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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. 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 ...

  4. 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 ...

  5. List of software-defined radios - Wikipedia

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

    Four dual channel, 16 bit, 370 MSPS ADCs; Two quad channel, 16 bit, 2500 MSPS DACs; 4/4 2x 10Gbit/s SFP+, Ethernet Yes Yes Yes Cross Country Wireless SDR receiver v. 3 [34] Pre-built 472 – 479 kHz, 7.0–7.3 MHz/10.10–10.15 MHz, and 14.00–14.35 MHz ext No External ADC required (I/Q output) 1/1 Crystal controlled two channels Yes 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. Astro (Motorola) - Wikipedia

    en.wikipedia.org/wiki/Astro_(Motorola)

    The Original ASTRO 25 format utilizes APCO Project 25 Phase I technology (FDMA). It is the most used format of the ASTRO 25 family of radio systems. The ASTRO 25 Phase II system, which complies with the P25 Phase II standard, uses TDMA technology to deliver two voice channels over a single wireless trunking channel. [4]