Ключевые слова: antenna, background, bandwidth, black, call, communicate, communication, community, construction, conversation, device, engineer, equipment, frequency, guard, handheld, industry, information, keyboard, mobile, mobility, modulation, occupation, officer, phone, police, portable, radio, receive, receiver, receiving, repeater, safety, secret, security, serious, service, signal, system, talkie, talky, technology, telephone, transceiver, transmit, transmitter, urgency, voice, walkie, walkietalkie,