What frequency does the security walkie talkie generally use?

Two approaches. 1. Frequency meter.

url], gray is. Within a few meters of the station, as long as the station is transmitting, it can quickly capture the radio station's transmitting frequency. More than 200 RMB, it seems that there is a cheaper one.

2. Use the scanning function of the radio station, but you must press and hold the transmit button of the security radio station for a long time, generally search between 410-430 440-470, and you should be able to find it. It is also not ruled out that they occupy 430-440.

The above is perfect! The first one is less practical for you.

<> walkie-talkie for security guards.

Walkie-talkies are indispensable communication equipment for security personnel, whether it was, is or will be the same.

Considering the particularity of the security work, the walkie-talkie used by the rubber game must have: good signal, easy to carry, anti-drop and durable, affordable and so on. Therefore, we can choose from the following points.

1. There are often some emergencies in security work, which are easy to cause physical collisions, so it is recommended to choose a walkie-talkie without a screen and keyboard and more resistant to falling.

B15 professional FM commercial walkie-talkie, the shell is made of PC+ABS material, the protection of the whole machine is increased by 30%, which meets our professional communication needs to grasp the overall situation, and is a very good security walkie-talkie.

2. At present, the main sales in the market are walkie-talkies in frequency bands such as 400-420MHz and 450-470MHz, as well as walkie-talkies in the full range of 400-470MHz. The versatility of the full-section machine is relatively strong, so it is still recommended to buy the full-section. Ruimu B12, B15, B15-PLUS and other machines are full-segment walkie-talkies.

3. Since the security industry usually works for a long time, it is very necessary to have a walkie-talkie with a good feel to reduce hand fatigue.

4. The security industry usually requires the confidentiality of the call content, so the walkie-talkie must also have the call confidentiality function.

Digital walkie-talkie B15-plus, 2 meters of seismic and drop resistance, support digital-analog compatibility, digital encryption and other functions, is a very practical security walkie-talkie.

5. The security work is mostly in the environment of dense buildings and high noise, so the walkie-talkie must have the characteristics of long call distance and strong anti-interference ability.

6. At present, the domestic walkie-talkie is basically maintained at about 300-600, and there will be certain differences between different brands and walkie-talkies with different performance, which can be selected according to their actual needs. Of course, there are more than 100 beams on the market, the communication distance is relatively short, and it is not durable, and the quality of the stove is not guaranteed, so it is recommended not to buy.

1.It is best for security guards to use walkie-talkies without screens and keyboards, walkie-talkies without screens to withstand falls, and there is nothing else to pay attention to.

2.Generally, the walkie-talkies sold on the market are 400MHz full-section walkie-talkies, (there are also -470 machines) The full-section machine is highly versatile, it is recommended to buy the full-section! It's 400-470mhz.

3。At present, the domestic walkie-talkie is basically maintained at about 350 (there are more than 100 of them, the quality is too poor, not durable, it is best not to buy.) **Control it at about 300-500, the machine at this price is relatively durable.

I'm a radio amateur, and the machine I'm using is not suitable for you, and the functions are too complicated in every way. Moreover, the general unit may not be able to accept it, and it is an imported machine of more than 1,000 yuan. If you have the strength, you can buy Motorola 338, which is sturdy and durable, multi-functional, and compatible with many communication methods, **less than three thousand, I have not had a failure for a year.

The above is my personal experience, and you still need to choose the specific model!

The walkie-talkie used in the city is best between 400-470MHz (U-section) and 136-174MHz (V-section).

The intercom talk distance is related to the environment in which the intercom is used. The electromagnetic wavelength of the U V section machine is different, and the loss during transmission is also different, due to the large number of buildings in the city, it is relatively better to use the U segment (400-470MHz) walkie-talkie; If the environment is relatively empty, such as the sea, wilderness, etc., the V-segment (136-174MHz) walkie-talkie is relatively good.

Hello, the professional term of the walkie-talkie in the 409 megaband is "public walkie-talkie", and the public walkie-talkie refers to: the transmission power is not greater than, works at the specified frequency and is approved by the state for wireless walkie-talkie.

The following is a brief description of the parameters of the public walkie-talkie, etc.:

1. Working frequency (unit: MHz): a total of 20 frequency points).

2. Modulation mode: F3E

3. Effective transmit power (EIRP):

4. Transmit frequency tolerance: <+5ppm

5. Transmitter stray radiation: <50uW

6. Receiver stray radiation: <20nW

7. Channel spacing:

The transmission power of this machine is small, the actual call distance in the city is 100-500 meters, and the plain is more than 2 kilometers, so it needs to use 3 No. 7 or No. 5 batteries.

Let's talk about the walkie-talkie of lithium batteries you said.

