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- Selective_calling abstract "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 can address a subset of all receivers or can direct a call to a single radio. Selective calling features fit into two major categories: individual calling and group calling. Individual calls generally have longer time-constants: it takes more air-time to call an individual radio unit than to call a large group of radios.Selective calling is akin to the use of a lock on a door. A radio with carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct 'key', in this case a specific digital code. Selective calling systems can overlap; a radio may have (group call) and DTMF individual calling.Selective calling prevents the user from hearing others on a shared channel. It does not eliminate interference from co-channel users (other users on the same radio channel). If two users try to talk at the same time, the signal will be affected by the other party using the channel.Some selective calling systems experience falsing. In other words, the decoder activates when a valid signal is not present. Falsing may come from a maintenance problem or poor engineering.".
- Selective_calling wikiPageID "7342571".
- Selective_calling wikiPageRevisionID "605236703".
- Selective_calling description "Example of DTMF used as push-to-talk ID on a two-way radio system.".
- Selective_calling description "Example of a CCIR-format call.".
- Selective_calling description "Example of pick up and delivery truck radio traffic using Modat unit ID.".
- Selective_calling description "Single tone or tone burst selective calling audio example.".
- Selective_calling description "Sound of a two-tone sequential dial up paging terminal.".
- Selective_calling description "Two Quik Call I sequences.".
- Selective_calling description "leading push-to-talk ID with data muting.".
- Selective_calling description "leading push-to-talk ID without data muting.".
- Selective_calling filename "CCIR 04221.ogg".
- Selective_calling filename "CEGL DKNP Z.ogg".
- Selective_calling filename "DTMF trucking push to talk ID example.ogg".
- Selective_calling filename "Modat trucking example with ID 6988103.ogg".
- Selective_calling filename "Simulated two tone sequential code 415.ogg".
- Selective_calling filename "TRucking leading PTT ID MDC1200 non-Motorola recvr.ogg".
- Selective_calling filename "Trucking tone burst.ogg".
- Selective_calling filename "Trucking w leading PTT ID using MDC1200.ogg".
- Selective_calling hasPhotoCollection Selective_calling.
- Selective_calling title "DTMF P-T-T ID".
- Selective_calling title "MDC-1200 sounds".
- Selective_calling title "MODAT push-to-talk ID".
- Selective_calling title "Quik Call I".
- Selective_calling title "SelCall".
- Selective_calling title "Tone and voice paging example".
- Selective_calling title "Tone burst sound".
- Selective_calling subject Category:Radio_technology.
- Selective_calling comment "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 can address a subset of all receivers or can direct a call to a single radio.".
- Selective_calling label "Selective calling".
- Selective_calling sameAs m.025zqcb.
- Selective_calling sameAs Q7447757.
- Selective_calling sameAs Q7447757.
- Selective_calling wasDerivedFrom Selective_calling?oldid=605236703.
- Selective_calling isPrimaryTopicOf Selective_calling.