According to different frequencies and applications, walkie-talkie can be divided into several types.
1. Professional walkie-talkie
Professional two way radio refers to walkie-talkie whose transmit power is 4 to 5W and the frequency range is 136 to 174MHz or 400 to 480MHz. Generally, the communication distance of this two way radio is from 3 to 8km (depending on the specific circumstances). The operation is quite easy, for there are no keyboard only two knobs to control channel and volume. The profession walkie-talkie has more stable performance on water proof, anti- vibration and anti-aging, however, the heavy weight and large bulk are major shortcomings. The price is also more expensive, usually between 500-2500 RMB and has widely applied in construction sites, property management workshops, and factories.
2. Commercial walkie-talkie
The transmit power of commercial walkie-talkie is 0.5 to 4W, the frequency range is 400-480MHz, and the communication distance is 800meters to 8km (the distance may vary according to transmit power and specific circumstances). The commercial two way radio has beautiful appearance, and can be clipped on the belt, just use earphones rather hands, therefore can improve the working efficiency. The price is nearly the same as professional ones and widely used in department stores, supermarkets and manufacturing factories.
The transmit power of civilian two way radio is between 0.5 to 1W, the frequency range is within 409MHz. The communication distance is shorter about 3 km in open area and can be used without a license. The civilian walkie-talkie is light and colorful; the price is also cheap, commonly in 300 to 600 RMB, particularly suitable for business trip, tourism, restaurant and hotels etc.
4. Amateur walkie-talkie
Amateur two way radio is designed and produced to meet needs of walkie-talkie enthusiast, and the device can be called as playing machine. In order to cater the enthusiasts, many countries have set up particular frequency band for them. In China, the band is 144 to 146MHZ and 430 to 440MHZ which is universal around the world. The walkie-talkie enthusiasts just purchase the amateur two way radio based on their needs and after applying a license, they can talk with others freely.
There are large quantities of walkie-talkie but just a few kinds of explosion-proof two way radio. Currently, there are only MOTOROLA and other two manufacturers can produce the explosion-proof two way radio. This walkie-talkie can be used in explosive environments such as coal mines, petroleum gas companies, gas stations, chemical plants, flour plants, flax processing plants, coal plants and firefighting and so on.
6. Railways walkie-talkie
Undoubtedly, the railways walkie-talkie is customized to cater needs of railways offices. The transmit power is 4 to 5W, and the frequency range is selectable from 440 to 470MHz. The railways walkie-talkie generally has 2 to 4 function buttons and can shift the working modes for different environments, for instance, plains, tunnels and stations. The trains may produce a lot of noise, therefore has high demands on its audio output and through voice compandor, the tone quality can be more clear.
7. Police walkie-talkie
The police walkie-talkie is the public security police equipment, the frequency range is 350-370MHz and 370-390MHz. No one is allowed to steal or embezzle the resource of frequency range for police. The police walkie-talkie has more function and most of them are controlled by keyboard. Consumers should pay attention to the frequency range of two way radio in purchasing, so as to avoid unnecessary troubles.
8. Mobile radio
The operating voltage of mobile radio is 12.5V. The voltage of automobile is 12V and 24V, it’s necessary to install a transformer when the mobile radio in on the car of 24V voltage. Its transmit power is 25-50W, and has larger signal transmission distance. The mobile radio can only be fixed in one place, not as convenient as the handheld one and generally used in car teams.