 350MHz police walkie-talkie.


 

1. Brief introduction

Due to the particularity of the police service, its working environment, usage requirements, and the nature of its communication service are still different from other ordinary walkie-talkies. In addition to good reliability and durability, police walkie-talkies are also required to have powerful functions, superior performance, strong and sturdy, shock-proof, shock-proof, lightweight, easy to use, large battery capacity, and long standby time. The department also has special requirements, such as the need for communication security technology, and the best security technology in the market includes cloud intercom, digital intercom, etc.

 

2. the history of the development of police walkie-talkies

Japan Synergy Communication Manufacturing Co., Ltd. produces FG809 portable radio, FG808 mobile radio and other products of KG series such as KG105, KG107, KG109, KG106 and KG110 repeater.

The GW series police walkie-talkies of Japan ICOM company are like GW1 arm-held walkie-talkie, GW100 mobile radio and GR8520 repeater.

Kenwood's TK series police walkie-talkies, such as TK348, TK808 and TKR820 repeaters, were adopted by the public security system earlier.

However, in the police walkie-talkie, the ones with a large amount of use, strong influence, complete specifications and many varieties are the products of the American Motorola Company.

Kenwood has TK348, TK388, TK3107, TK388G in handheld walkie-talkies, TK808, TK868, and TK868G in mobile radios, and TK820, TK828, and TK850 in repeaters. In contrast, Motorola Systems entered the police walkie-talkie market relatively late, and launched the GP688 police walkie-talkie to the domestic market in August 1997. Well-known brands have introduced North American-style police walkie-talkies into the Chinese market and have successively developed GP688, GP300, GP328/338, GP2000, HTP700 and other handheld police walkie-talkies, GM300, GM950, MTH700 and other police mobile radios and GB300 police The use of repeater stations has become a strong brand in today's police walkie-talkies, occupying most of the medium and high-end police walkie-talkies. In 2013, Motorola Systems released MTP3000 series TETRA handheld walkie-talkie products.

Among the police walkie-talkies, there are HX260, HX290 portable radios and GX1608 from Japan's Marantz brand, DR330 mobile radios from Japan's Trancom.


 

3. Classification of police walkie-talkies

Police walkie-talkies are divided into conventional communication and trunking communication. In conventional communication use, it is divided into use in private communication network and use in non-network.

In the trunking communication, it is also divided into the trunking system of MPT1327 signaling and the trunking system of other standards. The number of police walkie-talkies used in the public security system is the largest. The use of police walkie-talkies in the public security system must pass the network access detection of the walkie-talkies of the Ministry of Public Security and meet the requirements of the Ministry of Public Security's "Police Mobile Communication Network Police Automatic Level Specification", such as CPSX numbering plan, dynamic reorganization function, alarm function, one-key start, etc. The trunking walkie-talkie must comply with the MPT1327 signaling standard, and be suitable for the CPS-X and MPT1343 dialing methods of the Ministry of Public Security.

The trunking walkie-talkie should not only be used in the trunking system, but also be easily switched to the conventional channel mode for use, that is, it has the off-network function. Off-net means that when short-distance simplex communication or beyond the coverage of the system, the off-net function (temporarily leaving the trunking system) can be used to talk directly with other mobile stations.


 

4. The nature of police walkie-talkies

With the development of society, the workload of the public security system has increased greatly compared with the past. As an important part of public security command and dispatch, higher requirements have also been put forward. Under normal circumstances, local police use walkie-talkies as the main communication tool when dealing with daily affairs. However, what is the difference from ordinary civilian use?

In addition to the features such as range, when the features are mentioned, people generally think of requiring more functions. However, in practical applications, many functions are rarely used, only the intercom function is the most used, the primary feature of police walkie-talkies It is the reliability of the communication, that is to say, the establishment of a call and the quality of the voice are the primary factors. On this basis, the following performance requirements of the point walkie-talkie should be considered.

• Strong and durable. Due to the particularity of police work, some unexpected situations are often encountered, such as collisions, falls, etc., so whether the walkie-talkie is durable is the primary consideration.
• Waterproof. Special police, traffic police and other departments, due to the particularity of their working environment, such as patrolling in rainy days, checking vehicles and other work in bad weather or in specific environments, such as launching rescue work, all of which put forward high requirements for the waterproofness of walkie-talkies .
• Special requirements of fire department and other departments. The walkie-talkies of fire departments and other departments require explosion-proof resistance, high temperature resistance, waterproof, easy to carry, and do not occupy hands. These are mainly related to the particularity of firefighting work. For example, the explosion-proof feature ensures that the machine can be used normally under the condition of high temperature in the fire scene; waterproof is because a lot of water will be used in the rescue work of the fire scene, which will inevitably wet the walkie-talkie; and it is convenient to carry because the firefighters themselves carry some fire fighting. The walkie-talkie should have a special wearing clip to wear it on the body, which is easy to operate, and the voice quality will not be affected by the complex environment and location of the fire field.
• The volume should be small. The particularity of the work of some departments in the police system requires the walkie-talkie to be small and easy to conceal.
• The operation should be convenient, simple and clear. In fact, the powerful walkie-talkie has another weakness, that is, the operation is complicated. In order to achieve more function choices, it will inevitably lead to too many selection menus, and in the time application of police work, most of them use its intercom function. Of course, data transmission cannot be left behind.

 

5. the basic matching of police walkie-talkies

For police communication, the use of it is relatively common, and the daily scheduling work is basically realized through the walkie-talkie. This requires that the walkie-talkies equipped by police officers not only have clear calls, but also have a long battery life. But on the other hand, due to the particularity of police work, the walkie-talkie is required to be basically in working condition 24 hours a day. So under normal circumstances will be equipped with a backup battery.

Antenna, the common phenomenon of the antenna is that the external rubber surface is aging and broken, and the compatibility with the interface of the walkie-talkie is poor, and it is not easy to tighten. Another situation is that the core wire of the antenna is broken, resulting in poor reception and transmission of the walkie-talkie.

As for the charger, the special charger will make the police walkie-talkie battery fully charge every time the walkie-talkie is charged.

In terms of earphones, shoulder marks, battery back clips, etc., due to the particularity of the use environment and method of police walkie-talkies, taking earphones as an example, head-worn, vacuum voice catheter earphones, and throat-shock earphones are convenient for police staff to choose.


It can be seen that high-quality accessories are also a key factor for use.



source:pttcn.net