Emerging Public Safety Wireless Communication Systems (Artech House Mobile Communications)

This is sometimes experienced when using a household speakerphone. Full duplex, on the other hand, allows two simultaneous conversations, similar to a classic argument between a coach and a sports official.

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Push-to-talk communications range from a simple pair of hand-held citizen band CB walkie-talkies to a new breed of enhanced, full-duplex cellular-like consumer products. Connection to the public switched telephone network PSTN by a two-way radio is usually done by incoming calls routed to a radio interface adapter.

During this process, a simplex SMR radio channel is connected to a two-way regular telephone transmission line. The wired portion of the call extends the effective distance of the radio communication link. Even though a two-way wired connection is made, the communication itself usually remains a half-duplex push-to-talk. LMR systems can share a single frequency or use dual frequencies. Where LMR systems use a single frequency when mobile radios must wait to talk, this is called a simplex system.

To simplify the mobile radio design and increase system efficiency, some LMR systems use two frequencies; one frequency is used for transmission and the frequency for reception.

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If the radio cannot transmit and receive at the same time, the system is called half duplex. When LMR systems use two frequencies and can transmit and receive at the same time, this is called full duplex.

When a company operates a LMR system to provide service to multiple users on a subscription basis typically to companies , it is called a public land mobile radio system PLMR. If the radio cannot transmit and receive at the same time, the system is called half duplex. When LMR systems use two frequencies and can transmit and receive at the same time, this is called full duplex. When a company operates a LMR system to provide service to multiple users on a subscription basis typically to companies , it is called a public land mobile radio system PLMR.

This figure shows a two-way radio system.

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The two-way portable radios can communicate with the base or they can communicate directly with each other. To transmit, the mobile radio user must push-to-talk.

Described are the basics of PLMR technologies including simplex, half-duplex, and full duplex operation. The different types of squelch systems are covered including carrier controlled squelch, tone controlled squelch, and digital squelch.

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