What kinds of walkie-talkies are there?

Compared with mobile phones, walkie-talkies have their own characteristics. In one-to-one and one-to-many directional special communication, it has the characteristics of establishing communication quickly, especially the one-to-many characteristics that ordinary mobile phones can't match. Walkie-talkies can be divided into eight categories according to their uses and occasions, namely professional walkie-talkies, commercial walkie-talkies, civil walkie-talkies, commercial walkie-talkies, explosion-proof walkie-talkies, railway walkie-talkies, police walkie-talkies and car walkie-talkies. Let's take a look at the brief knowledge of these eight walkie-talkies. 8 Function and scope of use of interphone

1, professional walkie-talkie

Professional walkie-talkie refers to the walkie-talkie with transmission power of 4-5W and frequency range of 136- 174MHz or 400-480MHz. The communication distance of this walkie-talkie is generally between 3 and 8 kilometers (depending on the specific environment). It is relatively simple to operate, because most professional walkie-talkies have no numeric keyboard, only two knobs to control the number of channels, power supply and volume switch. The disadvantage of professional walkie-talkie is that it is relatively large and heavy, but it is more prominent in waterproof, shockproof, anti-fall and anti-aging, and the performance of walkie-talkie is much more stable. Professional walkie-talkies are expensive and are generally used in construction engineering, property management and factory workshops.

2. Commercial walkie-talkie

Commercial walkie-talkie refers to a walkie-talkie with a transmission power of 0.5 4W and a frequency range of 400-480MHz. The talking distance of this walkie-talkie is between 800 meters and 8 kilometers (depending on the transmitting power of the walkie-talkie and the specific environment). Commercial walkie-talkies are light and beautiful. The walkie-talkie is tied to the waist through the belt clip of the walkie-talkie. Wearing headphones can free hands and improve work efficiency. Commercial walkie-talkies are as expensive as professional walkie-talkies and are generally used in shopping malls, supermarkets, retail, factories and manufacturing.

3. Civil walkie-talkie

Civil walkie-talkie refers to a walkie-talkie with a transmission power of 0.5W and no more than 1W and a frequency range of 409MHz. Generally, the communication distance of civil walkie-talkies is relatively short (3 kilometers empty), which is a nationally recognized wireless communication device and can be used without a license. Civil walkie-talkies are small and colorful, and the price is generally as low as 300-600 yuan, which is more suitable for personal business trips, tourism and restaurants.

4. Amateur walkie-talkie

Amateur walkie-talkie is a radio walkie-talkie specially designed and produced to meet the needs of amateur radio enthusiasts. This kind of walkie-talkie can also be called "playing computer". In view of this amateur personal radio service, all countries have opened up special frequency bands for amateur radio sports enthusiasts to use. China's open frequency bands are 144~ 146MHZ and 430~440MHZ, which are basically the same in the world. Amateurs only need to buy their favorite models and apply for a local radio network license, so they can talk to others. Countries all over the world are generally in this frequency band.

5, explosion-proof intercom

Among many brands of wireless walkie-talkies, there are not many brands with explosion-proof walkie-talkies, which are mainly used in coal mines, liquefied gas filling companies, oil depots, oil fields, petroleum, gas stations, chemicals, petrochemicals, coal mines, natural gas, chemical plants, flour processing plants, flax processing plants, coal processing plants and fire fighting.

6. Railway intercom

There is no doubt that the railway walkie-talkie is a special walkie-talkie equipment tailored by the walkie-talkie manufacturer according to the actual work needs of the railway and railway departments. The transmission power is 4-5W, and the frequency range is 440-470MHz. Generally, there are 2-4 function buttons on the front face of the railway interphone, which are used for communication selection in different environments of plains and tunnels, as well as switching between stations and locomotives. Due to the high noise of the train, the audio output of the intercom is very high. After voice compression, the voice quality of the intercom is clearer and crisper.

7. Police walkie-talkie

Police walkie-talkie is a special equipment for public security system, and its frequency range is 350-370MHz and 370-390MHz. No one is allowed to steal or embezzle the frequency resources of the walkie-talkie dedicated to the public security system in any way. Police walkie-talkies have many functions, most of which are keyboard-type. When purchasing a wireless walkie-talkie, pay attention to the fact that the transmitting frequency band of the walkie-talkie is mostly (400-420MHz, 450-470MHz) to avoid unnecessary troubles.

8. Car intercom

At present, the working voltage of car interphone is 12.5V, and the car voltage is divided into 12V and 24V. When the car walkie-talkie works on a car with a voltage of 24V, it is necessary to install a transformer between the car and the walkie-talkie. The transmitting power of the car walkie-talkie is 25-50W, with high power and long signal transmission distance. Car walkie-talkie can only be fixed in one place, which is not as convenient to use as hand-held walkie-talkie. Car walkie-talkies are generally used in motorcades.