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  2. Continuous Tone-Coded Squelch System - Wikipedia

    en.wikipedia.org/wiki/Continuous_Tone-Coded...

    Because period is the inverse of frequency, lower tone frequencies can take longer to decode (depends on the decoder design). Receivers in a system using 67.0 Hz can take noticeably longer to decode than ones using 203.5 Hz, and they can take longer than one decoding 250.3 Hz. In some repeater systems, the time lag can be significant. The lower ...

  3. Freenet (radio) - Wikipedia

    en.wikipedia.org/wiki/Freenet_(radio)

    The original frequency allocation for Freenet encompassed three channels, each with a 12.5 kHz spacing. In January 2007, three additional channels were added, bringing the total up to six. The ordinance only permits handheld transceivers which must not permit an effective radiated power (ERP) of 1 W.

  4. Selective calling - Wikipedia

    en.wikipedia.org/wiki/Selective_calling

    The default or standard five Motorola tones used for single tone format as of the 1980s: 1,350 Hz, 1,500 Hz, 1,650 Hz, 1,800 Hz, 1,950 Hz. These were identified in system documentation for a number of remote control equipment models as well as sales brochures for Motorola Syntor and Micor mobile radio Systems 90 accessories. A common tone burst ...

  5. C-QUAM - Wikipedia

    en.wikipedia.org/wiki/C-QUAM

    C-QUAM (Compatible QUadrature Amplitude Modulation) is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert, and Yoshio Sakaie, and published in an IEEE journal.

  6. MDC-1200 - Wikipedia

    en.wikipedia.org/wiki/MDC-1200

    MDC (Motorola Data Communications), also known as Stat-Alert, MDC-1200 and MDC-600, is a Motorola two-way radio low-speed data system using audio frequency shift keying, (AFSK). MDC-600 uses a 600 baud data rate. MDC-1200 uses a 1,200 baud data rate. Systems employ either one of the two baud rates.

  7. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz).Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.

  8. Motorola Type II - Wikipedia

    en.wikipedia.org/wiki/Motorola_Type_II

    When scanning Motorola IDs, each Type II user ID appears as an even 4- or 5-digit number without a dash (example 2160). With the introduction of Type II, the "System ID" was also introduced. This is a four digit identifier unique to each trunking system.

  9. Family Radio Service - Wikipedia

    en.wikipedia.org/wiki/Family_Radio_Service

    Motorola T5320 FRS handheld radio. The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.

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