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What is PMRTS?
Public Mobile Radio Trunking Service (PMRTS) is an instant, two-way mobile (radio) communication service that allows a group of people to communicate with each other, even if some or all of them are on the move. When radio channels are trunked, it means that your radios automatically get a free 'path', at the press of a button, to communicate with each other.

What are the types of Radios / Walky Talkies available?
The Walky Talkies can be divided into 3 broad categories:

• Fixed Walkies
  Walkies positioned at a central site like an office or headquarters where dispatcher / manager can maintain contact with field staff. The equipment at such a site is referred to at the base station.
• Mobile Walkies
  Walkies installed in vehicles are referred to as Mobile Walkies.
• Portable Walkies
  Walkies small enough to be carried around in hand are referred to as Portable Walkies.

How does PMRTS differ from Conventional (VHF) Radios?
Conventional system is the foundation of two way radios. However, as the number of users grow, frequency congestion occurs since there are only a finite number of frequencies. The trunking system was then developed to more efficiently meet the communication needs of a large amount of users by sharing a small number of frequencies. Hence PMRTS is defined as the sharing of radio channels amongst a number of different user groups on the same system without over hearing or interfering with each other's conversations. Thus the basic advantages of PMRTS against conventional radios are as follows:

• Shares equipment such as repeaters in a more effective and cost efficient manner
• Increases probability of obtaining free channels, less waiting time and improved productivity
• Improves privacy of communication
• Efficient use of spectrum
• Eliminates the need to monitor channel before transmitting