| Message: | Type From The Use Of The Way, Divided Into Handheld,Air,Boat, Machine,Loaded,Fixed,Relay.
Handheld wireless walkie-talkie
This is a small, light weight, low power wireless walkie-talkie, suitable for hand or bag, easy to carry personal, can communicate in the communication, the general power VHF band does not exceed 5W, UHF band no more than 4W The The communication distance is generally 5 km in barrierless open areas. The machine is suitable for close communication between the various types of mobile personnel. In the series of wireless telephones, handheld radio "walkie-talkie" the number and variety of applications is the most, accounting for more than 80%.
Car (boat, machine) loaded wireless walkie-talkie
This is a wireless walkie-talkie that can be installed on a vehicle, ship, airplane and other vehicle directly powered by a vehicle and used to use the car on the antenna. It is mainly used for transportation, production scheduling, security command And other business. Its larger, the power of not less than 10W, usually 25W. The maximum power for the VHF is 56W, UHF is 50W, communication distance can reach more than 20 kilometers.
Relay station
The relay station is to receive a certain band of the signal directly through its own transmitter in other frequencies forwarded out. The two groups of different frequency signals do not affect each other, or can allow two groups of users at different frequencies on the communication link. It has the ability to send and receive at the same time and do not interfere with the characteristics of full-duplex work.
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