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  2. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

  3. Comparison of radio systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_radio_systems

    World radio systems (Terrestrial) System Type Modulation Data rate Sidebands? Ch. Bandwidth Radio spectrum Sound Codec Digital subchannels SFN Metadata/RDS/RBDS; AM radio: Analog radio: Amplitude Modulation: N/A? 18–20 kHz: 148.5-283.5 kHz (Longwave) 510–1610 kHz (Europe) 510–1710 kHz (USA and Canada) N/A: N/A: No: None Motorola C-QUAM ...

  4. NXDN - Wikipedia

    en.wikipedia.org/wiki/NXDN

    The basic NXDN channel is digital and can be either 12.5 kHz or 6.25 kHz wide. 6.25 kHz dual-channel systems can be configured to fit within a 12.5 kHz channel. This effectively doubles the spectrum efficiency compared to an analog FM system occupying a 12.5 kHz channel. The architecture of NXDN is such that two NXDN channels, within a 12.5 kHz ...

  5. List of software-defined radios - Wikipedia

    en.wikipedia.org/.../List_of_software-defined_radios

    Crystal controlled two channels Yes Yes Yes Cyan [33] Pre-built 100 kHz – 18 GHz 1 – 3 GHz (8 fully independent Rx chains and 8 fully independent Tx chains, each capable of up to 1 GHz of RF bandwidth) 16 16 Yes 1–3 GSPS ADCs; 2.5 GSPS DACs; 1 – 16 receive and 1 – 16 transmit (total of 16 radio chains) 4x 40Gbit/s QSFP, Ethernet Yes Yes

  6. Trunked radio system - Wikipedia

    en.wikipedia.org/wiki/Trunked_radio_system

    A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup ) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...

  7. Project 25 - Wikipedia

    en.wikipedia.org/wiki/Project_25

    Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]