No matter what battery nickel-metal hydride lithium-ion nickel-cadmium and so on, this kind of walkie-talkie is collectively referred to as civilian walkie-talkie, of course, the public walkie-talkie also belongs to the category of civilian walkie-talkie, which is divided into commercial aircraft, amateur machine, professional machine, etc., among which the amateur machine is not a machine amateur, but belongs to the most and most complete functions in the walkie-talkie with on-screen keyboard for amateur radio enthusiasts, professional machines are usually black without a screen two knobs 16 channels. Among them, there is not much gap between professional aircraft and commercial aircraft, but commercial aircraft are mostly used in hotels and hotels, etc., and real professional machines are used in railways, petroleum exploration and other fields.

The UHF frequency band 400-470 originally included the commercial segment, the amateur segment, the aviation segment, etc., and now the state has announced the withdrawal of the 450-470 frequency band, and will not approve the frequency band for any commercial and individual machines, and 430-440 is the amateur band.

As for the nonsense that some black-hearted businessmen say is not illegal and used casually, I think there should be no need to say more, I will only take one sentence to explain, according to the relevant provisions of the "Radio Administration Regulations of the People's Republic of China", all walkie-talkies (including car radios) that have not been approved by the radio management department, have not handled radio licenses, have not worked according to approved parameters, and have not been approved by the model (including car radios), are all illegal walkie-talkies.

Let's talk about this first, and if you have any questions, please continue to ask.

Civil walkie-talkies now have U-V dual-segment, U-segment (, V-segment (U-segment penetration is good, and V-segment attenuation is reduced.

These 2 segments are legitimate for amateur use, and none of the others can be used personally.

Police, aviation, navigation, forestry and animal husbandry, insulation and other state functional organs are not allowed to use the frequency bands, because you will accidentally interfere with them and affect their normal work. And the average enthusiast of this type of band can't afford it, and if you can afford it, you can't play with everyone.

Playing civil is playing civilian, the transmission power of the gods are all false standards, a few hundred dollars to buy an analog signal walkie-talkie, by the mountains, forests, buildings are greatly affected. If you spend thousands of dollars to buy digital signals, you can have a better time, but there will be obstacles to communicating with others.

If you want to listen to a lot of frequencies, don't use a walkie-talkie, go to the radio, and you can play the car station when you get started. If the handheld walkie-talkie does not have the cooperation of the relay, it is difficult to overtake the signal more than 2 kilometers away.

If you use it on board, buy the band 136-174. If you use it on the ground, you can buy -470, but don't buy it for police. They are 350-390 and are not recommended for the police

Between 350MHz and 390MHz.

Different departments use different frequencies. In order to ensure the security of the communication services of the above-mentioned specialized departments, the state radio administration has specially planned several sets of frequencies for its use, ranging from 350MHz to 390MHz.

Its 350MHz 370MHz is mainly used in public safety systems, and this part of the frequency is called the 350MHz low end in the line.

Between 350MHz and 390MHz.

In order to ensure the security of the communication services of the above special departments, the national radio administration department has specially planned a number of groups of frequencies for its use, with a frequency range from 350 to 390MHz.

Its 350MHz 370MHz is mainly used in the public security system. This segment of frequency is referred to as the 350MHz low end in the line.

370MHz 390MHz is used by other departments, and this frequency segment is called the 350MHz high end in the line. This type of walkie-talkie is collectively known as 350MHz police walkie-talkies.

Each frequency attributes, public security: 350mhz, coast: 220mhz, amateur:

433MHz, Cluster: 800MHz, Mobile: 900MHz, Radio:

85-120MHz, TV: 100-800MHz.

The frequency bands opened up by China are 144 146MHz and 430 440MHz, and countries around the world generally have this frequency band. In October 2001, the Ministry of Information Industry and the State Radio Administration issued the "Radio Frequency Plan of the People's Republic of China", which has a description of amateur radio amateurs: "Amateur service: radio communication service for amateur radio amateurs to conduct self-training, mutual communication and technical research.

Police wireless walkie-talkie is a walkie-talkie specially designed for the public security, procuratorate, court, justice, security, customs, military, armed police eight departments to carry out wireless communication business contact. In order to ensure the security of the communication services of the above-mentioned special departments, the national radio administration department has specially planned a number of groups of frequencies for its use, with a frequency range of 350 390MHz, of which 350MHz and 370MHz are mainly used in the public security system. This segment of frequency is referred to as the 350MHz low end in the line.

370MHz 390MHz is used by other departments, and this frequency segment is called the 350MHz high end in the line. This type of walkie-talkie is collectively known as 350MHz police walkie-talkies. Due to the particularity of the police business, the working environment, the use requirements, and the nature of its communication service are still different from other ordinary walkie-talkies.

In addition to good reliability and durability, it is also required that the police walkie-talkie should be powerful, superior in performance, strong and sturdy, shockproof, impact-proof, lightweight, easy to use, large battery capacity, long standby time, and some departments also have special requirements, such as communication confidentiality technology.

Beijing police use 800m cluster FM intercom.

The frequency band of the walkie-talkie used by the traffic police is 350MHz

400-470MHz taxi frequency.