two way radio calls

two way radio calls are instantaneous, push-to-talk (PTT) voice transmissions between handheld, mobile, or base stations, allowing users to send and receive messages on shared frequencies. Operating via UHF/VHF, they offer direct, reliable, and durable communication, commonly using analog or digital signals for quick, coordinated group interaction. 
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Key Characteristics of Two Way Radio Calls

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• Push to talk (PTT): The user presses a button to transmit and releases it to listen, making it faster than dialing a phone.

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•  Half- Duplex Communication : Only one person can talk at a time, requiring users to take turns on a channel.

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• Group Communication :  Multiple users on the same channel can hear the communication, facilitating group coordination.

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• Direct or System- Based ; Calls can be unit-to-unit (radio to radio) or routed through a repeater for extended range.

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• Durability and Reliability : Ideal for rugged environments like construction, security, or outdoor activities where cellular coverage is poor. 

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Types of Radio Calls

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• Individual Call: A private, one-on-one call between two users.

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• Group Call :  A call sent to a specific, predefined group of users, commonly used in business or emergency services.

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• All Call:  A broadcast to every radio within range or on the system.

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• Emergency Call:  High-priority calls often with pre-emptive access to the channel. 

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Common Radio Terminology (Etiquette)

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• ” Over” – I have finished speaking and am waiting for a response.

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•  “Roger/ Roger That’ – Message received and understood.

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•  “Wilco” – Abbreviation for “will comply,” meaning the message is understood and will be acted upon.

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•  ‘ Stand B’ – I am busy, but will get back to you shortly.

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•  “Break, Breal” – Used to interrupt a conversation for an urgent, non-emergency message.

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• “Copy” – I understand.

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•  “What’s your 20?” – A common, though less formal, phrase for “What is your location?”. 

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Basic Operation

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1.  Check the channel : Ensure the channel is clear to avoid interrupting existing conversations.

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2. Push to talk : Press the PTT button, wait a second for the transmission to connect.

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3. Speak Clearly: Speak directly into the microphone at a normal volume.

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4. Release to listen : Release the button immediately when finished to hear the reply. 

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