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  2. GE Marc V - Wikipedia

    en.wikipedia.org/wiki/GE_Marc_V

    There were two possible continuous tones: all radios on a single system used the same tone. These were used to distinguish between sites in the same way SAT tones were used on AMPS cellular systems. The first system in an area typically used the default tone of 3051.9 Hz, while 2918.7 Hz could be used for an additional system on the same ...

  3. Selective calling - Wikipedia

    en.wikipedia.org/wiki/Selective_calling

    In a conventional, analog two-way radio system, a standard radio has noise squelch or carrier squelch, which allows a radio to receive all transmissions. Selective calling is used to address a subset of all two-way radios on a single radio frequency channel. Where more than one user is on the same channel (co-channel users), selective calling ...

  4. Two-tone testing - Wikipedia

    en.wikipedia.org/wiki/Two-tone_testing

    Two-tone testing is a means of testing electronic components and systems, particularly radio systems, for intermodulation distortion. It consists of simultaneously injecting two sinusoidal signals of different frequencies (tones) into the component or system.

  5. Selcall - Wikipedia

    en.wikipedia.org/wiki/Selcall

    A typical tone period selection is 40ms, so for a 5-tone sequence this represents a total selcall duration of 5 x 40ms = 200ms. However this is vendor specific and for example commercial radios from Ericsson uses a tone period selection of 100ms where the first tone is 700ms. The 700ms is used on the first tone and allows radios to run a tone ...

  6. CCIR (selcall) - Wikipedia

    en.wikipedia.org/wiki/CCIR_(selcall)

    CCIR (Consultative Committee on International Radio) functions have largely been taken over by ITU-R. One common type of CCIR selcall used in VHF and UHF FM two-way radio communications, is a 5-tone selective calling system mainly found in some European countries and used by the Swedish Police and the Turkish Police.

  7. The commonly used keypad has four rows and three columns, but a fourth column is present for some applications. Pressing a key sends a combination of the row and column frequencies. For example, the 1 key produces a superimposition of a 697 Hz low tone and a 1209 Hz high tone. Initial pushbutton designs employed levers, enabling each button to ...

  8. Tone remote - Wikipedia

    en.wikipedia.org/wiki/Tone_remote

    A Tone remote, also known as an EIA Tone remote, is a signaling system used to operate a two-way radio base station by some form of remote control. [1] [2] [3] A tone remote may be a stand-alone desktop device in a telephone housing with a speaker where the dial would have been located. It may look like a desk top base station.

  9. SINCGARS - Wikipedia

    en.wikipedia.org/wiki/SINCGARS

    Single Channel Ground and Airborne Radio System (SINCGARS) is a very high frequency combat network radio (CNR) used by U.S. and allied military forces. In the CNR network, the SINCGARS’ primary role is voice transmission between surface and airborne command and control (C2) assets.

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